JP2009109849A - Display device driving method and circuit, electro-optical device, and electronic apparatus - Google Patents

Abstract

In a field sequential method for driving a display device, image signal writing is diversified to enable high-quality image display.
A frame period is divided into field periods for each unit color, and further divided into first to nth subfield periods. In the first subfield period, a first subfield image having a first resolution that is inferior in resolution in at least the direction along the scanning line as compared with the original resolution of the field image is written with an image signal to be originally written for a part thereof. Next, in the second subfield period, in the second subfield image of the second resolution having a resolution superior to the first resolution, the other part excluding the part is an image signal to be originally written for the other part. Write in.
[Selection] Figure 5

Description

  The present invention includes a display device driving method and circuit for driving a display device by a field sequential (FS) method, an electro-optical device such as a liquid crystal device driven by the driving method, and the electro-optical device. It is related with the technical field of the electronic device comprised.

  In the field sequential (FS) system, in a display device, typically, one frame period for displaying a single color frame image has red (R), green (G), It is composed of three field periods for displaying each field image of three colors of blue (B). In each field period, after writing image data for each color to each pixel, the light source is turned on to supply the corresponding color light.

  For example, according to Patent Document 1, the display area is divided into a plurality of divided areas, and a plurality of light sources are arranged for each divided area. In each field period, after each scanning line in the segmented region is selected and image data has been written to the corresponding pixel, the light source is turned on. However, in this case, the brightness of the adjacent light sources is different, thereby causing luminance unevenness at the boundary between the divided areas, degrading the display quality of the color image, and complicating the operation control of each of the plurality of light sources. is there.

  On the other hand, Patent Document 2 discloses a technique for ensuring a longer lighting period of a light source in each field period without arranging a plurality of light sources. More specifically, each field period is divided into first and second subfield periods, and after writing image data for displaying a low-resolution image is performed in the first subfield period, While the light source is turned on in the subfield period, the lacking image data is complementarily written in the low resolution image in the first subfield period, and the high resolution image is displayed.

  According to Patent Document 2, two pixel rows are simultaneously selected in the first subfield, and image data of one pixel row is written. In the second subfield, one of the other pixel rows is written. The image data of the pixel row is written.

JP 2002-211702 A JP 2006-163358 A

  However, according to the technique disclosed in Patent Document 2, depending on the type of display device, the image to be displayed, and the like, for example, as described above, the image data is not limited to being written every two pixel rows. There is a technical problem that a situation that is much more appropriate for writing image data (that is, a situation where high-quality image display can be performed more easily) can occur.

  In addition, image data corresponding to more pixel rows may be written in the second subfield or subsequent subfields as compared to the first subfield. Therefore, in the second subfield or later, it is necessary to increase the scanning speed or the image data to be supplied has to be complicated and sophisticated. is there.

  The present invention has been made in view of the above-described problems, for example, and a display device driving method for driving a display device by an FS method, which enables high-quality image display by diversifying writing of image signals. It is an object to provide a circuit, an electro-optical device, and an electronic apparatus including the circuit.

In order to solve the above problems, a driving method of a display device of the present invention includes a plurality of scanning lines and data lines intersecting each other, a plurality of pixel portions formed corresponding to the intersection of the scanning lines and data lines, A display device driving method for driving a display device including a light source capable of supplying light corresponding to a plurality of unit colors to the pixel unit in a time-sharing manner, wherein a frame period corresponding to a frame image includes the frame image. It is divided into field periods for each unit color corresponding to the field image for each unit color, and the field period is divided into first to nth (where n is a natural number of 2 or more) subfield periods. In the first subfield period, the resolution of the first resolution is lower than the original resolution of the field image at least in the first direction along the scanning line. A scanning signal is supplied to the scanning line and the data line is supplied to the data line so that a subfield image is written to the plurality of pixel portions while writing a part of the first subfield image with the image signal to be originally written. The resolution in at least one of the first direction and the second direction along the data line is superior to the first resolution in the first step of supplying an image signal and the second subfield period. At the same time, the other portions of the second subfield image having the second resolution lower than the original resolution excluding the portion are written in the plurality of pixel portions while the other portions are written with the image signal to be originally written. A second step of supplying the scanning signal to the scanning line and supplying the image signal to the data line so as to write Equipped with a.

  According to the display device driving method of the present invention, a display device which is, for example, a liquid crystal device is driven by the FS method as follows. Here, in the FS system according to the present invention, as a premise, the frame period is divided into, for example, field periods for each unit color of RGB. Further, the field period is divided into first to nth subfield periods. That is, for example, a frame image, which is a full-color image of RGB, is composed of a plurality of field images, which are single-color images for each RGB, in a time-division manner. Displayed as a result.

  First, in the first step, the image signal is supplied to the data line by the data line driving means or the image signal supplying means while the scanning signal is supplied to the scanning line by the scanning line driving means, for example, in the first subfield period. The first subfield image is written in the plurality of pixel portions. Here, the first subfield image has at least the first resolution along the scanning line as compared with the original resolution of the field image, that is, the original resolution defined by the number of data lines × the number of scanning lines (or the total number of pixels). The first resolution is inferior in the direction (that is, the direction intersecting the data lines or the X direction). When such a first subfield image is written, a part of the first subfield image is written with an image signal to be originally written. In other words, when the first subfield image is written, the other part of the first subfield image is an image signal that should be originally written in one part and not originally written in the other part. Written in. Therefore, the resolution of the entire area of the first subfield image is determined according to the proportion of the above-mentioned part.

  Here, for example, in an image that can be inspected by humans such as a landscape, a human figure, an animation, and a computer image, a difference in luminance and color of an image to be displayed between a plurality of pixels arranged in the first direction is generally small. Therefore, even if such a low-resolution first subfield image is displayed by supplying light from the light source at this point or after the subsequent second step, it can be understood visually. It becomes an image.

  Preferably, light is not supplied from the light source during the first step, and such a low resolution image may not actually be displayed.

  Subsequently, in the second step, in the second subfield period, for example, an image signal is supplied to the data line by the data line driving means or the image signal supply means while the scanning signal is supplied to the scanning line by the scanning line driving means. The second subfield image is written in the plurality of pixel portions. Here, the second subfield image has superior resolution in at least one of the first direction and the second direction along the data line (that is, the direction crossing the scanning line or the Y direction) as compared with the first resolution. At the same time, it has a second resolution lower than the original resolution.

  When such a second subfield image is written, the other parts of the second subfield image excluding a part are written with an image signal that should be originally written for the other part. In other words, when the second subfield image is written, “another part” in the second subfield image should be originally written in a part and should be originally written in the “further part”. With no image signal, the state of being temporarily written is continued. Alternatively, it is temporarily written with an image signal that should be originally written in another portion and should not be written in the “other portion”. Therefore, in any case, the resolution of the entire area of the second subfield image is determined according to the proportion of the above-described part and other parts.

  As described above, the resolution after the second step is improved to be close to the resolution of the original field image in at least one direction as compared with the resolution after the first step. Therefore, by supplying light at this time, it is possible to display a subfield image that significantly exceeds the resolution immediately after the first step.

  Note that such an image may not actually be displayed by not supplying light during the second step. That is, a subfield image that is superior to the resolution immediately after the second step may be displayed by supplying light after further increasing the resolution after the third subfield. However, if the light supply by the light source is delayed, the display image becomes dark. Therefore, it is only necessary to determine from which time point the light is supplied according to the device specifications and requests regarding the resolution and brightness.

  As described above, the display device can be driven so that high-quality image display by the FS method can be performed by relatively reducing the scanning speed in the direction along the scanning line while diversifying the writing of the image signal.

  In one aspect of the driving method of the display device of the present invention, the resolution in the at least one direction is superior to the second resolution and the resolution in the Lth (where L is a natural number of 3 or more) subfield period is In the L-th subfield image of the L-th resolution which is lower than the original resolution, another part excluding the part and the other part is written with the image signal to be originally written for the further part. The method further includes a subsequent step of supplying the scanning signal to the scanning line and supplying the image signal to the data line so as to write to the plurality of pixel portions, and the subsequent step includes the first step for each field period. The process is repeated until an L subfield image is written with the image signal that should be originally supplied for all of the plurality of pixel portions.

  According to this aspect, in the subsequent process, in the Lth subfield period (for example, the third, fourth,..., Nth subfield period), for example, data is supplied while the scanning signal is supplied to the scanning line by the scanning line driving unit. The image signal is supplied to the data line by the line driving unit or the image signal supply unit, so that the Lth subfield image is written in the plurality of pixel portions. Here, the L-th subfield image has an L-th resolution which is superior in resolution in at least one direction as compared with the second resolution and is equal to or lower than the original resolution.

  When such an L-th subfield image is written, an “other part” excluding a part and other parts in the L-th subfield image is an image to be originally written with respect to the “further part”. Written in signal. Therefore, the resolution of the entire area of the Lth subfield image is determined in accordance with the above-described part, other part, and the ratio occupied by the other part. In other words, the resolution is improved as the number of temporarily written pixel portions is reduced.

  Such a subsequent process is repeatedly executed until the L-th subfield image is written with an image signal to be originally supplied for all of the plurality of pixel portions, and the image signal to be displayed and the pixel portion are properly matched. However, the later the subfield period, the larger the number, and finally, all the pixel portions are matched. In other words, the number of temporarily written pixel portions gradually decreases. That is, finally, a subfield image having a resolution equal to the original resolution is displayed.

  Therefore, by supplying light at an arbitrary time point in the subsequent process, it is possible to display a subfield image that significantly exceeds the resolution immediately after the first process. In other words, during the same field period, the resolution gradually improves visually as line scanning is performed for each subfield period in the subsequent process. Therefore, by increasing the scanning speed, the presence of the subfield image immediately after the first step (or in addition to the presence of the subfield image immediately after the second step) gives the impression of low resolution visually. It is also possible not to have it. In this way, high-quality image display by the FS method is possible.

  In another aspect of the display device driving method of the present invention, the second step writes only the other portion in the second subfield period.

  According to this aspect, the second process should be originally written in the other part only in the second subfield period, except for the other part except the part written by the image signal that should be originally written in the first process. Write with image signal. That is, for “other parts” excluding these parts and other parts, the image signal temporarily written in the first subfield period is held as it is. As described above, the provisional write operation only needs to be performed in the first subfield period, so that the write load is reduced as a whole.

  In this aspect, in the first step, in the first subfield period, m of the data lines is synchronized with supplying the scanning signal to the scanning lines (where m is a natural number of 2 or more). The image signals corresponding to the i-th (where i is a natural number less than or equal to m) data lines included in a group of data lines are collectively supplied for each group, and the second step includes the second sub-line. In synchronization with the supply of the scanning signal to the scanning line during the field period, the image signal corresponding to the jth data line (where j is a natural number less than m different from i) included in the group, You may comprise so that it may supply to the said jth data line for every said group.

  With such a configuration, the image signal may be supplied in a unit of a group of a plurality of m data lines that are adjacent to each other in the first subfield period. For this reason, the drive frequency of an image signal can be reduced according to the value of m. Furthermore, the driving method can be realized with a relatively simple configuration such as sampling image signals for each group simultaneously. In particular, it is sufficient to supply image signals to all data lines included in the group simultaneously in the first step, and to supply image signals to one data line included in the group in the second step and thereafter.

  In another aspect of the driving method of the display device of the present invention, the second step includes, during the second subfield period, a remaining part excluding the part and the other part in the second subfield image, The other portion is written with the image signal that should be originally written.

  According to this aspect, in the second step, in the second subfield period, a part written with the image signal that should be originally written in the first step and another part written with the image signal that should be originally written in the second step Also for the “remaining portion” except for the provisional writing again in the second step. That is, for each pixel portion in the remaining portion, provisional writing is performed in the first step, and provisional writing is performed again in the second step. If the provisional writing operation is repeated as described above, the image signal on which the provisional writing is performed is an image signal with a value closer to the original image signal because it is an image signal for a pixel portion in the vicinity. Is possible. That is, it is possible to improve the resolution after the second subfield as compared with the mode in which provisional writing is performed only in the first step described above.

  In this aspect, in the first step, in the first subfield period, m of the data lines is synchronized with supplying the scanning signal to the scanning lines (where m is a natural number of 2 or more). The image signals corresponding to the i-th (where i is a natural number less than or equal to m) data lines included in a group of data lines are collectively supplied for each group, and the second step includes the second sub-line. In synchronization with the supply of the scanning signal to the scanning line during the field period, the image signal corresponding to the jth data line (where j is a natural number less than m different from i) included in the group, The i-th data line may be excluded from the group and the remaining groups including the j-th data line may be supplied together.

  With such a configuration, the image signal may be supplied in a unit of a group of a plurality of m data lines that are adjacent to each other in the first subfield period. For this reason, the drive frequency of an image signal can be reduced according to the value of m. Furthermore, the driving method can be realized with a relatively simple configuration such as sampling image signals for each group simultaneously. In particular, it is sufficient to supply image signals simultaneously to all data lines included in the group in the first step, and to supply image signals simultaneously to m−1 data lines included in the group in the second step and thereafter.

  In another aspect of the driving method of the display device of the present invention, the first step is inferior in resolution in both the first direction and the second direction as the first subfield image compared to the original resolution. In order to write a block unit image in which the image signal is written for each block unit to the plurality of pixel units, the scan signal is supplied to the scan line and the image signal is supplied to the data line. In the step, the scanning signal is supplied to the scanning line and the image signal is supplied to the data line so that the other part is written in the plurality of pixel units for each block unit.

  According to this aspect, first, in the first step, the block unit image is written. Here, the “block unit image” corresponds to a plurality of data lines and a plurality of scanning lines. For example, a (where a is a natural number of 2 or more) rows × m (where b is a natural number of 2 or more). ) It is composed of pixels in a column. In this case, the block image matches pixel areas corresponding to m data lines adjacent to each other and a scanning lines adjacent to each other. Subsequently, in the second step, an image signal is newly written for a part of each block unit. Thereby, the resolution in each block is improved. Thus, by making the low-resolution first subfield image a block unit image, the low-resolution image is not unilaterally blurred in the vertical or horizontal direction, but is well-balanced in both the vertical and horizontal directions. A more natural blurred image can be obtained. In addition, the drive frequency can be lowered in a balanced manner for both the data line drive and the scan line drive instead of unilaterally reducing the drive frequency for only one of the data line drive and the scan line drive. This is advantageous.

  In another aspect of the driving method of the display device of the present invention, in each of the first to n-th subfield periods, the scanning speed related to the line scanning in the direction along the data line is constant.

  According to this aspect, since it is sufficient to carry out at a constant scanning speed in each subfield period, the apparatus configuration and control operation relating to the supply of the scanning signal can be simple or easy. For example, if an enable signal described later is used, line scanning at a constant scanning speed can be easily performed.

  In each of the first to n-th subfield periods, the scanning speed related to the horizontal scanning in the direction along the scanning line may be constant.

  In another aspect of the display device driving method of the present invention, the light is not supplied by the light source during the first subfield period, and the light is supplied by the light source after the second subfield period. .

  According to this aspect, in the first subfield period in which the resolution in the subfield image is the lowest, image display is not performed by not supplying light from the light source. Subsequently, after the second subfield period in which the resolution of the subfield image is significantly increased, light is supplied from the light source to perform image display. Therefore, it is possible to achieve both the resolution and brightness appropriately in practice.

  In order to solve the above problems, a driving circuit of a display device of the present invention includes a plurality of scanning lines and data lines that intersect with each other, a plurality of pixel portions that are formed corresponding to the intersection of the scanning lines and data lines, A display device driving circuit for driving a display device including a light source capable of supplying light corresponding to a plurality of unit colors to the pixel unit in a time-sharing manner, wherein a frame period corresponding to a frame image has the frame image It is divided into field periods for each unit color corresponding to the field image for each unit color, and the field period is divided into first to nth (where n is a natural number of 2 or more) subfield periods. In the first subfield period, the resolution of the first resolution is lower than the original resolution of the field image at least in the first direction along the scanning line. A scanning signal is supplied to the scanning line and the data line is supplied to the data line so that a subfield image is written to the plurality of pixel portions while writing a part of the first subfield image with the image signal to be originally written. The first driving means for supplying an image signal and the resolution in at least one of the first direction and the second direction along the data line in the second subfield period compared to the first resolution. The plurality of pixel units while writing the other part of the second subfield image of the second resolution that is superior and lower than the original resolution except the part with the image signal to be originally written for the other part. To supply the scanning signal to the scanning line and to supply the image signal to the data line. And a dynamic means.

  The display device driving circuit according to the present invention reduces the scanning speed in the direction along the scanning line while diversifying the writing of the image signal, as in the above-described driving method of the display device according to the present invention. High-quality image display by the method becomes possible.

  The display device drive circuit of the present invention can also adopt various aspects similar to the various aspects of the display device drive method of the present invention described above.

  In order to solve the above-described problems, an electro-optical device according to the present invention includes the above-described display device driving circuit according to the present invention, the scanning lines and data lines, the pixel portion, and the light source.

  According to the electro-optical device of the present invention, like the above-described drive circuit of the display device of the present invention, the writing speed of the image signal is diversified, and the scanning speed is relatively decreased in the direction along the scanning line. High-quality image display by the method becomes possible.

  In order to solve the above-described problems, an electronic apparatus according to the present invention includes the above-described electro-optical device according to the present invention.

  According to the electronic apparatus of the present invention, since the electro-optical device of the present invention described above is included, a projection display device, a mobile phone, an electronic notebook, a word processor, and a viewfinder that can perform high-quality display. Various electronic devices such as a video tape recorder, a workstation, a videophone, a POS terminal, and a touch panel can be realized.

  Such an operation and other advantages of the present invention will become apparent from the best mode for carrying out the invention described below.

  Hereinafter, embodiments of a driving method and circuit according to the present invention, an electro-optical device driven by the driving method according to the present invention, and an electronic apparatus will be described with reference to the drawings. In the following embodiments, a TFT active matrix driving type liquid crystal device with a built-in driving circuit will be described as an example of an electro-optical device which is an example of a display device.

<First Embodiment>
First, the overall configuration of the liquid crystal device will be described with reference to FIGS. FIG. 1 is a block diagram showing the overall configuration of the liquid crystal device, and FIG. 2 is a block diagram showing the electrical configuration of the liquid crystal panel.

  As shown in FIG. 1, the liquid crystal device includes a liquid crystal panel 100, a light source 200, a controller 500, a frame memory 600, and a power supply circuit 700 as main parts.

  The controller 500 includes a logical operation circuit such as a CPU (Central Processing Unit). Specifically, the controller 500 includes an image signal generation circuit 502, a timing control circuit 504, and a light source control circuit 506.

  The controller 500 is supplied with a horizontal synchronization signal Hs and a vertical synchronization signal Vs, a dot clock DCLK, and display data R-DATA, G-DATA, and B-DATA. These various supply signals are generated by, for example, an external device (not shown) such as a video deck outside the liquid crystal device, or a circuit (not shown) in the liquid crystal device based on a source signal from such an external device. And supplied to the controller 500.

  The image signal generation circuit 502 is supplied with a horizontal synchronization signal Hs, a vertical synchronization signal Vs, a dot clock DCLK, and display data R-DATA, G-DATA, and B-DATA.

  Here, in the present embodiment, as an example, display data R-DATA, G-DATA, and B-DATA are R, G, B as field images of a plurality of unit colors constituting one color frame image. It is assumed that the image data is for displaying field images of the three colors. That is, in this case, display data R-DATA for displaying an R image (that is, an R field image), display data G-DATA for displaying a G image (that is, a G field image), and a B image (that is, a B field image). ) Is displayed to the controller 500.

  For example, the image signal generation circuit 502 generates R, R, and R for each frame (that is, frame period) for displaying one color frame image based on display data R-DATA, G-DATA, and B-DATA. Three types of field data (that is, image data indicating a field image) for displaying each image of G and B sequentially for each field are generated. The image signal generation circuit 502 temporarily stores the generated three types of field data in the frame memory 600, and among the three types of field data in each subfield constituting one field, the corresponding color (R, G, Field data for displaying an image of one color of B) is read out in a predetermined order for line scanning.

  The image signal generation circuit 502 performs a predetermined type of processing on the read one type of field data, and synchronizes with a cycle in which the scanning signal is supplied to the scanning line, for each pixel row along the scanning line. For example, the first or second image signal Vd1 or Vd2 is generated for each scanning line. As the predetermined type of processing here, for example, the potential of the first or second image signal Vd1 or Vd2 is changed to a predetermined period (for example, a period in which a scanning signal is supplied to one scanning line, one subfield period, Alternatively, the first or second image signal Vd1 or Vd2 is output after inversion to a positive polarity (+) and a negative polarity (−) with respect to a predetermined reference potential in one field cycle and one frame cycle).

  The “first image signal Vd1” is used to display a subfield image having a low resolution in at least the X direction along the scanning line from a series of image signals Vd constituting the field image, as will be described later. This is an image signal generated for one subfield. On the other hand, the “second image signal Vd2” is used for the second and subsequent subfields in order to continuously display a subfield image that complements a low-resolution subfield image from a series of image signals Vd constituting the field image. Are generated image signals. However, the image signal may be one type or one series (that is, only one series of image signals Vd constituting the field image) by devising the sampling method of the image signal in the sampling circuit. .

  The timing control circuit 504 is configured to output various timing signals. Specifically, the timing control circuit 504 generates a Y clock signal CLY (and an inverted Y clock signal CLYinv that is an inverted signal thereof) and an X clock signal CLX based on the horizontal synchronization signal Hs, the vertical synchronization signal Vs, and the dot clock DCLK. (And an inverted X clock signal XCLinv that is an inverted signal thereof), a Y start pulse DY and an X start pulse DX are generated. Further, the timing control circuit 504 generates, for example, two types of enable signals ENBx1 and ENBx2 that determine the output timing of the image signals Vd1 and Vd2 to the data lines as described later.

  These various timing signals are output from the timing control circuit 504, and are used not only in each part in the controller 500 but also in each part of an internal drive circuit mounted on the liquid crystal panel 100 described later.

  In addition, the light source 200 is not shown in detail for its internal structure, but as a plurality of unit colors, each of the three colors R, G, B is provided for each of R, G, B. The corresponding light is configured to be supplied to each pixel portion of the liquid crystal panel 100 in a time-sharing manner. Specifically, the light source 200 includes, for example, a plurality of light emitting diodes (LEDs), and the plurality of LEDs correspond to R (red), G (green), and B (blue), respectively. Light is emitted in a time division manner. That is, the plurality of LEDs periodically emit light so that the light emission periods do not overlap each other. The emitted light is combined by, for example, a combining prism, and is irradiated onto the liquid crystal panel 100. A plurality of lights having different color tones may be emitted from one light source 200 in a time division manner.

  The light source control circuit 506 controls the operation of the light source 200 in each field in one frame.

  The power supply circuit 700 supplies a common power supply having a predetermined common potential LCC to the liquid crystal panel 100. In the liquid crystal panel 100, for example, a counter electrode is formed so as to be opposed to a pixel electrode provided for each pixel unit (details will be described later), but a common power supply LCC is supplied from the power supply circuit 700 to the counter electrode. . Note that the power supply circuit 700 may be provided in the controller 500.

  Next, the electrical configuration of the liquid crystal panel 100 will be described with reference to FIG.

  In FIG. 2, a plurality of scanning lines 11a and a plurality of data lines 6a intersect with each other in the image display area 10a of the liquid crystal panel 100, and pixel portions corresponding to pixels corresponding to these intersections are arranged in a matrix. Is provided.

  In FIG. 2, in the peripheral area located around the image display area 10a, the “first driving means” and the “second driving means” according to the present invention together with the controller 100 or the image signal generation circuit 502 shown in FIG. A data line driving circuit 101 and a scanning line driving circuit 104 which constitute an example are provided.

  The scanning line driving circuit 104 is supplied with the Y clock signal CLY (and the inverted Y clock signal CLYinv (not shown)) and the Y start pulse DY from the timing control circuit 504. When the Y start pulse DY is input, the scanning line driving circuit 104 sequentially generates a scanning signal at a timing based on the Y clock signal CLY and the inverted Y clock signal CLYinv and outputs the scanning signal to the scanning line 11a.

  The data line driving circuit 101 is supplied with an X clock signal CLX (and an inverted X clock signal CLXinv (not shown)), an X start pulse DX, and two types of enable signals ENBx1 and ENBx2 from the timing control circuit 504. The first or second image signal Vd1 or Vd2 is supplied from the image signal generation circuit 502. Alternatively, a series of image signals Vd may simply be supplied.

  In the data line driving circuit 101, the X start pulse DX and the X clock signal CLX (and the inverted X clock signal CLXinv) are supplied, whereby the first or second image signal Vd1 or Vd2 is supplied to each data line 6a. The basic operation of sequentially supplying can be performed. Further, the data line driving circuit 101 outputs the first image signal Vd1 to the first subfield to the data line 6a at the timing based on the two kinds of enable signals ENBx1 and ENBx2, and in the order as described later, and the second subfield. Thereafter, the second image signal Vd2 is output to the data line 6a.

  In FIG. 2, a common potential LCC supplied as a common power supply from the power supply circuit 700 is supplied to an input terminal (upper and lower conduction terminal described later) 106 that is electrically connected to the counter electrode. The common potential LCC serves as a reference potential for the counter electrode for appropriately holding a potential difference from the pixel electrode 9a of each pixel portion to form a liquid crystal holding capacitor.

  Here, a pixel electrode 9a and a TFT 30 are formed in each of a plurality of pixel portions formed in a matrix that forms the image display region 10a of the liquid crystal device. The TFT 30 is electrically connected to the pixel electrode 9a, and performs switching control of the pixel electrode 9a during operation of the liquid crystal device. The data line 6 a is electrically connected to the source of the TFT 30, and the scanning line 11 a is electrically connected to the gate of the TFT 30. The pixel electrode 9 a is electrically connected to the drain of the TFT 30.

  When the scanning signal from the scanning line driving circuit 104 is applied in a pulse manner to the scanning line 11a at a predetermined timing, the TFT 30 as a switching element is supplied from the data line 6a by closing the switch for a certain period. The first or second image signal Vd1 or Vd2 is written to the pixel electrode 9a at a predetermined timing. The applied voltage corresponding to the first or second image signal Vd1 or Vd2 of a predetermined level written in the liquid crystal as an example of the electro-optical material via the pixel electrode 9a is held for a certain period with the counter electrode.

  The liquid crystal modulates light and enables gradation display by changing the orientation and order of the molecular assembly depending on the applied voltage level. In the normally white mode, the transmittance for incident light is reduced according to the voltage applied in units of each pixel, and in the normally black mode, the light is incident according to the voltage applied in units of each pixel. The transmittance for light is increased, and light having a contrast corresponding to an image signal is emitted from the liquid crystal device as a whole.

  In order to prevent the first or second image signal Vd1 or Vd2 held here from leaking, a storage capacitor 70 is added in parallel with the liquid crystal capacitor formed between the pixel electrode 9a and the counter electrode. The storage capacitor 70 is a capacitive element that functions as a storage capacitor that temporarily holds the potential of each pixel electrode 9a in response to the supply of the first or second image signal Vd1 or Vd2. One electrode of the storage capacitor 70 is connected to the drain of the TFT 30 in parallel with the pixel electrode 9a, and the other electrode is connected to the capacitor line 300 with a fixed potential so as to have a constant potential. According to the storage capacitor 70, the potential holding characteristic in the pixel electrode 9a is improved, and display characteristics such as contrast improvement and flicker reduction can be improved.

  Next, the basic principle of the driving method by the SF method of the liquid crystal device according to this embodiment will be described with reference to FIG. FIG. 3 schematically shows a driving method by the SF method of the liquid crystal device according to the present embodiment.

  As shown in FIG. 3, one frame (that is, one frame period) for displaying one color frame image is used for displaying each of the three colors R, G, and B over time. It is divided into an R field (ie, R field period), a G field (ie, G field period), and a B field (ie, B field period). That is, in the present embodiment, as a typical example, in order to display a single color frame image, field images of three colors of R, G, and B as a plurality of unit colors are sequentially displayed in each field. Shall be displayed.

  Each of the R field, the G field, and the B field is further divided into a plurality of (first to nth) subfields. Here, in the following, for the sake of simplicity of explanation, a case where one field is divided into first and second subfields (n = 2) RSF1 and RSF2, or GSF1 and GSF2, or BSF1 and BSF2 will be described.

  Next, a detailed configuration of the data driving circuit 101 shown in FIG. 2 will be described with reference to FIG. FIG. 4 shows an example of the configuration of the data line driving circuit.

  In FIG. 4, the main part of the data line driving circuit 101 includes an image signal supply circuit 112 and an AND circuit 114 provided corresponding to each data line 6a. The image signal supply circuit 112 is supplied with the X start pulse DX, the X clock signal CLX (and the inverted X clock signal CLXinv), and the first or second image signal Vd1 or Vd2.

  Here, in the present embodiment, as shown in FIG. 2, as an example, a plurality of data lines 6a wired to the image display area 10a are grouped into two data lines 6a, that is, two data lines are provided for each data line. The first or second image signal Vd1 or Vd2 can be supplied for each group of data lines 6a. In this case, half of the number of 2N data lines 6a-1 to 6a-2N (N is a natural number of 1 or more), that is, N first or second image signals Vd11 to Vd1N or Vd21 to Vd2N are image signals. It is supplied to the supply circuit 112.

  In the image signal supply circuit 112, when the X start pulse DX is input, the N first image signals Vd11 to Vd1N are output in the first subfield at a timing based on the X clock signal CLX and the inverted X clock signal CLXinv. Output to 2N data lines 6a-1 to 6a-2N. In the second subfield and subsequent subfields, N second image signals Vd21 to Vd2N are output to 2N data lines 6a-1 to 6a-2N, respectively.

  The data line 6a in each group of data lines 6a is selected by the corresponding AND circuit 114 based on one or both of the two types of enable signals ENBx1 and ENBx2, and the first or second image signal first Alternatively, the second image signals Vd11 to Vd1N or Vd21 to Vd2N are supplied.

  Next, the operation of the liquid crystal device in each of the R field, G field, and B field shown in FIG. 3 will be described with reference to FIGS. FIG. 5 is a schematic diagram for explaining supply of image signals to each pixel group in one field. FIG. 6 schematically shows how the image signal is written in the first subfield in the image display area (upper stage), and further shows how the image signal is written in the second subfield in the image display area. (Lower). FIG. 7 is a timing chart showing temporal changes of various signals for driving the pixel group in one field.

  Hereinafter, in order to simplify the description, a case where the total number of the data lines 6a is 8 (that is, N = 4) as shown in FIG. 4 will be described.

  As shown in FIG. 5A or 5B, the plurality of pixel portions (see FIG. 2) in the image display area 10a are divided along the data line 6a for convenience in performing drive control. . Accordingly, when displaying a low-resolution image, the pixel groups 90 to which the same image signal is supplied are arranged in the image display region 10a in a stripe shape in the direction along the scanning line 11a. As an example, for each pixel group 90, one pixel group 90 includes a pixel portion corresponding to one group of data lines 6a (that is, two data lines 6a).

  In FIGS. 5A and 5B, the numbers “1” to “8” given to the pixel groups 90-11 to 90-14 in each column are the pixel groups 90-11 of these four columns. The order in which the first and second image signals Vd11 to Vd14 and Vd21 to Vd24 in one field are supplied to ˜90-14 is shown. That is, in the order in which each of the first and second image signals Vd11 to Vd14 and Vd21 to Vd24 is supplied, the number “1” in the first field means that the number “1” is supplied first. "Means the second supply, and the numbers" 3 "to" 8 "also indicate the same order. This is the same for each drawing described later.

  As shown in FIGS. 6 and 7, or as described with reference to FIG. 3, one field is divided into first and second subfields SF1 and SF2.

  First, in the first subfield SF1, horizontal scanning for displaying a low-resolution image is performed on each scanning line in the order of “1” to “4” as shown in FIG. 5A. That is, as shown in the upper part of FIG. 6, in the image display area, a low resolution having two pixels corresponding to a group of two data lines surrounded by a thick line in FIG. Writing is performed. The resolution in this case is half that of the original resolution. In the upper left image display area in FIG. 6, the horizontal scanning in the order of “1” to “4” shown in FIG. At this time, among the two pixels forming the minimum unit surrounded by the thick line, only the pixel corresponding to the left side is to be supplied with the image signals Vd11, Vd12, Vd13 and Vd14 are written. That is, at this time, as shown in FIG. 7, the image signal generation circuit 502 shown in FIG. 1 belongs to the pixel groups 90-11 to 90-14 of each column based on one type of field data corresponding to one field. A first image signal Vd1 (that is, image signals Vd11, Vd12, Vd13, and Vd14) to be supplied to each pixel portion on the left side of the two pixel portions forming the minimum unit of display is generated. Then, these first image signals Vd1 are written in the respective pixel portions in response to the enable signals ENBx1 and ENBx2 becoming high level.

  In parallel with this, among the two pixels forming the minimum unit in the display, the image signal that should not be supplied to the pixel corresponding to the right side as indicated by the symbol “〃” attached thereto. Vd11, Vd12, Vd13, and Vd14 (but image signals that are similar to some extent because they are adjacent but close to each other) are temporarily written. Such horizontal scanning is sequentially performed for each row, and finally writing of low-resolution images is completed for all rows as in the upper right image display area in FIG.

  Subsequently, in the second subfield SF2, horizontal scanning for compensating for a low-resolution image is performed in the order of “5” to “8” for each scanning line as shown in FIG. 5B. That is, as shown in the lower part of FIG. 6, in the image display area, the right pixel (that is, the image signal that should not be originally supplied in the first subfield SF2) among the two pixels forming the minimum unit is temporarily written. Writing to compensate for the low-resolution image. In the lower left image display area in FIG. 6, horizontal scanning in the order of “5” to “8” shown in FIG. 5B is performed only once. At this time, among the two pixels forming the minimum unit surrounded by the thick line, the pixels corresponding to the left side are already supplied with the image signals Vd11 and Vd12 that are to be originally supplied, as indicated by the symbol “T” given thereto. , Vd13, and Vd14 are completed in the first subfield SF1. Thus, the image signals Vd21, Vd22, Vd23, and Vd24 that should be supplied are written to the pixels corresponding to the right side of the two pixels that form the minimum unit. That is, at this time, as shown in FIG. 7, the image signal generation circuit 502 shown in FIG. 1 belongs to the pixel groups 90-11 to 90-14 of each column based on one type of field data corresponding to one field. A second image signal Vd2 (that is, image signals Vd21, Vd22, Vd23, Vd24) to be supplied to each pixel portion on the right side is generated in the two pixel portions forming the minimum unit of display. Then, these second image signals Vd2 are written into the respective pixel portions in response to the enable signal ENBx2 becoming high level.

  Such horizontal scanning is sequentially performed for each row, and finally, writing in the low-resolution image is completed for all rows as in the lower right image display area of FIG.

  As described above with reference to FIGS. 3 to 7, it is possible to display a low-resolution image in the first subfield SF1, and further, in the second subfield SF2, a low-resolution image is compensated. It becomes possible.

  Particularly in the present embodiment, as shown in FIG. 7, until the writing period of the first image signals Vd11 to Vd14 in the first subfield SF1 starts and ends, the light source control circuit 506 shown in FIG. The light source 200 is turned off. Therefore, in the writing period of the first image signals Vd11 to Vd14, image display is not performed in the image display area 10a. In the subsequent writing period of the second image signals Vd21 to Vd24 in the second subfield SF2, the light source control circuit 506 shown in FIG. More specifically, the light source 200 is turned on when the writing period of the first image signals Vd11 to Vd14 ends. Therefore, in the writing period of the second image signals Vd21 to Vd24, low-resolution image display is performed in the image display area 10a. When the writing of the second image signals Vd21 to Vd24 is completed, an image display with the original resolution is performed in the image display area 10a as shown in the lower right of FIG.

  In FIG. 3 again, the liquid crystal device is driven in each of the R field, the G field, and the B field as described above with reference to FIGS. 4 to 7, so that the R image, the G image, and the B image are sequentially displayed. Are displayed in the image display area 10a. When such an image display is visually observed, the image is perceived as one color image in which the R image, the G image, and the B image are mixed due to the limit of temporal resolution in vision (human eye). Here, for each of the R image, the G image, and the B image, a pixel unit to which a voltage is applied based on provisional image signals in a plurality of pixel units from the start of lighting of the light source 200 to the end of each field. Therefore, the rate at which the low-resolution part is visually recognized becomes low. Therefore, the reduction in resolution in the images displayed in the first and second subfields is not so noticeable or hardly noticeable in the actual visual perception recognized as a single color image composed of three color images. it can.

  In addition, according to the present embodiment, the light of the color corresponding to each field from the common light source 200 is provided to the plurality of pixel units without disposing a plurality of light sources as disclosed in Patent Document 1. It is possible to supply and ensure a longer lighting period of the light source 200.

  Note that the R, G, and B fields can be arranged in a predetermined order on the time axis for each frame.

  Therefore, in the liquid crystal device according to the present embodiment, brighter and higher-definition display can be more easily performed by the FS method, and as a result, high-quality image display can be performed.

  Next, a modification of the present embodiment will be described with reference to FIGS. FIG. 8 is a diagram having the same concept as in FIG. 6 showing one driving method in the case where the minimum unit in display is three pixels along the scanning line according to one modification, and FIG. It is a figure of the same meaning as FIG. 8 which concerns on a modification.

  In the modification shown in FIG. 8, first, in the first subfield SF1, as shown in the upper part of FIG. 8, in the image display area, a group of three data lines each surrounded by a thick line in FIG. Low-resolution writing is performed using the corresponding three pixels as the minimum unit for display. The resolution in this case is one third of the original resolution. That is, in the image display area at the upper left in FIG. 8, horizontal scanning in units of groups in the order from left to right is performed only once. At this time, among the three pixels forming the minimum unit surrounded by the thick line, only the pixel corresponding to the left side is written with the image signal to be originally supplied, as indicated by the symbol “T” added thereto. In parallel with this, among the three pixels forming the smallest unit in the display, the pixels corresponding to the center and the right side should not be originally supplied, as indicated by the symbol “〃” attached thereto. An image signal (but an image signal that is similar to some extent because it is adjacent or close but close) is provisionally written. Such horizontal scanning in units of groups is sequentially performed for each row, and finally writing of low-resolution images is completed for all rows as in the upper right image display area in FIG.

  Subsequently, in the second subfield SF2, as shown in the middle part of FIG. 8, in the image display area, the center pixel (that is, should not be originally supplied in the first subfield SF2) among the three pixels forming the minimum unit. Writing that compensates for the low-resolution image is performed on one of the two pixels on which the image signal is provisionally written. That is, in the image display area at the left center in FIG. 8, horizontal scanning every two data lines from the left to the right is performed only once. At this time, among the three pixels forming the minimum unit surrounded by the thick line, the pixel corresponding to the left side is already written with the image signal to be originally supplied, as indicated by the symbol “T” given thereto. Completed in the first subfield SF1. Therefore, an image signal to be originally supplied is written to the pixel corresponding to the center among the three pixels forming the minimum unit. At this time, among the three pixels forming the minimum unit, the pixel corresponding to the right side is temporarily written in the first subfield.

  Subsequently, in the third subfield SF3, as shown in the lower part of FIG. 8, in the image display area, among the three pixels forming the minimum unit, the pixel on the right side (ie, should not be originally supplied in the first subfield SF2). Writing that compensates for the low-resolution image is performed on the other of the two pixels on which the image signal is provisionally written. That is, in the lower left image display area in FIG. 8, horizontal scanning every two data lines from left to right is performed only once. At this time, among the three pixels forming the minimum unit surrounded by the thick line, the pixels corresponding to the left side and the center of the image signal to be originally supplied as indicated by the symbol “T” given thereto are shown. Writing has been completed in the first subfield SF1 and the second subfield. Therefore, in the third subfield SF3, the image signal that should be originally supplied is written to the pixel corresponding to the right side among the three pixels forming the minimum unit.

  Such horizontal scanning is sequentially performed for each row, and finally, writing in which a low-resolution image is compensated for all pixels is completed as in the lower right image display area of FIG.

  In the case of the modification shown in FIG. 9, first, in the first subfield SF1, a low-resolution image is written in the same manner as in the modification of FIG.

  Subsequently, in the second subfield SF2, as shown in the middle part of FIG. 9, among the three pixels forming the minimum unit in the image display region, the center and right pixels (that is, should be originally supplied in the first subfield SF2). (Two pixels on which image signals that are not tentatively are temporarily written) are written to compensate for the low-resolution image. That is, horizontal scanning every other data line from the left to the right is performed only once in the image display area at the left center in FIG. At this time, among the three pixels forming the minimum unit surrounded by the thick line, the pixel corresponding to the left side is already written with the image signal to be originally supplied, as indicated by the symbol “T” given thereto. Completed in the first subfield SF1. Therefore, an image signal to be originally supplied is written to the pixel corresponding to the center among the three pixels forming the minimum unit. At this time, among the three pixels forming the minimum unit, the pixel corresponding to the right side is temporarily written again in the second subfield.

  Subsequently, in the third subfield SF3, as shown in the lower part of FIG. 9, in the image display area, among the three pixels forming the minimum unit, the right pixel (that is, should not be originally supplied in the second subfield SF2). The pixel in which the image signal has been provisionally written again is written to compensate for the low-resolution image. That is, in the lower left image display area in FIG. 9, horizontal scanning every two data lines from left to right is performed only once. At this time, among the three pixels forming the minimum unit surrounded by the thick line, the pixels corresponding to the left side and the center of the image signal to be originally supplied as indicated by the symbol “T” given thereto are shown. Writing has been completed in the first subfield SF1 and the second subfield. Therefore, in the third subfield SF3, the image signal that should be originally supplied is written to the pixel corresponding to the right side among the three pixels forming the minimum unit.

  Such horizontal scanning is sequentially performed for each row, and finally, writing in which a low-resolution image is compensated for all pixels is completed as in the lower right image display area of FIG.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a schematic diagram for explaining the supply of image signals to the pixel groups in the first subfield in the second embodiment, and FIG. 11 shows the second and subsequent subfields in the second embodiment. It is a schematic diagram for demonstrating supply of the image signal with respect to each pixel group in.

  In the second embodiment, each field is divided into first to fourth subfields, and a low-resolution image is displayed by grouping four data lines in the first subfield. It is different from the form. Hereinafter, only different points from the first embodiment will be described with reference to the drawings, and the same configurations and operations as those of the first embodiment will be referred to as appropriate in FIGS. 1 to 7 and redundant description will be omitted. .

  In this embodiment, the total number of data lines 6a is eight, and image data is written for each column of the two pixel groups 90-11 and 90-12 divided along the data line 6a. Will be described. In this case, the pixel group 90 in one column includes the pixel portions corresponding to the four data lines 6a as shown in FIG. 10 or FIG. One field is divided into first to fourth subfields SF1 to SF4 (n = 4).

  10 and 11, in the first subfield SF1, the image signal generation circuit 502 shown in FIG. 1 uses the two types of the second sub-fields in FIG. 10 for each of the two columns of pixel groups 90-11 and 90-12. One image signal Vd11 and Vd12 is generated.

  In the data line driving circuit 101 (see FIG. 4), two types of first image signals Vd11 and Vd12 are output from the image signal supply circuit 112, and one group is provided for the pixel groups 90-11 and 90-12 in each column. Is supplied to the data line 6a.

  In this embodiment, the data line driving circuit 101 (see FIG. 4) receives from the timing control circuit 504 (see FIG. 1) the data belonging to the group of data lines 6a belonging to the pixel group 90 in one column. Assume that four types of enable signals ENBx1 to ENBx4 are supplied to select each of the lines 6a.

  First, as shown in FIG. 10, in the first subfield SF1, the first first image signal Vd11 is supplied to the data line 6a belonging to the pixel group 90-11 in the first column. Subsequently, the second column image group 90-12 is supplied with the second second image signal Vd12 to the data line 6a belonging to the pixel group 90-12, and the horizontal scanning for one row is completed. This operation is sequentially performed for all the rows, that is, a single vertical scan is performed, and a low-resolution image is displayed.

  Subsequently, as shown in FIG. 11A, in the second subfield SF2, the second second image signal Vd21 is transmitted to the data line 6a belonging to the pixel group 90-11 in the first column. Supplied. Subsequently, the fourth pixel image 90-12 in the second column is supplied with the fourth second image signal Vd22 to the data line 6a belonging thereto, and the horizontal scanning for one row is completed. This operation is sequentially performed on all the rows, that is, the vertical scanning is performed in a single line, and an image with an improved resolution is displayed compared to immediately after the first subfield.

  Subsequently, as shown in FIG. 11B, in the third subfield SF3, the fifth second image signal Vd21 is transmitted to the data line 6a belonging to the pixel group 90-11 in the first column. Supplied. Subsequently, the pixel group 90-12 in the second column is supplied with the sixth second image signal Vd22 to the data line 6a belonging to the pixel group 90-12, and the horizontal scanning for one row is completed. This operation is sequentially performed on all the rows, that is, the vertical scanning is performed in a single line, and an image with further improved resolution than that immediately after the second subfield is displayed.

  Subsequently, as shown in FIG. 11C, in the fourth subfield SF4, the seventh second image signal Vd21 is transmitted to the data line 6a belonging to the pixel group 90-11 in the first column. Supplied. Following this, the eighth image signal Vd22 is supplied to the data line 6a belonging to the pixel group 90-12 in the second column, and the horizontal scanning for one row is completed. This operation is sequentially performed on all the rows, that is, the vertical scanning is performed in a row, and an image having the original resolution is displayed.

  As described above, according to the present embodiment, when image data is written for each column of the pixel group 90 including the pixel portions corresponding to the four data lines 6a, the same as in the first embodiment described above. Can benefit from.

  Of the second to fourth subfields SF2 to SF4, in the second and third subfields SF2 and SF3, in the pixel groups 90-11 and 90-12 of each column, the third and The same second image signals Vd21 and Vd22 may be supplied to the fourth data line 6a together with the fourth data line 6a and the third data line 6a. According to the latter, an image closer to the original resolution can be displayed every time one subfield passes from the second to the fourth subfields SF2 to SF4. Therefore, it is possible to prevent a lower resolution image from being perceived visually and improve visibility.

<Third Embodiment>
Next, a third embodiment of the present invention will be described with reference to FIGS. The third embodiment is different from the first embodiment in that a plurality of pixel portions are divided into blocks and the order of vertical scanning and horizontal scanning. Hereinafter, only different points from the first embodiment will be described with reference to the drawings, and the same configuration as the first embodiment will be described with reference to FIGS. 1 to 11 as appropriate, and FIGS. In FIG. 2, the same reference numerals are given, and redundant description may be omitted.

  FIG. 12 is a schematic diagram for explaining supply of image signals to each pixel group in one field in the third embodiment, and FIG. 13 shows pixel groups in one field in the third embodiment. It is a timing chart which shows a time-dependent change of the various signals for driving.

  Hereinafter, in order to simplify the description, the case where the total number of data lines 6a in FIG. 4 is six and the total number of scanning lines 11a shown in FIG. 2 is four will be described.

  In the third embodiment, as shown in FIG. 12, a plurality of pixel portions (see FIG. 2) in the image display area 10a are formed in a block shape along the data lines 6a and the scanning lines 11a for convenience in performing drive control. It is divided into Thereby, each pixel group 90 is arranged in the image display region 10a in a matrix in the direction along each of the scanning lines 11a and the data lines 6a. As an example, for each pixel group 90, one pixel group 90 includes a pixel portion corresponding to two data lines 6a. In this case, each of the three column pixel groups 90-11 to 90-13 includes a pixel portion corresponding to the two data lines 6a.

  In the third embodiment, one pixel group 90 may include one pixel portion. In this case, each pixel unit is driven dot-sequentially in the same manner as described below.

  The operation of the liquid crystal device in one field will be described for the third embodiment. In FIG. 13, one field is divided into, for example, first and second subfields SF1 and SF2, as described with reference to FIG.

  In the first subfield SF1, the image signal generation circuit 502 shown in FIG. 1 generates three types of first image signals Vd11 to Vd13 for each column for the pixel groups 90-11 to 90-13 in each column.

  In the data line driving circuit 101 (see FIG. 4), the first image signals Vd11 to Vd13 are sequentially output from the image signal supply circuit 112, and 2 corresponding to the pixel groups 90-11 to 90-13 in each column. The data lines 6a are supplied as a group. In FIG. 13, the data lines 6a belonging to the group are simultaneously selected in synchronization with the outputs of the first image signals Vd11 to Vd13 based on the two types of enable signals ENBx1 and ENBx2.

  As shown in FIGS. 12A and 13, in the first subfield SF1, the pixel group 90-11 in the first column includes one of the three types of first images on the data line 6a belonging thereto. A signal Vd11 is supplied. In the pixel group 90-11 in the first column, each pixel group 90 is scanned line-sequentially from the scanning line driving circuit 104 in the direction along the data line 6a during the period in which the first image signal Vd11 is supplied. Selection is made sequentially based on signals G1, G2, G3, and G4. Accordingly, the first image signal Vd11 is supplied from the first to the fourth to each of the pixel groups 90 belonging to the pixel group 90-11 in the first column. Then, in each of the pixel groups 90 belonging to the pixel group 90-11 in the first column, the first image signal Vd11 is written to each pixel portion.

  Following the pixel group 90-11 in the first column, as in the first column, for each of the pixel groups 90 belonging to the pixel group 90-12 in the second column, there are three types from the fifth to the eighth. One of the other first image signals Vd12 is supplied, and the remaining one of the three types from the ninth to the twelfth for each of the pixel groups 90 belonging to the pixel group 90-13 in the third column. A first image signal Vd13 is supplied. Then, in each of the pixel groups 90-12 and 90-13 in the second and third columns, the first image signals Vd12 and Vd13 are written in the pixel portions corresponding to the pixel groups 90.

  Therefore, in the pixel groups 90-11 to 90-13 in each column, the pixel portion corresponding to the first data line 6a can perform image display based on the image signal Vd1 that should be originally written.

  Therefore, in the first subfield SF1, it is possible to display a low-resolution image of one corresponding color among R, G, and B in the image display area 10a.

  Subsequently, in the second subfield SF2, in the data line driving circuit 101 (see FIG. 4), the second image signals Vd21 to Vd23 are sequentially output from the image signal supply circuit 112, and the pixel groups 90-11 of each column are output. Are supplied to the corresponding group of data lines 6a. In the pixel groups 90-11 to 90-13 in each column, the second data line 6a among the data lines 6a belonging to the group is a second image based on one of the two enable signals ENBx2 in FIG. The signals are selected in synchronization with the outputs of the signals Vd21 to Vd23.

  As shown in FIGS. 12B and 13, in the second subfield SF2, the pixel group 90-11 in the first column includes three types of data lines 6a in the group of data lines 6a. Among them, one kind of second image signal Vd21 is supplied. In the pixel group 90-11 in the first column, each pixel group 90 is sequentially selected based on the scanning signals G1, G2, G3, and G4 in the direction along the data line 6a during the period in which the second image signal Vd21 is supplied. Is done. Accordingly, the second image signal Vd21 is supplied from the thirteenth to the sixteenth to each of the pixel groups 90 belonging to the pixel group 90-11 in the first column. Then, in each of the pixel groups 90 belonging to the pixel group 90-11 in the first column, the second image signal Vd21 is written in the pixel portion corresponding to the second data line 6a.

  Following the pixel group 90-11 in the first column, as in the first column, the second of the group of data lines 6a is applied to each of the pixel groups 90 belonging to the pixel group 90-12 in the second column. The second image signal Vd22 of the other one of the three types from the 17th to the 20th is supplied via the data line 6a, and each of the pixel groups 90 belonging to the pixel group 90-13 in the third column is supplied. The remaining second type of the second image signal Vd23 is supplied from the 21st to the 24th through the second data line 6a of the group of data lines 6a. Then, in each of the pixel groups 90-12 and 90-13 in the second and third columns, the second image signals Vd22 and Vd23 are supplied and written to the pixel portion corresponding to the second data line 6a.

  Therefore, in the image display area 10a, after the writing of the second image signals Vd21 to Vd23 in the second subfield SF2 is completed, an image of one corresponding color among R, G, and B is originally stored in each pixel portion. It is possible to display at a high resolution.

  Therefore, also in the third embodiment as described above, the same benefits as in the first embodiment described above can be obtained.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described with reference to FIGS. The fourth embodiment is different from the first to third embodiments in that the plurality of pixel portions are divided not only along the data lines but also along the scanning lines. Hereinafter, only differences from the first to third embodiments will be described with reference to the drawings, and configurations similar to those of the first to third embodiments will be described with reference to FIGS. 1 to 7 as appropriate. 14 to 17 are denoted by the same reference numerals and redundant description may be omitted.

  First, a detailed configuration of the scanning line driving circuit according to the fourth embodiment will be described with reference to FIG. FIG. 14 shows an example of the structure of the scanning line driving circuit. In FIG. 2, the two scanning line driving circuits 104 facing each other across the image display region 10a preferably have the same configuration. Hereinafter, focusing on one of the two scanning line driving circuits 104, the configuration will be described in detail.

  In FIG. 14, the main part of the scanning line driving circuit 104 is provided corresponding to each scanning line 11a and a shift register 141 to which a Y clock signal CLY (and an inverted Y clock signal CLYinv) and a Y start pulse DY are input. AND circuit 142 to be included.

  In the fourth embodiment, two types of enable signals ENBy1 and ENBy2 are further generated and supplied to the scanning line drive circuit 104 in the timing control circuit 504 shown in FIG.

  In the scanning line driving circuit 104, for example, two scanning lines 11a are made into one group, and outputs SR1,..., SRm of the shift register 141 are made for each group of scanning lines 11a, and the scanning lines in each group. 11a is selected by the corresponding AND circuit 142 in accordance with the levels of the two types of enable signals ENBy1 and ENBy2, and supplied with scanning signals G1,..., G2m.

  In the present embodiment, in particular, in the first subfield SF1, the scanning signals G1 and G2 are simultaneously output based on the same output SR1. Similarly, scanning signals G3 and G4 are simultaneously output based on the same output SR2, and scanning signals G5 and G6 are simultaneously output based on the same output SR3. As described above, two scanning lines are simultaneously selected in the first subfield SF1. On the other hand, in the second subfield SF2 to the fourth subfield, the scanning signal G1 or G2 is output based on the output SR1. Similarly, the scanning signal G3 or G4 is output based on the output SR2, and the scanning signal G5 or G6 is output based on the output SR3. As described above, in the second subfield SF1 to the fourth subfield, scanning lines are selected one by one and every other scanning line.

  In the fourth embodiment, the data line driving circuit 101 is not limited to the configuration described with reference to FIG. 4, and each data line is based on the X start pulse DX, the X clock signal CLX, and the inverted X clock signal CLXinv. Assume that the basic operation of supplying the first or second image signal Vd1 or Vd2 line-sequentially to 6a is possible.

  The operation of the liquid crystal device in one field will be described below for the fourth embodiment. FIG. 15 is a schematic diagram for explaining supply of image signals to the pixel groups in the first subfield to the third subfield in the fourth embodiment, and FIG. FIG. 7 is a diagram having the same concept as in FIG. 6, schematically showing a state in which an image signal is written in a first subfield to a fourth subfield. FIG. 17 is a timing chart showing temporal changes of various signals for driving the pixel group in each subfield in the fourth embodiment.

  Hereinafter, in order to simplify the description, a case where the total number of data lines 6a is 8 and the total number of scanning lines 11a is 6 as shown in FIGS. 15 to 17 will be described.

  In the fourth embodiment, the plurality of pixel portions (see FIG. 2) in the image display area 10a have four pixels in two rows and two columns as a minimum and a display unit when a low-resolution image is displayed in the first subfield. Are divided into block units each including. Each field is divided into first to fourth subfields.

  In FIG. 15A, the upper part of FIG. 16, and FIG. 17, in the first subfield SF1, each of the pixel groups 90-21 to 90-23 arranged in three rows is based on two types of enable signals ENBy1 and ENBy2. , Two scanning lines 11a are selected simultaneously.

  On the other hand, the image signal generation circuit 502 generates the first image signals Vd11 to Vd14 for the rows of the pixel groups 90-21 to 90-23 in each row in the first subfield SF1.

  The data line driving circuit 101 synchronizes with the outputs of the scanning signals G1 to G6 for every two of the eight data lines 6a in the direction along the scanning line 11a. Supply sequentially.

  In FIG. 15A and FIG. 17, in the first subfield SF1, the pixel group 90 belonging to the pixel group 90-21 in the first row includes the first sub-field SF1 in the period in which the pixel group 90-21 in the first row is selected. One image signal Vd11 to Vd14 is sequentially supplied from the first to the fourth at the same time, every two data lines. In each pixel group 90, the first image signals Vd11 to Vd14 are written in the pixel portions belonging to the pixel group 90, respectively.

  Following the pixel group 90-21 in the first row, similarly to the first row, the pixel group 90-22 in the second row is simultaneously selected based on the scanning signals G3 and G4. , The first image signals Vd11 to Vd14 are sequentially supplied from the fifth to the eighth at the same time, two data lines at a time. Similarly to the first or second row, the pixel group 90-23 in the third row is simultaneously selected based on the scanning signals G5 and G6, and the first image signal Vd11 is sent to each pixel group 90 belonging thereto. To Vd14 are sequentially supplied to the ninth to the twelfth at the same time, two data lines at a time.

  Accordingly, in the first subfield SF1, in the image display area 10a, the unit of a block composed of pixels of 2 rows and 2 columns is set as the minimum display unit, and the corresponding low color of one of R, G, and B is selected. It becomes possible to display a resolution image.

  Subsequently, in the second subfield SF2, in FIG. 15B, FIG. 16 and FIG. 17, each of the three rows of pixel groups 90-21 to 90-23 is based on one of the two enable signals ENBy2. Thus, the second scanning line 11a is selected from the group of scanning lines 11a, and scanning signals G2, G4, and G6 are supplied.

  On the other hand, in the image signal generation circuit 502, in the second subfield SF2, the pixel groups 90-21 to 90-23 in each row are the first image signals to be supplied to the lower left pixels in the block of each pixel. Two image signals Vd21 to Vd24 are generated.

  The data line driving circuit 101 supplies the second image signals Vd21 to Vd24 line-sequentially to each of the eight data lines 6a in synchronization with the outputs of the scanning signals G2, G4, and G6.

  By performing a series of such vertical scans, an image with an improved resolution is displayed after the completion of the second subfield than after the completion of the first subfield.

  Subsequently, in the third subfield SF3, in each of the pixel groups 90-21 to 90-23 in the three rows in FIG. 15C, FIG. 16 and FIG. 17, one of the two types of enable signals ENBy2 is used. Thus, the first scanning line 11a is selected from the group of scanning lines 11a, and scanning signals G1, G3, and G5 are supplied.

  On the other hand, in the image signal generation circuit 502, in the third subfield SF3, for the pixel groups 90-21 to 90-23 in each row, the image signal to be supplied to the upper right pixel in the block of each pixel is Two image signals Vd21 to Vd24 are generated.

  The data line driving circuit 101 supplies the second image signals Vd21 to Vd24 line-sequentially to every other one of the eight data lines 6a in synchronization with the output of the scanning signals G1, G3, and G5. To do.

  By performing such a vertical scan in a row, an image with an improved resolution is displayed after the completion of the third subfield after the completion of the third subfield.

  Subsequently, in the fourth subfield SF2, in FIG. 16, for each of the three rows of pixel groups 90-21 to 90-23, based on one of the two types of enable signals ENBy2, The second scanning line 11a is selected, and scanning signals G2, G4, and G6 are supplied.

  On the other hand, in the image signal generation circuit 502, in the fourth subfield SF4, for the pixel groups 90-21 to 90-23 in each row, as the image signals to be originally supplied to the lower right pixels in the block of each pixel, Second image signals Vd21 to Vd24 are generated.

  The data line driving circuit 101 supplies the second image signals Vd21 to Vd24 line-sequentially to every other one of the eight data lines 6a in synchronization with the output of the scanning signals G2, G4, and G6. To do.

  By performing such a vertical scan, an image having the original resolution is displayed after the completion of the fourth subfield.

  As a result of the above, also in the fourth embodiment, the same benefits as those in the first to third embodiments described above can be obtained.

  Next, a modification of the present embodiment will be described with reference to FIG. FIG. 18 is a view having the same concept as FIG. 16 showing the driving method according to the present modification.

  In FIG. 18, in the first subfield SF1, a low-resolution image is written as in the case of the fourth embodiment shown in FIG.

  Subsequently, in the second subfield SF2, unlike the case of the fourth embodiment shown in FIG. 16, the scanning signal is supplied by two scanning lines in the same manner as in the first subfield and the image signal is supplied to the data line. Supply one by one and every other. As a result, when the second subfield SF2 is completed, a low-resolution image is obtained in which the original image signal is written for the upper two pixels for each block of pixels that is the minimum unit in display. In the case of the fourth embodiment, as can be seen from FIG. 16, for each block of pixels that is the minimum unit in display, a low-resolution image is obtained in which the original image signal is written for the two left pixels. It has been.

  Subsequently, in the third subfield SF3, unlike the fourth embodiment shown in FIG. 16, scanning signals are supplied to the scanning lines one by one and every other line, and image signals are supplied to the data lines. Supply one by one and every other. As a result, when the third subfield SF3 is completed, the original image signal is written in the three pixels other than the lower right pixel in each of the pixel blocks that are the minimum unit in the display. An image is obtained. Also in the case of the fourth embodiment, almost the same image is obtained as can be seen from FIG.

  Thereafter, in the fourth subfield SF4, an original low-resolution image is written in substantially the same manner as in the fourth embodiment.

  Thus, also in this modification, the substantially same profit as 4th Embodiment mentioned above can be acquired.

<Electro-optical device>
Next, the configuration of the electro-optical device to which the above-described embodiments are applied will be described with reference to FIGS. 19 and 20. FIG. 19 is a plan view showing the configuration of the liquid crystal device according to this embodiment, and FIG. 20 is a cross-sectional view taken along line HH ′ of FIG. In the following, as an example of the electro-optical device of the present invention, a TFT (Thin Film Transistor) active matrix driving type liquid crystal device with a built-in driving circuit is taken as an example.

  19 and 20, in the liquid crystal device according to the present embodiment, the TFT array substrate 10 and the counter substrate 20 are arranged to face each other. The TFT array substrate 10 is a transparent substrate such as a quartz substrate, a glass substrate, or a silicon substrate. The counter substrate 20 is also a transparent substrate, like the TFT array substrate 10. A liquid crystal layer 50 is sealed between the TFT array substrate 10 and the counter substrate 20. The TFT array substrate 10 and the counter substrate 20 are bonded to each other by a sealing material 52 provided in a sealing region located around the image display region 10a provided with a plurality of pixel electrodes.

  The sealing material 52 is made of, for example, an ultraviolet curable resin, a thermosetting resin, or the like for bonding the two substrates, and is applied on the TFT array substrate 10 in the manufacturing process and then cured by ultraviolet irradiation, heating, or the like. It is. In the sealing material 52, a gap material 56 such as glass fiber or glass bead for dispersing the distance between the TFT array substrate 10 and the counter substrate 20 (that is, the inter-substrate gap) to a predetermined value is dispersed.

  A light-shielding frame light-shielding film 53 that defines the frame area of the image display area 10a is provided on the counter substrate 20 side in parallel with the inside of the seal area where the sealing material 52 is disposed. However, part or all of the frame light shielding film 53 may be provided as a built-in light shielding film on the TFT array substrate 10 side.

  A data line driving circuit 101 and an external circuit connection terminal 102 are provided along one side of the TFT array substrate 10 in a region located outside the sealing region in which the sealing material 52 is disposed in the peripheral region. The scanning line driving circuit 104 is provided along two sides adjacent to the one side so as to be covered with the frame light shielding film 53. Further, in order to connect the two scanning line driving circuits 104 provided on both sides of the image display area 10 a in this way, a plurality of the pixel lines are covered along the remaining side of the TFT array substrate 10 and covered with the frame light shielding film 53. Wiring 105 is provided.

  On the TFT array substrate 10, vertical conduction terminals 106 for connecting the two substrates with a vertical conduction material are disposed in regions facing the four corner portions of the counter substrate 20. Thus, electrical conduction can be established between the TFT array substrate 10 and the counter substrate 20.

  In FIG. 20, an alignment film 16 is formed on the TFT array substrate 10 on the pixel electrode 9a after the formation of pixel switching TFTs, scanning lines, data lines, and the like. The pixel electrode 9a is made of a transparent conductive film such as an ITO (Indium Tin Oxide) film, and the alignment film 16 is made of an organic film such as a polyimide film. On the other hand, on the counter substrate 20, after forming a lattice-shaped or stripe-shaped light shielding film 23, a counter electrode 21 is provided over the entire surface, and further, an alignment film 22 is formed in the uppermost layer portion. ing. The counter electrode 21 is made of a transparent conductive film such as an ITO film, and the alignment film 22 is made of an organic film such as a polyimide film. A liquid crystal layer 50 is formed between the TFT array substrate 10 and the counter substrate 20 that are configured as described above and are arranged so that the pixel electrode 9a and the counter electrode 21 face each other. The liquid crystal layer 50 is made of, for example, a liquid crystal in which one or several types of nematic liquid crystals are mixed, and takes a predetermined alignment state between the pair of alignment films.

  In addition to the driving circuits such as the data line driving circuit 101 and the scanning line driving circuit 104, a plurality of data lines are precharged at a predetermined voltage level on the TFT array substrate 10 shown in FIGS. A precharge circuit for supplying a signal prior to an image signal, an inspection circuit for inspecting the quality, defects, etc. of the electro-optical device during manufacture or at the time of shipment may be formed.

<Electronic equipment>
Next, the case where the liquid crystal device which is the above-described electro-optical device is applied to various electronic devices will be described. FIG. 21 is a plan view schematically showing a configuration example of the projector. Hereinafter, a projector using the liquid crystal device as a light valve will be described.

  As shown in FIG. 21, the projector 1100 includes LEDs 110R, 110G, and 110B corresponding to the three primary colors RGB. The LEDs 110R, 110G, and 110B sequentially project light, for example, at a period of 60 Hz. The projection lights emitted from the LEDs 110R, 110G, and 110B are incident on the synthesis prism 1300 and then emitted to the liquid crystal panel 1200 as a light valve.

  The configuration of the liquid crystal panel 1200 is the same as that of the liquid crystal device described above, and is driven by signals supplied from the controller. Then, the light modulated by the liquid crystal panel 1200 is projected through the projection lens 1400. As a result, a color image is projected onto a screen or the like.

  In the projector 1100 according to the present embodiment, the LEDs 110R, 110G, and 110B corresponding to the primary colors of R, G, and B are provided, so that it is not necessary to provide a color filter. Therefore, the cost can be reduced, and since the projection light does not pass through the color filter, high luminance can be obtained. Further, since there is no need to provide a color filter, pixels can be miniaturized and high-definition image display can be performed.

  In addition to the electronic device described with reference to FIG. 21, a mobile personal computer, a mobile phone, a liquid crystal television, a viewfinder type, a monitor direct view type video tape recorder, a car navigation device, a pager, an electronic device Examples include a notebook, a calculator, a word processor, a workstation, a videophone, a POS terminal, and a device equipped with a touch panel. Needless to say, the present invention can be applied to these various electronic devices.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit or concept of the invention that can be read from the claims and the entire specification, and driving of a display device accompanied by such a change. A method and a drive circuit, an electro-optical device, and an electronic apparatus are also included in the technical scope of the present invention.

It is a block diagram which shows the whole structure of a liquid crystal device. It is a block diagram which shows the electrical structure of a liquid crystal panel. It is a schematic diagram for demonstrating typically the drive method of the liquid crystal device which concerns on this embodiment. It is a circuit diagram which shows an example of a structure of a data line drive circuit. It is a schematic diagram for demonstrating supply of the image signal with respect to each pixel group in 1 field. FIG. 3 is a series of plan views schematically showing how image signals are written in the first and second subfields in the image display area in the first embodiment. It is a timing chart which shows a time-dependent change of the various signals for driving the pixel group in 1 field. FIG. 7 is a series of plan views having the same concept as in FIG. 6, schematically showing one driving method in a case where the minimum unit in display is three pixels along a scanning line, according to a modification of the first embodiment. . FIG. 7 is a series of plan views having the same concept as in FIG. 6 schematically showing another driving method in the case where the minimum unit in display is three pixels along the scanning line according to another modification of the first embodiment. . It is a schematic diagram for demonstrating supply of the image signal with respect to each pixel group in a 1st subfield in 2nd Embodiment. It is a schematic diagram for demonstrating supply of the image signal with respect to each pixel group after the 2nd subfield in 2nd Embodiment. It is a schematic diagram for demonstrating supply of the image signal with respect to each pixel group in 1 field about 3rd Embodiment. 12 is a timing chart showing changes with time of various signals for driving a pixel group in one field in the third embodiment. It is a figure which shows an example of a structure of a scanning line drive circuit. It is a schematic diagram for demonstrating supply of the image signal with respect to each pixel group in 1 field about 4th Embodiment. FIG. 7 is a series of plan views having the same concept as in FIG. 6 schematically showing a state in which an image signal is written in each subfield in an image display area in the fourth embodiment. It is a timing chart which shows a time-dependent change of various signals for driving a pixel group in one field about a 4th embodiment. FIG. 17 is a series of plan views having the same concept as in FIG. 16, schematically showing a driving method according to the present modification of the fourth embodiment. It is a top view which shows the structure of a liquid crystal device. It is the HH 'sectional view taken on the line of FIG. It is a top view which shows the structure of the projector which is an example of the electronic device to which the electro-optical apparatus is applied.

Explanation of symbols

  6a ... data line, 11a ... scanning line, 90 ... pixel group, 100 ... liquid crystal panel, 101 ... data line driving circuit, 104 ... scanning line driving circuit, 200 ... light source, 502 ... image signal supply circuit, 506 ... light source control circuit

Claims (12)

A plurality of scanning lines and data lines intersecting each other, a plurality of pixel portions formed corresponding to the intersections of the scanning lines and data lines, and light corresponding to a plurality of unit colors are supplied to the pixel portions in a time division manner. A display device driving method for driving a display device including a possible light source,
A frame period corresponding to a frame image is divided into field periods for each unit color corresponding to the field image for each unit color constituting the frame image, and the field period is further divided into first to nth ( Where n is a natural number greater than or equal to 2) subfield periods,
In the first subfield period, a first subfield image having a first resolution that is at least inferior in resolution in the first direction along the scanning line as compared with the original resolution of the field image. A first step of supplying a scanning signal to the scanning line and supplying the image signal to the data line so as to write to the plurality of pixel portions while writing with the image signal to be originally written on a part of
In the second subfield period, the resolution in at least one of the first direction and the second direction along the data line is superior to the first resolution and is lower than the original resolution. The scanning line is scanned to write the other part of the second sub-field image of the resolution excluding the part to the plurality of pixel portions while writing the other part with the image signal to be originally written. And a second step of supplying the image signal to the data line while supplying a signal. In the L-th (where L is a natural number of 3 or more) sub-field period, the resolution in the at least one direction is superior to the second resolution and the L-th sub-th L resolution is less than the original resolution compared to the second resolution. The scanning line is written in the field image so as to write another part of the field image except the part and the other part to the plurality of pixel parts while writing the other part with the image signal to be originally written. And further including a subsequent step of supplying the scanning signal and the image signal to the data line,
The subsequent process is repeatedly performed for each field period until the L-th subfield image is written with the image signal to be originally supplied to all of the plurality of pixel units. A driving method of the display device according to the above.   3. The display device driving method according to claim 1, wherein in the second step, only the other portion is written in the second subfield period. 4. In the first step, m (where m is a natural number of 2 or more) data lines among the data lines in synchronization with supplying the scanning signal to the scanning lines in the first subfield period. The image signals corresponding to the i-th (where i is a natural number less than or equal to m) data line included in the group consisting of:
In the second step, the jth included in the group is synchronized with the supply of the scanning signal to the scanning line in the second subfield period (where j is a natural number less than m different from i). The method of driving a display device according to claim 3, wherein the image signal corresponding to the data line is supplied to the j-th data line for each group.   In the second step, in the second subfield period, the remaining portion excluding the portion and the other portion in the second subfield image is written with the image signal that should be originally written for the other portion. The method for driving a display device according to claim 1 or 2. In the first step, m (where m is a natural number of 2 or more) data lines among the data lines in synchronization with supplying the scanning signal to the scanning lines in the first subfield period. The image signals corresponding to the i-th (where i is a natural number less than or equal to m) data line included in the group consisting of:
In the second step, the jth included in the group is synchronized with the supply of the scanning signal to the scanning line in the second subfield period (where j is a natural number less than m different from i). 6. The display according to claim 5, wherein the image signals corresponding to the data lines are supplied together for each remaining group excluding the i-th data line from the group and including the j-th data line. Device driving method. The first step is a block unit image in which the image signal is written as the first subfield image for each block unit in which the resolution is inferior in both the first direction and the second direction compared to the original resolution. And supplying the scanning signal to the scanning line and the image signal to the data line so as to write to the plurality of pixel portions,
In the second step, the scanning signal is supplied to the scanning line and the image signal is supplied to the data line so that the other part is written in the plurality of pixel units for each block unit. The method for driving a display device according to claim 1.   8. The display according to claim 1, wherein in each of the first to n-th subfield periods, a scanning speed related to line scanning in a direction along the data line is constant. Device driving method. In the first subfield period, the light is not supplied by the light source,
The driving method according to any one of claims 1 to 8, wherein the light is supplied from the light source after the second subfield period. A plurality of scanning lines and data lines intersecting each other, a plurality of pixel portions formed corresponding to the intersections of the scanning lines and data lines, and light corresponding to a plurality of unit colors are supplied to the pixel portions in a time division manner. A display device drive circuit for driving a display device comprising a possible light source,
A frame period corresponding to a frame image is divided into field periods for each unit color corresponding to the field image for each unit color constituting the frame image, and the field period is further divided into first to nth ( Where n is a natural number greater than or equal to 2) subfield periods,
In the first subfield period, a first subfield image having a first resolution that is at least inferior in resolution in the first direction along the scanning line as compared with the original resolution of the field image. A first driving means for supplying a scanning signal to the scanning line and supplying the image signal to the data line so as to write to the plurality of pixel portions while writing with the image signal to be originally written on a part of
In the second subfield period, the resolution in at least one of the first direction and the second direction along the data line is superior to the first resolution and is lower than the original resolution. The scanning line is scanned to write the other part of the second sub-field image of the resolution excluding the part to the plurality of pixel portions while writing the other part with the image signal to be originally written. A drive circuit for a display device, comprising: second drive means for supplying a signal and supplying the image signal to the data line. A drive circuit for a display device according to claim 10,
The scanning lines and data lines;
The pixel portion;
An electro-optical device comprising: the light source.   An electronic apparatus comprising the electro-optical device according to claim 11.

Images