JP2005345878A - Drive circuit and method of electrooptic device, electrooptic device, and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To disply a high-quality image by reducing a sense of afterimage in an electrooptic device. <P>SOLUTION: This drive circuit has a scanning line drive circuit to supply scanning signals alternately to the small areas obtained by dividing the image display area and also sequentially to the scanning lines in these small areas, and an image signal supply circuit to supply image signals and black signals to the two pairs of the small areas out of those small areas, in a way supplying image signals to the pixels of one pair to display images through the sampling supply switch and the data line, and supplying black signals in the polarity different from the image signals to the pixels in the other pair to display black images through the black signal supply switch and the data line within one vertical scanning period, and further, supplying those image signals and black signals by interchanging two small areas with each other in a predetermined cycle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a driving circuit and a driving method for driving an electro-optical device including an electro-optical panel such as a liquid crystal panel, an electro-optical device such as a liquid crystal device including the driving circuit, and such an electro-optical device. The present invention relates to a technical field of electronic equipment such as a liquid crystal projector.

  As an example of an electro-optical device driven by this type of driving circuit, Patent Documents 1 to 3 correspond to data lines and scanning lines wired vertically and horizontally in the image display area on the substrate, and their intersections. A liquid crystal device having a liquid crystal panel including a pixel portion formed in this manner is disclosed.

  In this liquid crystal panel, a scanning signal output from the driving circuit is supplied to each pixel portion via a scanning line, and an image signal inverted to the first polarity or the second polarity from the driving circuit via a data line. Supplied. For example, the driving circuit supplies a scanning signal to each scanning line in a line sequential manner and supplies an image signal to each data line. Further, the drive circuit performs polarity inversion of the image signal by dot inversion in which the signal polarity is different between adjacent dots or line inversion in which the signal polarity is different between adjacent rows.

  Furthermore, the inventors of the present application have found a unique driving method for displaying an image by scanning a plurality of partial areas obtained by dividing the image display area by dividing lines along the scanning lines as follows. Has been. That is, according to this driving method, a scanning signal is sequentially supplied to each scanning line by the driving circuit so that the scanning lines are selected in a predetermined cycle in each partial region. In addition, driving is performed so that the pixel portion formed in one of the adjacent partial regions and the pixel portion formed in the other are driven based on image signals having different polarities in a cycle in which the scanning lines are selected. An image signal is supplied to each data line by the circuit. According to such a driving method, in one field period, an image signal for displaying one screen on each pixel portion is written twice with the polarity changed.

  In addition, according to Patent Document 1, when an image is displayed on a liquid crystal panel having a larger number of scanning lines than the number of scanning lines of a video source, high-speed scanning that is twice the normal operation of the display period is performed in the blanking period by the drive circuit. Is done. According to Patent Document 2, the drive circuit controls the input / output characteristics of the image signal according to the type of the liquid crystal panel. Further, according to Patent Document 3, the drive circuit supplies a precharge signal to each data line in a lump before supplying an image signal within a horizontal scanning period. At this time, in order to reduce luminance unevenness and color unevenness in the display image displayed on the liquid crystal panel, a precharge signal is generated as a signal whose precharge potential changes continuously or stepwise with time.

Japanese Patent Laid-Open No. 9-269553 JP 2002-221940 A JP-A-11-337910

  As described above, the image signal written in each pixel portion is held for a certain period in the liquid crystal element and the storage capacitor added in parallel to the liquid crystal element. When each pixel unit is driven in this manner and a moving image is displayed in the image display area, there is a possibility that an afterimage is visually recognized in the obtained display image, that is, an image display that gives a feeling of afterimage may be performed. And such a feeling of afterimage causes a problem that the quality of the display image on the liquid crystal panel is deteriorated.

  The present invention has been made in view of the above problems, and a drive circuit and a drive method capable of displaying a high-quality image by reducing afterimage in an electro-optical device, and such a drive circuit. It is an object of the present invention to provide an electro-optical device provided and various electronic apparatuses including the electro-optical device.

  In order to solve the above problems, the drive circuit of the electro-optical device of the present invention is electrically connected to the data display area on the substrate, the plurality of data lines and the plurality of scanning lines, and the data line and the scanning lines, respectively. And a driving circuit for driving an electro-optical device including an electro-optical panel including a plurality of pixel units each including a display element, wherein the image display area is divided by dividing lines along the scanning lines. A plurality of partial regions obtained in this manner, a scanning line driving circuit for supplying a scanning signal alternately to the plurality of partial regions and sequentially for the plurality of scanning lines in each partial region; and A plurality of terminals connected to one end side, each having one of a first polarity and a second polarity with respect to a reference potential, and each supplying an image signal for displaying a display image in the image display area to the data line A solid-state signal for displaying a solid image of a specific color in the image display area while having a polarity different from that of the image signal and connected to the other end side of the sampling switch and the data line, and the image signal is the data A plurality of solid signal supply switches respectively supplied to the data line in a period different from the period supplied to the line, and two partial areas forming a pair of the plurality of partial areas, one in each partial area After the scanning signal is supplied to the scanning line, until the scanning signal is supplied to the one scanning line again, the image signal is sampled to the pixel portion in one of the two partial regions. The solid signal is supplied via the switch and the data line, and the solid signal is supplied to the pixel portion in the other of the two partial regions. It delivered over, further, as the one and the other of the two partial areas are interchanged in a predetermined period, and an image signal supply circuit for supplying the image signal and the solid signal.

  In the electro-optical device driven by the driving circuit of the present invention, each pixel portion in the electro-optical panel includes a display element such as a liquid crystal element. For example, a thin film transistor (drive element for driving the display element) A pixel switching element such as a thin film transistor (hereinafter referred to as “TFT”) is provided. Each scanning line is arranged and wired along, for example, one direction in the image display area on the substrate.

  According to the driving circuit of the present invention, when driving the electro-optical device, the plurality of partial areas obtained by dividing the image display area of the electro-optical panel are the areas as described below for each pixel area in each partial area. Scan. At this time, each of the plurality of partial regions is either a display region in which each pixel unit is driven based on an image signal or a display region of a specific color solid image in which each pixel unit is driven based on a solid signal, and Each pixel unit is driven with a pair of two partial areas that are a display area and a solid image display area. Here, the “solid image of a specific color” here means, for example, a black solid screen displayed in the image display area. In this case, the screen displayed in the image display area is black and is entirely filled.

  The above-described area scanning will be specifically described below. A scanning signal is alternately supplied from the scanning line driving circuit to each partial area from the scanning line driving circuit. In each partial area, for example, from the top to the bottom of the partial area along the arrangement direction of the scanning lines. Then, a scanning signal is sequentially supplied to each scanning line.

  A sampling switch is provided at one end of each data line, and a black signal supply switch, for example, is provided as a solid signal supply switch at the other end of each data line. Then, for two partial areas that form a pair among a plurality of partial areas, after a scanning signal is supplied to one scanning line in each partial area, the scanning signal is supplied again to the one scanning line. During this period, the image signal having one of the first and second polarities output from the image signal supply circuit is sampled on a plurality of data lines within the scanning signal supply period of each scanning line in one partial region. Supplied via a switch. Note that “one scanning line” in “from when a scanning signal is supplied to one scanning line in each partial region until the scanning signal is supplied again to the one scanning line” is roughly Each partial area corresponds to the first scanning line to which the first scanning signal of the partial area is supplied.

  After the scanning signal is supplied to one scanning line in each partial area, until the scanning signal is supplied again to the one scanning line, within the scanning signal supply period of each scanning line in the other partial area In addition, as a solid signal having a polarity different from that of the image signal, for example, a black signal for displaying a black image which is a black solid image as described above as a solid image of a specific color in the image display region is supplied from the image signal supply circuit. The data is output and supplied to the plurality of data lines via the black signal supply switch. It should be noted that the period during which the scanning signal is supplied to each scanning line in the other partial area and the period during which the scanning signal is supplied to each scanning line in one partial area are at different positions on the time axis.

  Here, the pixel portion corresponding to the scanning line selected in one partial region is in a selected state by supplying a scanning signal from the scanning line. For example, the pixel portion is selected by supplying a scanning signal from the selected scanning line and turning on the pixel switching element. In the pixel portion thus selected, an image signal is supplied to the display element from the corresponding data line. The display element displays an image based on the image signal.

  In the other partial region, the pixel portion corresponding to the selected scanning line is selected in the same manner as the pixel portion in the one partial region, and a black signal is supplied from the corresponding data line. The display element displays a black image based on the black signal.

  As described above, in one partial region, the image signal written in the pixel portion corresponding to each scanning line is supplied to the scanning line after the scanning signal is supplied to the scanning line. Until each pixel portion is held. In the other partial region, the black signal written to the pixel portion corresponding to each scanning line is supplied until the selection signal is supplied to the scanning line after the scanning signal is supplied to the scanning line. Is held in each pixel portion.

  In addition, prior to image display based on an image signal in which a pixel portion corresponding to one scanning line in one partial region is written, a pixel portion corresponding to one scanning line is written in the other partial region. A black image is displayed based on the black signal. Alternatively, after displaying an image based on an image signal in which a pixel portion corresponding to one scanning line in one partial region is written, a pixel portion corresponding to one scanning line is written in the other partial region. A black image is displayed based on the black signal. Then, after the supply of scanning signals to all scanning lines in one partial region is completed, the supply of scanning signals to all scanning lines in the other partial region is completed. Alternatively, after the supply of the scanning signal to all the scanning lines in the other partial region is finished, the supply of the scanning signal to all the scanning lines in the one partial region is finished. Further, when the supply of scanning signals to all the scanning lines in one partial region is finished, the writing of image signals to each pixel unit is also finished, and when the supply of scanning signals to all the scanning lines in the other partial region is finished, Writing of the black signal to each pixel unit is also completed.

  Here, the image signal supply circuit is configured to drive the pixel unit based on the black signal and the partial region where the pixel unit is driven based on the image signal in two cycles of the paired partial regions. An image signal and a black signal are supplied so that the partial areas are alternately switched. Therefore, as described above, after the writing of the image signal to each pixel portion is completed in one partial region, the black signal is written to each of these pixel portions. Further, as described above, after the writing of the black signal to each pixel portion is completed in the other partial region, the image signal is written to each of these pixel portions.

  Then, an image signal is written to each pixel portion in each of the plurality of partial areas, whereby a display image is displayed in the image display area. Similarly, a black image is displayed by writing a black signal to each pixel portion in each of the plurality of partial areas.

  Therefore, for example, when a moving image is displayed in the image display area, when the obtained display image is observed with human eyes, the image display is performed in one partial area, and then the black image is displayed in the other partial area. The display screen appears to have been reset. Therefore, in the electro-optical device driven by the drive circuit of the present invention, it is possible to reduce a feeling of afterimage in the display image, so that high-quality image display can be performed.

  If the image is displayed in one partial area while displaying the black in the other partial area in this way, the screen brightness is reduced to about half compared to the case where the image is displayed in the entire area as usual. Become. For this reason, an adjustment for increasing the luminance of the image signal, for example, an adjustment for doubling the luminance related to the image signal may be performed.

  In addition, if the image display is performed in one partial area while displaying the black in the other partial area without changing the field frequency of the image signal supplied to the data line, the image is displayed at the normal field frequency. Compared with the case of performing the above, the field frequency for the image signal supplied to each pixel unit is about half. That is, half of the field image is lost due to black display. For this reason, an adjustment for increasing the field frequency, for example, an adjustment for supplying the image signal to the image signal supply circuit via the buffer at a doubled field frequency may be performed. That is, for example, “double speed driving” may be performed. By driving at double speed in this way, an image signal is supplied to each pixel unit in place of the black signal, so that on the display image, particularly in the case of a moving image, the same level as that displayed at the original frame frequency. Smoothness will be obtained.

  Here, the image signal and the black signal have different polarities. Therefore, if the image signal and the black signal are supplied to each data line via the same switch, the switching response time from the image signal to the black signal or the black signal to the image signal in the switch may be increased. There is. However, in the driving circuit according to the present invention, the black signal is supplied to each data line via a black signal supply switch that is different from the sampling switch for supplying the image signal. Therefore, in the driving circuit of the present invention, the switching response time described above can be eliminated, and the writing time of the image signal and the black signal for each data line can be shortened.

  In one aspect of the drive circuit of the electro-optical device according to the aspect of the invention, the image signal supply circuit supplies a black signal for displaying a black image as the solid image as the solid signal.

  According to this aspect, after the scanning signal is supplied to one scanning line in each of the two partial regions that form a pair, the scanning signal is supplied again to the one scanning line. In addition, it is possible to perform image display in one partial area while performing black display in the other partial area. Then, by writing an image signal to each pixel unit in each of the plurality of partial areas, a display image is displayed in the image display area, and by writing a black signal to each pixel unit in each of the plurality of partial areas, A black image is displayed.

  In another aspect of the drive circuit of the electro-optical device according to the aspect of the invention, the image signal supply circuit may supply the scan signal to the one scan line with the predetermined period of one and the other of the two partial regions. The image signal and the solid signal are supplied so as to be switched at a cycle that is performed.

  According to this aspect, when, for example, a still image (for example, a field image or a frame image) is displayed as one display image or a black image is displayed as one solid image in the image display region, each scan is performed in each partial region. The scanning signal is supplied to the line as many times as the number of the plurality of partial regions. Therefore, in order to make the time required for displaying one display image and a black image equal to the normal operation, that is, the case where the above-described area scanning is not performed, the scanning line driving circuit and the image signal supply circuit are arranged in a plurality of partial areas. What is necessary is just to drive double speed according to the number.

  Here, for example, an image signal and a black signal as a solid signal are alternately output from the image signal supply circuit. In this case, the polarity of the signal supplied from the image signal supply circuit is inverted every scanning signal supply period. Therefore, when the above-described double speed driving is performed and the image display area is divided into two partial areas, for example, in the electro-optical panel, for example, compared with the case where each pixel portion in the image display area is horizontally scanned line-sequentially. Thus, the frequency of polarity inversion of the output signal of the image signal supply circuit can be doubled. When attention is paid to one pixel portion formed in one of the two partial regions, black signals and image signals having different polarities are supplied to the pixel portion in a cycle in which the scanning signal is supplied to the corresponding scanning line. It is written via the data line. Then, the voltage held in the display element is changed by the written black signal and image signal, and thus flicker may occur in image display in each pixel portion.

  In this aspect, as described above, the frequency of the polarity inversion of the output signal of the image signal supply circuit changes in accordance with the number of the plurality of partial areas, thereby suppressing the occurrence of flicker due to the polarity inversion as being difficult to visually recognize. It becomes possible to do. As a result, higher quality image display can be performed in the electro-optical device.

  In another aspect of the drive circuit of the electro-optical device according to the aspect of the invention, the plurality of partial regions may be obtained by dividing the plurality of partial regions by the dividing lines so that the areas viewed in plan are substantially equal to each other. The scanning line driving circuit supplies the scanning signal alternately to the two partial regions and line-sequentially to the plurality of scanning lines in each partial region, and in the one partial region The one scanning line in the other partial area is located halfway ahead of the image display area along the data line with respect to the one scanning line.

  In this aspect, prior to the image display performed based on the image signal in which the pixel portion corresponding to one scanning line in one of the two partial areas obtained by equally dividing the image display area is written. Alternatively, the pixel portion corresponding to one scanning line in the other partial area performs black image display based on a black signal that is a written solid signal, for example. Accordingly, for example, when a moving image is displayed in the image display area, it is possible to more effectively reduce the afterimage feeling in the obtained display image. Therefore, a high quality image with reduced flicker can be displayed uniformly over the entire display image.

  In another aspect of the drive circuit of the electro-optical device according to the aspect of the invention, the sampling switch supplies the image signal according to a first selection signal that defines an image signal supply period, and the solid signal supply switch includes: The solid signal is supplied in response to a second selection signal that defines a solid signal supply period, and the scan signal is supplied to the scan line in one of the two partial regions within the scan signal supply period. One selection signal is sequentially supplied to the plurality of sampling switches, and the second selection signal is supplied within the scanning signal supply period in which the scanning signal is supplied to the scanning line in the other of the two partial regions. It further includes a selection signal supply circuit that supplies the plurality of solid signal supply switches collectively.

  In this aspect, an image signal is supplied to each data line via the sampling switch during the image signal supply period within the scanning signal supply period of each scanning line in one of the two partial regions forming a pair. In this case, the first selection signal is sequentially supplied to the plurality of sampling switches one or more at a time, so that the image signal is sequentially supplied to one or a plurality of data lines among the plurality of data lines. Is preferred.

  Further, during the solid signal supply period within the scanning signal supply period of each scanning line in the other of the two partial regions forming a pair, the solid signal is supplied to each data line together via the solid signal supply switch. For this reason, the solid signal supply period can be made shorter than the image signal supply period.

  In the aspect in which the first selection signal is supplied to the sampling switch and the second selection signal is supplied to the solid signal supply switch, the image signal supply circuit outputs the solid signal during the horizontal blanking period of the image signal. The selection signal supply circuit may supply the second selection signal during the horizontal blanking period.

  With this configuration, the solid signal in the scanning signal supply period of each scanning line in the other is compared to the image signal supply period in the scanning signal supply period of each scanning line in one of the two partial regions forming a pair. The horizontal blanking period, which is the supply period, can be set to a relatively short time. In this aspect, in the other partial region, a solid signal is written to the pixel portion corresponding to the selected scanning line via the data line in the horizontal blanking period.

  In the aspect in which the selection signal supply circuit supplies the second selection signal during the horizontal blanking period, the scanning line driving circuit includes the scanning signal supply period of the scanning line in the one partial region and the second partial region. The scanning signal supply period of the scanning line is adjacent to each other on the time axis, and the length of the scanning signal supply period of the scanning line in the one partial region is the first length corresponding to the image signal supply period. And the scanning signal supply period of the scanning line in the other partial region is a second length shorter than the first length corresponding to the horizontal blanking period. You may comprise so that it may supply.

  According to this configuration, for the two partial regions to be paired, the image signal is written to the pixel portion corresponding to one scanning line in one partial region and alternately corresponds to one scanning line in the other partial region. A solid signal can be written to the pixel portion. Of the two partial areas that are paired, in the partial area in which each pixel unit is driven based on the image signal, it is possible to sufficiently increase the writing time of the image signal to each pixel unit. That is, it is possible to display the image signal and the solid signal alternately without increasing the driving frequency too much. Therefore, it is very advantageous in practice from the viewpoint that it is not necessary to increase the writing capability of the image signal for the data line, the image signal supply circuit, and the like.

  In the aspect in which the first selection signal is supplied to the sampling switch and the second selection signal is supplied to the solid signal supply switch, the selection signal supply circuit further scans the scanning line in the one partial region. Within the signal supply period, prior to the supply of the first selection signal, a third selection signal defining a precharge period is collectively supplied to the plurality of sampling switches, and the image signal supply circuit includes at least the image signal supply circuit A precharge signal may be supplied to the plurality of sampling switches during a precharge period, and each of the plurality of sampling switches may supply the precharge signal to the data line in response to the third selection signal. Good.

  With this configuration, the video precoding is performed as follows during the precharge period preceding the image signal supply period within the scan signal supply period of each scanning line in one of the two partial areas forming a pair. Charging is performed. In other words, the precharge signals supplied from the image signal supply circuit during the precharge period within the scan signal supply period of each scan line in one partial region are combined into a plurality of data lines via a plurality of sampling switches. Supplied.

  Accordingly, when video precharge is performed in this way, each sampling switch supplies a precharge signal and an image signal. Since the plurality of data lines are precharged to a voltage corresponding to the precharge signal during the precharge period, it is possible to write the image signal to each data line in a relatively short time during the image signal supply period. It becomes.

  The aspect in which the first selection signal is supplied to the sampling switch and the second selection signal is supplied to the black signal supply switch further includes a precharge signal supply circuit that supplies a precharge signal at least during the precharge period. The plurality of solid signal supply switches are each provided as a precharge switch, and supply the precharge signal to the data line according to a third selection signal defining the precharge period, and supply the selection signal. The circuit further supplies the third selection signal to the plurality of solid signal supply switches within the scanning signal supply period of the scanning line in the one partial region and prior to the supply of the first selection signal. You may comprise so that it may supply collectively.

  With this configuration, the normal signal is supplied as follows during the precharge period preceding the image signal supply period within the scanning signal supply period of each scanning line in one of the two partial areas forming a pair. Precharge is performed. That is, the precharge signal supplied from the precharge signal supply circuit during the precharge period within the scan signal supply period of each scan line in one partial region is sent to a plurality of data via a plurality of solid signal supply switches. Supplied together in a line. Therefore, when performing normal precharge in this way, each black signal supply switch supplies a precharge signal and a black signal. Since the plurality of data lines are precharged to a voltage corresponding to the precharge signal during the precharge period, it is possible to write the image signal to each data line in a relatively short time during the image signal supply period. It becomes.

  In order to solve the above-described problems, an electro-optical device of the present invention includes the above-described drive circuit (including various aspects thereof) of the electro-optical device of the present invention.

  According to the electro-optical device of the present invention, high-quality image display can be performed by driving the electro-optical device with the drive circuit of the present invention as described above.

  In one aspect of the electro-optical device according to the aspect of the invention, the pixel unit includes a pixel switching element that controls switching of the display element. The display element is provided to face the pixel electrode and the pixel electrode, and has a common potential. The pixel switching element includes the image signal and the solid signal supplied from the data line in response to the scan signal supplied from the scan line. Is supplied to the pixel electrode, and the display element displays an image based on the image signal and the solid signal.

  According to this aspect, the display element in each pixel unit is switching-controlled by the pixel switching element. More specifically, the pixel switching element supplies the image signal and the solid signal supplied to the corresponding data line to the pixel electrode of the display element in accordance with the scanning signal supplied from the corresponding scanning line. As a result, each pixel portion can be driven in an active matrix.

  In each pixel portion, the display element includes an electro-optical material such as liquid crystal sandwiched between the pixel electrode and the counter electrode. Then, a voltage defined by the potential of each of the pixel electrode and the counter electrode is applied to the electro-optical material, whereby image display is performed by the display element. Here, in each pixel portion, the counter electrode of the display element is maintained at a common predetermined potential. Then, by supplying a solid signal and an image signal having different polarities to the pixel electrode, the display element can be AC driven.

  In order to solve the above problems, an electronic apparatus according to the present invention includes the above-described electro-optical device according to the present invention (including various aspects thereof).

  Since the electronic apparatus of the present invention includes the above-described electro-optical device of the present invention, a projection display device, a television, a mobile phone, an electronic notebook, a word processor, a view capable of performing high-quality image display. Various electronic devices such as a finder type or a monitor direct-view type video tape recorder, a workstation, a videophone, a POS terminal, and a touch panel can be realized. In addition, as an electronic apparatus of the present invention, for example, an electrophoretic device such as electronic paper, an electron emission device (Field Emission Display and a Conduction Electron-Emitter Display), an electrophoretic device, and an apparatus using the electron emission device, DLP (Degital Light Processing) and the like can also be realized.

  In order to solve the above-described problem, the electro-optical device driving method of the present invention electrically connects a plurality of data lines and a plurality of scanning lines to the image display area on the substrate, and the data lines and the scanning lines, respectively. A driving method for driving an electro-optical device including an electro-optical panel including a plurality of pixel units each including a display element, wherein the image display area is divided by dividing lines along the scanning lines. A first step of supplying a scanning signal alternately to the plurality of partial regions and sequentially to the plurality of scanning lines in each partial region, and one end of the data line The plurality of image signals for displaying a display image in the image display area while having one of the first and second polarities with respect to a reference potential via a sampling switch connected to the side A solid signal having a polarity different from that of the image signal and having a specific color in the image display area through a second step of supplying the data line to the data line and a solid signal supply switch connected to the other end of the data line. A third step of supplying a solid signal for displaying an image to each of the plurality of data lines in a period different from a period in which the image signal is supplied to the data line; For the two partial areas constituting the two partial areas, after the scanning signal is supplied to one scanning line in each partial area, until the scanning signal is supplied again to the one scanning line, the two parts The image signal is supplied to the pixel portion in one of the regions via the sampling switch and the data line, and the solid signal is supplied to the pixel portion in the other of the two partial regions. Pitch and supplied through the data lines, further, as the one and the other of the two partial areas are interchanged in a predetermined period, comprising a fourth step of supplying the image signal and the solid signal.

  According to the driving method of the electro-optical device of the present invention, it is possible to perform high-quality image display in the electro-optical device by reducing the afterimage feeling in the display image, similarly to the driving circuit of the present invention described above. It becomes. In addition, it is possible to eliminate the switching response time from the image signal to the solid signal or the solid signal to the image signal, which occurs when the image signal and the solid signal are supplied to each data line via the same switch. The writing time of the image signal and the solid signal for each data line can be shortened.

  Such an operation and other advantages of the present invention will become apparent from the embodiments described below.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the electro-optical device of the invention is applied to a liquid crystal device.

<1: First Embodiment>
First, a first embodiment according to the electro-optical device of the invention will be described with reference to FIGS.

<1-1: Overall configuration of electro-optical panel>
An overall configuration of a liquid crystal panel as an example of an electro-optical panel in a liquid crystal device as an electro-optical device of the present invention will be described with reference to FIGS. Here, FIG. 1 is a schematic plan view of a liquid crystal panel when the TFT array substrate is viewed from the side of the counter substrate together with each component formed thereon, and FIG. 2 is a schematic diagram of HH ′ of FIG. It is sectional drawing. Here, a TFT active matrix driving type liquid crystal device with a built-in driving circuit is taken as an example.

  1 and 2, in the liquid crystal panel 100 according to the present embodiment, the TFT array substrate 10 and the counter substrate 20 are arranged to face each other. A liquid crystal layer 50 is sealed between the TFT array substrate 10 and the counter substrate 20, and the TFT array substrate 10 and the counter substrate 20 are provided with a sealing material 52 provided in a seal region positioned around the image display region 10a. Are bonded to each other.

  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. Further, in the sealing material 52, a gap material such as glass fiber or glass beads for dispersing the distance (inter-substrate gap) between the TFT array substrate 10 and the counter substrate 20 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.

  Of the peripheral regions located around the image display region 10 a, the data line driving circuit 101 and the external circuit connection terminal 102 are arranged on one side of the TFT array substrate 10 in the region located outside the seal region where the sealing material 52 is disposed. It is provided along. The scanning line driving circuit 104 is provided along one of the two sides adjacent to the one side so as to be covered with the frame light shielding film 53. The scanning line driving circuit 104 may be provided along two sides adjacent to one side of the TFT array substrate 10 provided with the data line driving circuit 101 and the external circuit connection terminal 102. In this case, the two scanning line driving circuits 104 are connected to each other by a plurality of wirings provided along the remaining one side of the TFT array substrate 10.

  In addition, vertical conduction members 106 that function as vertical conduction terminals between the two substrates are disposed at the four corners of the counter substrate 20. On the other hand, the TFT array substrate 10 is provided with vertical conduction terminals in a region facing these corner portions. Thus, electrical conduction can be established between the TFT array substrate 10 and the counter substrate 20.

  In FIG. 2, on the TFT array substrate 10, an alignment film is formed on the pixel electrode 9a after the pixel switching TFT, the scanning line, the data line and the like are formed. On the other hand, on the counter substrate 20, in addition to the counter electrode 21, a lattice-shaped or striped light-shielding film 23 and an alignment film are formed on the uppermost layer portion. Further, 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.

  Although not shown in FIGS. 1 and 2, a black signal supply circuit (to be described later) is formed on the TFT array substrate 10 in addition to the data line driving circuit 101 and the scanning line driving circuit 104. May form an inspection circuit or the like for inspecting the quality, defects, etc. of the electro-optical device during manufacture or at the time of shipment.

<1-2: Overall configuration of electro-optical device>
The overall configuration of the liquid crystal device will be described with reference to FIGS. FIG. 3 is a block diagram showing the overall configuration of the liquid crystal device, and FIG. 4 is a block diagram showing the electrical configuration of the liquid crystal panel.

  As shown in FIG. 3, the liquid crystal device includes a liquid crystal panel 100, an image signal supply circuit 300, a first frame memory 62 and a second frame memory 63, a timing control circuit 400, and a power supply circuit 700 as main parts.

  The timing control circuit 400 is configured to output various timing signals used in each unit. A timing signal output means that is a part of the timing control circuit 400 generates a dot clock that is a minimum unit clock and scans each pixel. Based on this dot clock, a Y clock signal CLY and an inverted Y clock signal are generated. CLYinv, X clock signal CLX, inverted X clock signal XCLinv, Y start pulse DY and X start pulse DX are generated. Further, in the timing control circuit 400, two types of enable signals ENB1 and ENB2 for determining the output timing of the scanning signal to be described later are generated, and the black signal supply selection corresponding to the “second selection signal” according to the present invention. A signal NRG ′ is generated.

  Input image data DATA is input to the image signal supply circuit 300 from the outside. The image signal supply circuit 300 generates two types of field data based on the input image data DATA, and generates the two types generated in a cycle in which the scanning signal is supplied to one scanning line as will be described later. Is temporarily stored in one of the first frame memory 62 and the second frame memory 63, and one type of stored field data is read from the other. The two types of field data include data for displaying one display image and data for displaying one black image.

  Then, the image signal supply circuit 300 performs a predetermined process on the read one type of field data. As an example of this predetermined processing, the image signal supply circuit 300 performs serial-parallel conversion of, for example, one type of field data to generate N-phase, for example, six-phase (N = 6) image signals VID1 to VID6. There is. Further, the image signal supply circuit 300 inverts the voltage of the generated image signal VIDk to positive polarity and negative polarity as “first polarity” and “second polarity” with respect to a predetermined reference potential v0, and then the image signal VIDk is output. As will be described later, the image signal VIDk here has a first display potential v1 (+) for displaying a display image as a narrowly-defined “image signal” according to the present invention, and the present invention. The “black signal” includes both of those having the second display potential vb (−) for displaying a black image.

  The power supply circuit 700 supplies a common power supply having a predetermined common potential LCC to the counter electrode 21 shown in FIG. In the present embodiment, the counter electrode 21 is formed on the lower side of the counter substrate 20 shown in FIG. 2 so as to face the plurality of pixel electrodes 9a.

  Next, an electrical configuration of the liquid crystal panel 100 will be described.

  As shown in FIG. 2, the liquid crystal panel 100 is provided with an internal drive circuit including a scanning line drive circuit 104, a data line drive circuit 101, and a black signal supply circuit 200 in the peripheral region of the TFT array substrate 10. .

  Although specifically described later, the scanning line driving circuit 104 can perform basic line-sequential horizontal scanning by supplying a Y clock signal CLY, an inverted Y clock signal CLYinv, and a Y start pulse DY. ing. Further, the scanning line driving circuit 104 outputs the scanning signals G1, G2,..., Gm in the order as described later at the timing based on the supplied enable signals ENB1 and ENB2.

  In the present embodiment, the main part of the data line driving circuit 101 includes a sampling signal supply circuit 101a and a sampling circuit 101b. The sampling signal supply circuit 101a, together with the timing control circuit 400 shown in FIG. 3, constitutes a main part of the “selection signal supply circuit” according to the present invention. The sampling signal supply circuit 101a is supplied with the X clock signal CLX, the inverted X clock signal CLXinv, and the X start pulse DX. When the X start pulse DX is input to the sampling signal supply circuit 101a, the sampling signal S1, corresponding to the “first selection signal” according to the present invention, at a timing based on the X clock signal CLX and the inverted X clock signal XCLXinv,. .., Sn are sequentially generated and output in a period different from the output period of the black signal supply selection signal NRG ′.

  The sampling circuit 101b includes a plurality of sampling switches 202 each composed of a P-channel or N-channel single-channel TFT or a complementary TFT.

  Further, the black signal supply circuit 200 includes a plurality of black signal supply switches 204 configured using a single channel TFT or the like similar to the sampling switch 202.

  The liquid crystal panel 100 further includes data lines 114 and scanning lines 112 wired vertically and horizontally in the image display area 10a occupying the center of the TFT array substrate, and the pixel portions 70 corresponding to the intersections are arranged in a matrix. The pixel electrodes 9a of the arranged liquid crystal elements 118 and the TFTs 116 for controlling the switching of the pixel electrodes 9a are provided. In this embodiment, the total number of scanning lines 112 is assumed to be m (where m is a natural number of 2 or more), and the total number of data lines 114 is assumed to be n (where n is a natural number of 2 or more). To do.

  As described above, for example, the image signals VID <b> 1 to VID <b> 6 that are serially / parallel-developed in six phases are supplied to the liquid crystal panel 100 via the image signal lines 171.

  As shown in FIG. 4, in the sampling circuit 101b, each sampling switch 202 is provided on one end side of the data line 114. Then, N sampling switches 202 in this embodiment are grouped, and sampling signals Si (i = 1, 2,..., N) are input to the sampling switches 202 belonging to the group. The The sampling switch 202 belonging to one group has N data lines, in this embodiment, six data lines 114 as one group, and displays a display image on the data lines 114 belonging to the first group according to the sampling signal Si. The image signal VIDk is sampled and supplied. That is, the data line 114 belonging to the first group and the image signal line 171 are electrically connected via the sampling switch 202 belonging to the first group. Therefore, in this embodiment, since the n data lines 114 are driven for each data line 114 belonging to one group, the driving frequency can be suppressed.

  As shown in FIG. 4, in the black signal supply circuit 200, each black signal supply switch 204 is provided on the other end side of the data line 114 opposite to the side on which the sampling switch 202 is provided. As described above, the black signal supply switches 204 are collectively turned on in accordance with the black signal supply selection signal NRG ′ output from the timing control circuit 400 in a period different from the sampling signal Si. The plurality of data lines 114 are collectively supplied with an image signal VIDk for displaying a black image via the black signal supply switch 204 that is turned on.

  In FIG. 4, focusing on the configuration of one pixel portion 70, the data line 114 to which the image signal VIDk is supplied is electrically connected to the source electrode of the TFT 116, while the gate electrode of the TFT 116 is The scanning line 112 to which the scanning signal Gj (where j = 1, 2, 3,..., M) is supplied is electrically connected, and the drain electrode of the TFT 116 is connected to the pixel electrode 9a of the liquid crystal element 118. Is connected. Here, in each pixel portion 70, the liquid crystal element 118 has a liquid crystal sandwiched between the pixel electrode 9 a and the counter electrode 21. Accordingly, each pixel unit 70 is arranged in a matrix corresponding to each intersection of the scanning line 112 and the data line 114.

  An image signal VIDk is supplied to the pixel electrode 9a of the liquid crystal element 118 from the data line 114 at a predetermined timing by closing the switch of the TFT 116 for a certain period. As a result, an applied voltage defined by the potentials of the pixel electrode 9 a and the counter electrode 21 is applied to the liquid crystal element 118. 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 light transmittance is increased, and light having a contrast corresponding to the image signal VIDk is emitted from the liquid crystal panel 100 as a whole.

  Here, a storage capacitor 119 is added in parallel with the liquid crystal element 118 in order to prevent the held image signal from leaking. For example, since the voltage of the pixel electrode 118 is held by the storage capacitor 119 for a time that is three orders of magnitude longer than the time when the source voltage is applied, the holding characteristics are improved, resulting in a high contrast ratio. Become.

<1-3: Operation of electro-optical device>
Next, the operation of the liquid crystal device will be described with reference to FIGS. 5 to 10 in addition to FIGS.

  First, a detailed configuration of the scanning line driving circuit 104 shown in FIG. 1 or 4 will be described with reference to FIG. FIG. 5 shows an example of the configuration of the scanning line driving circuit 104.

  Here, in the following, for the sake of simplicity, the total number of scanning lines 112 is set to m = 4, and the image display area 10a is divided into two equal parts by dividing lines 600 along the scanning lines 112 as shown in FIG. A case where region scanning is performed on the obtained first partial region 10aa and second partial region 10ab will be described.

  In FIG. 5, the main part of the scanning line driving circuit 104 corresponds to a Y-side shift register 104a to which a Y clock signal CLY, an inverted Y clock signal CLYinv, and a Y start pulse DY are input, and four scanning lines 112. And an output control unit 104b composed of four logic circuits. One logic circuit includes, for example, a NAND circuit 67 and a NOT circuit 68, and one output signal from the Y-side shift register 66 and one of two types of enable signals ENB1 or ENB2 are input to the NAND circuit 67. The The output signals of the NAND circuits 67 are output as scanning signals G1, G2, G3, and G4 to the corresponding scanning lines 112 via the NOT circuit 68.

  Next, region scanning performed on the first partial region 10aa and the second partial region 10ab will be described in detail with reference to FIGS. 6 to 9 in addition to FIGS. FIG. 6 is an explanatory diagram for explaining the generation of the image signal VIDk in the image signal supply circuit 300, FIG. 7 is a timing chart for explaining the operation of the scanning line driving circuit 104, and FIG. 4 is a timing chart showing changes with time of various signals for driving each data line 114 and each scanning line 112; Further, FIGS. 9A and 9B are explanatory views for conceptually explaining the area scanning in the present embodiment.

  In FIG. 6, the image signal supply circuit 300 supplies the first signal after the scanning signal Gj is supplied to the first scanning line 112 in each of the first and second partial regions 10aa and 10ab described later. Until the scanning signal Gj is again supplied to the scanning line 112 (hereinafter, this period may be referred to as one vertical scanning period in the present embodiment), the first pixel area 70 in the first partial region 10aa has the first pixel portion 70a. Image display for displaying a display image in the partial area 10aa is performed, and black display for displaying a black image in the second partial area 10ab is performed in each pixel unit 70 in the second partial area 10ab. The voltage of the image signal VIDk is adjusted. Further, the image signal supply circuit 300 is configured so that the first partial region 10aa and the second partial region 10ab are supplied with the scanning signal Gj to the first scanning line described above as a predetermined cycle, that is, one vertical scanning. The image signal VIDk is generated so as to be alternately switched based on the image signal VIDk for each period.

  For example, as shown in FIG. 6, the image signal supply circuit 300 generates the image signal VIDk for each ½ field based on one type of field data. The image signal VIDk is inverted in polarity with respect to a predetermined reference potential v0 for each scanning signal supply period (that is, for each horizontal scanning period), and the first display potential v1 (+) In other words, the voltage is adjusted to a voltage defined by the second display potential vb (−) and the reference potential v0. In the present embodiment, the display voltage defined by the first display potential v1 (+) and the reference potential v0 is generated as a positive voltage, and is defined by the second display potential vb (−) and the reference potential v0. The black display voltage is generated as a negative voltage. The display voltage may be generated as a negative voltage, and the black display voltage may be generated as a positive voltage. In one vertical scanning period, the image signal VIDk of the display voltage and the image signal VIDk of the black display voltage are alternately output from the image signal supply circuit 300 every scanning signal supply period. Note that the ½ field period has the same length as one vertical scanning period.

  In FIG. 6, of two vertical scanning periods adjacent to each other on the time axis, in one vertical scanning period, one scanning signal supply period in which the image signal VIDk is adjusted to the display voltage is displayed in black. The image signal VIDk is generated so as to come first relative to the other scanning signal supply period adjusted to the voltage. On the other hand, in the other vertical scanning period, one scanning signal supply period in which the image signal VIDk is adjusted to the display voltage is compared to another scanning signal supply period in which the image signal VIDk is adjusted to the black display voltage. The image signal VIDk is generated so as to come relatively later.

  Next, region scanning in one vertical scanning period will be described with reference to FIGS.

  In one vertical scanning period, scanning signals G1, G2, G3, and G4 are alternately supplied to the first partial region 10aa and the second partial region 10ab from the scanning line driving circuit 104 shown in FIG. In each of the partial region 10aa and the second partial region 10ab, the scanning signals G1 and G2 or G3 and G4 are applied to each scanning line 112 from the top to the bottom of the partial region 10aa or 10ab along the arrangement direction of the scanning lines 112, respectively. Sequentially supplied.

  As shown in FIG. 7, the start pulses SR1 to SR4 from the Y-side shift register 66 are the same for the respective scanning lines 112 so that the first partial region 10aa and the second partial region 10ab are simultaneously scanned horizontally. Output at timing. In other words, in the first partial region 10aa and the second partial region 10ab, the start pulses SR1 and SR3 corresponding to the scanning line 112 to which the scanning signal Gj is supplied first and the scanning signal Gj are supplied second. The start pulses SR2 and SR4 corresponding to the scanning line 112 are alternately output every two horizontal scanning periods. On the other hand, the enable signals ENB1 and ENB2 alternately rise from the low level to the high level every horizontal scanning period. Therefore, among the start pulses SR1 to SR4, one of the enable signals ENB1 and ENB2 output at the rising timing is selected by the logic circuit and output to the scanning line 112 as the scanning signal Gj. As a result, the scanning signals G1 to G4 are sequentially output from the scanning line driving circuit 104 as shown in FIG.

  In FIG. 8, when one vertical scanning period is started at time t0, the scanning line driving circuit 104 causes the first partial region 10aa, which is an example of “one of the two partial regions paired” according to the present invention. The first scanning signal G1 of the first partial region 10aa is supplied to the corresponding scanning line 112, and the scanning signal supply period of the first scanning line 112 which is an example of “one scanning line” according to the present invention is Be started. Note that the period from time t0 to time t3 when the first scanning signal G1 is at the high level is the scanning signal supply period of the first scanning line 112.

  In the scanning signal supply period of the first scanning line 112, sampling signals S1, S2,..., Sn, which are shift register outputs, are sequentially output from the sampling signal supply circuit 101a during a period from time t1 to time t2. Is done. The output period of the sampling signals S1, S2,..., Sn from the sampling signal supply circuit 101a is the image signal supply period. Further, the image signal VIDk adjusted to the display voltage is supplied from the image signal supply circuit 300 during the image signal supply period. In the sampling circuit 101b, the sampling signals S1, S2,..., Sn are supplied, and each sampling switch 202 belonging to the group is sequentially turned on. At this time, if serial-parallel development is employed, the sampling switches 202 belonging to the first group are collectively turned on. Particularly in the present embodiment, in one continuous image signal supply period (for example, the period from time t1 to t2 in FIG. 8), the sampling signals S1,..., Corresponding to the image signal VIDk for one line. Sn is output. Further, in another continuous image signal supply period (for example, the period from time t7 to t8 in FIG. 8), the sampling signal S1,..., Corresponding to the image signal VIDk for another line. Sn is output. In any case, the image signal VIDk is sampled only during the image signal supply period, and the image signal VIDk is supplied to the data line 114.

  The display voltage image signal VIDk is supplied to the data line 114 through the sampling switch 202 in the on state, and is supplied to the pixel unit 70 corresponding to the first scanning line 112 through the data line 114. . Thus, the image signal VIDk for displaying the display image is written in the pixel portion 70 corresponding to the first scanning line 112 during the period from the time t1 to the time t2.

  After that, at the time t3, when the scanning signal supply period of the first scanning line 112 ends, in the second partial region 10ab, which is an example of “the other of the two partial regions paired” according to the present invention, the scanning line The first scanning signal G3 of the second partial region 10ab (second in the order of output from the scanning line driving circuit 104) is supplied from the driving circuit 104 to the corresponding scanning line 112, and the second scanning is performed. The scanning signal supply period for the line 112 is started.

  The black signal supply selection signal NRG 'is output from the timing control circuit 400 during the period from time t4 to time t5 within the scanning signal supply period of the second scanning line 112. The output period of the black signal supply selection signal NRG ′ from the timing control circuit 400 is the black signal supply period. Further, during the black signal supply period, the image signal VIDk adjusted to the black display voltage (a portion indicated by a thick line in FIG. 8) is supplied from the image signal supply circuit 300. In the black signal supply circuit 200, the image signal VIDk of the black display voltage is collectively applied to the plurality of data lines 114 via the black signal supply switch 204 that is turned on in response to the black signal supply selection signal NRG ′. Supplied. Further, the image signal VIDk is supplied to the pixel unit 70 corresponding to the second scanning line 112 via each data line 114. Thus, the image signal VIDk for displaying the black image is written in the pixel portion 70 corresponding to the second scanning line 112 during the period from the time t4 to the time t5.

  Thereafter, when the scanning signal supply period of the second scanning line 112 is completed at time t6, the second partial scanning line (scanning line driving circuit) of the first partial area 10aa is received from the scanning line driving circuit 104 in the first partial area 10aa. According to the output order from 104, the third scanning signal G2 is supplied to the corresponding scanning line 112, and the scanning signal supply period of the third scanning line 112 is started.

  In the scanning signal supply period of the third scanning line 112, in the image signal supply period from time t7 to time 8, the third scanning line is the same as the pixel unit 70 corresponding to the first scanning line 112. An image signal VIDk for displaying a display image is written in the pixel unit 70 corresponding to 112.

  Subsequently, when the scanning signal supply period of the third scanning line 112 is completed at time t9, the second partial region 10ab is scanned by the second (scanning line drive) of the second partial region 10ab in the second partial region 10ab. According to the output order from the circuit 104, the fourth scanning signal G4 is supplied to the corresponding scanning line 112, and the scanning signal supply period of the fourth scanning line 112 is started.

  In the scanning signal supply period of the fourth scanning line 112, in the black signal supply period from time t10 to time 11, the fourth scanning line is similar to the pixel unit 70 corresponding to the second scanning line 112. An image signal VIDk (a portion indicated by a thick line in FIG. 8) for displaying a black image is written in the pixel unit 70 corresponding to 112.

  Thereafter, one vertical scanning period ends at time t12. As described above, the image signal VIDk of the display voltage is sequentially supplied for each data line 114 belonging to one group in the image signal supply period, whereas the image signal VIDk of the black display voltage is supplied in the black signal supply period. Collectively, the data lines 114 are supplied.

  According to the area scanning performed in one vertical scanning period as described above, a display image is displayed by the pixel unit 70 corresponding to the scanning line 112 of the first partial area 10aa as shown in FIG. After the image display is performed, the pixel portion 70 corresponding to one scanning line 112 of the second partial region 10ab located halfway ahead of the image display region 10a with respect to the one scanning line 112 is black. An image display for displaying an image is performed. In each of the first partial region 10aa and the second partial region 10ab, the pixel unit 70 corresponding to each scanning line 112 is driven line-sequentially from the top to the bottom of the partial region 10aa or 10ab.

  When one vertical scanning period ends at time t12, the image signal VIDk is adjusted to the display voltage and the black display voltage in the subsequent one vertical scanning period, as already described in the image signal supply circuit 300. The order is reversed from the one vertical scanning period described with reference to FIG. Accordingly, as shown in FIG. 9B, the first partial region 10aa and the second partial region 10ab are interchanged, and the pixel unit 70 corresponding to each scanning line 112 is located above the partial region 10aa or 10ab. Driven line-sequentially downward.

  Here, FIG. 10A schematically shows a display screen visually recognized when a moving image is displayed in the image display area 10a in the present embodiment, and FIG. 10B shows a comparative example. 3 schematically shows a display screen that is visually recognized when a moving image is displayed in the image display area 10a.

  In the present embodiment, as shown in FIG. 10A, for example, when an object 90 traveling in the direction of arrow A is displayed in the image display area 10a, when the obtained display image is observed with human eyes, After the image display is performed in the first partial area 10aa, the black image display is performed in the second partial area 10ab, so that it appears as if the display screen has been reset. Therefore, in the present embodiment, it is possible to perform image display in which an afterimage is hardly visually recognized in the image display region 10a.

  On the other hand, in the comparative example in which the same moving image as that in FIG. 10A is displayed in the image display area 10a by the conventional driving described above without performing the area scanning according to the present embodiment, for example, in FIG. As shown, an afterimage B in which the object 90 moving in the direction of the arrow A has a tail is visually recognized.

  Thus, in this embodiment, it is possible to reduce the afterimage feeling in the display image displayed in the image display area 10a. One display image and one black image are displayed every one field period, that is, every two vertical scanning periods. That is, according to the present embodiment, the scanning line driving circuit 104 and the data line driving circuit 101 are driven at double speed. Therefore, the polarity inversion frequency of the image signal VIDk can be doubled as compared with the case where such double speed driving is not performed. Therefore, it is possible to suppress the occurrence of flicker accompanying the reversal of the polarity of the image signal VIDk as being hardly visible. As a result, according to the present embodiment as described above, high-quality image display can be performed on the liquid crystal panel 100.

  Here, in the image signal supply circuit 300, the image signal VIDk is adjusted to a display voltage and a black display voltage having different polarities. In the present embodiment, the display voltage image signal VIDk and the black display voltage image signal VIDk are respectively supplied to the data lines 114 by different systems. Therefore, the sampling switch 202 or the black signal supply switch 204 can eliminate the switching response time from the display voltage of the image signal VIDk to the black display voltage and from the black display voltage to the display voltage. The writing time of the signal VIDk can be shortened.

  In the present embodiment, each of the plurality of partial areas obtained by dividing the image display area 10a by two or more division lines is either a display image display area or a black image display area. In addition, region scanning may be performed in a manner similar to the above-described procedure with a pair of two partial regions serving as a region for displaying a display image and a region for displaying a black image.

  In addition, the order of selecting scanning lines in each partial area, that is, the scanning order may be line sequential from the top as shown in FIG. 9, or may be a predetermined order different from this, for example, line sequential from the bottom or from the middle. Various scanning orders such as line sequential can be employed. In any case, as long as the scanning order is determined in advance, there is no particular problem if an image signal is supplied to the data line accordingly. However, in view of avoiding complication of signal processing in the image signal supply circuit (see FIG. 3) and avoiding complication of wiring related to the scan line (FIG. 5), the scanning order as shown in FIG. desirable.

<1-4;Modification>
A modification of the above-described first embodiment will be described with reference to FIGS. 11 and 12. FIG. 11 is a diagram showing a timing chart for explaining one operation of the liquid crystal device in the present modification. FIG. 12 is a timing chart for explaining another operation of the liquid crystal device in the present modification. FIG.

  First, with reference to FIG. 11, one operation of the liquid crystal device in the present modification will be described. In one operation example of the liquid crystal device, the image signal supply circuit 300 adjusts the image signal VIDk to the black display voltage at least during the horizontal blanking period within the scanning signal supply period of each scanning line 112 in the second partial region 10ab. . In addition, the timing control circuit 400 outputs the black signal supply selection signal NRG ′ during the horizontal blanking period of the image signal VIDk.

  In FIG. 11, when one vertical scanning period starts at time t20, in the first partial region 10aa, during the scanning signal supply period of the first scanning line 112 from time t20 to time t23, from time t21 to time 22 The image signal VIDk for displaying the display image is written in the pixel portion 70 corresponding to the first scanning line 112 during the image signal supply period up to.

  Thereafter, within the scanning signal supply period of the second scanning line 112 from time t23 to time t26, the black signal supply selection signal from the timing control circuit 400 in the period from time t24 to time t25 in the horizontal blanking period. NRG 'is output. That is, the period from time t24 to time t25 is the black signal supply period. In the period from time t24 to time t25, an image signal VIDk for displaying a black image is displayed in the pixel unit 70 corresponding to the second scanning line 112 (portion indicated by a thick line in FIG. 11). Is written.

  Thereafter, within the scanning signal supply period of the third scanning line 112 from time t26 to time t29, the pixel portion 70 corresponding to the third scanning line 112 is supplied to the pixel part 70 corresponding to the third scanning line 112 in the image signal supply period from time t27 to time t28. An image signal VIDk for displaying a display image is written. Subsequently, within the scanning signal supply period of the fourth scanning line 112 from time t29 to time t32, the pixel portion 70 corresponding to the fourth scanning line 112 is connected to the second scanning line 112 described above. Similar to the corresponding pixel unit 70, an image signal VIDk for displaying a black image is written.

  Therefore, according to one operation example of the liquid crystal device as described above, the horizontal blanking period including the black signal supply period can be made relatively short with respect to the image signal supply period.

  Next, another operation of the liquid crystal device according to this modification will be described with reference to FIG. In another operation example of the liquid crystal device, the image signal supply circuit 300 adjusts the image signal VIDk to the display voltage in one of the two scanning signal supply periods adjacent to each other on the time axis in one vertical scanning period. The signal supply period is set longer than the horizontal blanking period in which the image signal VIDk is adjusted to the black display voltage, and the horizontal blanking period is set to a length equivalent to the period during which the black signal supply selection signal NRG ′ is supplied.

  Further, the scanning line driving circuit 104 sets one length of two scanning signal supply periods adjacent to each other on the time axis as a first length corresponding to the image signal supply period, and sets the other length as a horizontal blanking line. The second length corresponding to the period and shorter than the first length is adjusted.

  In FIG. 12, the scanning signal supply period of the second scanning line 112 in the second partial region 10ab is the first period from time t41 to time t42 when the black signal supply selection signal NRG ′ is output from the timing control circuit. The image signal VIDk (the portion indicated by a thick line in FIG. 12) is adjusted to the black display voltage during the horizontal blanking period of the second length. Then, during the period from time t41 to time t42, the image signal VIDk for displaying the black image is collectively written in the pixel portion 70 corresponding to the second scanning line 112.

  The scanning signal supply period of the third scanning line 112 in the first partial region 10aa has the first length from time t42 to time t45, and is within the scanning signal supply period of the third scanning line 112. In the image signal supply period from time t43 to time t44, the image signal VIDk is adjusted to the display voltage. Then, in the image signal supply period from time t43 to time t44, the image signal VIDk for displaying the display image is written in the pixel portion 70 corresponding to the third scanning line 112.

  As described above, according to another operation example of the liquid crystal device, the writing time of the image signal VIDk for displaying the display image on each pixel unit 70 in the first partial region 10aa is compared with the first embodiment. It can be made sufficiently long.

<2; Second Embodiment>
Next, a second embodiment according to the electro-optical device of the invention will be described. In the second embodiment, the liquid crystal device as the electro-optical device is different from the first embodiment in the configuration of the internal drive circuit in the liquid crystal panel. Therefore, in the following, the configuration and operation of the liquid crystal device will be described with reference to FIGS. 13 to 15 only with respect to differences from the first embodiment. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and shown, and the overlapping description is abbreviate | omitted.

  First, the overall configuration of the liquid crystal device according to the second embodiment will be described with reference to FIGS. FIG. 13 is a block diagram showing the overall configuration of the liquid crystal device according to the second embodiment, and FIG. 14 is a block diagram showing the electrical configuration of the liquid crystal panel according to the second embodiment.

  In FIG. 13, the timing control circuit 400 further generates a precharge selection signal NRG corresponding to the “third selection signal” according to the present invention.

  In FIG. 14, in the sampling circuit 101b, six sampling switches 202 are grouped, and an OR circuit 170 is provided corresponding to the sampling switches 202 belonging to the group. The precharge selection signal NRG generated by the timing control circuit 400 is input to the sampling switches 202 belonging to the first group via the OR circuit 170, and the sampling signal Si is received from the sampling signal supply circuit 101a. Entered. Each sampling switch 202 belonging to one group samples and supplies the image signal VIDk to the corresponding data line 114 in accordance with the precharge selection signal NRG or the sampling signal Si.

  Next, the operation of the liquid crystal device according to the second embodiment will be described with reference to FIG. 15 in addition to FIGS. 13 and 14. FIG. 15 is a timing chart showing changes over time of various signals related to the operation of the liquid crystal device according to the second embodiment.

  Hereinafter, as in the first embodiment, the total number m of scanning lines 112 is set to 4, and the first partial region 10aa and the second partial region 10aa obtained by dividing the image display region 10a into two equal parts as shown in FIG. A case where region scanning is performed on the partial region 10ab will be described.

  In FIG. 15, when one vertical scanning period is started at time t50, the scanning signal G1 is supplied to the first partial region 10aa, so that the period from time t50 to time t55 is the first scanning line. A scanning signal supply period 112 is set.

  In the scanning signal supply period of the first scanning line 112, the timing control circuit 400 outputs the precharge selection signal NRG during the period from time t51 to time t52. An output period of the precharge selection signal NRG from the timing control circuit 400 is a precharge period. In the precharge period, the image signal VIDk adjusted to the positive precharge voltage defined by the third display potential v2 (+) and the reference potential v0 is related to the present invention from the image signal supply circuit 300. It is supplied as a “precharge signal”. The precharge voltage may be generated as a negative voltage corresponding to the display voltage.

  In the sampling circuit 101b, the sampling switches 202 are collectively turned on according to the precharge selection signal NRG. Then, the image signal VIDk of the precharge voltage is supplied to the plurality of data lines 114 through the sampling switch 202 in the on state, and each data line 114 is precharged.

  Thereafter, in the image signal supply period from time t53 to time t54, the sampling circuit 101b again performs sampling switches belonging to a group in accordance with the sampling signals S1, S2,..., Sn supplied from the sampling signal supply circuit 101a. Each 202 is sequentially turned on. The image signal VIDk of the display voltage supplied from the image signal supply circuit 300 is supplied to the data line 114 via the sampling switch 202 in the on state, and is supplied to the first scanning line 112 via the data line 114. It is supplied to the corresponding pixel unit 70.

  Thereafter, in the second partial region 10ab, the scanning signal G3 is supplied, so that the period from the time t55 to the time t58 becomes the scanning signal supply period of the second scanning line 112. In the black signal supply period from time t56 to time t57 within the scanning signal supply period of the second scanning line 112, the black signal supply is collectively turned on according to the black signal supply selection signal NRG ′. A black display voltage image signal VIDk (a portion indicated by a thick line in FIG. 15) is supplied to the plurality of data lines 114 through the switch 204, and the image signal VIDk is supplied to the second data line 114 through each data line 114. Are supplied to the pixel portion 70 corresponding to the scanning line 112.

  Thereafter, in the first partial region 10aa, the scanning signal G2 is supplied, so that the period from the time t58 to the time t63 becomes the scanning signal supply period of the third scanning line 112. In the scanning signal supply period of the third scanning line 112, each data line 114 was precharged during the precharging period from time t59 to time t60, as in the scanning signal supply period of the first scanning line 112. Thereafter, in the image signal supply period from time t61 to time 62, an image signal VIDk for displaying a display image on the pixel portion 70 corresponding to the third scanning line 112 is written.

  Thereafter, the scanning signal G4 is supplied to the second partial region 10ab, so that the period from time t63 to time t66 becomes the scanning signal supply period of the fourth scanning line 112. In the scanning signal supply period of the fourth scanning line 112, in the black signal supply period from time t64 to time 65, the fourth scanning line is the same as the pixel unit 70 corresponding to the second scanning line 112. An image signal VIDk for displaying a black image is written in the pixel unit 70 corresponding to 112.

  Therefore, in the second embodiment, each data line 114 is precharged by video precharge in the precharge period preceding the image signal supply period within the scan signal supply period of each scan line 112 in the first partial region 10aa. Is possible. Therefore, the image signal VIDk can be written to each data line 114 in a relatively short time during the image signal supply period.

<3; Third Embodiment>
Next, a third embodiment according to the electro-optical device of the invention will be described. In the third embodiment, a liquid crystal device as an electro-optical device is different from the first or second embodiment in that it includes a precharge signal and black signal supply circuit as described later. Therefore, hereinafter, the configuration and operation of the liquid crystal device will be described only with respect to differences from the first or second embodiment, with reference to FIGS. 16 to 18. In addition, about the structure similar to 1st or 2nd embodiment, the same code | symbol is attached | subjected and shown, and the overlapping description is abbreviate | omitted.

  First, the overall configuration of the liquid crystal device according to the third embodiment will be described with reference to FIGS. FIG. 16 is a block diagram showing the overall configuration of the liquid crystal device in the third embodiment, and FIG. 17 is a block diagram showing the electrical configuration of the liquid crystal panel in the third embodiment.

  In FIG. 16, the main part of the liquid crystal device further includes a precharge signal and black signal supply circuit 500. The precharge signal and black signal supply circuit 500 generates a precharge signal NRS and a black signal VIDb.

  In FIG. 17, the precharge signal NRS and the black signal VIDb are supplied to the same supply signal line 271. The black signal supply switch 204 in the black signal supply circuit 200 supplies the black signal VIDb on the supply signal line 271 to the plurality of data lines 114 in accordance with the black signal supply selection signal NRG ′. Further, the black signal supply switches 204 are collectively turned on according to the precharge selection signal NRG output from the timing control circuit 400 in a period different from the black signal supply selection signal NRG ′. The precharge signals NRS supplied from the precharge signal supply circuit 500 to the supply signal line 271 are supplied to the plurality of data lines 114 through the black signal supply switch 204 that is turned on. Is done.

  Next, the operation of the liquid crystal device according to the third embodiment will be described with reference to FIG. 18 in addition to FIGS. FIG. 18 is a timing chart showing changes over time of various signals related to the operation of the liquid crystal device according to the third embodiment.

  In the following, as in the first or second embodiment, the total number m of scanning lines 112 is set to 4, and the first partial area 10aa obtained by dividing the image display area 10a into two equal parts as shown in FIG. A case where the area scanning is performed on the second partial area 10ab will be described.

  In FIG. 18, when one vertical scanning period is started at time t70, the scanning signal G1 is supplied to the first partial region 10aa, so that the period from time t70 to time t75 is the first scanning. A scanning signal supply period for the line 112 is entered. In the scanning signal supply period of the first scanning line 112, the black signal supply switch 204 is turned on in response to the precharge selection signal NRG during the precharge period from time t71 to time t72. Thus, the precharge signal NRS on the signal supply line 271 generated by the precharge signal and black signal supply circuit 500 is supplied to the plurality of data lines 114 together. Thereby, each data line 114 is precharged. Thereafter, in the image signal supply period from time t73 to time t74, the image signal VIDk for displaying the display image on the pixel unit 70 corresponding to the first scanning line 112 is supplied.

  Thereafter, in the second partial region 10ab, the scanning signal G3 is supplied, so that the period from time t75 to time t78 becomes the scanning signal supply period of the second scanning line 112. In the black signal supply period from time t76 to time t77 within the scanning signal supply period of the second scanning line 112, the black signal supply is collectively turned on according to the black signal supply selection signal NRG ′. The black signal VIDb on the signal supply line 271 generated by the precharge signal and black signal supply circuit 500 (a portion indicated by a thick line in FIG. 18) is supplied to the plurality of data lines 114 through the switch 204. The Thereby, the black signal VIDb is supplied to the pixel unit 70 corresponding to the second scanning line 112 via each data line 114.

  Thereafter, in the first partial region 10aa, the scanning signal G2 is supplied, so that the period from time t78 to time t83 becomes the scanning signal supply period of the third scanning line 112. In the scanning signal supply period of the third scanning line 112, each data line 114 was precharged during the precharging period from time t79 to time t80, similarly to the scanning signal supply period of the first scanning line 112. Thereafter, in the image signal supply period from time t81 to time 82, the image signal VIDk for displaying the display image on the pixel unit 70 corresponding to the third scanning line 112 is written.

  Thereafter, the scanning signal G4 is supplied to the second partial region 10ab, so that the period from time t83 to time t86 becomes the scanning signal supply period of the fourth scanning line 112. In the scanning signal supply period of the fourth scanning line 112, in the black signal supply period from time t84 to time 85, the fourth scanning line is the same as the pixel unit 70 corresponding to the second scanning line 112. The black signal VIDb is written in the pixel portion 70 corresponding to 112.

  Therefore, in the third embodiment, each data line 114 is precharged by the normal precharge in the precharge period preceding the image signal supply period within the scan signal supply period of each scan line 112 in the first partial region 10aa. It becomes possible.

  Here, in the first to third embodiments described above, the black signal VIDb is supplied from a black signal supply circuit provided separately from the image signal supply circuit 300 on a single signal supply line as shown in FIG. Further, the black signal VIDb may be supplied to the data lines 114 from the black signal supply switch 204 in the black signal supply circuit 200 together. In this case, the difference from the third embodiment described above is that the precharge signal NRS is not supplied onto the signal supply line and only the black signal VIDb is supplied.

<4; Electronic equipment>
Next, a case where the above-described liquid crystal device is applied to various electronic devices will be described.

<4-1: Projector>
First, a projector using this liquid crystal device as a light valve will be described. FIG. 19 is a plan layout diagram illustrating a configuration example of a projector. As shown in this figure, a lamp unit 1102 including a white light source such as a halogen lamp is provided inside the projector 1100. The projection light emitted from the lamp unit 1102 is separated into three primary colors of RGB by four mirrors 1106 and two dichroic mirrors 1108 arranged in the light guide 1104, and light valves 1110R corresponding to the respective primary colors. Incident on 1110B and 1110G. These three light valves 1110R, 1110B, and 1110G are each configured using a liquid crystal module including a liquid crystal device.

  In the light valves 1110R, 1110B, and 1110G, the liquid crystal panel 100 is driven by R, G, and B primary color signals supplied from the image signal supply circuit 300, respectively. The light modulated by the liquid crystal panel 100 enters the dichroic prism 1112 from three directions. In the dichroic prism 1112, R and B light is refracted at 90 degrees, while G light travels straight. Accordingly, as a result of the synthesis of the images of the respective colors, a color image is projected onto the screen or the like via the projection lens 1114.

  Here, paying attention to the display images by the light valves 1110R, 1110B, and 1110G, the display image by the light valves 1110G needs to be horizontally reversed with respect to the display images by the light valves 1110R and 1110B.

  Note that light valves 1110R, 1110B, and 1110G receive light corresponding to the R, G, and B primary colors by the dichroic mirror 1108, and thus there is no need to provide a color filter.

<4-2: Mobile computer>
Next, an example in which the liquid crystal device is applied to a mobile personal computer will be described. FIG. 20 is a perspective view showing the configuration of this personal computer. In the figure, a computer 1200 includes a main body 1204 having a keyboard 1202 and a liquid crystal display unit 1206. The liquid crystal display unit 1206 is configured by adding a backlight to the back surface of the liquid crystal device 1005 described above.

<4-3; Mobile phone>
Further, an example in which the liquid crystal device is applied to a mobile phone will be described. FIG. 21 is a perspective view showing the configuration of this mobile phone. In the figure, a mobile phone 1300 includes a reflective liquid crystal device 1005 together with a plurality of operation buttons 1302. In the reflective liquid crystal device 1005, a front light is provided on the front surface thereof as necessary.

  In addition to the electronic devices described with reference to FIGS. 19 to 21, a liquid crystal television, a viewfinder type, a monitor direct-view type video tape recorder, a car navigation device, a pager, an electronic notebook, a calculator, a word processor, a work Examples include a station, a videophone, a POS terminal, a device equipped with a touch panel, and the like. Needless to say, the present invention can be applied to these various electronic devices.

  The present invention is not limited to the above-described embodiments, and various modifications can be made as appropriate without departing from the spirit or concept of the invention that can be read from the claims and the entire specification. A driving circuit and a driving method, an electro-optical device including the driving circuit, and an electronic apparatus including the electro-optical device are also included in the technical scope of the present invention.

It is a top view which shows the whole structure of a liquid crystal panel. It is H-H 'sectional drawing of FIG. 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 figure which shows the structural example of a scanning line drive circuit. It is explanatory drawing for demonstrating the production | generation of the image signal in an image signal supply circuit. 6 is a timing chart for explaining the operation of the scanning line driving circuit. It is a timing chart which shows a time-dependent change of the various signals for driving each data line and each scanning line. FIG. 9A and FIG. 9B are explanatory diagrams for conceptually explaining area scanning in the first embodiment. FIG. 10A is a diagram schematically showing a display screen in the first embodiment, and FIG. 10B is a diagram schematically showing a display screen in a comparative example. It is a figure which shows the timing chart for demonstrating one operation | movement of the liquid crystal device in this modification. It is a figure which shows the timing chart for demonstrating other operation | movement of the liquid crystal device in this modification. It is a block diagram which shows the whole structure of the liquid crystal device in 2nd Embodiment. It is a block diagram which shows the electric constitution of the liquid crystal panel in 2nd Embodiment. 10 is a timing chart showing changes with time of various signals related to the operation of the liquid crystal device according to the second embodiment. It is a block diagram which shows the whole structure of the liquid crystal device in 3rd Embodiment. It is a block diagram which shows the electric constitution of the liquid crystal panel in 3rd Embodiment. 12 is a timing chart illustrating changes with time of various signals related to the operation of the liquid crystal device according to the third embodiment. It is a top view which shows the structure of the projector which is an example of the electronic device to which a liquid crystal device is applied. It is a perspective view which shows the structure of the personal computer which is an example of the electronic device to which the liquid crystal device is applied. It is a perspective view which shows the structure of the mobile telephone which is an example of the electronic device to which a liquid crystal device is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10a ... Image display area, 10aa ... 1st partial area, 10ab ... 2nd partial area, 70 ... Pixel part, 100 ... Liquid crystal panel, 101 ... Data line drive circuit, 104 ... Scan line drive circuit, 112 ... Scan line, 114 Data line 118 Liquid crystal element 200 Black signal supply circuit 300 Image signal supply circuit

Claims (13)

An electro-optical panel comprising: a plurality of data lines and a plurality of scanning lines; and a plurality of pixel portions that are electrically connected to the data lines and the scanning lines and respectively include display elements in an image display area on the substrate. A driving circuit for driving an electro-optical device including:
A plurality of partial areas obtained by dividing the image display area by dividing lines along the scanning lines, alternately with respect to the plurality of partial areas, and sequentially with respect to the plurality of scanning lines in each partial area. A scanning line driving circuit for supplying a scanning signal;
Each of the data lines is connected to one end side of the data line, and has one of the first and second polarities with respect to a reference potential, and an image signal for displaying a display image in the image display area, respectively. A plurality of sampling switches to be supplied;
The image signal is supplied to the data line and connected to the other end of the data line, having a polarity different from that of the image signal and displaying a solid signal for displaying a solid image of a specific color in the image display area. A plurality of solid signal supply switches that respectively supply the data lines in a different period from
With respect to two partial regions forming a pair among the plurality of partial regions, after the scanning signal is supplied to one scanning line in each partial region, the scanning signal is supplied again to the one scanning line. Until the image signal is supplied to the pixel portion in one of the two partial regions via the sampling switch and the data line, and the solid signal is supplied to the pixel portion in the other of the two partial regions. An image signal supply circuit for supplying the image signal and the solid signal so as to be supplied via a solid signal supply switch and the data line, and so that one and the other of the two partial regions are switched at a predetermined cycle; A drive circuit for an electro-optical device. The drive circuit of the electro-optical device according to claim 1, wherein the image signal supply circuit supplies a black signal for displaying a black image as the solid image as the solid signal.   The image signal supply circuit includes the image signal and the solid signal so that one of the two partial regions and the other of the two partial regions are switched as the predetermined cycle in a cycle in which the scan signal is supplied to the one scan line. The drive circuit of the electro-optical device according to claim 1, wherein the drive circuit is supplied. The plurality of partial regions are two partial regions obtained by dividing the dividing lines so that the areas viewed in a plane are substantially equal to each other,
The scanning line driving circuit supplies the scanning signal alternately to the two partial regions and line-sequentially to the plurality of scanning lines in each partial region,
The one scanning line in the other partial region is located halfway ahead of the image display region along the data line with respect to the one scanning line in the one partial region. The drive circuit of the electro-optical device according to any one of 1 to 3. The sampling switch supplies the image signal according to a first selection signal that defines an image signal supply period,
The solid signal supply switch supplies the solid signal in accordance with a second selection signal defining a solid signal supply period;
The first selection signal is sequentially supplied to the plurality of sampling switches within a scanning signal supply period in which the scanning signal is supplied to the scanning line in one of the two partial regions, and the two partial regions And a selection signal supply circuit that collectively supplies the second selection signal to the plurality of solid signal supply switches within a scanning signal supply period in which the scanning signal is supplied to the scanning line on the other side. The drive circuit of the electro-optical device according to claim 1, wherein the drive circuit is an electro-optical device. The image signal supply circuit supplies the solid signal during a horizontal blanking period of the image signal,
The electro-optical device driving circuit according to claim 5, wherein the selection signal supply circuit supplies the second selection signal during the horizontal blanking period. The scanning line driving circuit includes:
The scanning signal supply period of the scanning line in the one partial region and the scanning signal supply period of the scanning line in the other partial region are adjacent to each other on the time axis,
The length of the scanning signal supply period of the scanning line in the one partial region is a first length corresponding to the image signal supply period.
In addition, the scanning signal is supplied so that the scanning signal supply period of the scanning line in the other partial region is a second length shorter than the first length corresponding to the horizontal blanking period. The drive circuit of the electro-optical device according to claim 6. The selection signal supply circuit further includes a third selection signal that defines a precharge period within the scanning signal supply period of the scanning line in the one partial region and prior to the supply of the first selection signal. Supply to the plurality of sampling switches together,
The image signal supply circuit supplies a precharge signal to the plurality of sampling switches at least in the precharge period;
8. The electro-optical device drive according to claim 5, wherein each of the plurality of sampling switches supplies the precharge signal to the data line according to the third selection signal. 9. circuit. A precharge signal supply circuit for supplying a precharge signal at least during the precharge period;
Each of the plurality of solid signal supply switches is provided as a precharge switch, and supplies the precharge signal to the data line according to a third selection signal defining the precharge period,
The selection signal supply circuit further supplies the third selection signal to the plurality of solid signals within the scanning signal supply period of the scanning line in the one partial region and prior to the supply of the first selection signal. The drive circuit for an electro-optical device according to any one of claims 5 to 7, wherein the supply switch is supplied together.   An electro-optical device comprising the drive circuit for the electro-optical device according to claim 1. The pixel unit includes a pixel switching element that controls the display element.
The display element is provided opposite to the pixel electrode and the pixel electrode, and an electro-optical material is sandwiched between the counter electrodes having a common potential.
The pixel switching element supplies the image signal and the solid signal supplied from the data line to the pixel electrode in response to the scanning signal supplied from the scanning line,
The electro-optical device according to claim 10, wherein the display element displays an image based on the image signal and the solid signal.   An electronic apparatus comprising the electro-optical device according to claim 10. An electro-optical panel comprising: a plurality of data lines and a plurality of scanning lines; and a plurality of pixel portions that are electrically connected to the data lines and the scanning lines and each include a display element in an image display area on the substrate. A driving method for driving an electro-optical device including:
A plurality of partial areas obtained by dividing the image display area by dividing lines along the scanning lines, alternately with respect to the plurality of partial areas, and sequentially with respect to the plurality of scanning lines in each partial area. A first step of supplying a scanning signal;
Via a sampling switch connected to one end of the data line, an image signal for displaying a display image in the image display area and having either the first polarity or the second polarity with respect to a reference potential. A second step of supplying each of the plurality of data lines;
Through the solid signal supply switch connected to the other end of the data line, a solid signal having a polarity different from that of the image signal and displaying a solid image of a specific color in the image display area is obtained. A third step of supplying each of the plurality of data lines in a period different from a period in which a signal is supplied to the data lines;
With respect to two partial regions forming a pair among the plurality of partial regions, the scanning signal is supplied to one scanning line in each partial region, and then the scanning signal is supplied again to the one scanning line. Until the image signal is supplied to the pixel portion in one of the two partial regions via the sampling switch and the data line, and the solid signal is supplied to the pixel portion in the other of the two partial regions. And a fourth step of supplying the image signal and the solid signal so that one of the two partial areas and the other are switched at a predetermined cycle. A driving method for an electro-optical device.

Images