JP5247353B2 - Driving method and electro-optical device - Google Patents

Description

  The present invention relates to a driving technique for a so-called color sequential electro-optical device.

In general, in the color sequential method, a frame period for forming one color image is divided into subframe periods corresponding to, for example, three primary colors of red (R), green (G), and blue (B), and each sub In the frame period, information (for example, voltage) corresponding to the gradation (brightness) of the primary color component in the subframe period is written in the pixel of the display panel, and then the display panel is irradiated with light of the primary color. Yes. As a result, the primary color images of R, G, and B are sequentially displayed, so that these primary color images are overlapped and viewed as a full color image by humans (see Patent Document 1).
In such a color sequential method, it is not necessary to provide a color filter in the display element, and it is not necessary to divide one pixel into R, G, and B sub-pixels, which facilitates high definition.
JP-A-11-237606

By the way, in such a color sequential system, after writing a voltage corresponding to the brightness of the primary color component in all pixels of the display panel in each subframe period, the display panel starts irradiating light of the primary color on the screen. There is a possibility that you will not be able to get enough brightness.
In particular, when a long time is required for writing to the pixels of the display panel, it is not possible to secure a period of light irradiation. Note that if a high-luminance type is used as the light source for irradiating light, the screen can be brightened even if the irradiation period is short, but not only the apparatus scale is increased, but also the cost is increased.
The present invention has been made in view of the above-described circumstances, and one of its purposes is to provide a technique for sufficiently securing the brightness of the screen by increasing the light irradiation period in the color sequential method. There is.

In order to solve the above-described problem, the electro-optical device driving method according to the present invention includes a plurality of pixels each having a transmittance or a reflectance according to written information, and the plurality of pixels. Irradiating means for irradiating light of any one of at least three primary colors different from each other, and dividing the unit period into subframe periods corresponding to the primary colors, and in each subframe period, wherein the plurality of pixels, write the information of the primary color component corresponding to the sub-frame period, the operation of writing the same information simultaneously select two or more adjacent pixels, over a specific area previously determined by repeating the image of the primary color components formed of different resolutions depending on the position, after the write in one sub-frame period, in the next sub-frame period Before looking Inclusive, and then irradiating the light of the primary colors in which the illumination means corresponding to the sub-frame period of the one to the plurality of pixels. According to the present invention, the pixel scanning period is shortened by writing a low-resolution image, so that a long light emission period can be secured.

In the present invention, the upper and lower resolutions of the image may be lower than the resolution of the central portion.
Since the viewpoint is difficult to face in the upper and lower areas, the reduction in resolution can be made inconspicuous. In the present invention, the resolution of the peripheral part of the image may be lower than the resolution of the central part. Similarly, since it is difficult for the viewpoint to turn to the peripheral area, a decrease in resolution can be made inconspicuous .
In the present gun invention, each of the plurality of pixels, as well as sequences corresponding to intersections of the plurality of rows of scanning lines and data lines of the plurality of rows, when the scanning line is selected, supplied to the data line The voltage of the data signal thus written is written, and an odd-numbered scanning line and an even-numbered scanning line adjacent to the odd-numbered scanning line are selected as a set in order in a predetermined direction, and are simultaneously selected. The voltage based on one of the information of two pixels corresponding to the intersection of the scanning line of the two rows and the one data line when the odd-numbered and even-numbered scanning lines of the set are simultaneously selected These data signals may be supplied to the one data line.
In the present invention, the resolution of the specific area may be switched depending on whether the image to be displayed is a moving image or a still image. When switching is possible, it is desirable to lower the resolution of the specific area when the image to be displayed is a moving image than when it is a still image. This is based on the fact that when a moving image is displayed, it is difficult to visually recognize a decrease in resolution.
Note that the switching of the resolution may be in accordance with designation by a designation unit or in accordance with the result of image analysis. Further, the present invention can be conceptualized not only as a driving method but also as an electro-optical device.

  Hereinafter, modes for carrying out the present invention will be described.

<First Embodiment>
First, the driving method of the electro-optical device according to the first embodiment of the invention will be described. FIG. 1 is a diagram showing an optical configuration of a projector as an example of an electro-optical device to which this driving method is applied.
In this figure, an LED 11R is a light emitting diode that is positioned in the 12 o'clock direction as viewed from the center of the dichroic prism 13 and emits R (red) light downward in the figure. The R light emitted by the LED 11R becomes a substantially parallel light beam by the collimator lens 12R. Similarly, the LEDs 11G and 11B are light emitting diodes that are positioned in the 9 o'clock and 6 o'clock directions, respectively, and emit G (green) and B (blue) light toward the right and upward in the drawing. The G and B lights emitted by the LEDs 11G and 11B are also converted into substantially parallel light beams by the collimator lenses 12G and 12B, respectively.
Since the LEDs 11R, 11G, and 11B are controlled to emit light by a control circuit described later, these three LEDs serve as irradiation means.

  The dichroic prism 13 has dichroic surfaces 13R and 13B orthogonal to each other. Of these, the dichroic surface 13R reflects R light incident from the 12 o'clock direction, emits it in the 3 o'clock direction, and transmits light of other colors. The dichroic surface 13B reflects the B light incident from the 6 o'clock direction, emits it in the 3 o'clock direction, and transmits light of other colors. On the other hand, the G light incident from the 9 o'clock direction passes through the dichroic surfaces 13R and 13B and is emitted as it is in the 3 o'clock direction.

A display panel 100 is disposed on the exit surface of the dichroic prism 13. The display panel 100 is, for example, an active matrix transmissive liquid crystal display panel, and has a plurality of pixels. The projection lens group 14 is an optical system that enlarges and projects a transmission image whose transmittance is defined for each pixel by the display panel 100 toward the screen 200.
As will be described later, the frame period is divided into R, G, and B subframe periods, and in each subframe period, each pixel has a transmittance corresponding to the brightness of the primary color components of R, G, and B. Then, the operation of causing the LED of the primary color to emit light is repeated in R, G, and B. For this reason, R, G, and B primary color images are sequentially displayed, and these primary color images are overlapped and visually viewed as a full color image.

Next, the electrical configuration of the projector 10 will be described with reference to FIG.
As shown in this figure, the projector 10 includes a control circuit 20, an image processing circuit 30, a data signal conversion circuit 40, and a display panel 100. Among these, the control circuit 20 controls each unit based on a synchronization signal Sync supplied from a host device (not shown).
The image processing circuit 30 temporarily stores the digital video signal Vid supplied from the host device in the internal memory, and then reads out the primary color component of the pixel according to the control by the control circuit 20 and outputs it as the video signal Vd. Here, the video signal Vid supplied from the host device is digital data that specifies the brightness (gradation) of each of the R, G, and B color components for each pixel of the display panel 100, and is added to the synchronization signal Sync. They are supplied for each pixel in the order of scanning according to the included vertical scanning signal, horizontal scanning signal, and dot clock signal (all not shown).

  The data signal conversion circuit 40 converts the video signal Vd supplied from the image processing circuit 30 into an analog data signal Vs suitable for driving the display panel 100, and matches the drive timing of the Y driver 130 and the X driver 140. To the display panel 100.

In the display region 100a of the display panel 100, for example, 768 rows of scanning lines 112 extend in the horizontal direction in the figure, and 1024 columns of data lines 114 extend in the vertical direction in the figure, and each scanning line 112 The pixels 110 are disposed so as to be electrically insulated from each other and corresponding to the intersections of the scanning lines 112 and the data lines 114, respectively. Therefore, in the present embodiment, the pixels 110 are arranged in a matrix of 768 rows × 1024 columns in the display region 100a.
In order to distinguish the scanning lines 112 for convenience, in the following description, there are cases in which the first, second, third,. Similarly, in order to distinguish the data lines 114, they may be referred to as 1, 2, 3,.

The Y driver 130 is a scanning line driving circuit that supplies a scanning signal to each scanning line under the control of the control circuit 20, and selects a selected voltage for the selected scanning line and a non-selected voltage for the other scanning lines. , Respectively. Note that the scanning signals supplied to the scanning lines 112 in the first, second, third,..., And 768th rows are denoted as G1, G2, G3,.
The X driver 140 samples the data signal Vs converted by the data signal conversion circuit 40 for each of the pixels 110 corresponding to the selected row to the data line 114 according to a sampling signal described later. Circuit. Although the detailed configuration of the X driver 140 is omitted, the control circuit 20 includes a switch having one end connected to each data line 114 and the other end connected to the supply line of the data signal Vs. Sampling signals to be described later are output according to the control, and the on / off of the switch is controlled according to these sampling signals.
The data signals sampled on the data lines 114 in the 1, 2, 3,..., 1024th column are denoted as d1, d2, d3,.

The pixel 110 will be described with reference to FIG.
As shown in this figure, in the pixel 110, the source electrode of the n-channel TFT 116 is connected to the data line 114, the drain electrode is connected to the pixel electrode 118, and the gate electrode is connected to the scanning line 112. It is connected.
The pixel electrode 118 is provided for each pixel, whereas the counter electrode 108 is provided in common to all the pixels so as to face all of the pixel electrodes 118, and a constant voltage LCcom is applied thereto. . Then, the liquid crystal 105 is sandwiched between the counter electrode 108 and the pixel electrode 118, thereby forming the liquid crystal element 120. Therefore, the liquid crystal element 120 including the pixel electrode 118, the counter electrode 108, and the liquid crystal 105 is provided for each pixel.

The liquid crystal element 120 having such a configuration holds a voltage between the pixel electrode 118 and the counter electrode 108, and has a transmittance corresponding to the effective value of the held voltage if it is a transmission type. This is because in the liquid crystal element 120, the molecular orientation state of the liquid crystal 105 interposed between the two electrodes changes due to fear of voltage between the pixel electrode 118 and the counter electrode 108.
When a selection voltage is applied to the scanning line 112 and a data signal having a voltage corresponding to the designated gradation value is supplied to the pixel corresponding to the selected scanning line 112 to the data line 114, the pixel in the selection scanning line is supplied. 110 TFT 116 is turned on, and the data signal is applied to the pixel electrode 118 via the TFT 116 in the on state. Therefore, a voltage corresponding to the gradation value is applied to and held in the liquid crystal element 120, The transmittance according to the gradation can be made.
Note that even when a non-selection voltage is applied to the scan line to turn off the TFT 116, the voltage written in the liquid crystal element 120 when the TFT 116 is on is held by its capacitance.

In the present embodiment, for convenience, if the effective voltage value held in the liquid crystal element 120 is close to zero, the light transmittance is maximized to display white, while the amount of transmitted light increases as the effective voltage value increases. It is assumed that the normally white mode decreases.
In order to prevent the direct current component from being applied to the liquid crystal 105, the data signal conversion circuit 40 converts the video signal Vd specifying the brightness of the pixel into the data signal Vs to be applied to the pixel electrode 118. The reference voltage Vc (substantially the same voltage as the voltage LCcom of the counter electrode 108 or a lower voltage) is set to a predetermined period (for example, a subframe period, which will be described later), between a higher positive voltage and a lower negative voltage. Alternatively, conversion is performed by alternately switching every frame period). This polarity is specified by the control circuit 20.

Next, color sequential driving according to the present embodiment will be described. FIG. 4 is a diagram showing an outline of color sequential driving according to the present embodiment.
In this figure, the frame period refers to a period required to display one frame of a color image by driving the display panel 100 or the LEDs 11R, 11G, and 11B. If the vertical scanning frequency is 60 Hz, The reciprocal is 16.7 milliseconds. The vertical scanning period and the frame period defined by the synchronization signal Sync are the same in terms of the period length, but the video signal Vid supplied in synchronization with the synchronization signal Vsync is temporarily stored in the image processing circuit 30. Since the display panel 100 and the like are driven in accordance with the readout, the frame period indicating the driving of the display panel and the like is delayed from the vertical scanning period defined by the synchronization signal Sync. There is a relationship.

As shown in FIG. 4, the frame period is equally divided into three subframe periods of R, G, and B. Each of the R, G, and B subframe periods includes a scanning period and a light emitting period. Among these, the scanning period is a period in which a scanning line is selected and a data signal is written to the pixel corresponding to the selected scanning line, and the light emission period is caused to emit an LED having a color corresponding to the subframe period. It is a period.
An electro-optical element such as the liquid crystal element 120 does not immediately have a transmittance corresponding to the voltage even if a voltage corresponding to the transmittance is written. That is, the voltage is not changed to the voltage after the voltage is written. Since there is a time lag until the corresponding transmittance is reached, the light emission period is started after a waiting period after the scanning period ends. Thereby, it is prevented that an unintended image is visually recognized by irradiating light before the transmittance corresponding to the written voltage is obtained. This light emission period ends before the scanning period of the next subframe period starts.

Note that the R emission period in which the LED 11R emits light in the R subframe period, the G emission period in which the LED 11G emits light in the G subframe period, and the B emission period in which the LED 11B emits light in the B subframe period have the same length. Is set to This is in order to make the irradiation intensity of each primary color uniform, in other words, to prevent the white balance from being lost.
Also, an R standby period from the R scanning period to the R light emission period for writing the R component in the R subframe period, a G standby period from the G scanning period to the G light emission period for writing the G component in the G subframe period, Also, the B standby period from the B scanning period to the B light emission period for writing the B component in the B subframe period is set to have the same period length.

Next, the operation in the scanning period in each subframe period will be described in the R subframe period.
First, the control circuit 20 controls the R scanning period as follows. Specifically, for the Y driver 130, the control circuit 20 simultaneously selects the selection voltage for two lines, the odd numbered row and the even numbered row that is one row lower than the odd numbered row, for the first to 192th scanning lines 112. The operation of applying the selection voltage is controlled to be executed in order from the top, and the scanning line 112 in the 193rd to 578th rows is controlled to execute the operation of applying the selection voltage one row at a time in order from the top. The scanning lines 112 in the ˜768th row are controlled so that the operation of applying the selection voltage simultaneously to the odd rows and the even rows one row below the odd rows is sequentially applied from the top. To do. The time for applying the selection voltage is the same in the first embodiment.

  By this control, the scanning signals G1, G2, G3,..., G768 are output by the Y driver 130 as shown in FIG. As shown in this figure, in the period (a), the scanning lines in the first, second, third, fourth,..., 191 and 192 rows are simultaneously selected, that is, a selection voltage is applied, and the period ( In b), the scanning lines of 193, 194,... 575, 576 are selected one by one. Two lines are selected simultaneously.

On the other hand, the control circuit 20 stores the image processing circuit 30 in the internal memory when an odd-numbered row and an even-numbered row one row lower than the odd-numbered row are simultaneously selected in the period (a). Of the video signal, the gray level of the R component designated for the pixel located in one of the two selected rows, for example, the odd-numbered row, is read in the order of 1, 2, 3,..., 1024 columns. To control.
Next, when one row of scanning lines is selected for the image processing circuit 30 in the period (b), the control circuit 20 selects a pixel located on the selected scanning line from among the video signals stored in the internal memory. Are controlled so as to read out the gradation of the R component designated in the order of 1, 2, 3,..., 1024 columns.
Then, when the odd number row and the even number row one row below this odd number are simultaneously selected in the period (c), the control circuit 20 simultaneously selects the odd number row and the odd number in the period (c). In addition, control is performed such that, for example, the gradation of the R component designated for the pixel located in the odd-numbered row of the video signal stored in the internal memory is read out in the order of 1, 2, 3,..., 1024 columns. .

  The control circuit 20 designates the conversion polarity for the data signal conversion circuit 40 through the period (a), the period (b), and the period (c) of the R scanning period. Further, the control circuit 20 controls the X driver 140 to sequentially sample the data signal Vs on the data lines 114 in the 1, 2, 3,. In this sampling control, as shown in FIG. 6, the sampling signals s1, s2, s3,... In this control, the video signals Vd in the 2nd, 3rd,..., 1024th columns are output as the video signals Vd are read from the image processing circuit 30.

With this control, in the period (a) of the R scanning period, in the first to 192th rows of the display panel 100, when viewed in the same column, two pixels of an odd row and an even row adjacent to the odd row below. The data signals corresponding to the pixels in the odd rows are written at the same time. Therefore, the voltage corresponding to the gradation of the R component is written in the pixels 110 in the first to 192th rows in a state where the vertical resolution is reduced to half. In the subsequent period (b), data signals are written row by row in the 193rd to 576th rows of the display panel 100, so that the R component of the R component is returned to the pixels 110 in the 193rd to 576th rows with the vertical resolution restored. A voltage corresponding to the gradation is written. In the period (c) of the R scanning period, when viewed in the same column in the 577th to 768th lines of the display panel 100, as in the period (a), the odd-numbered row and the even-numbered row adjacent to the odd-numbered row are Since the data signals corresponding to the pixels in the odd-numbered rows are simultaneously written to the two pixels, the pixels 110 in the 777th to 768th pixels correspond to the gradation of the R component with the vertical resolution reduced to half. The voltage is written.
In the G / B subframe period, the operation is the same as that in the R subframe period.
Therefore, the R component image is displayed in the R subframe period, the R component image is displayed in the G subframe period, and the R component image is displayed in the B subframe period. The primary color images overlap and are viewed as a full color image.

After all, in the display area 100a of the display panel 100, as shown in FIG. 7, the vertical resolution of the images displayed in the first to 192th rows on the upper end side and the 577 to 768th rows on the lower end side is the center. Compared to the image displayed in the 193rd to 576th lines, the image becomes half.
Note that although the vertical resolution of the images displayed on the upper end side and the lower end side is halved, there are few viewing problems because the viewpoint is difficult to face.

In the conventional driving method, since 1 to 768 scanning lines are selected one by one, the scanning period becomes longer. As shown in FIG. 14, in the R, G, B subframe period, R, G, B The light emission period cannot be extended and the screen cannot be brightened sufficiently.
On the other hand, in this embodiment, since the scanning lines 112 are selected every two rows for the 1st to 192th rows and the 577 to 768th rows, the scanning period is shortened accordingly. For this reason, as shown in FIG. 4, since the R, G, and B light emission periods can be secured long in the R, G, and B subframe periods, the screen can be sufficiently brightened. .
In FIG. 4, a polygonal line that descends to the right in the scanning period of each of R, G, and B indicates that the selected row of the scanning line is progressing from top to bottom over time. In the period (a) and the period (c), since the selection of the scanning line proceeds faster than in the period (b), the inclination is also large. Note that the scanning line selection period is actually a short straight line, but is sufficiently shorter than the time axis of FIG. 4 and is therefore a continuous diagonal straight line.

In the first embodiment, when the scanning lines of the 1st to 192th rows and the 577th to 768th scanning lines are simultaneously selected, the gradation of the color component corresponding to the pixels of the odd rows is read out. Pixels may be read out. In addition, odd-numbered rows and even-numbered rows may be alternately switched and read out for each frame period.
In the first embodiment, the scanning lines in the 1st to 192th rows and the 577th to 768th rows are selected at the same time, but three or more scanning lines may be simultaneously selected. Furthermore, the resolution in the vertical direction may be reduced stepwise as it goes toward the upper end side or the lower end side.
In addition, the region for reducing the vertical resolution may be a region other than the upper end or the lower end.

Second Embodiment
Next, color sequential driving according to the second embodiment of the present invention will be described. FIG. 8 is a waveform showing a scanning signal in a vertical scanning period of color sequential driving according to the second embodiment.
As shown in this figure, the color sequential driving according to the second embodiment is common to the period (a) and the period (c) in the R, G, B scanning period, but in the period (b), 193 The period during which the scanning lines in the ˜576th rows are selected is shorter than that in the first embodiment.
In the second embodiment, the reason why the period (b) in the R, G, B scanning period is shortened is that the control circuit 20 sends the scanning signal Gj (j is any of 193 to 576) to the X driver 140. This is because control is performed so that the sampling signals s1, s2, s3,..., S1024 are output as shown in FIG.
As shown in FIG. 9, in the period (d), the sampling control signals corresponding to the data lines in the first, second, third, fourth,. In e), the sampling control signals corresponding to the data lines in the 257th, 258th,..., 767, and 768th columns become H level one by one, and in the period (f), 769.770, 771.772,. The sampling control signal corresponding to the 1024th column data line is simultaneously set to the H level by two columns.

  In addition, the control circuit 20 controls the video signal stored in the internal memory during the period (d) of the period during which any one of the scanning lines on the 193rd to 576th rows is selected for the image processing circuit 30. Among the pixels located on the selected scanning line, for example, control is performed so as to read out gradations of color components corresponding to pixels in odd-numbered columns 1, 3, 5,. Is controlled so as to read out gradations of color components corresponding to pixels 257, 258,..., 767, and 768 that are pixels located on the selected scanning line from the video signal stored in the internal memory, and the period (f ), For example, out of the pixels located on the selected scanning line, control is performed so as to read out the gradations of the color components corresponding to the pixels in the odd-numbered columns 769, 771,.

By this control, in the period (d), the data signals of the color components corresponding to the pixels in the first, third,..., 255th columns are applied to the data lines in the first, second, third, fourth,. Of the 1st to 1024th columns located on the selected scanning line, the data signals corresponding to the pixels in the odd numbered columns are displayed in the two pixels adjacent to each other in the horizontal direction in the 1st to 256th columns. Is written.
In the period (e), data signals of color components corresponding to the pixels in the corresponding columns are sampled and written in the data lines of the 257, 258,..., 767, and 768 columns.
In the period (f), the data signals of the color components corresponding to the pixels in the 769, 771,..., 1023 columns are sampled on the data lines in the 769, 770, 771, 772,. Therefore, out of the 1st to 1024th columns positioned on the selected scanning line, the pixels in the 769th to 1024th columns that are adjacent to each other in the horizontal direction are replaced with the pixels in the odd numbered columns as in the period (d). The corresponding data signal is written.

  Eventually, according to the color sequential driving according to the second embodiment, as shown in FIG. 10, in the display area 100a, the images displayed in the first to 192th rows on the upper end side and the 577 to 768th rows on the lower end side. The resolution in the vertical direction is half that of the image displayed in the 193rd to 576th rows on the central side in the vertical direction and in the 257th to 768th columns on the central side in the horizontal direction. The horizontal resolution of the images displayed in the first to 256th columns on the left end side and the 769 to 1024th columns on the right end side is compared with the images displayed in the 257th to 768th columns on the central side in the horizontal direction. And halved.

  In the second embodiment, as compared with the first embodiment, in the period (b) of each subframe period, the data signal is sampled on the left end side and the right end side data line two columns at a time. (B) is shortened. Therefore, in the second embodiment, the R, G, and B light emission periods can be secured longer by the amount corresponding to the shortened period (b), and thus the screen can be brightened.

In the second embodiment, in the period (d) and the period (f) in the period in which one of the scanning lines in the 193rd to 576th rows is selected, the gradations of the color components corresponding to the odd-numbered columns of pixels. However, pixels in even columns may be read out. Further, it may be read by alternately switching between odd columns and even columns for each frame period.
In the second embodiment, the same data signal is simultaneously sampled on two columns of data lines on the left end side and the right end side during a period in which any one of the scanning lines in the 193rd to 576th rows is selected. Sampling may be performed simultaneously on the data lines. Furthermore, the resolution in the horizontal direction may be reduced stepwise as it goes toward the left end side or the right end side.
In addition, the region for reducing the resolution in the horizontal direction may be a region other than the left end side or the right end.

<Summary>
FIG. 11 shows the result of comparing the brightness of the screen and the sense of resolution as evaluation items of the displayed image for the color sequential driving according to the first or second embodiment described above and the conventional driving shown in FIG. Shown in
As shown in this figure and as described above, in the first or second embodiment, the brightness of the screen is more advantageous than the conventional example, but the sense of resolution of the image is more disadvantageous than the conventional example. .
Therefore, when priority is given to the brightness of the screen over the sense of resolution, for example, when displaying a moving image, it is advantageous to apply the color sequential driving according to the first or second embodiment, and conversely, the screen When priority is given to resolution over brightness, for example, when displaying a still image, it is advantageous to apply color sequential driving according to a conventional example that can be realized even with the configuration shown in FIG.
For this reason, the color sequential drive to be applied is either the color sequential drive according to the first or second embodiment depending on whether the image to be displayed is a moving image or a still image, or the color sequential drive according to the conventional example If it is configured to select whether or not to apply, it is possible to display appropriately according to the image defined by the video signal Vid.

For example, as shown in FIG. 12, an image analysis circuit 50 that inputs a video signal Vid and analyzes whether an image to be displayed is a moving image or a still image is provided. Accordingly, the color sequential driving according to the first and second embodiments or the conventional example may be applied.
When the image analysis circuit 50 is provided in this way, it is possible to automatically adopt an appropriate color sequential driving method in accordance with the image defined by the video signal Vid.
Further, as shown in FIG. 13, a selection operator 60 such as a button switch or a selector is provided, and the control circuit 20 according to the selection result corresponds to the first, second embodiment, or the conventional example. Color sequential driving may be applied. Providing such a selection operator 60 makes it possible to employ a color sequential method that reflects the user's preferences.

In the above-described embodiment, the primary colors to be used are three colors of R, G, and B, and the frame period is divided into three subframe periods corresponding to these colors. It may be divided into four or more subframe periods corresponding to the primary colors to be used. For example, among R, G, and B, G is divided into YG (yellowish green) closer to the short wavelength and EG (emerald green) closer to the long wavelength, and these four colors correspond to the frame period. Then, it may be divided into four subframe periods.
When four or more primary colors are used, two or more dichroic prisms are required. In the case of using the above-described R, YG, EG, and B, another dichroic prism is arranged in the 9 o'clock direction of the dichroic prism 13 in FIG. 1, and YG and EG light is incident on two of them. Thus, the configuration may be such that it leads to the dichroic prism 13.
The present invention can be applied not only to the projection type that enlarges and projects the transmission image of the display panel 100 but also to the direct view type that switches the light source of the backlight for each primary color. Further, the pixel 110 is not limited to the transmissive type, and may be a reflective type.

It is a figure which shows the structure of the projector to which the drive method which concerns on 1st Embodiment is applied. FIG. 2 is a block diagram showing an electrical configuration of the projector. It is a figure which shows the structure of the pixel in the display panel of the projector. It is a figure which shows the drive method. It is a figure which shows the vertical scanning of the same driving method. It is a figure which shows the horizontal scanning of the drive method. It is a figure which shows the display by the drive method. It is a figure which shows the vertical scanning of the drive method which concerns on 2nd Embodiment. It is a figure which shows the horizontal scanning of the drive method. It is a figure which shows the display by the drive method. It is a figure which shows the comparison with the drive method which concerns on embodiment, and the conventional drive method. It is a figure which shows the structure of the projector to which an application and a modification are applied. It is a figure which shows the structure of the projector to which an application and a modification are applied. It is a figure which shows the conventional drive method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Projector, 11R, 11G, 11B ... LED, 20 ... Control circuit, 30 ... Image processing circuit, 100 ... Display panel, 105 ... Liquid crystal, 120 ... Liquid crystal element, 130 ... Y driver, 140 ... X driver

Claims (9)

A plurality of pixels each having a transmittance or a reflectance according to the written information;
Irradiating means for irradiating the plurality of pixels with light of any one of at least three primary colors different from each other;
With
Dividing the unit period into subframe periods corresponding to the primary colors,
In each sub-frame period, wherein the plurality of pixels, write the information of the primary color component corresponding to the sub-frame period, the operation of writing the same information simultaneously select two or more adjacent pixels, predetermined By repeating over a specific area, the image of the primary color component is formed with different resolutions depending on the position,
After the writing in one subframe period, before the writing in the next subframe period, the irradiating means irradiates the light of the primary color corresponding to the one subframe period to the plurality of pixels. A driving method of the electro-optical device. The method of driving an electro-optical device according to claim 1, wherein the upper and lower resolutions of the image are lower than the resolution of the central portion. The method for driving an electro-optical device according to claim 1, wherein a resolution of a peripheral portion of the image is lower than a resolution of a central portion. As the number of pixels is increased simultaneously selected, method of driving an electro-optical device according to claim 1, characterized in that reducing the resolution of the particular area. Each of the plurality of pixels is
Arranged corresponding to the intersection of a plurality of rows of scanning lines and a plurality of columns of data lines, and when the scanning lines are selected, the voltage of the data signal supplied to the data lines is written,
A pair of an odd-numbered scan line and an even-numbered scan line adjacent to the odd-numbered scan line are simultaneously selected in order in a predetermined direction,
When one set of odd-numbered and even-numbered scanning lines is selected at the same time, it is based on one of the information of two pixels corresponding to the intersection of the two scanning lines and one data line. The driving method of the electro-optical device according to claim 4 , wherein a voltage data signal is supplied to the one data line. Whether the image to be displayed is a moving image, depending on whether a still image, the driving method of the electro-optical device according to claim 1, characterized in that a switchable resolution of the specific area. The method of driving an electro-optical device according to claim 6 , wherein when the image to be displayed is a moving image, the resolution of the specific area is lowered as compared with a case where the image is a still image. As specified by the specifying means, a driving method of an electro-optical device according to claim 1, characterized in that a switchable resolution of the specific area. A plurality of pixels each having a transmittance or a reflectance according to the written information;
Irradiating means for irradiating the plurality of pixels with light of any one of at least three primary colors different from each other;
Dividing the unit period into subframe periods corresponding to the primary colors,
In each sub-frame period, wherein the plurality of pixels, write the information of the primary color component corresponding to the sub-frame period, the operation of writing the same information simultaneously select two or more adjacent pixels, predetermined A drive circuit that forms an image of the primary color component at different resolutions depending on the position by repeating over a specific area ,
After writing in one subframe period to the irradiation unit, before writing in the next subframe period, the irradiation unit emits primary color light corresponding to the one subframe period to the plurality of pixels. Control means for controlling to irradiate
An electro-optical device comprising:

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