JP2002032048A - Picture display device and electronic apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make satisfactory picture display and the property of low power consumption coexist with each other in a picture display device. SOLUTION: This picture display device is provided with data signal line driving circuit SD1, SD2 and scanning signal line driving circuit GD1, GD2 having plural different constructions. Respective data signal line driving circuits or scanning signal line driving circuits have different displayable formats. The display in a suitable display format becomes possible by changing over driving circuits to be operated in accordance with the kind of a video signal to be inputted and use environment and, also, the reducing of power consumption of the device is realized too. Furthermore, since the overwriting of a picture becomes possible by writing video signals on a signal line with a time lag while using plural driving circuits, super impose display is made possible without performing the signal processing of the video signal at the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image display device provided with a drive circuit such as a data signal line drive circuit or a scan signal line drive circuit, and an electronic apparatus using the same.

[0002]

2. Description of the Related Art As an example of an image display device which is the subject technology of the present invention, an active matrix type liquid crystal display device will be described here. However, the present invention is not limited to this, and is effective for other image display devices.

As one of the conventional image display devices, a liquid crystal display device of an active matrix drive system is known. As shown in FIG. 93, the liquid crystal display device includes a pixel array, a scanning signal line driving circuit GD, and a data signal line driving circuit SD. In the pixel array, a number of scanning signal lines GL and a number of data signal lines SL crossing each other are provided.
And a pixel PIX surrounded by two adjacent scanning signal lines GL and two adjacent data signal lines SL.
Are provided in a matrix. The data signal line drive circuit SD samples the input video signal DAT in synchronization with a timing signal such as a clock signal SCK,
It functions to amplify and write to each data signal line SL as required. The scanning signal line driving circuit GD synchronizes with the timing signal such as the clock signal GCK, etc.
Are sequentially selected, and the video signal (data) written to each data signal line SL is written to each pixel PIX by controlling the opening / closing of the switching element in the pixel PIX, and the data written to each pixel PIX. It works to keep.

Each pixel PIX in FIG. 93 has, as shown in FIG. 94, a field-effect transistor SW as a switching element and a pixel capacitance (consisting of a liquid crystal capacitance CL and an auxiliary capacitance CS added as necessary). Be composed. In FIG. 94, a data signal line SL is connected to one electrode of a pixel capacitor through a drain and a source of a transistor SW serving as a switching element, a gate of the transistor SW is connected to a scanning signal line GL, and the other of the pixel capacitor is connected. Are connected to a common electrode line common to all pixels. Then, the transmittance or reflectance of the liquid crystal is modulated by the voltage applied to each liquid crystal capacitor CL, and the modulated liquid crystal is used for display.

Next, a method of writing video data to a data signal line will be described. As a driving method of the data signal line, there are an analog method and a digital method. Among the analog systems, there are a dot sequential driving system and a line sequential driving system. Further, among digital systems, there are those having an amplifier and those not having an amplifier.

FIG. 95 shows an example of a data signal line drive circuit of a dot sequential system. In the point-sequential driving method, as shown in FIG. 95, a video signal input to a video signal line DAT is converted into output pulses N (that is, N1, N2,...) Of each latch stage of a shift register including a plurality of latch circuits FF. ) Is written to the data signal line SL by opening and closing the analog switch AS as a sampling circuit in synchronization with the above. Here, in the configuration of FIG. 95, two adjacent latch circuits F
The sampling signals S and / S are generated from the overlapping pulses of the output signal N of F, and the video signal DAT at the falling (end) timing of the sampling signal is written to the data signal line SL.

FIG. 96 shows another example of the data signal line drive circuit of the dot sequential system. In FIG. 96, three video signals corresponding to the three primary colors (R, G, B) of the display are input to the drive circuit, and the same pulse signals S1, / S1,. . Are output to different data signal lines SL1r, SL1g, SL1b,...

FIG. 97 shows an example of a line-sequential data signal line drive circuit. In the line sequential driving method, as shown in FIG. 97, a video signal input to a video signal line DAT is synchronized with an output pulse N of each latch stage of a shift register including a plurality of latch circuits FF, and a sampling circuit AS is driven. After capturing by opening and closing, signals for one horizontal period are simultaneously transferred to the next stage and written to the data signal line SL via the amplifier AM.

FIG. 98 shows an example of a digital data signal line driving circuit without an amplifier. In this method, a digital signal input to a digital video signal line DIG is synchronized with an output pulse N of each latch stage of a shift register including a plurality of latch circuits FF, and the latch circuit L
After receiving the signal in T, the signal for one horizontal period is simultaneously transferred to the next stage, converted into an analog signal by the digital-analog conversion circuit DA, and written to the data signal line SL.

FIG. 99 shows an example of a digital data signal line driving circuit having an amplifier. In this system, a digital signal input to a digital video signal line DIG is synchronized with an output pulse N of each latch stage of a shift register including a plurality of latch circuits FF, and the latch circuit LT
After that, the signals for one horizontal period are simultaneously transferred to the next stage, converted into analog signals by the digital-analog conversion circuit DA, further amplified by the amplifier AP, and written to the data signal line SL.

FIG. 100 shows an example of a scanning signal line driving circuit. As shown in FIG. 100, in the scanning signal line driving circuit, a product (A) of a pulse signal sequentially transferred in synchronization with a clock signal GCK and a signal GEN defining a pulse width is used.
ND) signal as a scanning signal and outputs it to the scanning signal line GL. As described above, the writing and holding of the video signal to the pixel are controlled by the scanning signal.

FIG. 101 is a timing chart corresponding to the configuration of FIG.

Meanwhile, in recent years, in order to reduce the size, increase the resolution, and reduce the mounting cost of a liquid crystal display device, a technique of integrally forming a pixel array for controlling display and a drive circuit on the same substrate has attracted attention. ing. This is shown in FIG. In the figure, SUB is a substrate, and COM is a common terminal. In such a liquid crystal display device integrated with a drive circuit, it is necessary to use a transparent substrate for the substrate (in the case of forming a transmission type liquid crystal display device that is widely used at present), so that the liquid crystal display device is formed on a quartz substrate or a glass substrate. In many cases, a polycrystalline silicon thin film transistor that can be used is used as an active element.

[0014]

By the way, in a conventional image display device, as shown in FIG. 93, it is general that a data signal line driving circuit and a scanning signal line driving circuit are arranged one by one. is there.

Therefore, the format of the video to be displayed is often limited to one type. There are image display devices that can display images in a plurality of formats, but these are simply converting signals (control signals and video signals) input to the display device by an external circuit, and driving the display device itself. Are almost the same. That is, the same circuit (the data signal line driving circuit and the scanning signal line driving circuit) operates even when displaying an image of any format, so that power consumption hardly changes.

In recent years, with the demand for longer usable time of portable devices, there has been an increasing demand for lower power consumption of display devices. Here, the portable device is not always in a use state, and most of the time is in a standby state. Also, the displayed video and format are often different between use and standby. For example, at the time of standby, a menu screen, time, and the like need only be displayed, and the definition and the number of display colors may be low. Rather, it is important to extend the use time by reducing power consumption. On the other hand, when used, a large number of images such as documents, figures, and photographs are often displayed, and high-quality display is required. At this time, power consumption in other parts of the mobile device (for example, a communication module, an input interface unit, and an arithmetic processing unit) increases,
The ratio of power consumption in the display module decreases. Therefore, the demand for lower power consumption during use is generally not as strong as during standby.

In the conventional configuration having only one drive circuit, when a plurality of image data are to be superimposedly displayed on the image display device, it is necessary to input the image data to the image display device as previously synthesized image data. is there. Therefore, it is necessary to provide an external image processing circuit for synthesizing a plurality of images.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an image display device which can be driven in accordance with the respective requirements during use and standby, and an electronic apparatus using the same. To provide. Another object of the present invention is to provide an image display device capable of displaying a plurality of image data in a superimposed manner without combining them in advance, and an electronic device using the same.

[0019]

In order to solve the above-mentioned problems, an image display device according to the present invention comprises a pixel array comprising a plurality of pixels for displaying an image, and a data signal line for supplying a video signal to the pixel array. A driving circuit; a scanning signal line driving circuit for controlling writing of a video signal to the pixel; a data signal line driving circuit; a timing circuit for supplying a timing signal to the scanning signal line driving circuit; An image display device having a video signal processing circuit for supplying a video signal to a circuit, wherein at least one of the data signal line driving circuit and the scanning signal line driving circuit includes a plurality of driving circuits. Prepared,
The driving circuits take different display forms from each other.

By providing a plurality of data signal line drive circuits having different configurations, images can be displayed in different display formats. That is, a data signal line driving circuit suitable for a plurality of display formats is provided in advance, and the data signal line driving circuit to be operated is selected according to the user's request, the type of input signal, and the surrounding environment. Thus, video display in a format suitable for the purpose becomes possible.

Further, by providing a plurality of data signal line drive circuits and writing image data from each data signal line drive circuit to the pixel array, a plurality of images can be displayed in a superimposed manner.

By providing a plurality of scanning signal line driving circuits having different configurations, images can be displayed in different display formats. That is, a scanning signal line driving circuit suitable for a plurality of display formats is provided in advance, and in response to user requests, input signal types, and surrounding environments,
By selecting the scanning signal line driving circuit to be operated, it is possible to display an image in a format suitable for the purpose.

Further, in the image display device of the present invention, in the above-mentioned image display device, only one of the drive circuits, at least a part of which is provided, operates at each time. It is characterized by having.

When image data is written from any one of the plurality of data signal line driving circuits to the pixel array in order to display an image in a certain format, the other data signal line driving circuits are used for display. Irrelevant. In that case, power consumption can be reduced by stopping the operation of the data signal line driving circuits.

When one of a plurality of scanning signal line driving circuits is driven to write image data to a pixel array in order to display an image of a certain format,
Other scanning signal line driving circuits are irrelevant to display. In that case, power consumption can be reduced by stopping the operation of the scanning signal line driving circuits.

The image display device according to the present invention is characterized in that, in the image display device described above, the same drive circuit is driven at least in the same frame period, for the drive circuit provided at least in part. I have.

By driving the same data signal line driving circuit during the same frame period,
An image can be displayed in an optimal format according to the type of the image, and both high image quality and low power consumption can be realized.

By driving the same scanning signal line driving circuit during the same frame period, it is possible to display an image in an optimal format according to the type of the image for each frame, thereby achieving high image quality and low power consumption. Gender compatibility can be realized.

Further, the image display device of the present invention is characterized in that, in the above-mentioned image display device, the drive circuit to be driven is switched within the same frame period for the drive circuit of which at least a part is provided in plurality.

By switching the data signal line driving circuits to be driven within the frame period, even when displaying different types of images in one screen, an image can be displayed in an optimal format in each area within the screen. This makes it possible to achieve both high image quality and low power consumption.

By switching the scanning signal line driving circuits to be driven within the frame period, even when different types of images are displayed in one screen, the image display in the optimum format can be performed in each area in the screen. This makes it possible to achieve both high image quality and low power consumption. Switching of the scanning signal line driving circuit to be driven within the frame period can be realized by limiting the output by an enable signal or by inputting a start signal in the middle.

Further, in the image display device according to the present invention, in the above-mentioned image display device, at least two of the driving circuits are provided with image data in different areas on the screen. Is written.

Even when a plurality of data signal line driving circuits display different types of images in one screen by writing image data in different areas in the screen, the data signal line driving circuits are optimal in each area in the screen. It is possible to display images in various formats, and it is possible to achieve both high image quality and low power consumption.

A plurality of scanning signal line driving circuits write image data to different areas in the screen,
Even when different types of images are displayed on one screen, images can be displayed in an optimal format in each area of the screen, and both high image quality and low power consumption can be realized.

Further, the image display device according to the present invention, in the above-mentioned image display device, comprises at least a part of the data signal line drive circuit, and at least two of the data signal line drive circuits are provided within the same frame period. The image data is written in at least a part of the same area in the screen.

A plurality of data signal line drive circuits write image data in the same area of the screen within the same frame period, thereby realizing image overwriting (superimposition). That is, after writing certain image data, it is possible to overwrite the same display area with another image data without using an external image processing circuit. This makes it possible to simplify the system, reduce costs, and reduce power consumption.

The image display device according to the present invention is characterized in that, in the image display device, at least two of the plurality of data signal line drive circuits operate simultaneously.

By operating a plurality of data signal line driving circuits simultaneously, image data from any of the data signal line driving circuits can be displayed, and image display of different formats can be realized within one screen. , Image overwriting can be realized.

According to the image display device of the present invention, in the image display device, at least one of the plurality of data signal line drive circuits is written by another data signal line drive circuit within the same frame period. It is characterized in that image data is written over an image.

By overwriting an image written by a certain data signal line driving circuit with another data signal line driving circuit and writing the image data, image synthesis can be realized without an external image processing circuit. It is possible to do. This makes it possible to simplify the system, reduce costs, and reduce power consumption.

The image display device according to the present invention is characterized in that, in the image display device, at least one of the plurality of data signal line drive circuits overwrites an image in units of a horizontal scanning period.

By overwriting the image in units of the horizontal scanning period, the driving of the data signal line driving circuit that controls the overwriting can be simplified. That is, the data signal line drive circuit is driven only during the display period corresponding to the line to be overwritten,
In a display period corresponding to another line, the data signal line driving circuit may not be driven.

Further, in the image display device according to the present invention, in the image display device, at least one of the plurality of data signal line driving circuits overwrites an image only in a part of each horizontal scanning period. It is characterized by:

By overwriting the image only in a part of the horizontal scanning period, the overwriting is performed only on the white (or black) portion of the character, and the gap is not overwritten. Can be superimposed on characters.

Further, the image display device of the present invention, in the above-mentioned image display device, includes at least a part of the data signal line drive circuit, and at least one of the plurality of data signal line drive circuits is provided for each horizontal scanning. It is characterized in that image data is written during a retrace period of a period.

Since the retrace period of the horizontal scanning period is temporally later than the normal writing period, the data signal line driving circuit writes image data during the retrace period of each horizontal scanning period, thereby Even when image data has already been written to the data signal line corresponding to the display area, the image data can be overwritten without any problem.

Further, the image display device according to the present invention, in the above-mentioned image display device, includes at least a part of the data signal line drive circuit, and at least one of the plurality of data signal line drive circuits includes another data signal line drive circuit. It is characterized in that image data is written after a certain period of time behind the signal line driving circuit.

When a certain data signal line driving circuit writes image data after a certain period of time behind another data signal line driving circuit, a case where image data has already been written to a data signal line corresponding to the display area is obtained. Image data can be overwritten without any problem.

Further, according to the image display device of the present invention, in the above-described image display device, the drive circuit, at least a part of which is provided, is arranged on the opposite side to the pixel array. It is characterized by:

Generally, the data signal line drive circuit is arranged on one side of the pixel array (screen area), and the drive circuit and the like are not arranged on the opposite side in many cases.

As described above, when a plurality of data signal line driving circuits are provided, by arranging them on both sides of the pixel array, this space can be effectively used.

In general, the scanning signal line driving circuit is arranged on one side of the pixel array (screen area), and the driving circuit and the like are often not arranged on the opposite sides.

As described above, when a plurality of scanning signal line driving circuits are provided, by arranging them on both sides of the pixel array, this space can be used effectively.

Further, when a plurality of drive circuits having different configurations are arranged on the same side, wiring routing (output lines from one drive circuit pass through a gap between the other drive circuits) becomes complicated. This causes an increase in the layout area and noise generation / malfunction due to interference between signal lines. On the other hand, if a plurality of drive circuits are arranged separately, such a case does not occur.

Further, in the image display device of the present invention, in the above-mentioned image display device, the drive circuit having at least a part thereof is arranged on the same side with respect to the pixel array. It is characterized by.

By arranging a plurality of data signal line driving circuits on the same side with respect to the pixel array (screen area), signal wirings can be integrated, so that the overall size can be reduced. There are cases.

Further, since the signal input terminal and the power supply terminal can be brought close to any of the drive circuits, it is possible to avoid signal delay and waveform distortion due to long-distance wiring.

By arranging a plurality of scanning signal line driving circuits on the same side with respect to the pixel array (screen area), signal wirings can be integrated, so that the overall size can be reduced. There are cases.

Further, since the signal input terminal and the power supply terminal can be brought close to any of the driving circuits, it is possible to avoid signal delay and waveform distortion due to long-distance wiring.

The image display device according to the present invention is characterized in that, in the above-described image display device, at least a part of the plurality of drive circuits, each of which has a common circuit. Features.

Even when a plurality of configurations include different data signal line driving circuits, some of them may adopt the same circuit configuration. For example, when the resolution of a display image does not change, the operation of a scanning circuit (shift register circuit) that sequentially transfers signals is the same. Therefore, in such a case, the circuit scale can be reduced by sharing a part of the circuits with a plurality of drive circuits.

Even when a plurality of configurations include different scanning signal line driving circuits, some of them may adopt the same circuit configuration. For example, when the resolution of a display image does not change, the operation of a scanning circuit (shift register circuit) that sequentially transfers signals is the same. Therefore, in such a case, the circuit scale can be reduced by sharing a part of the circuits with a plurality of drive circuits.

In the image display device of the present invention, in the above-described image display device, which of the drive circuits, at least a part of which is provided, is determined by which of the drive circuits is driven by an externally input signal. It is characterized by controlling.

Even when a plurality of data signal line driving circuits are provided as described above, only one data signal line driving circuit actually drives the pixel array. It is wasteful to drive a data signal line driving circuit that does not contribute to display. Therefore, it is effective from the viewpoint of power consumption to control an external signal so that only the data signal line driving circuit that controls display operates.

Even when a plurality of scanning signal line driving circuits are provided as described above, only one scanning signal line driving circuit actually drives the pixel array. It is useless to drive a scanning signal line driving circuit that does not contribute to display. Therefore, it is effective from the viewpoint of power consumption to control an external signal so that only the scanning signal line driving circuit that controls display operates.

Further, the image display device of the present invention is characterized in that, in the above-mentioned image display device, one of the above-mentioned different display modes is selected according to the type of input display data.

The types of images displayed by the image display device are various and include, for example, character text, figures, tables / graphs,
There are various types such as photos and videos. The resolution (definition) of the original signal also varies. For these, it is not necessary to display images in the same display mode and display format. For example, when only character text is displayed, halftone display is not required and binary display may be sufficient. On the other hand, when displaying an image such as a photograph, it is necessary to realize high resolution and halftone display with multiple gradations (64 to 256 gradations). Also, for photos and the like where clearer display is desired, select the transmissive display mode, and for character texts etc. that can be achieved if they can be read, the contrast ratio is small but low power consumption. It is desirable that the display mode can also be switched, for example, by selecting a reflective display mode in which the display mode is improved.

Therefore, by providing a plurality of drive circuits and changing the display mode and display format according to the type of video to be displayed, a display optimized for input display data (the type of image to be displayed) is provided. And drive becomes possible.

The image display device according to the present invention is characterized in that, in the above-mentioned image display device, any one of the above-mentioned different display modes is selected according to the use environment.

Generally, in the transmissive display mode, a clearer display is obtained by the effect of the backlight in a dark environment, and the visibility is greatly deteriorated by the reflected light under strong external light. On the other hand, in the reflective display mode, it becomes more visible under strong external light conditions, and becomes less visible under dark surroundings. Further, for example, in the reflective display mode, since the contrast ratio is small, it is meaningless to increase the number of display gradations more than necessary. Therefore, it is desirable to select the most suitable display format according to the display mode. As described above, the display mode is switched according to the environment such as the surrounding brightness, and the display format is switched according to the display mode, thereby achieving both the visibility of the image and the low power consumption. It becomes possible.

In the image display device according to the present invention, in the image display device, the video signal processing circuit converts the input video signal into a plurality of types of display formats having different display forms. It is characterized by:

As described above, there are various types of video data input to the image display device, but the format of the input signal may be the same. In that case, it is necessary to convert the video data into a format corresponding to the type of video and supply it to the data signal line drive circuit. This is realized by providing a signal processing circuit having a format conversion function. That is, it can correspond to various types of video data input to the image display device.

Further, in the image display device according to the present invention, in the image display device, the timing circuit converts the input timing signal into a signal corresponding to a display format as a display format different from each other. Features.

In the case of changing the display resolution and the frame frequency depending on the type of video and the surrounding environment, it is necessary to change the timing signal (such as a clock signal) supplied to the data signal line driving circuit and the scanning signal line driving circuit. is there.
This is realized by providing a timing circuit having a function of converting an original timing signal such as a synchronization signal or an original clock signal into a plurality of types of timing signals corresponding to a display format. That is, it is possible to satisfactorily cope with a case where the display is changed and the display frequency or the frame frequency is changed depending on the type of the image or the surrounding environment.

Further, the image display device of the present invention, in the image display device, wherein the timing circuit includes timing signal supply destination switching means for receiving a control signal from the outside and switching a supply destination of the timing signal. It is characterized by.

In the above configuration, only one of the plurality of data signal line driving circuits or scanning signal line driving circuits operates. At that time, there is no need to supply a timing signal to the other inactive drive circuits.

Therefore, by providing a means for switching the supply destination of the timing signal and by stopping unnecessary supply of the timing signal, malfunctions due to noise and the like can be prevented and power consumption can be reduced.

The image display device according to the present invention, in the image display device, wherein the video signal processing circuit includes a video signal supply destination switching means for switching a video signal supply destination in response to an external control signal. It is characterized by doing.

In the above configuration, only one of the plurality of data signal line driving circuits operates. At that time, it is not necessary to supply the video signal to the other inactive drive circuits. Therefore, by providing a means for switching the supply destination of the video signal and by stopping unnecessary supply of the video signal, malfunction due to noise or the like can be prevented and power consumption can be reduced.

Further, the image display device of the present invention, in the above-mentioned image display device, comprises a detecting means for detecting a use environment, and a display form switching means for switching the display form based on a signal from the detecting means. It is characterized by:

As described above, when the display mode or the display format is switched according to the usage environment, the user may switch the display mode or the display format using a switch or the like. However, by providing an optical sensor, etc., it recognizes the usage environment,
It is possible to automatically select and switch the optimal display mode and display format. This eliminates the need for the user himself to control the device.

The image display device according to the present invention, in the above-mentioned image display device, comprises: a video type determining means for determining the type of an input video signal; and the display mode based on a signal from the video type determining means. And a display mode switching means for switching.

As described above, when switching the display mode or display format in accordance with the type of video to be displayed (photograph, graph, text, etc.), the user may switch using a switch or the like. However, by providing the means for determining the type and format of the video signal, it is possible to automatically switch the optimum display mode and display format corresponding to the type of video. This eliminates the need for the user himself to control the device.

The image display device according to the present invention is characterized in that, in the above-mentioned image display device, at least a part of the drive circuit is provided with independent power supply terminals and input terminals. And

As described above, when a plurality of drive circuits are provided, it is necessary to supply a timing signal, a video signal, and power to each drive circuit. At this time, in particular, when the driving circuits are arranged on both sides of the pixel array, by providing independent power supply terminals and input terminals, signal lines and power supply lines are less likely to intersect with each other. It is possible to suppress an operation failure, a display failure, and the like caused by such factors.

Further, in the image display device of the present invention, in the above-described image display device, at least a part of the drive circuit is provided, and the drive circuit has a part of a power supply terminal and a part of an input terminal. It is characterized by having.

When a plurality of data signal line driving circuits or scanning signal line driving circuits are provided, their driving methods are different, so that the timing signals, video signals and driving power may be different in each driving circuit. May be the same for the signals and the power supply. At this time, by sharing the same signal terminal and the same voltage power supply terminal, the number of terminals can be reduced, and external signal switching and power supply switching can be simplified.

Further, in the image display device of the present invention, in the above-mentioned image display device, a power supply is provided to at least one of the plurality of drive circuits which is not operating. It is characterized by stopping the supply of water.

In the above configuration, only one of the plurality of data signal line driving circuits or scanning signal line driving circuits operates. At that time, there is no need to supply power to the other inactive drive circuits. Therefore, a configuration is provided in which an independent power supply terminal is provided for each of the plurality of drive circuits, and power supply to power supply terminals corresponding to inactive drive circuits is stopped, thereby eliminating power consumption due to leak current or the like. It becomes possible.

Further, according to the image display device of the present invention, in the above-described image display device, the driving circuit, at least a part of which is provided, of the driving circuit which is not used for display and the pixel array are not used. A drive circuit separating means for electrically separating the drive circuit from the drive circuit.

In the case where a plurality of data signal line driving circuits or scanning signal line driving circuits capable of displaying the same pixel array are provided, when a signal (video signal or scanning signal) is simultaneously supplied from the plurality of driving circuits to the pixel array, There is a risk that signal interference will occur and normal display will not be performed. In addition, even when one of the driving circuits is not operating, if it is connected to a signal line, signal leakage may occur and display may be adversely affected.

Therefore, by providing a means for electrically separating the drive circuit which is not used for display from the pixel array, it is possible to obtain an image display device capable of excellent display.

Further, the image display device of the present invention is characterized in that, in the image display device, one of the plurality of display formats has a higher image quality than the other as a plurality of display formats as different display forms.

As described above, by mounting a plurality of data signal line driving circuits or scanning signal line driving circuits for one pixel array, a plurality of formats can be displayed. A display mode and a display format suitable for the type and the use environment can be selected.

At this time, a driving circuit for realizing high display quality (for example, high resolution, color display, multi-gradation, high frame frequency, transmissive display mode, etc.) and a display having relatively low quality (low Resolution, black-and-white display, low gradation, low frame frequency, reflective display mode, etc.), and the optimal display method and drive for the type of video and surrounding environment It is possible to select a method.

Further, the image display device of the present invention is characterized in that in the above-mentioned image display device, one of the plurality of display formats as the above-mentioned different display forms has lower power consumption than the other.

In general, in order to improve display quality, it is necessary to realize high resolution, color display, multi-gradation, high frame frequency, transmission type display mode, etc., as described above. Often increases. on the other hand,
When the display quality is reduced, such as in low resolution, black and white display, low gradation, low frame frequency, and reflective display mode, power consumption is reduced.

As described above, a display mode and a display format suitable for the type of display data and the use environment can be selected, and the optimum display method and drive method for the type of image and the surrounding environment can be selected. By choosing
It is possible to optimize power consumption.

The image display device of the present invention is characterized in that, in the image display device, one of the plurality of display formats has a higher display resolution than the other.

For example, when the resolution of the original video data is lower than the resolution of the image display device, display at a resolution lower than that of the display device may be acceptable. At this time, the same data is written to a plurality of pixels. However, since the same signal may be simultaneously input to a plurality of data signal line driving lines or a plurality of scanning signal line driving lines, a driving circuit which operates at the time of low resolution display is used. Can be reduced in the number of units. As a result, in low-resolution display, the size of the operation circuit is reduced, the number of wirings is reduced, the driving frequency is reduced, and the power consumption of the image display device is reduced.

The image display device according to the present invention is characterized in that, in the image display device, one of the plurality of display formats is a color display and the other is a monochrome display.

For example, when the original video data is only characters, tables, etc., it is displayed in black and white (halftones may be included).
But there are things you can do. Even if the pixel array is composed of red, green, and blue pixels and supports color display,
By writing the same data to one set of pixels of red, green, and blue, monochrome display becomes possible. At this time, the same signal may be input to a plurality of data signal line driving lines at the same time, so that the number of units of the driving circuit operating at the time of monochrome display can be reduced. As a result, in the monochrome display, the scale of the operation circuit and the number of wirings are reduced, and the power consumption of the image display device is reduced.

The image display device according to the present invention, in the image display device, includes a plurality of at least a part of the data signal line drive circuit, and at least one of the plurality of data signal line drive circuits includes a plurality of data signal line drive circuits. It is characterized in that the same image data is written to a signal line.

As described above, by writing the same image data to a plurality of data signal lines, the same image data is displayed in a plurality of pixels in the horizontal direction of the screen. It is possible to display at a lower resolution. For example, the same image data is written to a plurality of adjacent data signal lines.

At this time, the number of outputs of the data signal line driving circuit is reduced (for example, when writing the same image data to n data signal lines, the number is reduced to 1 / n). And the number or frequency of the data signal and the clock signal also decreases, so that the power consumption in the data signal line driving circuit is reduced.

Further, the image display device of the present invention, in the above-mentioned image display device, includes at least a part of the data signal line drive circuit, and at least one of the plurality of data signal line drive circuits has a horizontal direction. It is characterized in that the same image data is written to data signal lines corresponding to a plurality of pixels of successive same color.

As described above, the data signal lines corresponding to a plurality of pixels of the same color that are continuous in the horizontal direction, that is, the data signal lines corresponding to the pixels adjacent in the horizontal direction when attention is paid only to the pixels of the same color By writing the same image data on the line, the same image data is displayed in a plurality of pixels of the same color that are continuous in the horizontal direction, so that the physical properties of the image display device can be maintained without impairing the display color reproducibility. Display at a resolution lower than the resolution becomes possible.

At this time, the number of outputs of the data signal line driving circuit is reduced (for example, when writing the same image data to n data signal lines, the number is reduced to 1 / n). And the number or frequency of the data signal and the clock signal also decreases, so that the power consumption in the data signal line driving circuit is reduced.

Further, the image display device of the present invention, in the above-mentioned image display device, comprises at least a part of the data signal line drive circuit, and at least one of the plurality of data signal line drive circuits is arranged in a horizontal direction. 3 consecutive
It is characterized in that the same image data is written to data signal lines corresponding to a plurality of pixels of a color.

As described above, by writing the same image data to the data signal lines corresponding to a plurality of pixels of three colors continuous in the horizontal direction, the same image data is written in a plurality of pixels of three colors continuous in the horizontal direction. Is displayed, so that a monochrome display (gradation display is possible) can be performed.

At this time, the number of outputs of the data signal line drive circuit is reduced to 1/3 (for example, when one pixel unit is a pixel of three primary colors of RGB), the circuit scale of the data signal line drive circuit is reduced. At the same time, the number or frequency of the data signal and the clock signal is reduced, so that the power consumption in the data signal line driving circuit is reduced.

Further, according to the image display device of the present invention, in the above-described image display device, in a display format having a lower display resolution, a scanning signal is written to a plurality of continuous scanning signal lines at different timings, and In the scanning period, the same image data is output from the data signal line driving circuit.

As described above, the same image data is written to the data signal lines during the scanning period corresponding to the plurality of continuous scanning signal lines, so that the same image data is displayed in the pixels that are continuous in the vertical direction of the screen. Therefore, display at a resolution lower than the physical resolution of the image display device is possible.

At this time, by combining the above-mentioned means for reducing the resolution in the horizontal direction, the vertical and horizontal resolutions can be made the same.

Further, according to the image display device of the present invention, in the above-described image display device, in the display format having the lower display resolution, the scanning signals are written to the plurality of continuous scanning signal lines at different timings. The image data output from the data signal line driving circuit is held in each data signal line during a period including the scanning period.

As described above, in the scanning period corresponding to a plurality of continuous scanning signal lines, the image data output from the data signal line driving circuit is held in each data signal line, whereby the data signal Since the output cycle of the video data from the line drive circuit can be reduced, in addition to being able to display at a resolution lower than the physical resolution of this image display device, in the data signal line drive circuit, Since the number or frequency of the data signal and the clock signal is reduced, power consumption in the data signal line driving circuit is reduced.

Further, according to the image display device of the present invention, in the above-described image display device, in a display format having a lower display resolution, scanning signals are written to a plurality of continuous scanning signal lines at different timings, and In the scanning period, the data signal line driving circuit outputs image data corresponding to the same gray scale having different polarities.

As described above, in the scanning period corresponding to a plurality of continuous scanning signal lines, the data signal line driving circuit outputs image data corresponding to the same gray scale having different polarities, thereby allowing horizontal scanning. Also in the line inversion driving method, display at a resolution lower than the physical resolution can be performed without impairing display quality.

The reason why this is done when the horizontal line inversion driving method is adopted is as follows. When displaying by the horizontal line inversion driving method, as described above, if image data is to be held in the data signal lines during the scanning period corresponding to the plurality of scanning signal lines, inversion driving must be performed for each of the plurality of lines. Absent. However, in this case, a difference in potential between a plurality of pixels to which the same image data is written becomes large due to a parasitic capacitance between upper and lower pixels, and the like, which deteriorates display quality. On the other hand, when the polarity of the image data is changed for each line, the difference in the potential fluctuation of the pixel due to the parasitic capacitance between the upper and lower pixels is almost eliminated, and the display quality is not deteriorated.

Further, in the image display device of the present invention, in the above-mentioned image display device, in the display format having the lower display resolution, the image data written to each data signal line has the same polarity during one frame period. It is characterized by.

As described above, when the image data written to the data signal line has the same polarity during one frame period, the image data is held in the data signal line during the scanning period corresponding to the plurality of scanning signal lines. In some cases, there is almost no difference in the potential fluctuation of the pixel due to the parasitic capacitance between the upper and lower pixels, so that the display quality is not deteriorated.

Therefore, the image data output from the data signal line driving circuit is held in each data signal line during the scanning period corresponding to a plurality of continuous scanning signal lines without deteriorating the display quality. Since the driving method can be adopted and the output cycle of the video data from the data signal line driving circuit can be reduced,
In addition to enabling display at a resolution lower than the physical resolution of this image display device, the number or frequency of data signals and clock signals in the data signal line drive circuit is reduced, so that the data signal line drive Power consumption in the circuit is reduced.

Further, the image display device of the present invention is characterized in that in the above-described image display device, one of the plurality of display formats has a larger number of display gradations than the other.

For example, the required display gradation is different between the case where the original video data is characters, tables, graphs, animations and the like, and the case where the original video data is photographs and the like. When the display mode is the reflective display mode, the contrast ratio is smaller than that in the transmissive display mode. Therefore, it is not meaningful to increase the number of gradations unnecessarily.

As described above, depending on the image to be displayed and the display mode, the display gradation may be small. Correspondingly, one of the plurality of data signal line driving circuits is configured to have a smaller number of displayable gradations than the other, so that in the case of the low gradation display, the scale of the operation circuit is reduced and the wiring is reduced. The number and the number of terminals are reduced, and low power consumption of the image display device is realized.

Further, the image display device of the present invention is characterized in that, in the image display device, one of the plurality of display formats corresponds to a halftone display and the other is a binary display.

As described above, displaying with different gradations according to the type of image to be displayed and the display mode is an extremely effective method for reducing the power consumption of the image display device.

Here, when the original video data is characters, tables, graphs, etc., halftone display may not be necessary. In this case, driving with binary data (1 bit) is required. Thus, it is possible to further reduce power consumption. 2
The value data is a logic signal of 0/1, not an analog signal that is complicated in processing and weak to noise or the like, and can be processed only by a logic circuit. Therefore, the circuit scale of the drive circuit is significantly reduced, and a through current does not flow in the circuit, so that a great reduction in power consumption is realized.

In the case of a color-compatible image display device, eight colors can be displayed even with binary data, and the image display device often has sufficient expressive power.

Further, the image display device of the present invention, in the above-mentioned image display device, includes at least a part of the data signal line drive circuit, and includes a reference voltage selection circuit and an intermediate potential generation circuit in the data signal line drive circuit. When the display gradation is small, only the reference voltage selection circuit is operated, and the intermediate potential generation circuit is not operated,
On the other hand, when the number of display gradations is large, the reference voltage selection circuit and the intermediate potential generation circuit are operated together.

When the number of gradations is small, a desired gradation potential can be obtained by selecting one of a plurality of reference voltages supplied from the outside. However, when the number of gradations is large, it is not realistic to perform the same drive because the number of reference voltage lines increases geometrically. In that case, it is effective to generate multi-gradation data by generating an intermediate potential between the two reference potentials.

Therefore, according to the display format,
Operate the intermediate potential generation circuit and output the output of the reference voltage selection circuit to the data signal line via the intermediate potential generation circuit, or directly output the output of the reference voltage selection circuit without passing through the intermediate potential generation circuit. By outputting the signal to the signal line, the data signal line driving circuit sharing the circuit before the intermediate potential generation circuit can display data in a plurality of formats.

Further, the image display device of the present invention is the above-mentioned image display device, wherein at least a part of the data signal line drive circuit is provided, and an amplifier circuit is provided in the data signal line drive circuit. When the number of display gradations is small, the amplifier circuit is not operated. On the other hand, when the display gradation is large, the amplifier circuit is operated.

As described above, when the number of display gradations is large,
It is effective to operate the intermediate potential generation circuit. However, in general, the driving force of the intermediate potential generating circuit is not so large, and particularly when the screen is large and the load of the data signal line driving circuit is large, the data signal line is driven only by the intermediate potential generating circuit (writes video data). Can be difficult. In such a case, it is effective to add an amplifier circuit to the subsequent stage of the intermediate potential generation circuit and use this to write video data to the data signal line.

Therefore, when the display gradation is large, the intermediate potential generating circuit and the amplifier circuit are operated to drive the data signal line using the amplifier circuit, and when the display gradation is small, the intermediate potential generating circuit and the amplifier circuit are driven. By driving the data signal line without passing through, the data signal line drive circuit sharing the circuit before the intermediate potential generation circuit,
Display can be performed for a plurality of formats.

Here, since a steady current flows in a large amplifier circuit, not operating the amplifier circuit when the display gradation is small has a great effect on reducing the power consumption of the image display device.

Further, the image display device of the present invention is characterized in that, in the image display device, one of the input video signals is an analog signal and the other is a digital signal in the plurality of display formats. I have.

As a driving method of the image display device, there are an analog driving method and a digital driving method. In the analog drive system, the number of display gradations is basically infinite, and is determined by an externally input video signal. On the other hand, in the digital driving method, the number of display gradations is determined by the configuration of the data signal line driving circuit, and a large-scale and complicated driving circuit is required to perform display with more gradations. On the other hand, the digital drive method has an advantage that the video signal is processed by the digital signal until immediately before writing to the data signal line, so that the handling is easy.

Therefore, when the number of display gradations is large,
It is preferable to use the analog driving method, while, when the number of display gradations is small, it may be preferable to use the digital driving method.

Further, in the image display device according to the present invention, in the image display device, in one of the plurality of display formats, one of the input video signals is image data;
The other is characterized by being text data.

As described above, when one of the driving circuits supports color display and multi-gradation display, and the other driving circuit supports monochrome display and binary gradation display, or
When one of the driving circuits can display at a higher resolution than the other driving circuit, it is effective to switch the input destination of the video data and the driving circuit to be operated according to the type of the video data.

For example, an Internet device or a mobile phone capable of receiving images receives both text data such as a mail body and image data such as a WEB display, but handles it when a mail is used. Since the data is text, video data is input to a drive circuit corresponding to black-and-white binary display and operated, and when WEB is used, the data to be handled is image data. By inputting and operating video data, it is possible to realize an optimal display in terms of display quality and power consumption.

The image display device of the present invention is characterized in that, in the above-mentioned image display device, one of the plurality of display formats is one in which natural image data is input and the other is graphic data. And

As described above, when one of the driving circuits can perform multi-gradation display and high-resolution display more than the other driving circuit,
It is effective to switch the input destination of the video data and the driving circuit to be operated according to the type of the video data.

For example, when the data to be handled is graphic data or animation data, a higher resolution or display gradation may not be required as compared with a case where the data to be processed is a photograph or the like. By inputting video data to the drive circuit corresponding to the display and operating it,
It is possible to realize an optimal display in terms of display quality and power consumption.

Further, in the image display device of the present invention, in the image display device, one of the plurality of display modes as different display modes is a transmissive display mode and the other is a reflective display mode. It is characterized by:

As described above, it may be desirable to switch the display mode depending on the use environment, particularly the ambient brightness. For example, under strong external light, in the transmissive display mode, the display becomes hard to see due to the reflection of external light, whereas in the reflective display mode, the external light is reflected and displayed, so that the display becomes clearer. On the other hand, in a dark environment, the display becomes almost invisible in the reflective display mode.

In the transmissive display mode, since it is necessary to irradiate the backlight from below the image display device, the power consumption of the entire image display device becomes extremely large.
This is a major constraint on reducing power consumption.

Based on these, the use environment or
By switching the display mode between the transmissive type and the reflective type according to the type of video, it is possible to realize an optimal display in terms of display quality and power consumption.

Further, according to the image display device of the present invention, in the above-described image display device, any one of the above-described drive circuits provided at least in part includes:
The image data is not written in at least a part of the display area.

At this time, during a period corresponding to an image area where image data is not written, a part or all of a data signal line driving circuit and a scanning signal line driving circuit, and further, an external control circuit and a video signal processing circuit are used. Since the operation can be stopped, power consumption can be significantly reduced.

Further, according to the image display device of the present invention, in the above-described image display device, the output of the drive circuit is controlled using a signal corresponding to the drive timing of each signal line, so that the image data is stored in a partial area. Is not written.

For example, by inactivating the output pulse control signal in the data signal line driving circuit or the scanning signal line driving circuit, most of the operation of the driving circuit can be stopped, thereby reducing power consumption. It can be significantly reduced.

Further, in the image display device of the present invention, in the above-mentioned image display device, the output of the drive circuit is controlled by using the reset signal for stopping the scan of the drive circuit, so that the image display device can be partially provided. It is characterized in that no image data is written.

For example, by stopping the clock signal in the data signal line driving circuit or the scanning signal line driving circuit, the operation of the driving circuit can be stopped, thereby greatly reducing the power consumption. .

Further, according to the image display device of the present invention, in the above-mentioned image display device, a start signal for starting scanning of the driving circuit is inputted from an intermediate stage of the scanning circuit in the driving circuit. It is characterized in that no image data is written in the area of the section.

For example, in a data signal line driving circuit or a scanning signal line driving circuit, a configuration is adopted in which a start signal for starting the scanning can be inputted from an intermediate stage, so that only a part of the driving circuit is provided. Can be operated, thereby greatly reducing power consumption. That is, for example, in the case of a data signal line driving circuit, a start signal is input to a scanning circuit portion of a stage corresponding to a halfway column in a screen. For example, in the case of a scanning signal line driving circuit, a start signal is input to a scanning circuit portion of a stage corresponding to a halfway row in a screen.

Further, the image display device of the present invention is characterized in that, in the above image display device, the drive circuit having at least a part thereof is formed on the same substrate as the pixels. Features.

In such a configuration, a pixel array for performing display and a data signal line driving circuit or a scanning signal line driving circuit for driving pixels can be manufactured on the same substrate in the same process. As a result, it is possible to reduce the manufacturing cost and the mounting cost and increase the non-defective product rate.

In particular, as described above, when a plurality of drive circuits are provided for one pixel array, the effect is increased. This is because the cost and the mounting cost of the driving IC increase in proportion to the number of the driving circuits when the driving IC is connected and driven, while the above configuration has the same cost regardless of the number of the driving circuits. Thus, a plurality of drive circuits can be formed.

The image display device according to the present invention is characterized in that, in the above-mentioned image display device, the active circuit constituting the drive circuit is a polycrystalline silicon thin film transistor with respect to at least a part of the drive circuit. Features.

When a transistor is formed using a polycrystalline silicon thin film in this manner, a characteristic having a very high driving force can be obtained as compared with an amorphous silicon thin film transistor used in a conventional active matrix liquid crystal display device. In addition to the above effects, there is an advantage that the pixel and the signal line driver circuit can be easily formed over the same substrate. For this reason, it is possible to reduce the manufacturing cost and the mounting cost and increase the non-defective mounting rate.

Further, according to the image display device of the present invention, in the above-mentioned image display device, the active circuit constituting the drive circuit is provided at 600 ° C. on a glass substrate. It is characterized by being formed by the following process.

As described above, when a polycrystalline silicon thin film transistor is formed at a process temperature of 600 ° C. or less, glass that has a low strain point temperature but is inexpensive and can be easily enlarged can be used as a substrate. Therefore, in addition to the above effects, there is an advantage that a large-sized image display device can be manufactured at low cost.

An electronic apparatus according to the present invention is an electronic apparatus having an image display device as an output device, wherein the image display device is any one of the above-described image display devices.

Since the electronic device is provided with the image display device capable of switching the display mode and the display format as described above, the display quality of the output device and the electronic device can be changed in accordance with the use state of the electronic device and the surrounding environment. It is possible to achieve both reduction in overall power consumption.

The electronic device according to the present invention is characterized in that, in the electronic device, a period during which the electronic device is driven by an external power supply;
The display mode or the display format is switched between a period in which the battery is driven by the built-in battery.

When an electronic device is driven by a built-in battery, it is desirable to reduce the power consumption of the entire device as much as possible in order to enable long-term use. Therefore, during the period of driving with the built-in battery, the display is performed in the display mode or the display format with low power consumption, and when driven by the external power supply (such as AC power supply), there is no concern about the usage time. However, by performing display in a display mode or display format of high quality, it is possible to optimize the display corresponding to the use state and maximize the usable time.

Further, the electronic device of the present invention is characterized in that the display mode or display format is switched between the standby mode and the operating mode.

As a result, high display quality during operation and low power consumption during standby can be realized at the same time, and the visibility, operability, and convenience of the electronic device are greatly improved.

Further, the electronic device of the present invention is characterized in that, in the above electronic device, a display mode or a display format is switched according to the peripheral brightness at the time of use.

As a result, while minimizing power consumption,
It is possible to perform display that matches the usage environment, and the visibility, operability, and convenience of the electronic device are greatly improved.

The electronic device of the present invention can be a portable information terminal. Since the portable information terminal displays a wide variety of information from characters and figures to photographs, etc., by providing an image display device having the above characteristics, the visibility, operability, and convenience as an electronic device are greatly improved. .

Further, by providing the above-mentioned image display device capable of overwriting the display image (superimpose function), even when the portable information terminal is performing a certain process, the portable information terminal does not need to switch the screen at any time. , A mail document or the like can be displayed.

The electronic device of the present invention can be a mobile phone. In recent years, mobile phones have been increasingly connected to the Internet, and the information to be displayed has been expanded from conventional characters only to graphics and photographs. By providing an image display device having the above characteristics, visibility as an electronic device has been improved. And operability and convenience are greatly improved.

In the portable telephone, only the time and the radio wave state need to be displayed during the standby time, and a monochrome display or a binary display is sufficient for the display. Therefore, by providing the above-described image display device capable of performing display with low power consumption for such a display format, the standby time of the mobile phone can be significantly extended.

Further, by providing the above-mentioned image display device capable of overwriting the display image (superimpose function), the screen can be switched even when a mobile phone is displaying a large amount of information such as an image. A mail document or the like can be displayed at any time without any need.

The electronic device of the present invention can be a game machine. The game machine is compatible with color or black and white and has different display gradation depending on its application (software). In addition, the content (type) of the video is often different between the menu screen and the game. Therefore, by providing the image display device having the above characteristics, visibility, operability, and convenience as an electronic device are significantly improved.

Further, by providing the image display device capable of overwriting the display image (superimpose function), the time display can be performed at any time without switching the screen even during the execution of the game. And so on.

The electronic device of the present invention can be a video camera. Video cameras are devices that can be used in both outdoor and indoor environments. Therefore, by providing the image display device capable of selecting an optimal display mode and display format according to the usage environment, visibility, operability, and convenience as an electronic device are greatly improved. .

Some video cameras are capable of controlling devices using a display screen during shooting or playback. The command display, the time display, the counter display, and the like are generally binary displays. Therefore, in such equipment,
By providing the image display device capable of overwriting the display image (superimpose function), the control command can be easily overwritten and displayed on the captured image or the reproduced image.

The electronic device of the present invention can be a still camera. A still camera is a device that can be used in both outdoor and indoor environments. Therefore, by providing the image display device capable of selecting an optimal display mode and display format according to the usage environment, visibility, operability, and convenience as an electronic device are greatly improved. .

Some still cameras are capable of controlling devices using a display screen during shooting or playback. The command display, the time display, the counter display, and the like are generally binary displays. Therefore, in such equipment,
By providing the image display device capable of overwriting the display image (superimpose function), the control command can be easily overwritten and displayed on the captured image or the reproduced image.

The electronic device of the present invention can be an electronic book. In addition to books written only with textual information, there is a possibility that various types of e-books will be published, such as those containing pictures and tables, manga mainly composed of animation, photo books, etc. (Type of book data)
It is important to optimize the display format according to the requirements in order to achieve both the visibility of the device and the low power consumption. Furthermore, in the case of Japanese notation, reading (ruby) may be added, and in that case, a higher resolution is desired. Therefore, by providing the image display device having the above characteristics, visibility and operability as an electronic device,
Convenience is greatly improved.

Further, the electronic book is provided with the above-mentioned image display device capable of overwriting the display image (superimpose function), so that the control of the device and the time can be easily performed by using the display screen during the display. Display and the like can be performed.

The electronic device of the present invention can be used as a navigation system. The navigation system has different display resolutions and display gradations depending on the software. In addition, recently, there has been a television which can display a television image. Therefore, the image display device which can optimize a display format according to a use state, such as a menu screen which may have a small display gradation, a navigation screen (map display), and a television image display which requires full color display. By having
The visibility, operability, and convenience as electronic devices are greatly improved.

In the navigation, the image display device capable of overwriting the display image (superimpose function) is provided, so that the control of the device, the time display, and the route display can be easily performed by using the display screen. And multi-screen display.

The electronic device of the present invention can be a television receiver. A television receiver is a device that can be used in both outdoor and indoor environments. Therefore, by providing the image display device capable of selecting an optimal display mode and display format according to the usage environment, visibility, operability, and convenience as an electronic device are greatly improved. .

In addition, the television receiver is provided with the image display device capable of overwriting the display image (superimpose function), so that the channel display and the time display can be easily performed. .

The electronic device of the present invention can be a video reproducing device. Video tape recorder or D
Video playback devices such as VD (Digital Versatile Disk) are becoming smaller and portable devices are being realized.
It is a device that can be used in both outdoor and indoor environments. Therefore, by providing the image display device capable of selecting an optimal display mode and display format according to the usage environment, visibility, operability, and convenience as an electronic device are greatly improved. .

[0191] Further, the video reproducing apparatus is provided with the above-mentioned image display device capable of overwriting the display image (superimpose function), so that when reproducing a movie or a language teaching material, the user can easily use it. You can switch the presence or absence of subtitle display.

The electronic device of the present invention can be a computer. Since a computer displays a wide variety of information from characters and figures to photographs and the like, by providing an image display device having the above characteristics, the visibility, operability, and convenience as an electronic device are greatly improved.

Further, since the computer is provided with the above-mentioned image display device capable of overwriting the display image (superimpose function), images having different signal sources can be displayed as separate windows, so that the multi-window can be easily displayed. Display becomes possible. For example, displaying a window such as a television image (video image) on a computer screen can be realized without performing image signal processing.

[0194]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

The image display device according to the present embodiment is provided with a plurality of drive circuits, and switches to an optimum display mode and display format in accordance with the type and operating environment of video data, thereby achieving high display quality. Low power consumption can be achieved at the same time, and a plurality of image data can be overlapped and displayed by operating a plurality of drive circuits simultaneously.

In the present embodiment, an active matrix type liquid crystal display device will be described here as an example of an image display device which is an object technology of the present invention. However, the present invention is not limited to this, and is effective for other image display devices.

FIGS. 1 to 7 are block diagrams showing a configuration example of an image display device according to the present invention.

In FIG. 1, the image display device has a pixel array ARY, data signal line driving circuits (source drivers) SD1 and SD2 for driving data signal lines, and a scanning signal line driving circuit (for driving scanning signal lines). Gate driver) GD, timing circuit CTL for supplying a timing signal, and video signal processing circuit VID for supplying a video signal
Consists of Here, the data signal line drive circuit SD1
And SD2 are arranged on the same side of the pixel array. Hereinafter, the data signal lines are collectively referred to as SL, and are individually represented as SL1, SL2,. Similarly, the scanning signal lines are collectively referred to as GL, and are individually referred to as GL1, GL2,
... and so on. SCK1, SCK2, and GCK are clock signals, and SST1, SST2, and GST are start signals. GEN is an enable signal. DA
T1 and DAT2 are video signals.

In FIG. 2, the image display device comprises:
It comprises a pixel array ARY, a data signal line driving circuit SD, scanning signal line driving circuits GD1 and GD2, a timing circuit CTL for supplying a timing signal, and a video signal processing circuit VID for supplying a video signal. here,
The scanning signal line driving circuits GD1 and GD2 are arranged on the same side of the pixel array. SCK, GCK1,
GCK2 is a clock signal, and SST, GST1, GST
ST2 is a start signal. GEN1 and GEN2 are enable signals. DAT is a video signal. GCS
1, GCS2 is a selection signal (a signal for controlling which scanning signal line driving circuit is operated).

In FIG. 3, the image display device comprises:
It comprises a pixel array ARY, data signal line driving circuits SD1 and SD2, a scanning signal line driving circuit GD, a timing circuit CTL for supplying a timing signal, and a video signal processing circuit VID for supplying a video signal. here,
The data signal line drive circuits SD1 and SD2 are arranged on the opposite side of the pixel array.

In FIG. 4, the image display device comprises:
It comprises a pixel array ARY, a data signal line driving circuit SD, scanning signal line driving circuits GD1 and GD2, a timing circuit CTL for supplying a timing signal, and a video signal processing circuit VID for supplying a video signal. here,
The scanning signal line driving circuits GD1 and GD2 are arranged on the opposite side of the pixel array.

In FIG. 5, the image display device comprises:
Pixel array ARY, data signal line drive circuits SD1 and SD2, and scan signal line drive circuits GD1 and GD2
And a timing circuit CTL for supplying a timing signal
And a video signal processing circuit VID for supplying a video signal. Here, the data signal line driving circuits SD1 and SD2 and the scanning signal line driving circuits GD1 and GD2
Each is arranged on the opposite side to the pixel array.

In FIG. 6, the image display device comprises:
It comprises a pixel array ARY, a data signal line driving circuit, a scanning signal line driving circuit GD, a timing circuit CTL for supplying a timing signal, and a video signal processing circuit VID for supplying a video signal. Here, the data signal line drive circuit has two circuit parts, namely, a shift register circuit SSR which is a common part and a part SDB1 which is independent from each other.
And SDB2, the SSR and SDB
1, one data signal line drive circuit, and SSR and S
DB2 forms another data signal line drive circuit.

In FIG. 7, the image display device comprises:
It comprises a pixel array ARY, a data signal line driving circuit SD, a scanning signal line driving circuit, a timing circuit CTL for supplying a timing signal, and a video signal processing circuit VID for supplying a video signal. Here, the scanning signal line driving circuit includes two circuit parts, namely, a shift register circuit GSR which is a common part, and independent parts GDB1 and GDB2, respectively.
And one scanning signal line driving circuit, and GSR and GDB
2 constitutes another scanning signal line driving circuit.

In the above configuration example, the data signal line driving circuits SD1 and SD2 or the scanning signal line driving circuits GD1 and GD2 can drive the same pixel array. Further, different circuit configurations are employed so that images in different formats such as resolution and gradation (the number of display colors) can be displayed.

Here, it is desirable to stop the operation of the plurality of driving circuits that do not contribute to display, from the viewpoint of power consumption and also to avoid malfunction due to noise.

FIGS. 8 and 9 show examples of signal timing charts at this time.

FIG. 8 is a timing chart corresponding to the configuration of FIG. 1. In the operation state, a control signal or a video signal is input to only one of the two data signal line driving circuits.
The other indicates that it is not in operation.

FIG. 9 is a timing chart corresponding to the configuration of FIG. 2. In FIG. 9, an active selection signal GCS1 is input to only one of the two scanning signal line driving circuits, and control signals (GCK1, GST1) are input. , GEN1)
Is input to indicate that it is operating and the other is inactive.

FIG. 10 and FIG.
5 is an example of a timing chart when switching between a data signal line driving circuit and a scanning signal line driving circuit to be operated is performed in frame units. An optimal display can be selected according to the format of each screen (frame) of the image to be displayed.

FIG. 12 and FIG.
5 is an example of a timing chart when switching between a data signal line driving circuit and a scanning signal line driving circuit to be operated is performed in the middle of a frame. When each screen includes a plurality of types of images such as photographs and characters and is displayed in different areas, the image can be displayed in a different format for each area of the screen.

FIGS. 14 and 15 show the operating states of the data signal line driving circuits and the scanning signal line driving circuits at this time, and the states of images displayed by the driving circuits. In the figure, the hatched lines indicate that the drive circuit is operating.

FIG. 16 is an example of a timing chart when a plurality of data signal line driving circuits are simultaneously operating at least for a part of the time and writing image data. By writing different image data from each data signal line driving circuit, a plurality of images can be easily combined and displayed.

FIG. 17 shows the operation state of each data signal line driving circuit at this time and the state of an image displayed by those driving circuits. In the figure, the hatched lines indicate that the drive circuit is operating.

FIGS. 18 and 19 show an example of the configuration of a data signal line drive circuit for overwriting (superimposing) an image. In the figure, SCK (and / SC
K) is a clock signal, SST is a start signal, FF is a flip-flop, N1, N2,... Are output pulses, IMP is a superimpose control signal, AS is an analog switch, S1, / S
1, ... are input signals to the analog switch AS. DIG is a digital video signal, TFG is a transfer gate, LT is a latch circuit, and DA is a digital-analog conversion circuit. FIG. 18 illustrates an example of an analog data signal line driving circuit, and FIG. 19 illustrates an example of a digital data signal line driving circuit. In any case, only when the superimpose control signal IMP as the overwrite control signal is active, the analog video signal DAT or the digital video signal DIG is written to the data signal line. By combining them, overwriting of an image can be realized.

That is, the superimpose control signal IMP is a signal for controlling the superimpose function, and only when the superimpose function is active, the video signal (the potential level of DAT or the potential level corresponding to DIG). Is written to the data signal line.

The signals such as the superimpose control signal IMP and the transfer gate TFG are other control signals (SCK,
Like SST, SCS, etc.), it is created by the timing circuit CTL and input to the data signal line drive circuit. Also,
The signals such as the IMP and TFG are controlled by a control signal SEL described later.
Thus, the data signal line drive circuit can be output only when it is selected (driven). In this way, unnecessary signals are not transmitted,
Power consumption can be reduced accordingly.

The TFG is set during the horizontal retrace period, that is, when 1
It becomes active during the period from the end of the input of the binary or superimposed video signal for the horizontal line to the start of the input of the video signal for the next one horizontal line. Thereby, all the video signals for one horizontal scanning period are simultaneously written to the data signal line SL.

At this time, the overwriting of the image can be performed in units of the horizontal scanning period, or can be performed only in a part of the horizontal scanning period. This means that the superimpose control signal IMP is changed during the horizontal scanning period.
It is possible to control whether to keep it always active or to make it active only when video data to be overwritten is input.

FIGS. 20 and 21 show the state of image display when the above driving is performed. FIG. 20 shows an example in which an image is overwritten in units of a horizontal scanning period, and text data including a white background is overwritten in about one third of the area below the screen. On the other hand, FIG. 21 shows an example in which the image is overwritten only in a part of the horizontal scanning period, in which only the black portion of the character is overwritten, and the original image is displayed in those gaps and remains. ing.

To overwrite an image in this way, it is necessary to write the original video data to the data signal line and then write the overwritten video data to the data signal line. This can be realized by overwriting video data using a blanking period in the horizontal scanning period, or by writing video data to be overwritten with a certain time delay from the writing of the original video data.

FIG. 22 is an example of a timing chart when video data is overwritten using a retrace period in the horizontal scanning period. FIG. 23 is a diagram showing a timing delay from the writing of the original video data by a certain time. 5 is an example of a timing chart when writing video data to be overwritten.

FIG. 24 shows an example of the configuration of a data signal line drive circuit that realizes an overwrite function specialized for overwriting characters. In FIG. 24, in synchronization with the output of the shift register circuit, a binary superimposed video signal IMD, which is an overwritten video signal, is fetched, and only when this superimposed video signal IMD is active, it is connected to the data signal line. Data (black or white) is written. Therefore, by inputting the superimposed video signal IMD corresponding to the black portion of the character, the signal is not written in the portion between the characters, and the original video remains. It can be realized as a function that can be easily switched.

FIG. 25 is an example of a timing chart at this time. That is, the superimposed video signal IMD is a binary superimposed video signal as a video signal for overwriting. Also, video level DL
V is a signal of a potential level corresponding to a write level of a video signal in superimposed display. In the case of line inversion driving, the polarity is inverted every horizontal period as shown in FIG. After the binary superimposed video signal IMD for one horizontal line is fetched into the first latch circuit (LT), a transfer signal TFG is input to
Analog switch AS as a selection switch for all binary superimposed video signals for horizontal lines at the same time
And writes the signal of the write level in the superimposed display to the data signal line.

FIGS. 26 to 29 show another example of the configuration of the present invention. In FIG. 26, the image display device includes a pixel array ARY and a data signal line driving circuit SD1.
And SD2, a scanning signal line driving circuit GD, a timing circuit CTL for supplying a timing signal, and a video signal processing circuit VID for supplying a video signal. Here, select signals SCS1 and SCS2 as operation control signals for controlling which data signal line drive circuit is driven are externally input to the data signal line drive circuits SD1 and SD2.

In FIG. 27, the image display device includes a pixel array ARY and a data signal line driving circuit SD.
, Scanning signal line driving circuits GD1 and GD2, a timing circuit CTL for supplying a timing signal, and a video signal processing circuit VID for supplying a video signal. Here, the selection signals GCS1 and GCS2 for controlling which of the scanning signal line driving circuits are driven are externally input to the scanning signal line driving circuits GD1 and GD2.

In FIGS. 26 and 27, common input signals (for example, SCK and SST, GCK and GST, GEN, etc.)
Are input to both drive circuits, but these selection signals SCS1 and SCS2 or GCS1 and GCS1
CS2 is controlled by a control signal SEL input from the outside.

FIG. 28 is a diagram showing another configuration example of the present invention. In FIG. 28, the image display device includes a pixel array ARY and data signal line driving circuits SD1 and SD2.
, A scanning signal line driving circuit GD, a timing circuit CTL for supplying a timing signal, and a video signal processing circuit VID for supplying a video signal. The data signal line drive circuit SD1 is capable of multi-tone display, and the data signal line drive circuit SD2 is capable of only binary display.

Here, as shown in FIG. 28 (a), when the video inputted from the outside is image data, the data signal line drive circuit SD1 operates, and as shown in FIG. 28 (b), When the image input from outside is character data, the data signal line drive circuit SD2 is operated to display the data signal line in an optimal format according to the type of the input image data. The drive circuit can be switched.

FIG. 29 is a diagram showing another configuration example of the present invention. In FIG. 29, the image display device includes a pixel array ARY and data signal line driving circuits SD1 and SD2.
, A scanning signal line driving circuit GD, a timing circuit CTL for supplying a timing signal, and a video signal processing circuit VID for supplying a video signal. The data signal line drive circuit SD1 is capable of multi-tone display, and the data signal line drive circuit SD2 is capable of only binary display.

As shown in FIG. 29A, when the data signal line driving circuit SD1 operates, the backlight is turned on and the image display device is in the transmissive display mode. As shown in ()), when the data signal line driving circuit SD2 operates, the backlight is turned off and the image display device is in the reflective display mode. The compatibility between the transmissive display mode and the reflective display mode depends on each pixel PI
This is possible by providing a region through which light is transmitted and a region through which light is reflected within X.

In an environment where the surroundings are relatively dark such as at night or indoors, the data signal line driving circuit SD1 is operated. In an environment where external light is strong such as outdoors during the daytime, the data signal line driving circuit SD1 is driven. By operating the circuit SD2, display in an optimal display mode and display format can be performed according to the usage environment.

FIG. 30 is a diagram showing another configuration example of the present invention. FIG. 30 shows an example of format conversion of a video signal in the video signal processing circuit VID. The input video signal DIN input as the original video signal is converted into one of a plurality of convertible formats by an external control signal. For example, when the original video signal is an 8-bit VGA (640 × 480 pixel) signal,
In terms of resolution and gradation, it is possible to convert the signal into the same signal (FIG. 10A) or a smaller signal (FIG. 10B). In FIG. 3B, the 8-bit VGA signal is converted to the 4-bit QVGA.
(320 × 240 pixels).

By providing a circuit having such a format conversion function, an image display device capable of displaying in a plurality of formats can be realized.

FIG. 31 is a diagram showing another configuration example of the present invention. FIG. 31 shows an example of conversion of a timing signal in the timing circuit CTL. Based on an input timing signal TIN input as an original timing signal, one of a plurality of timings that can be generated is generated by an external control signal. For example, the original video signal is a clock signal CLK which is an original clock corresponding to VGA (640 × 480 pixels) display or a synchronization signal VSYN.
When the signals are C and HSYNC, the clock signals GCK and SCK and the start signals GST and SS corresponding to the display format are converted from these signals by an external control signal.
T is generated and input to the drive circuit. As shown in FIGS. 7A and 7B, the clock signals GCK and SCK and the start signals GST and SST of the corresponding frequency are generated according to whether the control signal is high or low.

By providing such a circuit having a plurality of timing signal generating functions, it is possible to realize an image display device capable of displaying in a plurality of formats.

FIGS. 32 and 33 show another example of the configuration of the present invention. In FIG. 32, the image display device includes a pixel array ARY and a data signal line driving circuit SD1.
And SD2, a scanning signal line driving circuit GD, a timing circuit CTL for supplying a timing signal, and a video signal processing circuit VID for supplying a video signal. Immediately after being output from the timing circuit CTL, the start signal SST and the clock signal SCK are input to either the data signal line drive circuit SD1 or SD2 by the changeover switch SLT (timing signal supply destination switching means).

In FIG. 33, the image display device includes a pixel array ARY and a data signal line driving circuit SD1.
And SD2, a scanning signal line driving circuit GD, a timing circuit CTL for supplying a timing signal, and a video signal processing circuit VID for supplying a video signal. The start signal SST and the clock signal SCK are supplied to the changeover switch S immediately after being output from the timing circuit CTL.
LT, the data signal line drive circuit SD1 or SD
2 and the video signal DA
A switch SLD (video signal supply destination switching means) immediately after T is output from the video signal processing circuit VID
Is input to either the data signal line drive circuit SD1 or SD2.

As described above, since the timing signal and the video signal are supplied to only one of the driving circuits by the changeover switch and unnecessary signals are not supplied, an increase in power consumption is avoided. It has become possible. The changeover switch SLT and the changeover switch SLD can be controlled by, for example, a detection circuit SEN (see FIG. 34) and a determination circuit JDG (see FIG. 35) described later.

FIG. 34 and FIG. 35 are diagrams showing another configuration example of the present invention. In FIG. 34, the image display device includes a pixel array ARY and a data signal line driving circuit SD1.
And SD2, a scanning signal line driving circuit GD, a timing circuit CTL for supplying a timing signal, a video signal processing circuit VID for supplying a video signal, and a detection circuit SEN (detection means) as a sensor for detecting a use environment. Consists of

Here, the use environment (brightness, etc.) is detected by the detection circuit SEN, and the result is input to the timing circuit CTL as the display mode switching means and the video signal processing circuit VID, so that the timing signal and the video signal are output. The format of the signal is optimized and the display is adapted to the usage environment.

In FIG. 35, the image display device includes a pixel array ARY and a data signal line driving circuit SD1.
And SD2, a scanning signal line driving circuit GD, a timing circuit CTL for supplying a timing signal, a video signal processing circuit VID for supplying a video signal, and a determination circuit JDG (video type determination means) for determining the type of video. Consists of

Here, the discriminating circuit JDG discriminates the type of the video from the input data IN (for example, when a tag indicating the type is included at the beginning of the data,
This can be discriminated by reading this), and the result is converted into a timing circuit CT as a display mode switching means.
By inputting L and the video signal processing circuit VID, the format of the timing signal and the video signal is optimized, and the display corresponding to the type of video is performed.

FIGS. 36 to 38 are diagrams showing another configuration example of the present invention. 36 to 38,
The image display device includes a pixel array ARY, data signal line driving circuits SDI and SD2, and a scanning signal line driving circuit GD.
And a timing circuit CTL for supplying a timing signal
, A video signal processing circuit VID for supplying a video signal, and a power supply circuit VGEN. In the figure, Vs1 ₊ , Vs1
_- , Vs2 ₊ , Vs2 _- are terminals on the data signal line driving circuit side to which a voltage is input from the power supply circuit VGEN, and Vg
_+, Vg _-, a voltage from the power supply circuit VGEN is input, a scanning signal line drive circuit side terminals.

In the structure of FIG. 36, the signal terminals of the independent timing circuit CTL and the power supply terminal of the power supply circuit VGEN correspond to the two data signal line drive circuits SD1 and SD2. On the other hand, in the configuration of FIG. 37, two data signal line driving circuits SD1 and SD1
2, the signal terminals of the independent timing circuits CTL correspond to each other, but the power supply terminal of the power supply circuit VGEN is common. In the configuration of FIG. 38, the signal terminal of the timing circuit CTL and the power supply terminal of the power supply circuit VGEN are common to the two data signal line drive circuits SD1 and SD2.

In the two data signal line drive circuits SD1 and SD2, the same input signal and power supply voltage are used. In this case, the number of terminals can be reduced by using a common terminal. Since there is a concern that wiring of signal lines becomes complicated and noise increases, which one to adopt is determined from the specifications and configuration of the entire image display device.

FIG. 39 is a diagram showing another configuration example of the present invention. In FIG. 39, the image display device includes a pixel array ARY and data signal line driving circuits SD1 and SD2.
, A scanning signal line driving circuit GD, a timing circuit CTL for supplying a timing signal, a video signal processing circuit VID for supplying a video signal, and a power supply circuit VGEN. Here, a switch VGENSW for controlling power supply from the power supply circuit VGEN is provided, and power is not supplied to the data signal line drive circuit which is not operated. Thus, the power consumption of the data signal line driving circuit that is not operated can be reduced to zero, which is effective in reducing the power consumption. The switch VGENSW is, for example, a detection circuit SEN (FIG. 3)
4) and a discrimination circuit JDG (see FIG. 35).

FIG. 40 is a diagram showing another configuration example of the present invention. In FIG. 40, the image display device includes a pixel array ARY and data signal line driving circuits SD1 and SD2.
, A scanning signal line driving circuit GD, a timing circuit CTL for supplying a timing signal, and a video signal processing circuit VID for supplying a video signal.

Here, two data signal line driving circuits SD
A switch SDSW (drive circuit separating means) is provided between the data signal lines SL and 1 and SD2, and the data signal lines are electrically connected to only one of the data signal line drive circuits. I have. The above switch SDSW
Can be controlled by, for example, selection signals SCS1 and SCS2 (see FIG. 26).

Depending on the configuration of the data signal line driving circuit,
A signal of a constant voltage may be output even when it is not operating, but in such a case, the output signals from the two data signal line driving circuits collide and a desired signal cannot be obtained. Sometimes. By electrically disconnecting one of the data signal line driving circuits as in the present configuration example, such a problem can be avoided. FIG. 41 shows a timing chart at this time.

Similarly, in order to prevent the output signals from the two scanning signal line driving circuits from colliding with each other and not being able to obtain a desired signal, the configuration of the scanning signal line driving circuit is as shown in FIG. In addition, a control switch TG is added after the last buffer (inverter circuit in the figure).

FIGS. 43 and 44 are diagrams each showing another configuration example of the present invention. In FIG. 43, a display mode and a display format are switched by selecting a driving circuit to be operated. One (FIG. (A)) has a high display quality, and the other (FIG. (B)) has a low display quality. Here, the display quality refers to the resolution, the display gradation, and the number of display colors.
This includes a transmissive display and a reflective display.

Similarly, in FIG. 44, the display mode and the display format are switched by selecting the drive circuit to be operated. Here, one (FIG. 7A) is a display with large power consumption, and the other (FIG. 2B) is a display with small power consumption. The power consumption here includes the contribution of the backlight depending on whether the display is transmissive or reflective.

FIG. 45 is a diagram showing another configuration example of the present invention. In FIG. 45, one (FIG. 45A) is a high-resolution display, and the other (FIG. 45B) is a low-resolution display. Display with low resolution is realized by writing the same signal to a plurality of data signal lines and scanning signal lines, so that the number of signal lines input to the driving circuit and the number of units of the driving circuit can be reduced. This has the advantage that power consumption is reduced.

Here, the display resolution can be changed by configuring the data signal line driving circuit and the scanning signal line driving circuit as shown in FIGS. 46 and 47, respectively. In each of the configurations of FIGS. 46 and 47, the output of the drive circuit is connected to a plurality of (two in FIG. 46 and FIG. 47) signal lines (data signal lines and scanning signal lines, respectively). Therefore, the same signal is written to the plurality of signal lines.

Here, in the case of color display, in order to change the display resolution, the same video signal is written to the nearest data signal line corresponding to the same color, instead of the adjacent data signal line. FIG. 48 shows a configuration example of the data signal line driving circuit at this time.

FIG. 49 is an example of a timing chart when the resolution on the scanning signal line side is reduced. In order to reduce the resolution, the same video signal is written to pixels on a plurality of lines. Here, as shown in FIG. 49, the operation of the data signal line driving circuit can be temporarily stopped by holding the video signal written from the data signal line driving circuit to the data signal line over a plurality of horizontal scanning periods. As a result, power consumption of the data signal line driver circuit can be reduced.
That is, after a data signal (potential) is applied to each data signal line during a certain horizontal scanning period (referred to as A), at least the next horizontal scanning period after A, such as the next horizontal scanning period and thereafter, is used. During the one or more horizontal scanning periods, a new data signal is not applied to the data signal line from the data signal line driving circuit. Thus, each data signal line holds a potential in which a data signal is applied in the horizontal scanning period A during a plurality of continuous horizontal scanning periods including the horizontal scanning period A.

Here, in order to reduce the difference in pixel potential fluctuation due to the parasitic capacitance between adjacent pixels, the polarity of the video signal on the data signal line must be the same during one screen (one frame). desirable. FIG. 50 shows a timing chart at this time.

FIGS. 51 and 52 show another example of a timing chart when the resolution on the scanning signal line side is reduced. In FIGS. 51 and 52, a configuration is adopted in which a signal having the same absolute value but a changed polarity is written to a pixel in each horizontal scanning period.
By adopting such a configuration, there is no difference in fluctuation of the pixel potential, so that high display quality can be realized.

FIGS. 53 to 56 are diagrams showing another configuration example of the present invention. FIGS. 53 to 56 also show examples of images whose display quality is switched by the driving circuit to be operated.

In FIG. 53, one (FIG. 53A) is a color display and the other (FIG. 53B) is a black and white display. Since monochrome display is realized by writing the same signal to a plurality of data signal lines corresponding to R (red), G (green), and B (blue) color display, signal lines input to the drive circuit And the number of units of the drive circuit can be reduced, and there is an advantage that power consumption is reduced.

FIG. 54 shows a configuration example of the data signal line driving circuit at this time. Video signals from the same video signal line DAT are converted into three data signal lines SL1 corresponding to R, G, and B.
r, SL1g, and SL1b.
As a result, monochrome display (including halftones such as gray) is possible.

It is also possible to combine the configuration of FIG. 48 with the configuration of FIG. That is, video signals from the same video signal line DAT are converted into a plurality of sets of data signal lines SL1r, SL1g, SL1b, SL corresponding to R, G, and B.
2r, SL2g, and SL2b. As a result, a data signal line driving circuit that supports low resolution and monochrome display can be realized. At this time, since the scale of the data signal line driving circuit can be further reduced, the power consumption can be further reduced.

In FIG. 55, one (FIG. 55A) has multiple gradations (16 gradations) and the other (FIG. 55B) has a small number of gradations (four gradations). In FIG. 56, one (FIG. 56A) has multiple gray scales (8 gray scales), while the other (FIG. 56B) shows black and white display (2 gray scales). In the case of a digital drive circuit, for display with few gradations,
Since the number of video signals input from the outside is reduced and the circuit configuration is simplified, power consumption is reduced. Further, depending on the configuration, the digital-analog conversion circuit and the amplifier circuit are not provided, and only the reference voltage selection circuit can be used. In this case, power consumption can be further reduced.

FIG. 57 shows an example of a two-level display for realizing two-tone display.
4 is a configuration example of a value output drive circuit. According to the input digital video signal DIG, one of the white display reference signal DW and the black display reference signal DB is selected and output to the data signal line SL.

Since this binary output drive circuit is composed of only digital circuits and has a very simple circuit configuration, it has a feature that power consumption during operation can be suppressed to a small level. That is, when performing binary display, low power consumption can be realized by writing a video signal with a drive circuit specialized for such binary output.

FIG. 58 is an example of a timing chart at this time. That is, DIG is a binary digital video signal. The reference signals DB and DW are signals of potential levels corresponding to black and white display, respectively, as described above. In the case of line inversion driving, the polarity is inverted every horizontal period as shown in FIG. . 2 for one horizontal line
The value of the digital video signal DIG is supplied to the first latch circuit (L
T), a TFG, which is a transfer signal, is input, whereby all the binary video signals for one horizontal line are simultaneously transferred to the selection circuit ST as a selection switch, and the black level (DB) or the white level is output. The level (DW) potential is written to the data signal line.

FIGS. 59 and 60 are diagrams showing a configuration example of a digital data signal line driving circuit. In these driving circuits, the display format control signal FMT allows a part of the circuit to be skipped in accordance with the number of tones of an image to be displayed, so that the number of display tones can be changed.

In FIG. 59, first, the digital video signal DIG is latched by the latch circuit LAT and then decoded by the multiplexer MUX. Based on this, the video signal reference potential VR is generated by the reference voltage selection circuit VSEL.
A corresponding reference signal is selected from EF. At this time,
If there are many display gradations, the display format control signal F
MT switches the selection switch SWT to the intermediate potential generation circuit DA.
The signal is switched to the C side, two reference signals are selected by the upper bits and input to the intermediate potential generation circuit DAC, and an intermediate potential is generated by the lower bits. When the number of display gradations is small, the intermediate potential generation circuit DAC is disconnected, and only one reference signal is selected from the video signal reference potential VREF by the reference voltage selection circuit VSEL.
It is directly output to the data signal line SL.

Here, in the case of displaying an image having a small number of gradations, by adopting a configuration in which the intermediate potential generation circuit DAC is skipped, many circuits can be shared and the circuit scale can be reduced. It is possible to do.

On the other hand, in FIG. 60, in addition to the configuration of FIG. 59, an analog amplifier (amplifier circuit) AMP is added to the subsequent stage of the digital-analog conversion circuit including the reference voltage selection circuit VSEL and the intermediate potential generation circuit DAC. ing. This allows the data signal line to be charged by the analog amplifier AMP having a large current driving force when the load on the data signal line SL is large and cannot be sufficiently driven by the intermediate potential generation circuit DAC alone.

As in the case of FIG. 59, in the case of displaying an image with a small number of gradations, a configuration in which the intermediate potential generating circuit DAC and the analog amplifier AMP are skipped is adopted, so that many circuits are shared. And the circuit scale can be reduced.

FIG. 61 is a diagram showing another configuration example of the present invention. In FIG. 61, one of the two data signal line driving circuits is an analog driving circuit ((a)), and the other is a digital driving circuit ((b)). That is, as shown in FIG. 3A, the data signal line drive circuit SD1 is an analog drive circuit, and as shown in FIG. 3B, the data signal line drive circuit SD2 is a digital drive circuit. In the analog drive circuit, the displayable gradation is infinite, and no matter what format video signal is input,
Power consumption is almost unchanged. On the other hand, in a digital drive circuit, the gray scale that can be displayed can be changed depending on the circuit configuration, and the power consumption also changes accordingly. Therefore, an optimal combination of display quality and power consumption can be realized by combining an analog drive circuit and a digital drive circuit.

Here, the configuration examples of the analog drive circuit and the digital drive circuit are as described above. That is, the analog data signal line driving circuit includes a dot sequential driving circuit (without an amplifier) shown in FIG.
And line-sequential drive (with amplifier). As a digital data signal line driving circuit, there are a circuit shown in FIG. 98 (without an amplifier) and a circuit shown in FIG. 99 (with an amplifier). All of the digital data signal line driving circuits are driven line-sequentially.

FIGS. 62 and 63 show another example of the structure of the present invention. In FIG. 62, one (FIG. 62A) shows a display when graphic data is input, and the other (FIG. 62B) shows a display when character data is input. In graphic display, color display or gradation display is desirable, while in character display, black and white binary display may be sufficient. Therefore, it is effective to switch the display format to reduce power consumption.

FIG. 63 shows a display when natural image data is input (FIG. 63A), and a display when graphic graph data is input (FIG. 63B). Is displayed. In natural image display, multi-tone display (64 tones or more) is desirable in color display, whereas in displaying figures and graphs, color display of about several tones may be sufficient. It is effective to reduce power consumption.

FIG. 64 is a diagram showing another configuration example of the present invention. In FIG. 64, one (FIG. 64A) is in the transmissive display mode, and the other (FIG. 64B) is in the reflective display mode. Here, by forming a light-transmitting area and a light-reflecting area in each pixel, a transmissive display mode is set when the backlight is turned on, and a reflective display mode is set when the backlight is turned off. You can do so.

As another configuration example of the present invention, there is a configuration that enables an image to be displayed on only a part of the screen. FIG.
5, FIG. 66, FIG. 69, FIG. 72, and FIG. 74 are examples of timing charts for realizing this.

In FIG. 65, by partially stopping the enable signal (GEN) of the scanning signal line driving circuit, the scanning signal line driving circuit is only partially operated, and the image is partially scanned in the vertical direction of the screen. Is displayed. At this time, during the period when the scanning signal line driving circuit stops operating,
Since it is not used for display, it is desirable that the operation of the data signal line drive circuit and the signal input (SCK, SST, DAT, etc.) are also stopped.

In FIG. 66, by inputting a reset signal (GRS) to the scanning signal line driving circuit, the scanning of the scanning signal line driving circuit is stopped halfway and an image is displayed partially in the vertical direction of the screen. I have. At this time, similarly to the above, during the period when the scanning signal line driving circuit stops operating,
Since it is not used for display, the operation and signal input of the scanning signal line driving circuit (GCK, GEN, etc.) and the operation and signal input of the data signal line driving circuit (SCK, SST, DAT, etc.)
It is also desirable to stop it.

As a structure for stopping the scanning of the scanning signal line driving circuit halfway, as shown in FIG. 67, a plurality of flip-flops F forming a scanning portion of the scanning signal line driving circuit are provided.
The reset signal GRS is input to each of the Fs.

FIG. 68 is a diagram showing a circuit configuration of a flip-flop portion. The input of the reset signal GRS forces the internal node to a high potential.

FIG. 69 is a timing chart in the case where the method of stopping the drive circuit halfway by the reset signal is applied to the data signal line drive circuit. The scanning circuit partial configuration of the driving circuit is the same as that shown in FIGS. 67 and 68. In FIG. 69, when the reset signal SRS is input, the operation of the data signal line driving circuit stops, and no video signal is written to the subsequent data signal lines. Therefore, since the video signal written before that is held, it is desirable to write non-display video data to the data signal line before entering this partial display mode.

As a configuration for stopping the scanning of the data signal line driving circuit halfway, as shown in FIG. 70, a reset signal SRS is applied to each of a plurality of flip-flops FF constituting a scanning section of the data signal line driving circuit. To be entered.

FIG. 71 is a diagram showing a circuit configuration of a flip-flop portion. The input of the reset signal SRS forces the internal node to a high potential.

In FIG. 72, by inputting a start signal (GST) from a middle stage of the scanning signal line driving circuit, scanning of the scanning signal line driving circuit is started from the middle and a part of the scanning signal line driving circuit in the vertical direction of the screen is started. Image is displayed.
Also in this case, as in the above, during the period in which the operation of the scanning signal line driving circuit is stopped, the scanning signal line driving circuit is not used for display.
And data signal line drive circuit operation and signal input (SC
K, SST, DAT, etc.) are also desirably stopped.

As shown in FIG. 73, a configuration for starting the scanning of the scanning signal line driving circuit in the middle is such that the start signal GST can be input from the first stage and the middle stage of the scanning signal line driving circuit. In some cases, this is controlled by a control switch TG using a full-stage drive control signal GFD and a partial drive control signal GPD.

FIG. 74 is a timing chart in the case where the method of inputting data from an intermediate stage by a start signal is applied to a data signal line driving circuit. The configuration of the scanning circuit of the driving circuit is the same as that shown in FIG. Figure 74
In, until the start signal SST is input,
The operation of the data signal line driving circuit stops, and no video signal is written to the data signal line. Therefore, since the video signal written before that is retained, it is desirable to write non-display video data to the data signal line before entering this partial display mode.

As shown in FIG. 75, a configuration for starting the scanning of the data signal line driving circuit from the middle is such that the start signal SST can be input from the first stage and the middle stage of the data signal line driving circuit. In some cases, this is controlled by a control switch TG using a full-stage drive control signal SFD and a partial drive control signal SPD.

It is also possible to combine the components relating to the partial display described above. Thereby, the degree of freedom for the display area is increased, for example, partial display can be performed in both the horizontal direction and the vertical direction.

FIG. 76 is a diagram showing another configuration example of the image display device according to the present invention. In the image display device shown in FIG. 76, the pixel PIX and the data signal line driving circuit S
D1 and SD2 and the scanning signal line driving circuit GD are formed on the same substrate SUB (driver monolithic structure), and a signal from an external timing circuit CTL and an external video signal processing circuit VID and an external power supply Circuit V
It is driven by a drive power supply from the GEN. In addition,
In the figure, COM is a common terminal. In such a configuration, by forming the data signal line driving circuit (and, in some cases, the scanning signal line driving circuit) on the same substrate as the pixels (in a monolithic manner), rather than separately configuring and mounting the pixels, The manufacturing cost and the mounting cost of the driving circuit can be reduced, and the reliability is also improved.

FIG. 77 is a view showing a structural example of a polycrystalline silicon thin film transistor as an active element constituting the image display device according to the present invention. The polycrystalline silicon thin film transistor includes a polycrystalline silicon thin film including a channel region 102a, a source region 102b, and a drain region 102c formed on a glass substrate 100, and a gate insulating film 10 sequentially deposited on the polycrystalline silicon thin film.
3, a gate electrode 104, an interlayer insulating film 105, and a metal wiring 106.

The polycrystalline silicon thin film transistor shown in FIG. 77 has a forward stagger (top gate) structure using a polycrystalline silicon thin film on an insulating substrate as an active layer.
The present invention is not limited to this, and may have another structure such as an inverted stagger structure.

By using the above-described polycrystalline silicon thin film transistor, a scanning signal line driving circuit and a data signal line driving circuit having practical driving capabilities are formed on the same substrate as the pixel array in almost the same manufacturing steps. can do.

In general, a polycrystalline silicon thin film transistor has lower characteristics than a single crystal silicon transistor (MOS transistor) and therefore has to be driven at a higher voltage. The parasitic capacitance increases. Therefore, power consumption tends to increase, and a technique for reducing power consumption as in the present invention is extremely effective.

FIG. 78 is an example of a structural sectional view showing a manufacturing process of a polycrystalline silicon thin film transistor constituting an image display device according to the present invention. Hereinafter, a manufacturing process for forming a polycrystalline silicon thin film transistor at 600 ° C. or lower will be briefly described.

FIGS. 78A to 78K are cross-sectional views in each step. In FIG. 78, first, a is an amorphous silicon thin film a deposited on the glass substrate 100 (a).
Excimer laser is irradiated to -Si (b) to form a polycrystalline silicon thin film (poly-Si) 102 (c). Next, the polycrystalline silicon thin film 102 is patterned into a desired shape (d), and a gate insulating film 103 made of silicon dioxide is formed (e). After the gate electrode 104 of the thin film transistor is formed of aluminum or the like (f), impurities (phosphorus in the n-type region and boron in the p-type region) are implanted into the source / drain regions of the thin film transistor (g, h). That is, an n-type region 111 and a central region 112 surrounded by the n-type region 111 are formed by phosphor cation doping (g), and the p-type region 11 is formed by boron anion doping.
3 and a central region 114 surrounded by the layer 3 are formed (h).
When implanting impurities into the n-type region, the p-type region is masked with resist 108 (g), and when implanting impurities into the p-type region, the n-type region is masked with resist 108 (h). Thereafter, an interlayer insulating film 105 made of silicon dioxide or silicon nitride is deposited (i), a contact hole 105a is opened (j), and a metal wiring 106 of aluminum or the like is formed (k). In this process,
The maximum temperature of the process is 600 ℃ when forming the gate insulating film.
Therefore, a highly heat-resistant glass such as Corning 1737 glass can be used.

In the liquid crystal display device, a transparent electrode (in the case of a transmission type liquid crystal display device) and a reflection electrode (in the case of a reflection type liquid crystal display device) are further formed after this through another interlayer insulating film. Will do.

Here, in a manufacturing process as shown in FIG.
By forming a polycrystalline silicon thin film transistor at a temperature of 600 degrees Celsius or less, a low-cost and large-area glass substrate can be used, so that the cost and the area of the image display device can be reduced.

FIG. 79 is a block diagram showing a configuration of an electronic apparatus having the above-described image display device. In this example,
The electronic device includes a communication unit, a detection unit, an input unit, a calculation unit, a display unit, and a storage unit. Hereinafter, a specific configuration example of the electronic device will be described.

FIGS. 80 to 82 are diagrams showing examples of the electronic equipment of the present invention. In FIG. 80, the electronic device (television receiver) can be driven by either a built-in battery or an external AC power supply. When the built-in battery is used (a), the use time is limited. Therefore, it is desirable to display in a mode or format that consumes as little power as possible. Also, when the AC power supply is used (b), there is no such restriction, and it is desirable that the display be as high in display quality as possible.

FIG. 81 shows a state of the electronic device (portable telephone) in a standby state and a state in use. At the time of standby (a), character information is mainly used, and black and white binary display with low power consumption does not often cause a problem. On the other hand, at the time of use (b), since image data may be handled, it is desirable to perform color display or gradation display accordingly. In some electronic devices, the standby time is much longer than the usage time.In such a case, reducing the power consumption during the standby time significantly improves the battery life. You.

The electronic device (portable information terminal) shown in FIG.
Includes an optical sensor 201. The sensor detects ambient brightness, and automatically selects the reflective display mode when external light is strong, and automatically selects the transmissive display mode when external light is weak.

FIGS. 83 to 92 show another example of the electronic apparatus of the present invention.

FIG. 83 shows a portable information terminal,
2, display unit 203, operation unit 204, audio output unit 205,
The display unit 20 includes a built-in battery 206 and the like.
The image display device described above can be applied to the third embodiment.

FIG. 84 shows a mobile phone,
11, display unit 212, operation unit 213, audio output unit 21
4, an audio input unit 215, an antenna 216, a built-in battery 217, and the like, and the above-described image display device can be applied to the display unit 212.

FIG. 85 shows a game machine.
21, display unit 222, operation unit 223, audio output unit 22
4. The storage unit includes a storage medium insertion unit 225, a built-in battery 226, and the like, and the above-described image display device can be applied to the display unit 222.

FIGS. 86 (a) and 86 (b) show video cameras, each of which includes a main body 231/241, an imaging section 232/242, a voice input section 243, and a display section 234.
244, operation units 235 and 245, storage medium insertion unit 23
6, 246, a built-in battery 237, and the like, and the above-described image display device can be applied to the display units 234, 244.

FIG. 87 shows a still camera, which includes a main body 251, an image pickup section 252, a display section 253, and an operation section 25.
4, a storage medium insertion unit 255, a built-in battery 256, and the like, and the above-described image display device can be applied to the display unit 253.

FIG. 88 shows an electronic book, and the main body 2
61, display unit 262, operation unit 263, storage medium insertion unit 2
64, a built-in battery 265, and the like, and the above-described image display device can be applied to the display unit 262.

FIG. 89 shows a car navigation system including a main body 271a / 271b, a display section 272,
Audio output unit 273, operation unit 274, storage medium insertion unit 27
5. The display unit 272 includes the above-described image display device.

FIG. 90 shows a television receiver, which includes a main body 281, a display unit 282, an audio output unit 283, and an operation unit 2.
84, an antenna 285, an input / output terminal 286, a built-in battery 287, and the like, and the above-described image display device can be applied to the display portion 282.

FIG. 91 shows a video playback device, which includes a main body 291, a display unit 292, an audio output unit 293, and an operation unit 2.
94, a storage medium insertion unit 295, an input / output terminal 296, a built-in battery 297, and the like, and the above-described image display device can be applied to the display unit 292.

FIG. 92 shows a computer including a main body 301, a display section 302, a sound output section 303, and an operation section 3.
04, an input / output terminal 305, a storage medium insertion unit 306, a built-in battery 307, and the like, and the above-described image display device can be applied to the display unit 302.

As described above, the present invention can be applied to a very wide variety of electronic devices, and the display section of the electronic device can be visually recognized by selecting an optimum display mode and display format according to the use environment and use condition. The operability, operability, and convenience can be improved.

[0316] Although some configuration examples of the present invention have been described above, the present invention is not limited to these, and the same applies to other configurations such as combinations of the above configuration examples.

[0317] The image display device of the present invention comprises a pixel array composed of a plurality of pixels for displaying an image, a data signal line driving circuit for supplying a video signal to the pixel array, and writing of a video signal to the pixel. A scanning signal line driving circuit, a data signal line driving circuit, a timing circuit for supplying a timing signal to the scanning signal line driving circuit, a video signal processing circuit for supplying a video signal to the data signal line driving circuit, And a plurality of the data signal line drive circuits, wherein the plurality of data signal line drive circuits have different configurations from each other and can drive the same region of a pixel array. May be configured.

Further, the image display device of the present invention may be configured such that only one of the plurality of data signal line driving circuits operates at each time in the above configuration. .

[0319] Further, the image display device of the present invention may be arranged such that the same data signal line driving circuit is driven at least in the same frame period.

[0320] Further, the image display device of the present invention may be arranged such that the data signal line drive circuit to be driven is switched within the same frame period.

Further, in the image display device of the present invention, in the above configuration, at least any two of the plurality of data signal line drive circuits may be configured to write image data to different areas in a screen. Good.

In the image display device of the present invention, in the above configuration, at least any two of the plurality of data signal line drive circuits may include image data in at least a part of the screen within the same frame period. May be written.

Further, the image display device of the present invention may be arranged such that at least any two of the plurality of data signal line driving circuits operate simultaneously at the same time.

[0324] In the image display device of the present invention, in the above configuration, at least one of the plurality of data signal line drive circuits is written by another data signal line drive circuit within the same frame period. The image data may be written over the image.

[0325] In the image display device of the present invention, at least one of the plurality of data signal line drive circuits may be configured to overwrite an image in units of a horizontal scanning period. .

In the image display device of the present invention, in the above configuration, at least one of the plurality of data signal line driving circuits overwrites an image only in a part of each horizontal scanning period. It may be configured as follows.

[0327] In the image display device of the present invention, in the above configuration, at least one of the plurality of data signal line driving circuits writes image data within a retrace period of each horizontal scanning period. May be.

[0328] In the image display device of the present invention, in the above structure, at least one of the plurality of data signal line driving circuits writes image data with a certain period of time delay from the other data signal line driving circuits. It may be configured as follows.

In the image display device of the present invention, the plurality of data signal line drive circuits may be arranged on opposite sides of the pixel array in the above configuration.

In the image display device of the present invention, the plurality of data signal line driving circuits may be arranged on the same side with respect to the pixel array in the above configuration.

In the image display device of the present invention, the plurality of data signal line driving circuits may be configured such that some of the circuits are common to the plurality of data signal line driving circuits.

The image display device of the present invention has a pixel array composed of a plurality of pixels for displaying an image, a data signal line driving circuit for supplying a video signal to the pixel array, and writing of a video signal to the pixel. A scanning signal line driving circuit, a data signal line driving circuit, a timing circuit for supplying a timing signal to the scanning signal line driving circuit, a video signal processing circuit for supplying a video signal to the data signal line driving circuit, Wherein at least a part of the scanning signal line driving circuit is provided, the plurality of scanning signal line driving circuits have different configurations from each other, and can drive the same region of a pixel array. May be configured.

Further, the image display device of the present invention may be arranged such that only one of the plurality of scanning signal line driving circuits operates at each time in the above configuration. .

[0334] Further, the image display device of the present invention may be arranged such that the same scanning signal line driving circuit is driven in at least the same frame period.

Further, the image display device of the present invention may be arranged such that the scanning signal line driving circuit to be driven is switched within the same frame period in the above configuration.

In the image display device of the present invention, at least any two of the plurality of scanning signal line driving circuits may be configured to write image data to different areas in a screen. Good.

In the image display device of the present invention, the plurality of scanning signal line driving circuits may be arranged on opposite sides of the pixel array in the above configuration.

In the image display device of the present invention, the plurality of scanning signal line driving circuits may be arranged on the same side of the pixel array in the above configuration.

In the image display device of the present invention, the plurality of scanning signal line driving circuits may be configured such that some of the circuits are common to the plurality of scanning signal line driving circuits.

Further, the image display device of the present invention may be arranged such that, in the above configuration, which of the plurality of data signal line driving circuits is driven by a signal input from the outside. .

Further, the image display device of the present invention may be arranged such that, in the above configuration, which of the plurality of scanning signal line driving circuits is driven by a signal input from the outside. .

The image display device of the present invention may be arranged such that any one of a plurality of display modes and display formats is selected according to the type of display data to be input.

Further, the image display device of the present invention may be configured such that any one of a plurality of display modes and display formats is selected according to a use environment in the above-described configuration.

[0344] In the image display device of the present invention, the video signal processing circuit may have a function of converting an input video signal into a plurality of types of formats.

In the image display device of the present invention, the timing circuit may have a function of converting an input timing signal into a signal corresponding to a display format.

The image display device of the present invention may be arranged such that in the above configuration, the timing circuit includes a means for receiving a control signal from the outside and switching a supply destination of the timing signal.

[0347] Further, the image display device of the present invention may be arranged so that, in the above configuration, the video signal processing circuit includes means for switching a supply destination of the video signal in response to an external control signal. Good.

[0348] The image display apparatus of the present invention, in the above-described configuration, includes means for detecting a use environment and means for switching a display mode or a display format based on a signal from the detection means. You may.

The image display apparatus of the present invention, in the above-mentioned configuration, includes a discriminating means for discriminating a type and a format of an input video signal, and a means for switching a display mode and a display format based on a signal from said discriminating means. May be provided.

In the image display apparatus of the present invention, the plurality of data signal line drive circuits or the plurality of scan signal line drive circuits have independent power supply terminals and input terminals. You may.

In the image display device of the present invention, the plurality of data signal line driving circuits or the plurality of scanning signal line driving circuits have a common power supply terminal and a part of an input terminal. It may be configured as follows.

In the image display apparatus of the present invention, the plurality of data signal line drive circuits or the plurality of scan signal line drive circuits may be configured to supply power to a non-operating drive circuit. May be configured to be stopped.

In the image display device of the present invention, in the above configuration, the plurality of data signal line driving circuits or the scanning signal line driving circuits electrically connect a driving circuit and a pixel array which are not used for display. It may be configured so as to include a means for separating electrically.

In the image display device of the present invention, the plurality of display formats may be configured so that one of the display formats has higher image quality than the other.

In the image display device of the present invention, the plurality of display formats may be configured such that one of the plurality of display formats has lower power consumption than the other.

In the image display device of the present invention, the plurality of display formats may be configured so that one of the display formats has a higher display resolution than the other.

In the image display device of the present invention, the plurality of display formats may be configured such that one is a color display and the other is a monochrome display.

Further, the image display device of the present invention may be arranged such that one of the plurality of data signal line driving circuits writes the same image data to the plurality of data signal lines.

In the image display device of the present invention, one of the plurality of data signal line driving circuits writes the same image data to data signal lines corresponding to a plurality of pixels of the same color that are continuous in the horizontal direction. You may comprise.

In the image display device of the present invention, in one of the plurality of data signal line driving circuits, the same image data is written to data signal lines corresponding to a plurality of pixels of three consecutive colors in the horizontal direction. You may comprise.

In the image display device of the present invention, a scanning signal is written into a plurality of continuous scanning signal lines at different timings, and the same image data is output from the data signal line driving circuit in each scanning period. May be configured.

In the image display device of the present invention, a scanning signal is written into a plurality of continuous scanning signal lines at different timings and output from the data signal line driving circuit during a period including a plurality of scanning periods. The image data may be configured to be held in each data signal line.

In the image display device of the present invention, a scanning signal is written to a plurality of continuous scanning signal lines at different timings, and during each scanning period, the same signal having a different polarity is supplied from the data signal line driving circuit. The image data corresponding to the key may be output.

The image display device of the present invention may be configured so that the image data written to each data signal line has the same polarity during one frame period.

In the image display device of the present invention, one of the plurality of display formats may be configured so that one of the display formats has a larger number of display gradations than the other.

In the image display device of the present invention, one of the plurality of display formats may correspond to a halftone display and the other may be a binary display.

Further, the image display device of the present invention, in the above configuration, includes a reference voltage selection circuit and an intermediate potential generation circuit in the data signal line drive circuit. Only the reference voltage selection circuit may be operated, and the intermediate potential generation circuit may not be operated. On the other hand, when there are many display gradations, both the reference voltage selection circuit and the intermediate potential generation circuit may be operated. .

In the image display device of the present invention having the above structure, an amplifier circuit is provided in the data signal line driving circuit. When the display gradation is small, the amplifier circuit does not operate. When the number of gradations is large, the amplifier circuit may be operated.

[0369] Further, the image display device of the present invention may be arranged such that one of the input video signals is an analog signal and the other is a digital signal in the plurality of display formats. Good.

[0370] Further, the image display device of the present invention may be arranged such that one of the input video signals is image data and the other is text data in the plurality of display formats. Good.

In the image display device of the present invention, in the above configuration, in the plurality of display formats, the input video signal is configured such that one is natural picture data and the other is graphic data. Is also good.

In the image display apparatus of the present invention, one of the plurality of display modes may be a transmissive display mode and the other may be a reflective display mode.

Further, the image display device of the present invention is configured such that image data is not written in at least a part of the display area in any of the above-mentioned driving circuits provided at least in part. May be.

Further, the image display device of the present invention controls the output of the drive circuit by using the signal corresponding to the drive timing of each signal line, so that the image data is not written in a partial area. May be.

Further, the image display device of the present invention uses the reset signal for stopping the scanning of the driving circuit by using a reset signal.
By controlling the output of the drive circuit, the image data may not be written to some areas.

In the image display device of the present invention, a start signal for starting scanning of the driving circuit is inputted from an intermediate stage of the scanning circuit in the driving circuit, so that image data is stored in a partial area. May not be written.

In the image display device of the present invention, in the above configuration, at least one of the data signal line driving circuit and the scanning signal line driving circuit is formed on the same substrate as the pixels. You may.

[0378] In the image display device of the present invention, in the above configuration, the active element forming at least one of the data signal line driving circuit and the scanning signal line driving circuit may be:
It may be configured to be a polycrystalline silicon thin film transistor.

[0379] In the image display device of the present invention, in the above structure, the active element may be formed on a glass substrate at 600 ° C.
You may comprise so that it may be formed by the following processes.

[0380] Further, the electronic apparatus of the present invention may be configured such that, in an electronic apparatus provided with an image display device as an output device, the image display device is any one of the above image display devices.

In the electronic device of the present invention, the display mode or the display format is switched between a period driven by an external power supply and a period driven by a built-in battery. Is also good.

In the electronic device of the present invention, the display mode or the display format may be switched between the standby mode and the operation mode.

[0383] In the electronic device of the present invention, the display mode or the display format may be switched in accordance with the peripheral brightness during use.

Also, the electronic device of the present invention is configured to be a portable information terminal, a mobile phone, a game machine, a video camera, a still camera, an electronic book, a navigation system, a television receiver, a video reproducing device, and a computer. May be.

As described above, the image display device of the present invention is provided with a plurality of differently configured data signal line driving circuits and scanning signal line driving circuits. Then, each data signal line driving circuit or scanning signal line driving circuit has a displayable format (resolution, display gradation, etc.).
Are different. Therefore, display quality and power consumption during operation differ depending on which drive circuit is selected. Depending on the type of input video and usage environment,
By switching the driving circuit to be operated, display in an optimal (necessary and sufficient) display format becomes possible, and power consumption is also reduced.

Also, by writing a video signal to a signal line with a time difference using a plurality of driving circuits, an image can be overwritten. Therefore, superimposition can be performed without externally processing the video signal. Display becomes possible.

In the electronic device equipped with the image display device, the display quality, the usable time, and the like can be optimized, so that the visibility, the operability, and the convenience are improved. As described above, according to the present invention, it is possible to achieve both good image display and low power consumption in the image display device.

[0388]

As described above, the image display apparatus according to the present invention includes a plurality of at least a part of at least one of the data signal line driving circuit and the scanning signal line driving circuit. , The driving circuits have different display forms.

Thus, a data signal line driving circuit and a scanning signal line driving circuit suitable for a plurality of display formats are provided in advance and operated according to the user's request, the type of input signal, and the surrounding environment. By selecting the data signal line drive circuit, it is possible to display an image in a format suitable for the purpose.

In the image display device of the present invention, in addition to the above-described structure, only one of the driving circuits, at least one of which is provided with a plurality of parts, operates at each time. The configuration is as follows.

Accordingly, in order to display an image in a certain format, the other driving circuits of the plurality of driving circuits are irrelevant to the display, and the operations of these driving circuits are stopped, thereby making the above-mentioned operation possible. In addition to the effects of the above configuration, there is an effect that power consumption can be reduced.

The image display device of the present invention has a structure in which, in addition to the above structure, the same drive circuit is driven at least in the same frame period with respect to the at least one part of the drive circuit. .

By driving the same driving circuit during the same frame period,
It is possible to display an image in an optimal format according to the type of the image. Therefore, in addition to the effects of the above-described configuration, there is an effect that both high image quality and low power consumption can be realized.

[0394] In addition to the above configuration, the image display device of the present invention has a configuration in which the driving circuit for driving at least a part of the driving circuit is switched within the same frame period.

As a result, even when different types of images are displayed on one screen, it is possible to display images in an optimal format in each area in the screen. Thus, it is possible to achieve both high image quality and low power consumption.

[0396] In the image display device of the present invention, in addition to the above structure, at least two of the driving circuits each having at least a part thereof are provided in different regions on the screen. This is a configuration for writing data.

As a result, even when different types of images are displayed on one screen, it is possible to display images in an optimal format in each area of the screen. Thus, it is possible to achieve both high image quality and low power consumption.

[0398] Further, in addition to the above configuration, the image display device of the present invention includes a plurality of at least a part of the data signal line drive circuit, and at least two of the data signal line drive circuits are provided within the same frame period. , The image data is written in at least a part of the same area in the screen.

Thus, it is possible to overwrite another image data on the same display area after writing certain image data without using an external image processing circuit. And this
This has the effect of simplifying the system, reducing costs, and reducing power consumption.

[0400] The image display device of the present invention has a configuration in which at least two of the plurality of data signal line drive circuits operate simultaneously in addition to the above configuration.

Thus, by operating a plurality of driving circuits simultaneously, image data from any of the data signal line driving circuits can be displayed. Therefore, in addition to the effect of the above configuration, one screen can be displayed. This has the effect of realizing the display of images in different formats and the overwriting of images.

[0402] In addition to the above configuration, at least one of the plurality of data signal line drive circuits is written by another data signal line drive circuit within the same frame period. This is a configuration in which image data is written over an overwritten image.

[0403] Thus, it is possible to realize image synthesis without an external image processing circuit. Therefore, in addition to the effects of the above-described configuration, it is possible to simplify the system, reduce the cost, and reduce the power consumption.

[0404] In addition to the above configuration, at least one of the plurality of data signal line driving circuits is configured to overwrite an image in units of a horizontal scanning period.

As a result, the image can be overwritten in units of the horizontal scanning period. Therefore, in addition to the effect of the above-described configuration, there is an effect that the driving of the data signal line driving circuit that controls overwriting can be simplified. .

[0406] In the image display device of the present invention, in addition to the above configuration, at least one of the plurality of data signal line driving circuits may overwrite an image only in a part of each horizontal scanning period. Configuration.

Thus, by overwriting the image only in a part of the horizontal scanning period, the overwriting is performed only on the white (or black) part of the character, and the gap is not overwritten. And therefore
In addition to the effects of the above configuration, there is an effect that superimposition of characters can be performed.

[0408] In addition to the above configuration, the image display device of the present invention includes a plurality of at least a part of the data signal line drive circuits, and at least one of the plurality of data signal line drive circuits has a horizontal The configuration is such that image data is written within a retrace period of the scanning period.

Thus, the data signal line driving circuit writes the image data in the retrace period of each horizontal scanning period, and in addition to the effect of the above configuration, the image signal is already written to the data signal line corresponding to the display area. There is an effect that image data can be overwritten without any problem even when data is written.

[0410] In addition, in addition to the above configuration, the image display device of the present invention further includes at least a part of the data signal line driving circuit, and at least one of the plurality of data signal line driving circuits is connected to another data signal line driving circuit. The configuration is such that image data is written after a certain period of time behind the data signal line driving circuit.

[0411] With this arrangement, a certain data signal line driving circuit writes image data after a certain period of time behind another data signal line driving circuit. There is an effect that the image data can be overwritten without any problem even when the image data is already written on the line.

[0412] In the image display device of the present invention, in addition to the above-described structure, the drive circuit having at least a part thereof is provided on the opposite side to the pixel array with respect to the pixel array. Configuration.

[0413] Thus, when a plurality of drive circuits are provided, by disposing them on both sides of the pixel array, there is an effect that this space can be effectively used in addition to the effect of the above configuration.

[0414] In the image display device of the present invention, in addition to the above-described structure, the drive circuit having at least a part thereof is arranged on the same side as the pixel array. Configuration.

By arranging a plurality of drive circuits on the same side with respect to the pixel array (screen area), signal wirings can be grouped. In addition to the effects of the above configuration, This has the effect that the overall size can be reduced.

Further, since the signal input terminal, the power supply terminal, and the like can be brought close to any of the drive circuits, in addition to the effects of the above-described configuration, signal delay and waveform distortion due to long-distance wiring, etc. Is achieved.

[0417] In addition to the above configuration, the image display device of the present invention has a configuration in which at least a part of the driving circuit has a common part of the driving circuits. It is.

Thus, even when a plurality of components include different driving circuits, some of them may adopt the same circuit configuration. Therefore, in addition to the effects of the above-described configuration,
In such a case, by sharing a part of the circuits among a plurality of driving circuits, an effect is obtained that the circuit scale can be reduced.

[0419] In addition to the above-described structure, the image display device of the present invention may be configured such that any one of the plurality of driving circuits is driven by an externally input signal. Is controlled.

[0420] Thus, only one drive circuit actually drives the pixel array, and it is useless to drive a drive circuit that does not contribute to display. Therefore, only the drive circuit that controls display operates. By controlling with an external signal, power consumption can be suppressed in addition to the effect of the above configuration.

[0421] In addition to the above configuration, the image display apparatus of the present invention is configured to select any one of the above-mentioned different display modes according to the type of input display data.

Thus, by providing a plurality of drive circuits and changing the display mode and display format according to the type of video to be displayed, in addition to the effects of the above-described configuration, the display data to be input (display This is effective in that display and driving optimized for the type of image to be performed can be performed.

Further, the image display device of the present invention has a configuration in which one of the above-mentioned different display modes is selected according to the use environment in addition to the above-mentioned configuration.

[0424] Thus, the display mode is switched according to the environment such as the surrounding brightness, and the display format is further switched according to the display mode.
In addition to the effect of the above configuration, there is an effect that it is possible to achieve both easy-to-view images and low power consumption.

[0425] In the image display apparatus of the present invention, in addition to the above configuration, the video signal processing circuit converts the input video signal into a plurality of types of display formats having different display formats. It is a configuration to do.

Thus, by converting the video data into a format corresponding to the type of the video and supplying it to the data signal line driving circuit, in addition to the effect of the above-described configuration, various data input to the image display device can be obtained. There is an effect that it is possible to correspond to different types of video data.

Further, in the image display device of the present invention, in addition to the above configuration, the timing circuit may convert the input timing signal into a signal corresponding to a display format as a display format different from the above. It is.

Thus, by converting an original timing signal such as a synchronizing signal or an original clock signal into a plurality of types of timing signals corresponding to the display format, in addition to the effect of the above-described configuration, the type of video and the This provides an effect that it is possible to satisfactorily cope with a case where display is performed by changing a display resolution, a frame frequency, or the like depending on a surrounding environment.

Further, in the image display device of the present invention, in addition to the above configuration, the timing circuit includes timing signal supply destination switching means for receiving a control signal from the outside and switching a supply destination of the timing signal. Configuration.

As a result, unnecessary supply of the timing signal can be stopped, so that, in addition to the effects of the above-described configuration, malfunctions due to noise and the like can be prevented and power consumption can be reduced.

[0431] In the image display apparatus of the present invention, in addition to the above configuration, the video signal processing circuit may further include a video signal supply destination switching means for switching a supply destination of the video signal in response to an external control signal. It is a configuration provided.

As a result, unnecessary supply of the video signal can be stopped, so that in addition to the effects of the above-described configuration, there is an effect that malfunction due to noise or the like is prevented and power consumption is reduced.

The image display apparatus of the present invention further comprises, in addition to the above configuration, detection means for detecting a use environment, and display mode switching means for switching the display mode based on a signal from the detection means. It is a configuration to do.

Thus, it is possible to automatically select and switch the optimum display mode and display format by recognizing the use environment. In addition to the effects of the above configuration, the user himself controls the device. This has the effect of eliminating the need to perform

Further, in addition to the above configuration, the image display apparatus of the present invention further comprises a video type determining means for determining the type of an input video signal, and the display mode based on a signal from the video type determining means. And a display mode switching unit for switching the display mode.

As a result, it is possible to automatically select and switch the optimum display mode and display format corresponding to the type of video. In addition to the effects of the above-described configuration, the user can control the device by himself / herself. There is an effect that there is no need to perform.

[0437] In addition to the above-described structure, the image display device of the present invention has a structure in which at least a part of the drive circuit is provided with independent power supply terminals and independent input terminals. is there.

With this arrangement, when the driving circuits are arranged on both sides of the pixel array, by providing independent power supply terminals and input terminals, signal lines and power supply lines are less likely to intersect each other. In addition to the above-described effects, it is possible to suppress an operation failure or a display failure due to noise or the like due to capacitive coupling.

[0439] In the image display device of the present invention, in addition to the above-described configuration, the drive circuit of which at least a part is provided includes a power supply terminal and a part of an input terminal. Configuration.

Thus, by sharing the same signal terminal and the same voltage power supply terminal, in addition to the effects of the above configuration, the number of terminals can be reduced, and external signal switching and power supply switching can be simplified. This has the effect of being achieved.

[0441] In addition to the above configuration, the image display device of the present invention further includes, in addition to the above-described configuration, at least one of the plurality of driving circuits, the driving circuit that is not operating among the driving circuits includes: This is a configuration in which power supply is stopped.

[0442] Thus, a configuration is provided in which an independent power supply terminal is provided for each of the plurality of drive circuits, and the power supply to the power supply terminals corresponding to the inoperable drive circuits is stopped, whereby the effect of the above configuration can be obtained. In addition, there is an effect that power consumption due to a leak current or the like can be eliminated.

[0443] In addition to the above configuration, the image display device of the present invention may further comprise, of the above-mentioned drive circuit, at least a part of which is provided, of the drive circuit which is not used for display and the pixel array. And a driving circuit separating means for electrically separating the driving circuit from the driving circuit.

Thus, by providing a means for electrically disconnecting the pixel array from the drive circuit which is not used for display, it is possible to obtain an image display device capable of excellent display in addition to the effect of the above configuration. This has the effect that it can be performed.

Further, the image display device of the present invention has, in addition to the above-described configuration, one of the plurality of display formats as different display forms described above, one of which has higher image quality than the other.

[0446] Thus, a plurality of formats can be displayed. In addition to the effects of the above-described configuration, it is possible to select a display mode and a display format suitable for the type of display data and the use environment. It has the effect of being able to.

The image display device of the present invention has, in addition to the above-described configuration, a configuration in which one of the display formats has a lower power consumption than the other as a plurality of display formats as different display modes.

Thus, by selecting a display method and a driving method that are optimal for the type of image and the surrounding environment, it is possible to optimize the power consumption in addition to the effect of the above configuration. It works.

Further, the image display device of the present invention has a configuration in which one of the plurality of display formats has a higher display resolution than the other in addition to the above configuration.

Thus, by simultaneously inputting the same signal to a plurality of data signal line driving lines or a plurality of scanning signal line driving lines, it is possible to reduce the number of units of a driving circuit operating at the time of low resolution display. Therefore, in addition to the effects of the above configuration, in low-resolution display, the scale of the operation circuit is reduced, the number of wirings is reduced, and the driving frequency is reduced.
This has the effect of reducing power consumption of the image display device.

The image display device of the present invention has a configuration in which one of the plurality of display formats is a color display and the other is a black and white display, in addition to the above configuration.

Thus, by simultaneously inputting the same signal to a plurality of data signal line drive lines, the number of drive circuit units that operate during monochrome display can be reduced. Thus, in the monochrome display, the size of the operation circuit can be reduced and the number of wires can be reduced, so that the power consumption of the image display device can be reduced.

[0453] In addition to the above configuration, the image display device of the present invention further includes a plurality of at least a part of the data signal line driving circuit, and at least one of the plurality of data signal line driving circuits includes a plurality of data signal line driving circuits. In this configuration, the same image data is written to a data signal line.

As a result, the number of outputs of the data signal line driving circuit is reduced, so that the circuit scale of the data signal line driving circuit is reduced, and the number or frequency of the data signal and the clock signal is also reduced. Therefore, in addition to the effect of the above configuration, there is an effect that power consumption in the data signal line driving circuit can be reduced.

[0455] In addition to the above configuration, the image display device of the present invention further includes at least a part of the data signal line drive circuit, wherein at least one of the plurality of data signal line drive circuits has a horizontal direction. And the same image data is written to data signal lines corresponding to a plurality of pixels of the same color that are successive to the image data.

As a result, the number of outputs of the data signal line drive circuit is reduced, so that the circuit scale of the data signal line drive circuit is reduced, and the number or frequency of the data signal and the clock signal is also reduced. Therefore, in addition to the effect of the above configuration, there is an effect that power consumption in the data signal line driving circuit can be reduced.

[0457] In addition to the above configuration, the image display device of the present invention further includes at least a part of the data signal line drive circuit, wherein at least one of the plurality of data signal line drive circuits has a horizontal direction. And the same image data is written to data signal lines corresponding to a plurality of pixels of three consecutive colors.

As a result, the number of outputs of the data signal line drive circuit is reduced to 1/3, so that the circuit scale of the data signal line drive circuit is reduced, and the number or frequency of data signals and clock signals is also reduced. Therefore, in addition to the effect of the above configuration, there is an effect that power consumption in the data signal line driving circuit can be reduced.

Further, in the image display device of the present invention, in addition to the above configuration, in the display format having the lower display resolution, the scanning signals are written to the plurality of continuous scanning signal lines at different timings. During the scanning period, the same image data is output from the data signal line driving circuit.

Thus, during the scanning period corresponding to a plurality of continuous scanning signal lines, the same image data is written to the data signal lines, and the same image data is displayed by pixels that are consecutive in the vertical direction. Therefore, in addition to the effect of the above configuration, there is an effect that display can be performed at a resolution lower than the physical resolution of the image display device.

In the image display device of the present invention, in addition to the above configuration, in a display format having a lower display resolution, a scanning signal is written to a plurality of continuous scanning signal lines at different timings. , The image data output from the data signal line driving circuit is held in each data signal line during the period including the scanning period.

As a result, the output cycle of video data from the data signal line drive circuit can be reduced, so that display at a resolution lower than the physical resolution of the image display device can be performed. In addition, the number or frequency of the data signal and the clock signal in the data signal line driving circuit decreases. Therefore, in addition to the effect of the above configuration, there is an effect that power consumption in the data signal line driving circuit can be reduced.

In the image display device of the present invention, in addition to the above-described configuration, in the display format having the lower display resolution, the scanning signals are written to the plurality of continuous scanning signal lines at different timings. During the scanning period, the data signal line driving circuit outputs image data corresponding to the same grayscale having different polarities.

[0464] Thus, in a scanning period corresponding to a plurality of continuous scanning signal lines, image data corresponding to the same grayscale having different polarities is output from the data signal line driving circuit. Therefore, in addition to the effect of the above configuration, in the horizontal line inversion driving method, it is possible to display at a resolution lower than the physical resolution without impairing the display quality.

In the image display device of the present invention, in addition to the above configuration, in a display format having a lower display resolution, image data written to each data signal line has the same polarity during one frame period. Configuration.

As a result, even when image data is held in the data signal lines during the scanning period corresponding to the plurality of scanning signal lines, there is almost no difference in pixel potential fluctuation due to parasitic capacitance between the upper and lower pixels. Therefore, in addition to the effect of the above configuration, it is possible to reduce the power consumption of the data signal line driving circuit without deteriorating the display quality.

The image display device of the present invention has, in addition to the above-described structure, one of the plurality of display formats having a larger number of display gradations than the other.

Thus, one of the plurality of data signal line driving circuits is configured to have a smaller number of displayable gradations than the other, so that in addition to the effect of the above-described configuration, in the case of the small gradation display, Has the effect that the scale of the operation circuit is reduced and the number of wires and terminals is reduced, and the power consumption of the image display device is reduced.

The image display apparatus of the present invention has a configuration in which one of the plurality of display formats corresponds to a halftone display and the other is a binary display in addition to the above configuration.

As a result, different gradations are displayed depending on the type of image to be displayed and the display mode. Therefore, in addition to the effect of the above-described configuration, the power consumption of the image display device can be reduced. To play.

The image display device of the present invention further comprises, in addition to the above configuration, at least a part of the data signal line driving circuit, wherein the data signal line driving circuit includes a reference voltage selection circuit and an intermediate potential. And a generation circuit,
When the display gradation is small, only the reference voltage selection circuit is operated, and the intermediate potential generation circuit is not operated.
When there are many display gradations, the reference voltage selection circuit and the intermediate potential generation circuit are operated together.

As a result, by generating an intermediate potential between the two reference potentials, multi-gradation data can be generated. There is an effect that display can be performed.

[0473] In addition to the above structure, the image display device of the present invention further includes at least a part of the data signal line driving circuit, and an amplifier circuit in the data signal line driving circuit. When the tone is small, the amplifier circuit is not operated, while when the display gradation is large, the amplifier circuit is operated.

Thus, an amplifier circuit is added to the subsequent stage of the intermediate potential generation circuit, and the video data is written to the data signal line using the amplifier circuit.
There is an effect that display can be performed for a plurality of formats.

[0475] Further, in addition to the above configuration, the image display device of the present invention has a configuration in which, in the plurality of display formats, one of the input video signals is an analog signal and the other is a digital signal. .

With this, when the number of display gradations is large,
It is preferable to use the analog drive method. On the other hand, when the number of display gradations is small, the digital drive method can be used. It has the effect that it can be done.

The image display device of the present invention, in addition to the above configuration, has a configuration in which, in the plurality of display formats, one of the input video signals is image data and the other is text data. .

Thus, according to the type of video data,
By switching the input destination of the video data and the driving circuit to be operated, in addition to the effects of the above-described configuration, there is an effect that an optimal display can be realized in terms of display quality and power consumption.

[0479] In addition to the above configuration, the image display apparatus of the present invention has a configuration in which, in the plurality of display formats, one of the input video signals is natural picture data and the other is graphic data. is there.

Thus, according to the type of video data,
By switching the input destination of the video data and the driving circuit to be operated, in addition to the effects of the above-described configuration, there is an effect that an optimal display can be realized in terms of display quality and power consumption.

[0481] In addition to the above configuration, the image display device of the present invention has a plurality of display modes as different display modes, one of which is a transmissive display mode and the other is a reflective display mode. There is a certain configuration.

Thus, by switching the display mode between the transmissive type and the reflective type in accordance with the use environment or the type of video, in addition to the effects of the above-described configuration, the display mode is optimal in terms of display quality and power consumption. This has the effect of realizing a proper display.

Further, in the image display device of the present invention, in addition to the above-described structure, in any of the above-described drive circuits, at least a part of the drive circuit is provided with image data in at least a part of a display area. Is not written.

Thus, during the period corresponding to the image area in which the image data is not written, a part or all of the data signal line driving circuit and the scanning signal line driving circuit, as well as the external control circuit and the video signal processing circuit are used. Can be stopped. Therefore, in addition to the effect of the above configuration, there is an effect that power consumption can be significantly reduced.

[0485] In addition to the above structure, the image display device of the present invention controls the output of the drive circuit by using signals corresponding to the drive timing of each signal line, so that the image is displayed in a partial area. In this configuration, no data is written.

Thus, for example, most of the operation of the drive circuit can be stopped by making the output pulse control signal in the data signal line drive circuit or the scan signal line drive circuit inactive. Therefore, in addition to the effect of the above configuration, there is an effect that power consumption can be significantly reduced.

[0487] In addition to the above structure, the image display device of the present invention controls the output of the driving circuit by using a reset signal for stopping the scanning of the driving circuit, so that a part of the area is controlled. This is a configuration in which image data is not written in the.

Thus, for example, by stopping the clock signal in the data signal line driving circuit or the scanning signal line driving circuit, the operation of the driving circuit can be stopped. Therefore, in addition to the effect of the above configuration, there is an effect that power consumption can be significantly reduced.

[0489] In addition to the above structure, the image display device of the present invention can be configured such that a start signal for starting scanning of a driving circuit is inputted from an intermediate stage of the scanning circuit in the driving circuit. In this configuration, image data is not written in some areas.

Thus, for example, in the data signal line driving circuit or the scanning signal line driving circuit, a configuration is adopted in which a start signal for starting the scanning can be inputted from an intermediate stage. Can be operated only partially. Therefore, in addition to the effect of the above configuration, there is an effect that power consumption can be significantly reduced.

[0492] In addition to the above structure, the image display device of the present invention has a structure in which at least a part of the drive circuit is provided on the same substrate as the pixels. It is.

Thus, a pixel array for performing display and a data signal line driving circuit or a scanning signal line driving circuit for driving pixels can be manufactured on the same substrate in the same step. In addition to the effects of the above configuration, there is an effect that the manufacturing cost and the mounting cost can be reduced and the non-defective product rate can be increased.

[0493] In addition to the above structure, in the image display device of the present invention, in the above drive circuit, at least a part of which is provided, a plurality of active elements constituting the drive circuit are provided.
The configuration is a polycrystalline silicon thin film transistor.

As a result, the pixel and the signal line driving circuit can be easily formed on the same substrate. In addition to the effects of the above configuration, the manufacturing cost and the mounting cost can be reduced and the non-defective product rate can be reduced. The effect that up can be realized is produced.

[0495] In addition to the above structure, in the image display device of the present invention, in the above-described drive circuit, at least a part of which is provided, a plurality of the active elements constituting the drive circuit are disposed on a glass substrate by 600 The structure is formed by a process at a temperature of not more than ℃.

[0496] Thus, glass that is inexpensive and can be easily enlarged can be used as the substrate, and in addition to the effects of the above-described configuration, a large-sized image display device can be manufactured at low cost. This has the effect.

[0497] An electronic apparatus according to the present invention has an image display device as an output device, wherein the image display device is any one of the above image display devices.

[0498] Accordingly, it is possible to achieve both the display quality of the output device and the reduction in power consumption of the entire electronic device, according to the usage state of the electronic device and the surrounding environment.

[0499] In addition to the above-described structure, the electronic device of the present invention has a structure in which a display mode or a display format is switched between a period in which the electronic device is driven by an external power supply and a period in which the device is driven by a built-in battery. is there.

As a result, the display is performed in the display mode or the display format which consumes a large amount of power but is high in quality, so that in addition to the effect of the above configuration, the optimum display corresponding to the use state and the maximization of the usable time are realized. This has the effect that it becomes possible.

[0501] In addition to the above configuration, the electronic apparatus of the present invention has a configuration in which a display mode or a display format is switched between standby and operation.

As a result, high display quality during operation and low power consumption during standby can be realized at the same time. In addition to the effects of the above configuration, the visibility, operability, and convenience of the electronic device can be improved. This has the effect of greatly improving the performance.

[0503] In addition to the above configuration, the electronic apparatus of the present invention has a configuration in which a display mode or a display format is switched according to the peripheral brightness during use.

[0504] Thus, while minimizing power consumption,
It is possible to perform a display that matches the usage environment. Therefore, in addition to the effects of the above-described configuration, there is an effect that the visibility, operability, and convenience of the electronic device are significantly improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of an image display device according to the present invention.

FIG. 2 is a block diagram illustrating another configuration example of the image display device according to the present invention.

FIG. 3 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 4 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 5 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 6 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 7 is a block diagram illustrating another configuration example of the image display device according to the present invention.

FIG. 8 is an explanatory diagram showing an example of a timing chart of the image display device according to the present invention.

FIG. 9 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 10 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 11 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 12 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 13 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIGS. 14A and 14B are explanatory diagrams showing display examples of the image display device according to the present invention.

FIGS. 15A and 15B are explanatory diagrams showing other display examples of the image display device according to the present invention.

FIG. 16 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

17 (a) and (b) are explanatory views showing other display examples of the image display device according to the present invention.

FIG. 18 is an explanatory diagram illustrating a configuration example of a data signal line driving circuit included in the image display device according to the present invention.

FIG. 19 is an explanatory diagram illustrating another configuration example of the data signal line driving circuit included in the image display device according to the present invention.

FIG. 20 is an explanatory diagram showing another display example of the image display device according to the present invention.

FIG. 21 is an explanatory diagram showing another display example of the image display device according to the present invention.

FIG. 22 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 23 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 24 is an explanatory diagram illustrating another configuration example of the data signal line drive circuit included in the image display device according to the present invention.

FIG. 25 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 26 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 27 is a block diagram showing another configuration example of the image display device according to the present invention.

FIGS. 28 (a) and (b) are block diagrams showing another configuration example of the image display device according to the present invention.

FIGS. 29A and 29B are block diagrams showing another configuration example of the image display device according to the present invention.

FIGS. 30A and 30B are explanatory diagrams showing an operation example of a video signal processing circuit which is a part of the image display device according to the present invention.

FIGS. 31A and 31B are explanatory diagrams showing an operation example of a timing circuit which is a part of the image display device according to the present invention.

FIG. 32 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 33 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 34 is a block diagram illustrating another configuration example of the image display device according to the present invention.

FIG. 35 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 36 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 37 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 38 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 39 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 40 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 41 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 42 is an explanatory diagram illustrating another configuration example of the scanning signal line driving circuit included in the image display device according to the present invention.

FIGS. 43 (a) and (b) are explanatory diagrams showing examples of an image display device according to the present invention.

FIGS. 44 (a) and (b) are explanatory diagrams showing another example of the image display device according to the present invention.

FIGS. 45A and 45B are explanatory views showing other display examples of the image display device according to the present invention.

FIG. 46 is an explanatory diagram illustrating another configuration example of the data signal line drive circuit included in the image display device according to the present invention.

FIG. 47 is an explanatory diagram illustrating a configuration example of a scanning signal line driving circuit included in the image display device according to the present invention.

FIG. 48 is an explanatory diagram illustrating another configuration example of the data signal line driving circuit included in the image display device according to the present invention.

FIG. 49 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 50 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 51 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 52 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIGS. 53A and 53B are explanatory views showing other display examples of the image display device according to the present invention.

FIG. 54 is an explanatory diagram illustrating another configuration example of the data signal line driving circuit included in the image display device according to the present invention.

FIGS. 55A and 55B are explanatory views showing other display examples of the image display device according to the present invention.

FIGS. 56A and 56B are explanatory views showing other display examples of the image display device according to the present invention.

FIG. 57 is an explanatory diagram illustrating another configuration example of the data signal line driving circuit included in the image display device according to the present invention.

FIG. 58 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 59 is an explanatory diagram illustrating another configuration example of the data signal line drive circuit included in the image display device according to the present invention.

FIG. 60 is an explanatory diagram illustrating another configuration example of the data signal line driving circuit included in the image display device according to the present invention.

FIGS. 61 (a) and (b) are explanatory views showing another configuration example of the image display device according to the present invention.

FIGS. 62A and 62B are explanatory diagrams showing other display examples of the image display device according to the present invention.

FIGS. 63 (a) and (b) are explanatory views showing other display examples of the image display device according to the present invention.

FIGS. 64A and 64B are explanatory diagrams showing another example of the image display device according to the present invention.

FIG. 65 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 66 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 67 is an explanatory diagram showing another configuration example of the scanning signal line driving circuit included in the image display device according to the present invention.

FIG. 68 is an explanatory diagram showing a configuration example of a scanning circuit included in the scanning signal line driving circuit shown in FIG. 67;

FIG. 69 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 70 is an explanatory diagram illustrating another configuration example of the data signal line driving circuit included in the image display device according to the present invention.

FIG. 71 is an explanatory diagram showing a configuration example of a scanning circuit forming the data signal line driving circuit shown in FIG. 70;

FIG. 72 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 73 is an explanatory diagram illustrating another configuration example of the scanning signal line driving circuit included in the image display device according to the present invention.

FIG. 74 is an explanatory diagram showing another example of the timing chart of the image display device according to the present invention.

FIG. 75 is an explanatory diagram showing another configuration example of the data signal line drive circuit included in the image display device according to the present invention.

FIG. 76 is a block diagram showing another configuration example of the image display device according to the present invention.

FIG. 77 is a cross-sectional view illustrating an example of an active element included in the image display device according to the present invention.

FIGS. 78A to 78K are cross-sectional views illustrating an example of a manufacturing process of an active element included in the image display device according to the present invention.

FIG. 79 is an explanatory diagram illustrating a configuration example of an electronic device according to the invention.

FIGS. 80A and 80B are explanatory diagrams illustrating another configuration example of the electronic apparatus according to the invention.

FIGS. 81 (a) and (b) are explanatory diagrams showing another configuration example of the electronic device according to the present invention.

FIG. 82 is an explanatory diagram illustrating another configuration example of the electronic device according to the present invention.

FIG. 83 is an explanatory diagram showing another configuration example of the electronic device according to the present invention.

FIG. 84 is an explanatory diagram showing another configuration example of the electronic device according to the present invention.

FIG. 85 is an explanatory diagram showing another configuration example of the electronic device according to the present invention.

FIGS. 86 (a) and (b) are explanatory diagrams showing another configuration example of the electronic apparatus according to the present invention.

FIG. 87 is an explanatory diagram showing another configuration example of the electronic device according to the present invention.

FIG. 88 is an explanatory diagram illustrating another configuration example of the electronic apparatus according to the invention.

FIG. 89 is an explanatory diagram illustrating another configuration example of the electronic apparatus according to the invention.

FIG. 90 is an explanatory diagram illustrating another configuration example of the electronic apparatus according to the invention.

FIG. 91 is an explanatory diagram illustrating another configuration example of the electronic device according to the invention.

FIG. 92 is an explanatory diagram illustrating another configuration example of the electronic apparatus according to the invention.

FIG. 93 is a block diagram illustrating a configuration example of a conventional image display device.

94 is an explanatory diagram showing an example of an internal structure of a pixel in the image display device shown in FIG. 93.

FIG. 95 is a circuit diagram illustrating an example of a data signal line driving circuit included in a conventional image display device.

FIG. 96 is an explanatory diagram showing another configuration example of the data signal line driving circuit included in the conventional image display device.

FIG. 97 is an explanatory diagram illustrating a configuration example of a data signal line driver circuit included in the image display device.

FIG. 98 is an explanatory diagram illustrating a configuration example of a data signal line driving circuit included in the image display device.

FIG. 99 is an explanatory diagram illustrating a configuration example of a data signal line driving circuit included in the image display device.

FIG. 100 is a circuit diagram illustrating an example of a scanning signal line driving circuit included in a conventional image display device.

FIG. 101 is an explanatory diagram illustrating an example of a timing chart of a conventional image display device.

FIG. 102 is a block diagram showing another configuration example of a conventional image display device.

[Explanation of symbols]

REFERENCE SIGNS LIST 100 glass substrate 102 polycrystalline silicon thin film 102 a channel region 102 b source region 102 c drain region 103 gate insulating film 104 gate electrode 105 interlayer insulating film 105 a contact hole 106 metal wiring 108 resist 111 n-type region 112 central region 113 p-type region 114 central region 201 optical sensor 202 main body 203 display section 204 operation section 205 audio output section 206 built-in battery 211 main body 212 display section 213 operation section 214 audio output section 215 audio input section 216 antenna 217 built-in battery 221 main body 222 display section 223 operation section 224 audio output Unit 225 Storage medium insertion unit 226 Built-in battery 231 Main body 232 Imaging unit 234 Display unit 235 Operation unit 236 Storage medium insertion unit 237 Built-in battery Lee 241 main body 242 imaging unit 243 audio input unit 244 display unit 245 operation unit 246 storage medium insertion unit 251 main unit 252 imaging unit 253 display unit 254 operation unit 255 storage medium insertion unit 256 built-in battery 261 main unit 262 display unit 263 operation unit 264 storage Medium insertion unit 265 Built-in battery 271a Main unit 271b Main unit 272 Display unit 273 Audio output unit 274 Operation unit 275 Storage medium insertion unit 281 Main unit 282 Display unit 283 Audio output unit 284 Operation unit 285 Antenna 286 Input / output terminal 287 Internal battery 291 Main unit 292 Display Unit 293 Audio output unit 294 Operation unit 295 Storage medium insertion unit 296 Input / output terminal 297 Built-in battery 301 Main unit 302 Display unit 303 Audio output unit 304 Operation unit 305 Input / output terminal 306 Storage medium insertion unit 307 Built-in battery AMP Analog amplifier (amplifier circuit) ARY Pixel array AS Analog switch (selection switch) CLK Clock signal COM Common terminal CTL Timing circuit (display mode switching means) DA Digital-analog conversion circuit DAC Intermediate potential generation circuit DB, DW Reference signal for binary video signal DAT, DAT1, DAT2 Video signal DIG Digital video signal DIN Input video signal DLV Video level FF flip-flop FMT Display format control signal GCK Clock signal GCS1, GCS2 Selection signal GD, GD1, GD2 Scan Signal line drive circuit GDB1, GDB2 Scan signal output circuit GEN, GEN1, GEN2 Enable signal GFD Control signal for driving all stages GL Scan signal line GPD Control for partial drive Signal GRS reset signal GST, GST1, GST2 start signal GSR shift register circuit IMD superimposed video signal IMP superimposed control signal JDG discriminating circuit (picture type discriminating means) LT, LAT latch circuit MUX multiplexer PIX pixel SCK clock signal SCS1, SCS2 selection signal SD, SD1, SD2 Data signal line drive circuit SDB1, SDB2 Data signal output circuit SDSW Switch (drive circuit separation means) SEL Control signal SEN Detection circuit (detection means) SFD Full-stage drive control signal SL Data signal line SLT Changeover switch (timing signal supply destination switching means) SLD Changeover switch (video signal supply destination switching means) SPD Partial drive control signal SRS Reset signal SST, SST , SST2 start signal SSR shift register circuit ST selection circuit (selection switch) SUB substrate SWT selection switch TFG transfer gate TG control switch TIN input timing signal VGEN power supply circuit VGENSW switch VID video signal processing circuit (display mode switching means) VREF video signal Reference potential VSEL Reference voltage selection circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/20 660 G09G 3/20 660N 680 680G G02F 1/133 550 G02F 1/133 550 G09F 9/00 346 G09F 9/00 346A 9/30 338 9/30 338 9/40 301 9/40 301 G09G 3/36 G09G 3/36 (72) Inventor Michael James Brownlaw United Kingdom OEX4 4 Wibby Oxford, Sandford O Thames, Church Road 124 (72) Inventor Graham Andrew Kerns O.X.28 N.Oxford, Catslow, Bonn Close 22F Term (Reference) 2H093 NA32 NC09 NC11 NC 16 NC22 NC24 NC26 NC34 ND01 ND06 ND34 ND39 ND40 ND49 ND52 ND54 NE01 5C006 AA01 AA02 AA16 AF44 AF68 AF69 AF71 AF83 BB11 BB28 BC03 BC12 BC20 BF02 BF03 BF04 BF06 BF15 BF24 BF26 BF27 EB27 BF27 BF27 BF27 BF27 BF27 BF27 JJ02 JJ03 JJ04 JJ06 KK07 5C094 AA02 AA22 BA03 BA05 BA43 CA19 CA24 DA09 EA04 EA07 EB02 HA05 HA06 HA08 5G435 AA00 BB12 CC13 DD01 EE33 EE37 LL04 LL07 LL08 LL14 LL17

Claims (58)

[Claims] 1. A pixel array comprising a plurality of pixels for displaying an image, a data signal line driving circuit for supplying a video signal to the pixel array, and a scanning signal line driving circuit for controlling writing of a video signal to the pixel. An image display device comprising: a data signal line driving circuit; a timing circuit for supplying a timing signal to the scanning signal line driving circuit; and a video signal processing circuit for supplying a video signal to the data signal line driving circuit. For at least one of the data signal line driving circuit and the scanning signal line driving circuit, at least a part of the driving circuit is provided, and the driving circuits are
An image display device having different display modes. 2. The image display according to claim 1, wherein, of the drive circuit having at least a part of the plurality of drive circuits, only one of the drive circuits operates at each time. apparatus. 3. The image display device according to claim 1, wherein at least a part of said plurality of driving circuits is driven at least during the same frame period. 4. The image display device according to claim 1, wherein the drive circuit to be driven is switched within the same frame period for at least a part of the drive circuit. 5. The driving circuit according to claim 1, wherein at least two of the driving circuits write image data to different areas in a screen. An image display device according to claim 1. 6. A data signal line driving circuit comprising a plurality of at least a plurality of data signal line driving circuits, wherein at least two of the data signal line driving circuits form an image on at least a part of a screen in the same region within the same frame period. 3. The image display device according to claim 1, wherein data is written. 7. The data signal line driving circuit according to claim 6, wherein at least two of said plurality of data signal line driving circuits operate simultaneously.
An image display device according to claim 1. 8. At least one of the plurality of data signal line driving circuits writes image data by overwriting an image written by another data signal line driving circuit within the same frame period. The image display device according to claim 6. 9. The image display device according to claim 8, wherein at least one of said plurality of data signal line driving circuits overwrites an image in units of a horizontal scanning period. 10. The image display device according to claim 8, wherein at least one of said plurality of data signal line driving circuits overwrites an image only in a part of each horizontal scanning period. . 11. A data signal line driving circuit comprising: a plurality of data signal line driving circuits; at least one of the plurality of data signal line driving circuits comprises:
11. The image display device according to claim 1, wherein image data is written within a blanking period of each horizontal scanning period. 12. A data signal line driving circuit comprising a plurality of data signal line driving circuits, wherein at least one of the plurality of data signal line driving circuits comprises:
11. The image display device according to claim 1, wherein the image data is written after a certain period of time behind other data signal line driving circuits. 13. The driving circuit according to claim 1, wherein at least a part of the driving circuit is provided on a plurality of sides, and the driving circuits are arranged on opposite sides of the pixel array. The image display device as described in the above. 14. The driving circuit according to claim 1, wherein at least a part of the driving circuit is provided on the same side with respect to a pixel array. Image display device. 15. The image display device according to claim 1, wherein at least a part of the driving circuit includes a plurality of driving circuits, each of which has a common circuit. . 16. A driving circuit comprising at least a part of a plurality of driving circuits, wherein the driving circuit controls which of the driving circuits is driven by an externally input signal. An image display device according to any one of the above. 17. According to the type of display data to be inputted,
17. The image display device according to claim 1, wherein one of the different display modes is selected. 18. The image display device according to claim 1, wherein one of the different display modes is selected according to a use environment. 19. The video signal processing circuit according to claim 1, wherein the video signal processing circuit converts the input video signal into a plurality of display formats of different display formats. The image display device as described in the above. 20. The timing circuit according to claim 1, wherein the timing circuit converts the input timing signal into a signal corresponding to the display format as the different display form. Image display device. 21. A timing circuit according to claim 1, wherein said timing circuit includes timing signal supply destination switching means for switching a timing signal supply destination in response to an external control signal. Image display device. 22. The video signal processing circuit according to claim 1, further comprising a video signal supply destination switching means for switching a supply destination of the video signal in response to an external control signal. An image display device according to claim 1. 23. The apparatus according to claim 1, further comprising: detecting means for detecting a use environment; and display form switching means for switching the display form based on a signal from the detecting means. The image display device as described in the above. 24. An image processing apparatus comprising: a video type determination unit configured to determine a type of an input video signal; and a display mode switching unit configured to switch the display mode based on a signal from the video type determination unit. The image display device according to claim 1. 25. The image according to claim 1, wherein the drive circuit includes a plurality of drive circuits, each of which includes an independent power supply terminal and an independent input terminal. Display device. 26. The driving circuit according to claim 1, wherein at least a part of the driving circuit includes a plurality of power supply terminals and a part of input terminals. An image display device according to claim 1. 27. The driving circuit, wherein at least a part of the driving circuit is provided with a plurality of driving circuits, the supply of power to the non-operating driving circuit among the driving circuits is stopped. 17. The image display device according to any one of 16). 28. The driving circuit, wherein at least a part of the driving circuit is provided with a plurality of driving circuits, wherein the driving circuit that is not used for display is electrically separated from the pixel array. The image display device according to claim 1. 29. The image display device according to claim 1, wherein one of the plurality of display formats as different display forms has higher image quality than the other. 30. The image display device according to claim 1, wherein one of the plurality of display formats as different display modes has lower power consumption than the other. 31. The image display device according to claim 29, wherein one of the plurality of display formats has a higher display resolution than the other. 32. The image display device according to claim 29, wherein one of the plurality of display formats is a color display and the other is a black and white display. 33. A data signal line driving circuit comprising: a plurality of data signal line driving circuits, wherein at least one of the plurality of data signal line driving circuits writes the same image data to a plurality of data signal lines. The image display device according to claim 31. 34. A data signal line drive circuit comprising at least a plurality of data signal line drive circuits, wherein at least one of the plurality of data signal line drive circuits has a plurality of data signal lines corresponding to a plurality of pixels of the same color which are continuous in the horizontal direction. 33. The image display device according to claim 31, wherein the same image data is written in the image display device. 35. A data signal line corresponding to a plurality of pixels of three colors continuous in a horizontal direction in at least one of the plurality of data signal line drive circuits, wherein at least one of the plurality of data signal line drive circuits is provided. 33. The image display device according to claim 32, wherein the same image data is written in the image display device. 36. In a display format having a lower display resolution, scanning signals are written to a plurality of continuous scanning signal lines at different timings, and in each scanning period, the same image signal is sent from the data signal line driving circuit. The image display device according to claim 31, wherein data is output. 37. In a display format having a lower display resolution, a scanning signal is written to a plurality of continuous scanning signal lines at different timings, and during a period including a plurality of scanning periods, the data signal line driving circuit transmits the scanning signal. The output image data is
32. The image display device according to claim 31, wherein the data is held in each data signal line. 38. In a display format having a lower display resolution, scanning signals are written to a plurality of continuous scanning signal lines at different timings, and during each scanning period, the data signal line driving circuit outputs a polarity signal from the data signal line driving circuit. The image display device according to claim 31, wherein image data corresponding to different same gradations is output. 39. The image display apparatus according to claim 31, wherein in the display format having a lower display resolution, the image data written to each of the data signal lines has the same polarity during one frame period. . 40. The image display device according to claim 29, wherein one of the plurality of display formats has a larger number of display gradations than the other. 41. The image display device according to claim 29, wherein one of the plurality of display formats corresponds to a halftone display and the other is a binary display. 42. A data signal line drive circuit comprising at least a part of a plurality of data signal line drive circuits, wherein said data signal line drive circuit includes a reference voltage selection circuit and an intermediate potential generation circuit. Operating only the reference voltage selection circuit and not operating the intermediate potential generation circuit. On the other hand, when there are many display gradations, the reference voltage selection circuit and the intermediate potential generation circuit are operated together. The image display device according to claim 40 or 41. 43. A data signal line drive circuit comprising a plurality of at least a part thereof, wherein said data signal line drive circuit comprises an amplifier circuit, wherein said amplifier circuit does not operate when display gradation is small, 43. The image display device according to claim 40, wherein the amplifier circuit is operated when the number of gradations is large. 44. In the plurality of display formats,
31. The image display device according to claim 29, wherein one of the input video signals is an analog signal and the other is a digital signal. 45. In the plurality of display formats,
31. The image display device according to claim 29, wherein one of the input video signals is image data and the other is text data. 46. In the plurality of display formats,
31. The image display device according to claim 29, wherein one of the input video signals is natural image data and the other is graphic data. 47. The image according to claim 29, wherein one of the plurality of display modes as different display modes is a transmissive display mode and the other is a reflective display mode. Display device. 48. The driving circuit according to claim 1, wherein image data is not written in at least a part of a display area in any of the driving circuits provided with a plurality of at least a part thereof. The image display device as described in the above. 49. In the driving circuit, by controlling the output of the driving circuit using a signal corresponding to the driving timing of each signal line, image data is not written in a partial area. Item 49. The image display device according to item 48. 50. In the driving circuit, the output of the driving circuit is controlled by using a reset signal for stopping the scanning of the driving circuit, so that image data is not written in a partial area. 48. The image display device according to 48. 51. In the above driving circuit, a start signal for starting scanning of the driving circuit is inputted from an intermediate stage of the scanning circuit in the driving circuit, so that image data is not written in a partial area. 49. The image display device according to claim 48, wherein: 52. The driving circuit according to claim 1, wherein at least a part of said driving circuit is provided on the same substrate as said pixels. Image display device. 53. The image display device according to claim 52, wherein in the drive circuit having at least a part of the plurality of drive circuits, an active element constituting the drive circuit is a polycrystalline silicon thin film transistor. 54. The driving circuit, wherein at least a part of the driving circuit is provided, wherein the active elements constituting the driving circuit are formed on a glass substrate by a process at a temperature of 600 ° C. or less. 53. The image display device according to 53. 55. An electronic apparatus provided with an image display device as an output device, wherein the image display device is the image display device according to claim 1. 56. The electronic apparatus according to claim 55, wherein a display mode or a display format is switched between a period when driven by an external power supply and a period when driven by a built-in battery. 57. The electronic apparatus according to claim 55, wherein a display mode or a display format is switched between a standby mode and an operation mode. 58. The electronic apparatus according to claim 55, wherein a display mode or a display format is switched according to the surrounding brightness at the time of use.