JP2020038393A - Electro-optical device, drive method for electro-optical device, and electronic apparatus - Google Patents

Abstract

To improve the display quality of an electro-optical device.SOLUTION: The electro-optical device comprises: a plurality of scan lines; k signal lines (k is an integer of 3 or greater); a reference line given a reference potential; a pixel arranged in correspondence to each intersection of the plurality of scan lines and the k signal lines, including a holding capacitor connected to the reference lines, and holding the potential corresponding to an image signal in the holding capacitor; an image signal circuit for sequentially supplying the image signal to the k signal lines in k supply periods based on k selection signals for sequentially selecting the k signal lines during a horizontal scan period; a precharge circuit for supplying a precharge signal to a signal line among the k signal lines before being supplied with the image signal by the image signal circuit in a prescribed order during a horizontal scan period; and a control circuit for controlling the k selection signals so that at lease one of first and last supply periods among the k supply periods is extended to be longer than a prescribed supply period except the first and last supply periods among the k supply periods.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electro-optical device, a driving method of the electro-optical device, and an electronic apparatus.

  An electro-optical device that displays an image using a liquid crystal element supplies a video voltage based on an image signal that specifies the gradation of each pixel to each pixel via a data line, thereby transmitting the liquid crystal of each pixel. Control the transmission to a transmission based on the video voltage. As a result, the gradation of each pixel is set to the gradation specified by the image signal. Generally, each pixel has a storage capacitor connected in parallel with a liquid crystal element. One end of the storage capacitor is connected to a pixel electrode of the liquid crystal element, and the other end is connected to a common electrode of the liquid crystal element via a capacitance line.

  When the supply of video voltage to each pixel is insufficient, such as when the time to supply the video voltage to each pixel is insufficient, each pixel can accurately display the gradation specified by the image signal. It may not be possible. For this reason, in the conventional electro-optical device, for example, pre-charge for pre-charging the data line to a predetermined voltage level is performed to prevent insufficient writing of the video voltage to each pixel. For example, in Patent Document 1, a large number of data lines are divided into X blocks each including a predetermined number of data lines, and an image signal is applied to data lines included in an n-th block and simultaneously included in an (n + 1) -th block. There has been proposed a liquid crystal display device that applies a precharge voltage to a data line to be applied.

JP 2000-89194 A

  However, when the video voltage or the precharge voltage is supplied to the data line, a change in the voltage level of the data line is propagated to the capacitance line via the coupling capacitance between the data line and the capacitance line, and noise is generated in the capacitance line. In the conventional electro-optical device, there is a problem that display unevenness occurs due to the influence of noise generated in the capacitance line.

  In order to solve the above problem, one embodiment of the electro-optical device according to the present invention includes a plurality of scanning lines, k signal lines (k is an integer of 3 or more), a reference line to which a reference potential is applied, A pixel that includes a storage capacitor connected to the reference line and that holds a potential corresponding to an image signal in the storage capacitor, the pixel being arranged corresponding to each intersection of the scan line and the k signal lines; An image signal circuit for sequentially supplying an image signal to the k signal lines during k supply periods based on k selection signals for sequentially selecting the k signal lines during the scanning period; In the scanning period, a precharge circuit for supplying a precharge signal in a predetermined order to a signal line before the image signal circuit of the k signal lines supplies an image signal; and in the horizontal scanning period, Image signals are sequentially applied to each of the k signal lines A predetermined supply except at least one of the first supply period and the last supply period of the k supply periods, excluding the first supply period and the last supply period of the k supply periods. And a control circuit for controlling the k selection signals so as to be longer than the period.

  In one embodiment of a method for driving an electro-optical device according to the present invention, a plurality of scanning lines, k signal lines (k is an integer of 3 or more), a reference line to which a reference potential is given, A pixel that is arranged corresponding to each intersection of a scanning line and the k signal lines, includes a storage capacitor connected to the reference line, and holds a potential corresponding to an image signal in the storage capacitor; An image signal circuit for sequentially supplying image signals to the k signal lines during k supply periods based on k selection signals for sequentially selecting the k signal lines; A precharge circuit for supplying a precharge signal in a predetermined order to a signal line of the k signal lines before the image signal circuit supplies the image signal in the k signal lines. In the horizontal scanning period, At least one of a first supply period and a last supply period of the k supply periods for sequentially supplying an image signal to each of the plurality of signal lines by the first supply period of the k supply periods. The k selection signals are controlled so as to be longer than a predetermined supply period excluding a period and the last supply period.

FIG. 2 is an explanatory diagram of the electro-optical device according to the first embodiment of the present invention. FIG. 2 is a block diagram illustrating a configuration of the electro-optical device according to the first embodiment. FIG. 3 is a circuit diagram illustrating a configuration of a pixel. FIG. 3 is a diagram illustrating a relationship between a change in potential of a signal line and a change in potential of a capacitor line. FIG. 4 is a diagram illustrating operation timings in a first horizontal scanning period. FIG. 9 is a diagram illustrating operation timings during a second horizontal scanning period. FIG. 9 is a diagram illustrating operation timings in a third horizontal scanning period. FIG. 10 is a diagram illustrating operation timings in a fourth horizontal scanning period. FIG. 14 is a diagram illustrating operation timings in a fifth horizontal scanning period. FIG. 14 is a diagram showing operation timings in a sixth horizontal scanning period. FIG. 15 is a diagram showing operation timings in a seventh horizontal scanning period. It is a figure showing operation timing of the 8th horizontal scanning period. 5 is a flowchart illustrating an example of an operation of the electro-optical device according to the first embodiment. FIG. 10 is a diagram illustrating operation timings during a first horizontal scanning period according to the second embodiment of the present invention. FIG. 9 is a diagram illustrating operation timings in a first horizontal scanning period in a first modification of the first embodiment. FIG. 14 is a diagram illustrating operation timings in a second horizontal scanning period in Modification Example 1. FIG. 3 is an explanatory diagram illustrating an example of an electronic device. It is an explanatory view showing another example of electronic equipment. It is an explanatory view showing another example of electronic equipment.

<First embodiment>
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory diagram of an electro-optical device 1 according to the first embodiment of the present invention. FIG. 1 shows a configuration of a signal transmission system for the electro-optical device 1. The electro-optical device 1 includes an electro-optical panel 100, a driving integrated circuit 200 such as a driver IC (Integrated Circuit), and a flexible circuit board 300. The electro-optical panel 100 is connected to a flexible circuit board 300 on which the driving integrated circuit 200 is mounted. The electro-optical panel 100 is connected to a host CPU (Central Processing Unit) device (not shown) via the flexible circuit board 300 and the driving integrated circuit 200. The driving integrated circuit 200 is a device that receives an image signal and various control signals for drive control from the host CPU device via the flexible circuit board 300 and drives the electro-optical panel 100 via the flexible circuit board 300. is there.

  The electro-optical device 1 displays an image using a liquid crystal element. For example, the electro-optical device 1 supplies a video voltage based on an image signal designating a gray scale of each pixel to each pixel via a signal line, so that the transmittance of liquid crystal of each pixel is based on the video voltage. Control to transmittance. As a result, the gradation of each pixel is set to the gradation specified by the image signal. The electro-optical device 1 employs a polarity inversion drive in which the polarity of the voltage applied to the liquid crystal element is inverted at regular intervals in order to prevent electrical deterioration of the electro-optical material. For example, the electro-optical device 1 inverts the level of the image signal supplied to the pixel via the signal line every one vertical scanning period with respect to the center voltage of the image signal. The period for inverting the polarity can be set arbitrarily, and may be, for example, a natural number multiple of the vertical scanning period. In the present specification, the case where the voltage of the image signal is higher than a predetermined voltage such as the center voltage is defined as positive polarity, and the case where the voltage of the image signal is lower than the predetermined voltage is defined as negative polarity. .

  FIG. 2 is a block diagram illustrating a configuration of the electro-optical device 1 according to the first embodiment. The electro-optical device 1 includes a plurality of scanning lines 120, a plurality of signal lines 122, a capacitance line 124 to which a reference potential is applied, a plurality of pixels PX, an image signal circuit 140, a precharge circuit 160, and a scanning line. It has a drive circuit 180 and a control circuit 280. For example, among the blocks shown in FIG. 2, the control circuit 280, a signal line driving circuit 240 and a precharge voltage control circuit 260 described later are included in the driving integrated circuit 200. In addition, among the blocks illustrated in FIG. 2, blocks other than the control circuit 280, the signal line driving circuit 240, and the precharge voltage control circuit 260 are included in the electro-optical panel 100. The capacitance line 124 is an example of a reference line.

  The plurality of signal lines 122 are classified into, for example, a signal line group including k signal lines 122. Here, k is an integer of 3 or more. In the example shown in FIG. 2, k is 8, and the total number of signal lines 122 is 4160. Therefore, 4160 signal lines 122 are classified into 520 signal line groups including eight signal lines 122. Note that k is not limited to 8 as long as it is an integer of 3 or more. Further, the total number of the signal lines 122 is not limited to the example illustrated in FIG. For example, the total number of the signal lines 122 may be k. In this case, the number of signal line groups is one.

  Each of the plurality of pixels PX is arranged corresponding to each intersection of the plurality of scanning lines 120 and the plurality of signal lines 122. In the example shown in FIG. 2, the pixels PX are arranged in a matrix of 2160 rows × 4160 columns. Note that the number of pixels PX is not limited to the example shown in FIG. In addition, each pixel PX has a storage capacitor Cst connected to the capacitor line 124, as shown in FIG. In FIG. 2, the row of the pixels PX described at the top of the drawing is the first row, and the column of the pixels PX described at the left of the drawing is the first column. In the following, the scanning line 120 connected to the pixel PX in the m-th row is also referred to as the scanning line 120 in the m-th row, and the signal line 122 connected to the pixel PX in the n-th column is Also referred to as a signal line 122. In the example shown in FIG. 2, m is an integer of 1 or more and 2160 or less, and n is an integer of 1 or more and 4160 or less.

  The scanning signal G is supplied to the scanning line 120, and the image signal S or the precharge signal PRC is supplied to the signal line 122. The number at the end of the sign of the scanning signal G corresponds to the row number. The numbers at the end of the image signal S and the codes of the later-described write switch SWv and precharge switch SWp correspond to the column numbers. The common voltage Vcom is supplied to the capacitor line 124. The potential of the capacitor line 124 given by the common voltage Vcom, that is, the potential based on the common voltage Vcom is an example of a reference potential.

  The image signal circuit 140 sequentially supplies the image signal S to each of the eight signal lines 122 included in each signal line group, that is, each of the k signal lines 122 during the horizontal scanning period. The horizontal scanning period is a period for writing a video voltage based on the image signal S supplied to the signal line 122 in each column to the pixels PX in one row. The row to be written is selected by the scanning signal G supplied to the scanning line 120 from the scanning line driving circuit 180.

  The image signal circuit 140 includes a plurality of write selection circuits SUv provided corresponding to the plurality of signal line groups, respectively, and a signal line drive circuit 240 that outputs the image signal S to each write selection circuit SUv. For example, the write selection circuit SUv1 corresponds to a signal line group including eight signal lines 122 from the first column to the eighth column, and sets the signal line 122 to which the image signal S is supplied from the first column to the eighth column. From the eight signal lines 122 up to. The write selection circuit SUv520 corresponds to a signal line group including eight signal lines 122 from the 4153rd column to the 4160th column, and sets the signal line 122 to which the image signal S is supplied to the 4th to 4160th column. From the eight signal lines 122 up to. The image signal S is supplied to the signal line 122 selected by the write selection circuit SUv.

  Each write selection circuit SUv has eight signal lines 122 included in a corresponding signal line group, that is, k write switches SWv connected to k signal lines 122, respectively. The write switch SWv is, for example, an N-channel transistor formed of a TFT (thin film transistor) or the like, and switches between a conductive state and a non-conductive state according to the level of a write selection signal SEL received at a control terminal such as a gate. Is set to one of Note that the write switch SWv may be a P-channel transistor or a switching element other than a TFT. The configuration of each write selection circuit SUv is the same except that the connection destination of the terminals other than the control terminal of the write switch SWv differs for each write selection circuit SUv. Therefore, the configuration of the write selection circuit SUv1 will be mainly described below.

  For example, the write selection circuit SUv1 has eight write switches SWv1-SWv8. One end of each of the write switches SWv1 to SWv8 is connected to each of the eight signal lines 122 in the first to eighth columns. The other ends of the write switches SWv1 to SWv8 are connected to each other and sequentially receive the image signals S1 to S8 from the signal line driving circuit 240. Then, according to the control from the control circuit 280 described later, among the write switches SWv1 to SWv8, the write switch SWv that is set to the conductive state is sequentially switched in one horizontal scanning period. As a result, the image signals S1 to S8 sequentially output from the signal line driving circuit 240 are sequentially supplied to the corresponding signal lines 122.

  For example, when the write selection signal SEL1 is set to a selection potential such as a high level, the write switch SWv1 that receives the write selection signal SEL1 transitions to the conductive state. As a result, the image signal S1 is supplied from the signal line driving circuit 240 to the first column signal line 122, and the first column signal line 122 is charged to a video voltage based on the image signal S1. Note that the write selection signal SEL1 is also output to a write switch SWv of the same series as the write switch SWv1, for example, the write switch SWv4153 in each of the write selection circuits SUv other than the write selection circuit SUv1.

  In the example shown in FIG. 2, the write switches SWv having the same value as the remainder after dividing the number at the end of the code of the write switch SWv by 8 are the same series of write switches SWv, and the common write selection signal SEL is supplied to the control terminal. Receive at For example, the write switch SWv1 is in the same series as the write switch SWv4153, and the write switch SWv8 is in the same series as the write switch SWv4160.

  Hereinafter, the write switch SWv controlled by the write selection signal SELi is also referred to as an ith-series write switch SWv. Here, i is an integer of 1 or more and 8 or less, that is, an integer of 1 or more and k or less. The signal line 122 connected to the i-th series write switch SWv is also referred to as the i-th series signal line 122. Therefore, the number at the end of the code of the write selection signal SEL corresponds to the sequence number of the signal line 122 to be controlled. Similarly, the number at the end of the code of the precharge selection signal PSEL described later also corresponds to the sequence number of the signal line 122 to be controlled.

  The signal line drive circuit 240 outputs the image signal S for eight pixels, that is, the image signal S for k pixels as a time-serial signal to each write selection circuit SUv. For example, the signal line driving circuit 240 sequentially outputs the image signals S1 to S8 to the write selection circuit SUv1, and sequentially outputs the image signals S4153 to S4160 to the write selection circuit SUv520. The image signals S supplied to the same series of signal lines 122 are output in parallel from the signal line driving circuit 240 to the respective write selection circuits SUv. That is, the signal line driving circuit 240 outputs the respective image signals S to be supplied to the same series of signal lines 122 to each of the plurality of signal line groups in parallel.

  The precharge circuit 160 applies a precharge signal PRC to the signal line 122 of the k signal lines 122 included in each signal line group before the image signal circuit 140 supplies the image signal S in the horizontal scanning period. Supply in order. As a result, the signal line 122 before the image signal S is supplied is charged to a predetermined precharge voltage based on the precharge signal PRC. That is, the precharge circuit 160 performs precharge for charging the signal line 122 to a predetermined precharge voltage before the image signal S is supplied. Note that the predetermined order is a predetermined precharge execution order, and may be the same order as the arrangement order of the signal lines 122 or a different order.

  For example, the precharge circuit 160 includes a plurality of precharge selection circuits SUp provided corresponding to the plurality of signal line groups, a precharge voltage control circuit 260 that outputs a precharge signal PRC to each precharge selection circuit SUp, and Having. For example, the precharge selection circuit Sup1 corresponds to a signal line group including eight signal lines 122 from the first column to the eighth column, and sets the signal line 122 to which the precharge signal PRC is to be supplied from the first column to the eighth column. Select from eight signal lines 122 up to the column. The precharge selection circuit Sup520 corresponds to a signal line group including eight signal lines 122 from the 4153rd column to the 4160th column, and sets the signal line 122 to which the precharge signal PRC is to be supplied from the 4153rd column to the 4160th column. Select from eight signal lines 122 up to the column. The precharge signal PRC is supplied to the signal line 122 selected by the precharge selection circuit SUp.

  Each precharge selection circuit SUp has eight signal lines 122 included in a corresponding signal line group, that is, k precharge switches SWp connected to k signal lines 122, respectively. The precharge switch SWp is, for example, an N-channel transistor formed of a TFT or the like, and is configured to switch between a conductive state and a non-conductive state according to the level of a precharge selection signal PSEL received at a control terminal such as a gate. Is set to Note that the precharge switch SWp may be a P-channel transistor or a switching element other than a TFT. The configuration of each precharge selection circuit SUp is identical to each other, except that the signal line 122 connected to the precharge switch SWp differs for each precharge selection circuit SUp. Therefore, the configuration of the precharge selection circuit SUp1 will be mainly described below.

  For example, the precharge selection circuit SUp1 has eight precharge switches SWp1 to SWv8. One end of each of the precharge switches SWp1 to SWp8 is connected to each of the eight signal lines 122 in the first to eighth columns. The other ends of the precharge switches SWp1 to SWp8 are connected to each other and receive a precharge signal PRC from the precharge voltage control circuit 260. Then, according to the control from the control circuit 280 described later, the precharge switch SWp that is set to the conductive state is selected from the precharge switches SWp1 to SWp8. As a result, the precharge signal PRC output from the precharge voltage control circuit 260 is supplied to the signal line 122 connected to the conductive precharge switch SWp.

  For example, when the precharge selection signal PSEL1 is set to a selection potential such as a high level, a first series of precharge switches SWp such as the precharge switch SWp1 that receives the precharge selection signal PSEL1 transits to a conductive state. As a result, the precharge signal PRC is supplied from the precharge voltage control circuit 260 to the first series of signal lines 122, and the first series of signal lines 122 is charged to a precharge voltage based on the precharge signal PRC. The period in which the precharge selection signal PSEL is maintained at the selection potential is an example of a precharge period in which the precharge signal PRC is supplied to the signal line 122.

  The other end of each of the precharge switches SWp1 to SWp8 is connected to the other end of the precharge switch SWp of the precharge selection circuit SUp other than the precharge selection circuit SUp1. That is, the other ends of the precharge switches SWp1 to SWp4160 are connected to each other and receive the precharge signal PRC from the precharge voltage control circuit 260.

  A precharge voltage control circuit 260 supplies a precharge voltage based on the polarity of the image signal S to the signal line 122 based on a set value stored in an external set value storage unit (not shown). The PRC is output to a plurality of precharge switches SWp.

  The scanning line driving circuit 180 sequentially outputs a scanning signal G for selecting a row to which the image signal S is supplied to the plurality of pixels PX for each row. For example, the scanning line driving circuit 180 changes the potential of the scanning signal G1 to a selection potential such as a high level during a first horizontal scanning period in which a video voltage is written to the pixels PX in the first row.

  The control circuit 280 receives external signals such as a vertical synchronization signal defining a vertical scanning period and a horizontal synchronization signal defining a horizontal scanning period from an external host CPU device (not shown). Then, the control circuit 280 synchronously controls the scanning line driving circuit 180, the image signal circuit 140, and the precharge circuit 160 based on a signal received from the host CPU device.

  For example, the control circuit 280 controls the timing at which the image signal S is supplied to eight signal lines 122 included in each signal line group, that is, k signal lines 122, using the write selection signal SEL and the like. The control circuit 280 outputs the write selection signals SEL1 to SEL8 for selecting the signal lines 122 of the series to which the image signal S is to be supplied to the write switches SWv of each series. For example, when supplying the image signal S to the first series of signal lines 122, the control circuit 280 causes the potential of the write selection signal SEL1 to transition to the selection potential. As a result, the first series write switch SWv transitions to the conductive state, and the image signal S output from the signal line drive circuit 240 is supplied to the first series signal line 122.

  Note that the control circuit 280 adjusts the period during which the write selection signal SEL is maintained at the selection potential, thereby adjusting the length of the supply period of the image signal S to the signal lines 122 of each series. That is, in the horizontal scanning period, the control circuit 280 controls the eight signal lines 122 included in each signal line group, that is, the k supply periods for sequentially supplying the image signals S to each of the k signal lines 122. Control the length of the. For example, the control circuit 280 sets one of the first supply period and the last supply period of the k supply periods to one or more of the k supply periods excluding the first supply period and the last supply period. Longer than the predetermined supply period.

  Further, control circuit 280 outputs precharge selection signals PSEL1 to PSEL8 for selecting signal line 122 of the series to be supplied with precharge signal PRC to precharge switches SWp of each series. For example, when supplying the precharge signal PRC to the second series of signal lines 122, the control circuit 280 causes the potential of the precharge selection signal PSEL2 to transition to the selection potential. As a result, the second series of write switches SWv transitions to the conductive state, and the precharge signal PRC output from the precharge voltage control circuit 260 is supplied to the second series of signal lines 122. Operation timings of the write selection signal SEL, the precharge selection signal PSEL, and the like will be described with reference to FIGS.

  FIG. 3 is a circuit diagram showing a configuration of the pixel PX. Each pixel PX has a liquid crystal element 130, a storage capacitor Cst connected to the capacitor line 124, and a pixel transistor TRh. The liquid crystal element 130 is an electro-optical element including a pixel electrode 132 and a common electrode 134 facing each other, and a liquid crystal 136 disposed between the pixel electrode 132 and the common electrode 134. The display gradation is changed by changing the transmittance of the liquid crystal 136 according to the applied voltage between the pixel electrode 132 and the common electrode 134. Note that a common voltage Vcom, which is a constant voltage, is supplied to the common electrode 134 via a common line (not shown).

  The storage capacitor Cst is provided in parallel with the liquid crystal element 130. One terminal of the storage capacitor Cst is connected to the pixel transistor TRh, and the other terminal is connected to the common electrode 134 via the capacitor line 124.

  The pixel transistor TRh is, for example, an N-channel transistor including a TFT or the like, and is provided between the liquid crystal element 130 and the signal line 122. The pixel transistor TRh is set to one of a conductive state and a non-conductive state according to the level of the scanning signal G supplied to the scanning line 120 connected to the gate. That is, the pixel transistor TRh controls the electrical connection between the liquid crystal element 130 and the signal line 122. For example, when the scanning signal Gm is set to the selection potential, the pixel transistors TRh in each pixel PX in the m-th row transition to the conducting state at the same time or almost simultaneously.

  When the pixel transistor TRh is controlled to be conductive, a video voltage based on the image signal S supplied from the signal line 122 is applied to the liquid crystal element 130. The liquid crystal 136 is set to have a transmittance based on the image signal S when a video voltage based on the image signal S is applied. When a light source (not shown) is turned on, light emitted from the light source passes through the liquid crystal 136 of the liquid crystal element 130 of the pixel PX and is output to the outside of the electro-optical device 1. That is, when a video voltage based on the image signal S is applied to the liquid crystal element 130 and the light source is turned on, the pixel PX displays a gray scale based on the image signal S.

  The storage capacitor Cst provided in parallel with the liquid crystal element 130 is charged with a video voltage applied to the liquid crystal element 130. That is, each pixel PX holds the potential corresponding to the image signal S in the holding capacitor Cst.

  When the pixel transistor TRh is controlled to be conductive, the storage capacitor Cst and the signal line 122 are electrically connected. Therefore, a change in the potential E122 of the signal line 122 may propagate to the capacitor line 124 through the storage capacitor Cst in some cases. Also, the fluctuation of the potential E122 of the signal line 122 propagates to the capacitance line 124 due to the coupling capacitance between the signal line 122 and the capacitance line 124 (not shown). FIG. 2 shows an example of the arrangement of the capacitance lines in the row direction. However, the arrangement becomes particularly remarkable when the capacitance lines 124 are arranged so as to overlap the signal lines 122 in the column direction. In this case, a period in which the potential E124 of the capacitance line 124 becomes unstable occurs. Next, a change in the potential of the capacitor line 124 due to a change in the potential of the signal line 122 will be described with reference to FIG.

  FIG. 4 is a diagram showing a relationship between the movement of the potential E122 of the signal line 122 and the movement of the potential E124 of the capacitor line 124. FIG. 4 shows a relationship between the movement of the potential E122 of the signal line 122 and the movement of the potential E124 of the capacitor line 124 when raster display is performed by positive polarity driving. The potential E122 [i] indicates the potential E122 of the i-th signal line 122, and the potential E122 [j] indicates the potential E122 of the j-th signal line 122. In the example shown in FIG. 4, the image signal Si is supplied to the i-th sequence signal line 122, and the precharge signal PRC is supplied to the j-th sequence signal line 122. The video voltage Vvidp indicates a voltage based on the image signal Si during the positive drive, and the precharge voltage Vprcp indicates a voltage based on the precharge signal PRC during the positive drive. For example, the video voltage Vvidp is 12V, and the precharge voltage Vprcp is 4V.

  The potential E122 [i] of the i-th series signal line 122 to which the video voltage Vvidp is applied changes from the precharge voltage Vprcp to the video voltage Vvidp when the image signal Si for applying the video voltage Vvidp is supplied. I do. In this case, the potential E124 of the capacitance line 124 rises from the common voltage Vcom, and returns to the common voltage Vcom again.

  The potential E122 [j] of the j-th signal line 122 to be precharged is changed from the video voltage Vvidp to the precharge voltage Vprcp when the precharge signal PRC for applying the precharge voltage Vprcp is supplied. Transitions to. In this case, the potential E124 of the capacitance line 124 falls from the common voltage Vcom, and returns to the common voltage Vcom again.

  At the time of supplying the precharge signal PRC, the potential E124 of the capacitor line 124 changes oppositely by the same amount or about the same amount as the change of the potential E124 of the capacitor line 124 at the time of supplying the image signal Si. Therefore, by overlapping the precharge period, which is the supply period of the precharge signal PRC, with the supply period of the image signal S, the potential fluctuation of the capacitor line 124, that is, the noise superimposed on the capacitor line 124 is canceled. Hereinafter, the effect of canceling the noise superimposed on the capacitance line 124 by giving the potential fluctuation with the same or similar fluctuation amount and the opposite direction of the fluctuation to the capacitance line 124 is also referred to as a counter noise effect. When the counter noise effect is obtained, the fluctuation in the potential of the capacitor line 124 is suppressed, and the potential E124 of the capacitor line 124 is stabilized earlier than in the case where the counter noise effect is not obtained.

  In a natural image or the like, the relationship between the potential change of the capacitor line 124 when the image signal Si is supplied and the potential change of the capacitor line 124 when the precharge signal PRC is supplied is different from the example shown in FIG. The effect is not always obtained. However, in a natural image or the like, a random element is stronger than a solid image in which all pixels PX have the same pixel value. For this reason, in a natural image or the like, even when the counter noise effect cannot be obtained, there is less apparent discomfort than a solid image in which the counter noise effect cannot be obtained.

  5 to 12 show the operation timing of each horizontal scanning period H of the electro-optical device 1 when performing the raster display by the positive drive. The number in angle brackets of the sign of the potential E122 indicates the series of the signal line 122. For example, the potential E122 [1] indicates the potential E122 of the first signal line 122, and the potential E122 [8] indicates the potential E122 of the eighth signal line 122. In the examples shown in FIGS. 5 to 12, the image signal circuit 140 supplies the image signal to one of the k signal lines 122 in each of the k supply periods included in the horizontal scanning period H. Supply S. In addition, the precharge circuit 160 performs k charge cycles in each of the precharge periods corresponding to the first to (k−1) th supply periods among the k supply periods included in the horizontal scanning period H. The precharge signal PRC is supplied to one of the signal lines 122. The control circuit 280 sets the first supply period and the k-th supply period of the k supply periods included in the horizontal scanning period H to the first supply period of the k supply periods. The period is set to be longer than the other supply periods except the period and the k-th supply period.

  FIG. 5 is a diagram showing operation timings in the first horizontal scanning period H1. The first horizontal scanning period H1 is a horizontal scanning period H for writing the video voltage Vvidp to the pixels PX in the first row. In the first horizontal scanning period H1, the potential of the scanning signal G1 supplied to the first scanning line 120 is set to a high level. The scanning signals G2 to G2160 supplied to the scanning lines 120 other than the first row are maintained at a low level.

  During the high level period of each of the write selection signals SEL1 to SEL8, switching is performed in the order of the write selection signals SEL1 to SEL8. That is, the supply periods are sequentially assigned to the signal lines 122 of each series from the signal line 122 of the first series to the signal line 122 of the eighth series. As a result, the image signals S are sequentially supplied to the signal lines 122 of each series.

  Also, each high-level period of the precharge selection signals PSEL2-PSEL8 switches in accordance with the switching of each high-level period of the write selection signals SEL1-SEL7. For example, the precharge selection signal PSEL2 transitions to a high level in synchronization with the timing at which the write selection signal SEL1 transitions to a high level, and transitions to a low level after a predetermined time has elapsed. Note that the precharge selection signal PSEL1 is maintained at a low level.

  In the supply period of the first series, that is, during the period when the write selection signal SEL1 is at the high level, the precharge to the first series of signal lines 122 is not performed, and thus the video line was charged to the video voltage Vvidp in the display of the previous horizontal scanning period H. The same video voltage Vvidp is applied again to the first series of signal lines 122. Therefore, the potential E122 [1] of the first-series signal line 122 hardly changes. Therefore, potential fluctuation of the capacitance line 124 due to capacitive coupling between the first series signal line 122 and the capacitance line 124 hardly occurs. By the way, in order to create a state in which the potential E122 of the signal line 122 hardly fluctuates in the first horizontal scanning period H of each frame, a dummy pixel row which is invisible for display is provided, and the same image signal S or gray level signal as in raster display is provided. Is written to the signal line 122. Alternatively, before the first horizontal scanning period H of each frame starts, it is preferable to perform an operation such as writing the same image signal S or a gray-level signal to the signal line 122 as in the raster display.

  In the first series supply period, the second series of signal lines 122 are precharged in the second series of precharge periods in which the precharge selection signal PSEL2 is maintained at a high level. That is, the precharge signal PRC is supplied to the second-system signal line 122 during the second-system precharge period. Therefore, the potential E122 [2] of the second-system signal line 122 changes from the video voltage Vvidp to the precharge voltage Vprcp as described with reference to FIG. Then, due to the capacitive coupling between the second-series signal line 122 and the capacitor line 124, a change in the potential E122 [2] propagates to the capacitor line 124, and a potential change occurs in the capacitor line 124. As described with reference to FIG. 4, the potential E124 of the capacitance line 124 falls from the common voltage Vcom, and returns to the common voltage Vcom again.

  During the supply period of the second series, that is, during the period when the write selection signal SEL2 is at the high level, the video voltage Vvidp is applied to the second series of signal lines 122 charged to the precharge voltage Vprcp. Therefore, the potential E122 [2] of the second-system signal line 122 changes from the precharge voltage Vprcp to the video voltage Vvidp as described with reference to FIG. Then, due to the capacitive coupling between the second-series signal line 122 and the capacitor line 124, a change in the potential E122 [2] propagates to the capacitor line 124, and a potential change occurs in the capacitor line 124.

  However, in the second system supply period, the third system signal line 122 is precharged during the third system precharge period overlapping the second system supply period. For this reason, due to the counter noise effect described with reference to FIG. 4, the fluctuation of the potential E124 of the capacitor line 124 is suppressed as compared with the supply period of the first series.

  For example, in the supply period of the second series, the precharge to the signal line 122 of the third series is executed during a period when the precharge selection signal PSEL3 is at a high level. Therefore, the potential E122 [3] of the third-series signal line 122 changes from the video voltage Vvidp to the precharge voltage Vprcp. Then, due to the capacitive coupling between the third series signal line 122 and the capacitance line 124, the fluctuation of the potential E122 [3] propagates to the capacitance line 124, and the potential fluctuation occurs in the capacitance line 124. The potential fluctuation of the capacitance line 124 due to the fluctuation of the potential E122 [2] and the potential fluctuation of the capacitance line 124 due to the fluctuation of the potential E122 [3] in the opposite direction to the fluctuation of the potential E122 [2] are superimposed on each other. As described above, the noise generated in the capacitance line 124 is canceled.

  In the supply period of the second series, the fluctuation of the potential E124 of the capacitance line 124 is suppressed as compared with the supply period of the first series, so that the potential E124 of the capacitance line 124 is stabilized earlier. Therefore, the length T2 of the supply period of the second sequence can be shorter than the length T1 of the supply period of the first sequence. When the supply period ends before the potential E124 of the capacitor line 124 is stabilized, that is, before the potential E124 of the capacitor line 124 returns to the common voltage Vcom, the potential E124 of the capacitor line 124 is changed to the common voltage after the end of the supply period. Return to Vcom. In this case, the potential of the pixel electrode 132 connected to the storage capacitor Cst also changes after the end of the supply period. That is, after the end of the supply period, the potential of the pixel electrode 132 changes from the video voltage Vvidp based on the image signal S. In this case, the pixel PX cannot accurately display the gradation specified by the image signal S.

  Therefore, in the first series supply period, the supply period is completed before the potential E124 of the capacitance line 124 is stabilized by making the length T1 of the supply period longer than the length T2 of the second series supply period. Suppress. As a result, the gradation specified by the image signal S can be accurately displayed also in each pixel PX of the first system to which the image signal S is supplied during the supply period of the first system.

  In the supply period of the third series to the supply period of the seventh series, similarly to the supply period of the second series, the fluctuation of the potential E124 of the capacitance line 124 is suppressed by the counter noise effect as compared with the supply period of the first series. Is done. As described above, the supply period from the second system to the seventh system is a supply period in which the image signal S is supplied to the signal line 122 to which the precharge signal PRC has already been supplied. It includes an overlap period with a precharge period for supplying the charge signal PRC.

  In the supply period of the eighth series, that is, during the period when the write selection signal SEL8 is at the high level, the video voltage Vvidp is applied to the signal line 122 of the eighth series charged with the precharge voltage Vprcp. Therefore, the potential E122 [8] of the eighth series signal line 122 changes from the precharge voltage Vprcp to the video voltage Vvidp. Then, due to the capacitive coupling between the eighth series signal line 122 and the capacitance line 124, the fluctuation of the potential E122 [8] propagates to the capacitance line 124, and the potential fluctuation occurs in the capacitance line 124. For example, the potential E124 of the capacitance line 124 rises from the common voltage Vcom, and returns to the common voltage Vcom again.

  Note that, in the supply period of the eighth series, the precharge is not performed on the signal lines 122 of the other series. Therefore, the counter noise effect cannot be obtained in the supply period of the eighth series. As a result, in the supply period of the eighth series, the time until the potential E124 of the capacitance line 124 is stabilized is longer than in the supply periods of the second to seventh series in which the counter noise effect is obtained. Therefore, in the supply period of the eighth series, by making the length T3 of the supply period longer than the length T2 of the supply period of the second series, the supply period ends before the potential E124 of the capacitance line 124 is stabilized. Suppress. As a result, even in each pixel PX of the eighth sequence to which the image signal S is supplied during the supply period of the eighth sequence, the gradation specified by the image signal S can be accurately displayed.

  That is, the control circuit 280 makes the length T1 of the supply period of the first sequence and the length T3 of the supply period of the eighth sequence longer than the length T2 of the supply period from the second sequence to the seventh sequence. In the example illustrated in FIG. 5, the first supply period is the first supply period among eight supply periods for sequentially supplying the image signals S to each of the eight signal lines 122, The supply period of the eighth series is the last supply period of the eight supply periods. The supply periods from the second to seventh series are supply periods excluding the first supply period and the last supply period among the eight supply periods.

  That is, in the example shown in FIG. 5, the supply period of the first system is an example of the first supply period, the supply period from the second system to the seventh system is an example of the predetermined supply period, The supply period is an example of the last supply period. Accordingly, the control circuit 280 determines the lengths T1, T3 of both the first supply period and the last supply period of the eight supply periods by the first supply period and the last supply period of the eight supply periods. The length is set to be longer than the length T2 of the predetermined supply period excluding the period. Note that the control circuit 280 may set one of the first supply period and the last supply period of the eight supply periods to be longer than the predetermined supply period length T2.

  FIG. 6 is a diagram showing the operation timing in the second horizontal scanning period H2. Detailed description of the same operation as the operation described in FIG. 5 is omitted. The second horizontal scanning period H2 is a horizontal scanning period H for writing the video voltage Vvidp to the pixels PX in the second row. In the second horizontal scanning period H2, the potential of the scanning signal G2 supplied to the second scanning line 120 is set to a high level. The scanning signals G1, G3-G2160 supplied to the scanning lines 120 other than the second row are maintained at a low level.

  In the second horizontal scanning period H2, the order in which the image signals S are sequentially supplied to the signal lines 122 of the first to eighth series is different from that in the first horizontal scanning period H1. For example, during the high-level period of each of the write selection signals SEL1 to SEL8, switching is performed in the order of the write selection signals SEL2 to SEL8 and SEL1. That is, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the first supply period different between the two horizontal scan periods H of the first horizontal scan period H1 and the second horizontal scan period H2. In addition, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the last supply period different between the two horizontal scan periods H of the first horizontal scan period H1 and the second horizontal scan period H2.

  The high-level periods of the precharge selection signals PSEL3-PSEL8 and PSEL1 are sequentially switched in accordance with the switching of each of the high-level periods of the write selection signals SEL2-SEL8. For example, the precharge selection signal PSEL3 changes to a high level in synchronization with the timing at which the write selection signal SEL2 changes to a high level, and changes to a low level after a lapse of a predetermined time. Further, for example, the precharge selection signal PSEL1 changes to a high level in synchronization with the timing at which the write selection signal SEL8 changes to a high level, and changes to a low level after a predetermined time has elapsed. Note that the precharge selection signal PSEL2 is maintained at a low level.

  Therefore, in the second horizontal scanning period H2, the counter noise effect cannot be obtained in the supply period of the second system as the first supply period and the supply period of the first system as the last supply period. On the other hand, the counter noise effect is obtained in the supply period from the third to the eighth series. For this reason, the control circuit 280 makes the length T1 of the supply period of the second sequence and the length T3 of the supply period of the first sequence longer than the length T2 of the supply period from the third sequence to the eighth sequence. As a result, each pixel PX of each series can accurately display the gradation specified by the image signal S. Note that the supply periods from the third system to the eighth system shown in FIG. 6 are examples of a predetermined supply period.

  Further, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the first supply period is different between the two horizontal scanning periods H, the pixel PX to which the image signal S is supplied in the first supply period. Even when the gradation is not accurately displayed, it is possible to suppress the row of the pixels PX whose gradation is not accurately displayed from being fixed. Similarly, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the last supply period is different between the two horizontal scanning periods H, the pixel PX to which the image signal S is supplied in the last supply period Therefore, even when the gradation is not accurately displayed, the row of the pixels PX whose gradation is not accurately displayed can be prevented from being fixed.

  At the operation timings shown in FIG. 5 and FIG. 6, the control circuit 280 sets the supply period of the second sequence for supplying the image signal S to the signal line 122 of the second sequence, and the first supply period in the second horizontal scanning period H2. And in the first horizontal scanning period H1, it is allocated to a predetermined supply period. Then, the control circuit 280 makes the length T1 of the first supply period longer than the length T2 of the predetermined supply period. Further, the precharge circuit 160 does not supply the precharge signal PRC to the second series of signal lines 122 in the second horizontal scanning period H2, and does not supply the precharge signal PRC to the second series of signal lines 122 in the first horizontal scanning period H1. To supply a precharge signal PRC. In the examples shown in FIGS. 5 and 6, the second series of signal lines 122 is an example of the first signal line 122 of the k signal lines 122, and the second horizontal scanning period H2 is 2 One of the two horizontal scanning periods H is an example of a first horizontal scanning period H, and the first horizontal scanning period H1 is an example of a second horizontal scanning period H which is the other of the two horizontal scanning periods H. .

  FIG. 7 is a diagram showing the operation timing in the third horizontal scanning period H3. Detailed description of the same operation as the operation described in FIG. 5 is omitted. The third horizontal scanning period H3 is a horizontal scanning period H for writing the video voltage Vvidp to the pixels PX in the third row. In the third horizontal scanning period H3, the potential of the scanning signal G3 supplied to the third scanning line 120 is set to a high level. The scanning signals G1, G2, and G4-G2160 supplied to the scanning lines 120 other than the third row are maintained at a low level.

  In the third horizontal scanning period H3, the order in which the image signals S are sequentially supplied to the signal lines 122 of each of the first to eighth systems is determined by the first horizontal scanning period H1 and the second horizontal scanning period H2. And different. For example, during the high-level period of each of the write selection signals SEL1 to SEL8, switching is performed in the order of the write selection signals SEL3 to SEL8, SEL1, and SEL2. That is, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the first supply period different between the three horizontal scan periods H. Further, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the last supply period different in the three horizontal scanning periods H.

  The high-level periods of the precharge selection signals PSEL4-PSEL8, PSEL1, and PSEL2 are sequentially switched in accordance with the switching of the high-level periods of the write selection signals SEL3-SEL8 and SEL1. For example, the precharge selection signal PSEL4 changes to a high level in synchronization with the timing at which the write selection signal SEL3 changes to a high level, and changes to a low level after a lapse of a predetermined time. Further, for example, the precharge selection signal PSEL2 transitions to a high level in synchronization with the timing at which the write selection signal SEL1 transitions to a high level, and transitions to a low level after a predetermined time has elapsed. Note that the precharge selection signal PSEL3 is maintained at a low level.

  Therefore, in the third horizontal scanning period H3, the counter noise effect cannot be obtained in the supply period of the third system, which is the first supply period, and the supply period of the second system, which is the last supply period. On the other hand, the counter noise effect is obtained in the supply periods of the fourth to eighth series and the supply period of the first series. For this reason, the control circuit 280 sets the length T1 of the supply period of the third series and the length T3 of the supply period of the second series to the supply periods of the fourth to eighth series and the supply period of the first series. The length is set to be longer than the length T2 of each supply period. As a result, each pixel PX of each series can accurately display the gradation specified by the image signal S. Note that the supply periods of the fourth to eighth systems and the supply period of the first system shown in FIG. 7 are examples of a predetermined supply period.

  Further, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the first supply period is different in the three horizontal scanning periods H, the pixel line PX to which the image signal S is supplied in the first supply period. Even when the gradation is not accurately displayed, it is possible to suppress the row of the pixels PX whose gradation is not accurately displayed from being fixed. Similarly, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the last supply period is different in the three horizontal scanning periods H, the pixel PX to which the image signal S is supplied in the last supply period Therefore, even when the gradation is not accurately displayed, the row of the pixels PX whose gradation is not accurately displayed can be prevented from being fixed.

  FIG. 8 is a diagram showing the operation timing in the fourth horizontal scanning period H4. Detailed description of the same operation as the operation described in FIG. 5 is omitted. The fourth horizontal scanning period H4 is a horizontal scanning period H for writing the video voltage Vvidp to the pixels PX in the fourth row. In the fourth horizontal scanning period H4, the potential of the scanning signal G4 supplied to the fourth scanning line 120 is set to a high level. The scanning signals G1-G3 and G5-G2160 supplied to the scanning lines 120 other than the fourth row are maintained at a low level.

  In the fourth horizontal scanning period H4, the order in which the image signals S are sequentially supplied to the signal lines 122 of each of the first to eighth systems is changed from the first horizontal scanning period H1 to the third horizontal scanning period H3. Up to each horizontal scanning period H. For example, during the high level period of each of the write selection signals SEL1 to SEL8, switching is performed in the order of the write selection signals SEL4 to SEL8 and SEL1 to SEL3. That is, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the first supply period different in the four horizontal scanning periods H. Further, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the last supply period different in the four horizontal scanning periods H.

  The high-level periods of the precharge selection signals PSEL5-PSEL8 and PSEL1-PSEL3 are sequentially switched in accordance with the switching of the high-level periods of the write selection signals SEL4-SEL8 and SEL1-SEL2. For example, the precharge selection signal PSEL5 changes to a high level in synchronization with the timing at which the write selection signal SEL4 changes to a high level, and changes to a low level after a lapse of a predetermined time. Further, for example, the precharge selection signal PSEL3 transitions to a high level in synchronization with a timing at which the write selection signal SEL2 transitions to a high level, and transitions to a low level after a lapse of a predetermined time. Note that the precharge selection signal PSEL4 is maintained at a low level.

  Therefore, in the fourth horizontal scanning period H4, the counter noise effect cannot be obtained in the supply period of the fourth series which is the first supply period and the supply period of the third series which is the last supply period. On the other hand, a counter noise effect is obtained in the supply periods of the fifth to eighth series, the supply period of the first series, and the supply period of the second series. For this reason, the control circuit 280 sets the length T1 of the supply period of the fourth sequence and the length T3 of the supply period of the third sequence to the supply period of the fifth to eighth sequences, the supply period of the first sequence, The length is set to be longer than the length T2 of each supply period of the second series of supply periods. As a result, each pixel PX of each series can accurately display the gradation specified by the image signal S. Note that the supply periods of the fifth to eighth series, the supply period of the first series, and the supply period of the second series shown in FIG. 8 are examples of a predetermined supply period.

  Further, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the first supply period is made different in the four horizontal scanning periods H, the pixel PX to which the image signal S is supplied in the first supply period. Even when the gradation is not accurately displayed, it is possible to suppress the row of the pixels PX whose gradation is not accurately displayed from being fixed. Similarly, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the last supply period is different in the four horizontal scanning periods H, the pixel PX to which the image signal S is supplied in the last supply period Therefore, even when the gradation is not accurately displayed, the row of the pixels PX whose gradation is not accurately displayed can be prevented from being fixed.

  FIG. 9 is a diagram showing the operation timing in the fifth horizontal scanning period H5. Detailed description of the same operation as the operation described in FIG. 5 is omitted. The fifth horizontal scanning period H5 is a horizontal scanning period H for writing the video voltage Vvidp to the pixels PX in the fifth row. In the fifth horizontal scanning period H5, the potential of the scanning signal G5 supplied to the fifth scanning line 120 is set to a high level. The scanning signals G1-G4 and G6-G2160 supplied to the scanning lines 120 other than the fifth row are maintained at a low level.

  In the fifth horizontal scanning period H5, the order in which the image signals S are sequentially supplied to the signal lines 122 of each of the first to eighth series is from the first horizontal scanning period H1 to the fourth horizontal scanning period H4. Up to each horizontal scanning period H. For example, during the high level period of each of the write selection signals SEL1 to SEL8, switching is performed in the order of the write selection signals SEL5 to SEL8 and SEL1 to SEL4. That is, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the first supply period different in the five horizontal scanning periods H. Further, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the last supply period different between the five horizontal scan periods H.

  The high-level periods of the precharge selection signals PSEL6-PSEL8 and PSEL1-PSEL4 are sequentially switched in accordance with the switching of the high-level periods of the write selection signals SEL5-SEL8 and SEL1-SEL3. For example, the precharge selection signal PSEL6 transitions to a high level in synchronization with the timing at which the write selection signal SEL5 transitions to a high level, and transitions to a low level after a lapse of a predetermined time. Further, for example, the precharge selection signal PSEL4 changes to a high level in synchronization with the timing at which the write selection signal SEL3 changes to a high level, and changes to a low level after a predetermined time has elapsed. Note that the precharge selection signal PSEL5 is maintained at a low level.

  Therefore, in the fifth horizontal scanning period H5, the counter noise effect cannot be obtained in the supply period of the fifth series which is the first supply period and the supply period of the fourth series which is the last supply period. On the other hand, the counter noise effect is obtained in the supply periods from the sixth to eighth series and the supply periods from the first to third series. For this reason, the control circuit 280 determines the length T1 of the supply period of the fifth series and the length T3 of the supply period of the fourth series as the supply periods from the sixth series to the eighth series and the third series from the third series. Is longer than the length T2 of each supply period. As a result, each pixel PX of each series can accurately display the gradation specified by the image signal S. Note that the supply periods from the sixth to eighth series and the supply periods from the first to third series shown in FIG. 9 are examples of a predetermined supply period.

  Further, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the first supply period is made different in the five horizontal scanning periods H, the pixel PX to which the image signal S is supplied in the first supply period. Even when the gradation is not accurately displayed, it is possible to suppress the row of the pixels PX whose gradation is not accurately displayed from being fixed. Similarly, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the last supply period is different in the five horizontal scanning periods H, the pixel PX to which the image signal S is supplied in the last supply period Therefore, even when the gradation is not accurately displayed, the row of the pixels PX whose gradation is not accurately displayed can be prevented from being fixed.

  FIG. 10 is a diagram showing the operation timing in the sixth horizontal scanning period H6. Detailed description of the same operation as the operation described in FIG. 5 is omitted. The sixth horizontal scanning period H6 is a horizontal scanning period H for writing the video voltage Vvidp to the pixels PX in the sixth row. In the sixth horizontal scanning period H6, the potential of the scanning signal G6 supplied to the sixth scanning line 120 is set to a high level. The scanning signals G1-G5 and G7-G2160 supplied to the scanning lines 120 other than the sixth row are maintained at a low level.

  In the sixth horizontal scanning period H6, the order in which the image signals S are sequentially supplied to the signal lines 122 of each of the first to eighth lines is from the first horizontal scanning period H1 to the fifth horizontal scanning period H5. Up to each horizontal scanning period H. For example, during the high-level period of each of the write selection signals SEL1 to SEL8, switching is performed in the order of the write selection signals SEL6 to SEL8 and SEL1 to SEL5. That is, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the first supply period different in the six horizontal scanning periods H. Further, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the last supply period different in the six horizontal scanning periods H.

  The high-level periods of the precharge selection signals PSEL7, PSEL8, and PSEL1-PSEL5 are sequentially switched in accordance with the switching of the high-level periods of the write selection signals SEL6-SEL8 and SEL1-SEL4. For example, the precharge selection signal PSEL7 transitions to a high level in synchronization with the timing at which the write selection signal SEL6 transitions to a high level, and transitions to a low level after a predetermined time has elapsed. Further, for example, the precharge selection signal PSEL5 transitions to a high level in synchronization with a timing at which the write selection signal SEL4 transitions to a high level, and transitions to a low level after a predetermined time has elapsed. Note that the precharge selection signal PSEL6 is maintained at a low level.

  Therefore, in the sixth horizontal scanning period H6, the counter noise effect cannot be obtained in the supply period of the sixth series which is the first supply period and the supply period of the fifth series which is the last supply period. On the other hand, the counter noise effect is obtained in the supply period of the seventh sequence, the supply period of the eighth sequence, and the supply period of the first to fourth sequences. For this reason, the control circuit 280 determines the length T1 of the supply period of the sixth sequence and the length T3 of the supply period of the fifth sequence from the supply period of the seventh sequence, the supply period of the eighth sequence, and the first sequence. The length is set to be longer than the length T2 of each supply period of the supply periods up to four systems. As a result, each pixel PX of each series can accurately display the gradation specified by the image signal S. Note that the supply period of the seventh system, the supply period of the eighth system, and the supply periods of the first to fourth systems shown in FIG. 10 are examples of the predetermined supply period.

  Further, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the first supply period is different in the six horizontal scanning periods H, the pixel PX to which the image signal S is supplied in the first supply period. Even when the gradation is not accurately displayed, it is possible to suppress the row of the pixels PX whose gradation is not accurately displayed from being fixed. Similarly, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the last supply period is different in the six horizontal scanning periods H, the pixel PX to which the image signal S is supplied in the last supply period Therefore, even when the gradation is not accurately displayed, the row of the pixels PX whose gradation is not accurately displayed can be prevented from being fixed.

  FIG. 11 is a diagram showing the operation timing in the seventh horizontal scanning period H7. Detailed description of the same operation as the operation described in FIG. 5 is omitted. The seventh horizontal scanning period H7 is a horizontal scanning period H for writing the video voltage Vvidp to the pixels PX in the seventh row. In the seventh horizontal scanning period H7, the potential of the scanning signal G7 supplied to the seventh scanning line 120 is set to a high level. The scanning signals G1 to G6 and G8 to G2160 supplied to the scanning lines 120 other than the seventh row are maintained at a low level.

  In the seventh horizontal scanning period H7, the order in which the image signals S are sequentially supplied to the signal lines 122 of the first to eighth series is from the first horizontal scanning period H1 to the sixth horizontal scanning period H6. Up to each horizontal scanning period H. For example, during the high level period of each of the write selection signals SEL1 to SEL8, the order is switched in the order of the write selection signals SEL7, SEL8, and SEL1 to SEL6. That is, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the first supply period different in the seven horizontal scanning periods H. Further, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the last supply period different in the seven horizontal scanning periods H.

  The high-level periods of the precharge selection signals PSEL8, PSEL1-PSEL6 are sequentially switched in accordance with the switching of the high-level periods of the write selection signals SEL7, SEL8, and SEL1-SEL5. For example, the precharge selection signal PSEL8 transitions to a high level in synchronization with the timing at which the write selection signal SEL7 transitions to a high level, and transitions to a low level after a lapse of a predetermined time. Further, for example, the precharge selection signal PSEL6 transitions to the high level in synchronization with the timing at which the write selection signal SEL5 transitions to the high level, and transitions to the low level after a predetermined time has elapsed. Note that the precharge selection signal PSEL7 is maintained at a low level.

  Therefore, in the seventh horizontal scanning period H7, the counter noise effect cannot be obtained in the supply period of the seventh series which is the first supply period and the supply period of the sixth series which is the last supply period. On the other hand, the counter noise effect is obtained in the supply period of the eighth series and the supply periods of the first to fifth series. For this reason, the control circuit 280 sets the length T1 of the supply period of the seventh sequence and the length T3 of the supply period of the sixth sequence to the supply period of the eighth sequence and the supply period of the first to fifth sequences. The length is set to be longer than the length T2 of each supply period. As a result, each pixel PX of each series can accurately display the gradation specified by the image signal S. Note that the supply period of the eighth system and the supply periods of the first to fifth systems shown in FIG. 11 are examples of a predetermined supply period.

  Further, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the first supply period is different in the seven horizontal scanning periods H, the pixel line PX to which the image signal S is supplied in the first supply period. Even when the gradation is not accurately displayed, it is possible to suppress the row of the pixels PX whose gradation is not accurately displayed from being fixed. Similarly, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the last supply period is different in the seven horizontal scanning periods H, the pixel PX to which the image signal S is supplied in the last supply period Therefore, even when the gradation is not accurately displayed, the row of the pixels PX whose gradation is not accurately displayed can be prevented from being fixed.

  FIG. 12 is a diagram showing the operation timing in the eighth horizontal scanning period H8. Detailed description of the same operation as the operation described in FIG. 5 is omitted. The eighth horizontal scanning period H8 is a horizontal scanning period H for writing the video voltage Vvidp to the pixels PX in the eighth row. In the eighth horizontal scanning period H8, the potential of the scanning signal G8 supplied to the eighth scanning line 120 is set to a high level. The scanning signals G1-G7 and G9-G2160 supplied to the scanning lines 120 other than the eighth row are maintained at a low level.

  In the eighth horizontal scanning period H8, the order in which the image signals S are sequentially supplied to the signal lines 122 of each of the first to eighth series is from the first horizontal scanning period H1 to the seventh horizontal scanning period H7. Up to each horizontal scanning period H. For example, during the high level period of each of the write selection signals SEL1 to SEL8, the order is switched in the order of the write selection signals SEL8 and SEL1 to SEL7. That is, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the first supply period different in the eight horizontal scanning periods H. Further, the control circuit 280 changes the signal line 122 to which the image signal S is supplied in the last supply period in eight horizontal scanning periods H. That is, the control circuit 280 changes the signal line 122 to which the image signal S is supplied in the first supply period in k horizontal scanning periods H, and sets the signal line 122 to which the image signal S is supplied in the last supply period. Are different for k horizontal scanning periods H.

  The high-level periods of the precharge selection signals PSEL1-PSEL7 are sequentially switched in accordance with the switching of the high-level periods of the write selection signals SEL8 and SEL1-SEL6. For example, the precharge selection signal PSEL1 transitions to a high level in synchronization with the timing at which the write selection signal SEL8 transitions to a high level, and transitions to a low level after a lapse of a predetermined time. Further, for example, the precharge selection signal PSEL7 transitions to a high level in synchronization with the timing at which the write selection signal SEL6 transitions to a high level, and transitions to a low level after a predetermined time has elapsed. Note that the precharge selection signal PSEL8 is maintained at a low level.

  Therefore, in the eighth horizontal scanning period H8, the counter noise effect cannot be obtained in the supply period of the eighth series which is the first supply period and the supply period of the seventh series which is the last supply period. On the other hand, the counter noise effect is obtained in the supply period from the first to sixth series. Therefore, the control circuit 280 sets the length T1 of the supply period of the eighth sequence and the length T3 of the supply period of the seventh sequence longer than the length T2 of the supply period from the first sequence to the sixth sequence. As a result, each pixel PX of each series can accurately display the gradation specified by the image signal S. Note that the supply periods from the first system to the sixth system shown in FIG. 12 are an example of a predetermined supply period.

  Further, in the electro-optical device 1, since the signal line 122 to which the image signal S is supplied in the first supply period is different in the eight horizontal scanning periods H, the pixel PX to which the image signal S is supplied in the first supply period. Even when the gradation is not accurately displayed, it is possible to suppress the row of the pixels PX whose gradation is not accurately displayed from being fixed. Similarly, in the electro-optical device 1, the pixel line PX to which the image signal S is supplied in the last supply period is different because the signal line 122 to which the image signal S is supplied in the last supply period is different in eight horizontal scanning periods H. Therefore, even when the gradation is not accurately displayed, the row of the pixels PX whose gradation is not accurately displayed can be prevented from being fixed.

  That is, at the operation timings shown in FIG. 5 to FIG. 12, the control circuit 280 sets the precharge period and the precharge period in the supply period for supplying the image signal S to the series of signal lines 122 to which the precharge signal PRC has already been supplied. Is longer than the supply period including the overlap period with the precharge period. Further, the control circuit 280 sets the supply period for supplying the image signal S to the signal line 122 of the series to which the precharge signal PRC is not supplied, among the supply period including the overlap period with the precharge period, to the precharge signal PRC. Is longer than the supply period in which the image signal S is supplied to the signal lines 122 of the column to which the signal has already been supplied.

  In a horizontal scanning period H other than the horizontal scanning period H from the first horizontal scanning period H1 to the eighth horizontal scanning period H8, except for the scanning signal G for selecting a row of the pixel PX to be written with the video voltage Vvidp, FIG. 12 is similar to any of the operation timings shown in FIG. Note that the vertical scanning period may include a horizontal scanning period H operating at an operation timing different from the operation timings shown in FIGS. 5 to 12, for example, a horizontal scanning period H in which precharge is not performed.

  The operation timing of each horizontal scanning period H of the electro-optical device 1 in the case of performing the raster display by the negative drive is the video voltage Vvidp and the precharge voltage Vprcp in the description of FIGS. This will be described by reading the video voltage and the precharge voltage, respectively. At the time of the negative polarity driving, the potential E122 of the signal line 122 hardly changes depending on the gradation.

  FIG. 13 is a flowchart illustrating an example of the operation of the electro-optical device 1 according to the first embodiment. The operation illustrated in FIG. 13 is an example of a method for driving the electro-optical device 1. The operation illustrated in FIG. 13 is an example of a driving method of the electro-optical device 1 when setting the length of each of the eight supply periods, that is, the k supply periods in each horizontal scanning period H. . The electro-optical device 1 repeats the operation shown in FIG. 13 until the lengths of all k supply periods are set in each horizontal scanning period H.

First, in step S100, the electro-optical device 1 determines whether the supply period of the signal line 122 to be driven is the first supply period of the k supply periods. When the supply period of the signal line 122 to be driven is the first supply period, in step S200, the electro-optical device 1 sets the supply period of the signal line 122 to be driven to the length T1. On the other hand, if the supply period of the signal line 122 to be driven is not the first supply period, the operation of the electro-optical device 1 proceeds to step S120.
In step S120, the electro-optical device 1 determines whether the supply period of the signal line 122 to be driven is the last supply period of the k supply periods. If the supply period of the signal line 122 to be driven is the last supply period, in step S220, the electro-optical device 1 sets the supply period of the signal line 122 to be driven to the length T3. On the other hand, when the supply period of the signal line 122 to be driven is not the last supply period, in step S240, the electro-optical device 1 sets the supply period of the signal line 122 to be driven to a length T2 shorter than the lengths T1 and T3. Set to.

  That is, in each horizontal scanning period H, the electro-optical device 1 sets the first supply period and the last supply period of the k supply periods for sequentially supplying the image signals S to each of the k signal lines 122. , Longer than one or a plurality of predetermined supply periods excluding the first supply period and the last supply period of the k supply periods.

  The operation of the electro-optical device 1 is not limited to the example shown in FIG. For example, steps S120 and S220 may be omitted. Alternatively, steps S100 and S200 may be omitted. That is, in each horizontal scanning period H, the electro-optical device 1 sets one of the first supply period and the last supply period of the k supply periods to the first supply period and the last supply period of the k supply periods. May be longer than one or a plurality of predetermined supply periods excluding the supply period.

  As described above, in the first embodiment, in the horizontal scanning period H, the control circuit 280 controls the first supply period and the last supply period among the k supply periods for sequentially supplying the image signals S to each of the k signal lines 122. Is longer than one or more predetermined supply periods excluding the first supply period and the last supply period of the k supply periods.

  For example, the predetermined supply period is a supply period in which the image signal S is supplied to the signal line 122 to which the precharge signal PRC has already been supplied, and a precharge period in which the precharge signal PRC is supplied to the other signal lines 122. Including the overlap period. Therefore, in a predetermined supply period, a counter noise effect of canceling noise superimposed on the capacitance line 124 is obtained.

  Note that the first supply period and the last supply period during which the counter noise effect is not obtained are set longer than the predetermined supply period during which the counter noise effect is obtained, as described above. As a result, the electro-optical device 1 can prevent the first supply period and the last supply period in which the counter noise effect is not obtained from ending before the capacitance line 124 is stabilized. Therefore, even in the pixel PX to which the image signal S is supplied in the first supply period and the last supply period, the gradation specified by the image signal S can be accurately displayed. That is, the electro-optical device 1 can suppress occurrence of display unevenness and can improve display quality.

  Even if one of the first supply period and the last supply period is longer than one or a plurality of predetermined supply periods excluding the first supply period and the last supply period of the k supply periods, the supply period Display unevenness can be suppressed as compared with the case where the length is not adjusted. That is, the display quality of the electro-optical device 1 can be improved.

  Further, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the first supply period different between the two horizontal scan periods H. For this reason, even when the gradation is not accurately displayed on the pixel PX to which the image signal S is supplied in the first supply period, it is possible to suppress the row of the pixels PX whose gradation is not accurately displayed from being fixed. Similarly, the control circuit 280 makes the signal line 122 to which the image signal S is supplied in the last supply period different between the two horizontal scan periods H. For this reason, even when the gradation is not accurately displayed on the pixel PX to which the image signal S is supplied in the last supply period, it is possible to suppress the row of the pixels PX whose gradation is not accurately displayed from being fixed.

  Further, the control circuit 280 changes the signal line 122 to which the image signal S is supplied in the first supply period in the k horizontal scanning periods H. For this reason, even when the gradation is not accurately displayed on the pixel PX to which the image signal S is supplied in the first supply period, it is possible to suppress the row of the pixels PX whose gradation is not accurately displayed from being fixed. Similarly, the control circuit 280 changes the signal line 122 to which the image signal S is supplied in the last supply period in k horizontal scanning periods H. For this reason, even when the gradation is not accurately displayed on the pixel PX to which the image signal S is supplied in the last supply period, it is possible to suppress the row of the pixels PX whose gradation is not accurately displayed from being fixed.

<Second embodiment>
The configuration and operation of the electro-optical device 1 according to the second embodiment are the same as those of the electro-optical device 1 according to the above-described first embodiment, except for the timing at which the control circuit 280 supplies the precharge signal PRC to the signal line 122. .

  FIG. 14 is a diagram showing operation timings in the first horizontal scanning period H1 according to the second embodiment of the present invention. Detailed description of the same operation as the operation described in FIG. 5 is omitted.

  In the first horizontal scanning period H1, similarly to the operation timing shown in FIG. 5, the high-level periods of the write selection signals SEL1 to SEL8 are switched in the order of the write selection signals SEL1 to SEL8. Further, the high level periods of the precharge selection signals PSEL2 to PSEL8 are sequentially switched in accordance with the switching of the high level periods of the write selection signals SEL1 to SEL7. In the example shown in FIG. 14, the order in which the high-level periods of the precharge selection signals PSEL2 to PSEL8 are switched is the same as the operation timing shown in FIG. 5, but the switching timing is different from the operation timing shown in FIG. .

  For example, the precharge selection signal PSEL2 changes in synchronization with the write selection signal SEL1, similarly to the operation timing shown in FIG. However, the precharge selection signal PSEL2 transitions to a high level before the write selection signal SEL1 transitions to a high level. Then, the precharge selection signal PSEL2 transitions to a low level before the write selection signal SEL1 transitions to a low level.

  Further, for example, the precharge selection signal PSEL8 changes in synchronization with the write selection signal SEL7, similarly to the operation timing shown in FIG. However, the precharge selection signal PSEL8 transitions to a high level after the transition of the write selection signal SEL6 to a low level and before the write selection signal SEL7 transitions to a high level. Then, the precharge selection signal PSEL8 transitions to a low level before the write selection signal SEL7 transitions to a low level. Each of the precharge selection signals PSEL3-PSEL7 also changes at the same timing as the precharge selection signal PSEL8 with respect to the synchronous write selection signal SEL.

  That is, in the second embodiment, the control circuit 280 causes the precharge period that overlaps with the first supply period to precede the first supply period, leaving the period that overlaps with the first supply period. In addition, the control circuit 280 causes a precharge period that overlaps with a predetermined supply period, such as a second series supply period, to precede the predetermined supply period, leaving a period that overlaps with the predetermined supply period.

  If the driving capability of the precharge switch SWp is low, the counter noise effect may not be sufficiently obtained. For this reason, in the second embodiment, by setting the precharge period to precede the supply period, compared to the case where the precharge period does not precede the supply period, the time until the fluctuation of the potential E124 of the capacitor line 124 becomes gentler. To secure. As a result, it is possible to prevent the supply period from ending before the potential E124 of the capacitor line 124 is stabilized. Therefore, each pixel PX can accurately display the gradation specified by the image signal S.

<Modification>
Each form exemplified above can be variously modified. Specific modifications will be described below. Two or more aspects arbitrarily selected from the following examples can be appropriately combined within a range not inconsistent with each other.

<Modification 1>
FIGS. 15 and 16 are diagrams illustrating operation timings of the electro-optical device 1 according to the first modification of the first embodiment. FIGS. 15 and 16 show operation timings of the electro-optical device 1 when performing raster display with positive polarity driving. In the first modification, the precharge is executed every other supply period. That is, the precharge may be performed in accordance with one or a plurality of predetermined supply periods excluding the last supply period of the k supply periods. In the example illustrated in FIGS. 15 and 16, the precharge circuit 160 includes h supply periods corresponding to the first to (k−1) th supply periods of the k supply periods included in the horizontal scanning period H. In each of the precharge periods, the precharge signal PRC is supplied to one of the k signal lines 122. Here, h is an integer of 2 or more and k-1 or less. Further, the control circuit 280 sets the supply period corresponding to the first precharge period of the k supply periods included in the horizontal scanning period H from the supply period corresponding to the second precharge period. Lengthen.

  FIG. 15 is a diagram illustrating operation timings in the first horizontal scanning period H1 in Modification Example 1 of the first embodiment. Detailed description of the same operation as the operation described in FIG. 5 is omitted.

  In the first horizontal scanning period H1, similarly to the operation timing shown in FIG. 5, the high-level periods of the write selection signals SEL1 to SEL8 are switched in the order of the write selection signals SEL1 to SEL8. Further, the high-level periods of the precharge selection signals PSEL3, PSEL5, and PSEL7 are sequentially switched in accordance with the switching of the high-level periods of the write selection signals SEL1, SEL3, and SEL5. That is, in the first horizontal scanning period H1 of the first modification, the precharge signal PRC is sequentially supplied to the odd-numbered signal lines 122.

  For example, the precharge selection signal PSEL3 changes to a high level in synchronization with the timing at which the write selection signal SEL1 changes to a high level, and changes to a low level after a lapse of a predetermined time. Further, for example, the precharge selection signal PSEL5 transitions to a high level in synchronization with the timing at which the write selection signal SEL3 transitions to a high level, and transitions to a low level after a predetermined time has elapsed. Further, for example, the precharge selection signal PSEL7 transitions to a high level in synchronization with the timing at which the write selection signal SEL5 transitions to a high level, and transitions to a low level after a predetermined time has elapsed. Note that the precharge selection signals PSEL1, PSEL2, PSEL4, PSEL6, and PSEL8 are maintained at a low level.

  Therefore, in the first horizontal scanning period H1 of the first modification, the counter noise effect is reduced between the supply period of the first series, which is the first supply period, and the supply period of the seventh series, which is the last supply period of the odd number series. I can't get it. On the other hand, in the supply period of the third series and the supply period of the fifth series, a counter noise effect is obtained. Therefore, the control circuit 280 sets the length T1 of the supply period of the first series and the length T4 of the supply period of the seventh series to the length of each supply period of the supply period of the third series and the supply period of the fifth series. Longer than T2. As a result, each pixel PX of each series can accurately display the gradation specified by the image signal S. The supply period of the third system and the supply period of the fifth system shown in FIG. 15 are examples of a predetermined supply period.

  Further, in the case of the raster display, the potential E122 of the signal line 122 hardly changes during the supply period of the even-numbered series in the first horizontal scanning period H1 of the first modification, so that the potential E124 of the capacitor line 124 hardly changes. Therefore, the length of the supply period of the even-numbered series, for example, the length T3 of the supply period of the eighth series, which is the last supply period, is equal to the length of the supply period of the third series and the supply period of the fifth series. It may be the same as T2.

  FIG. 16 is a diagram illustrating operation timings in the second horizontal scanning period H2 according to the first modification. Detailed description of the same operations as those described in FIGS. 5 and 6 will be omitted.

  In the second horizontal scanning period H2, similarly to the operation timing shown in FIG. 5, the high-level period of each of the write selection signals SEL1 to SEL8 is switched in the order of the write selection signals SEL1 to SEL8. In addition, the high-level periods of the precharge selection signals PSEL4, PSEL6, and PSEL8 are sequentially switched in accordance with the switching of the high-level periods of the write selection signals SEL2, SEL4, and SEL6. That is, in the second horizontal scanning period H2 of the first modification, the precharge signals PRC are sequentially supplied to the even-numbered signal lines 122.

  For example, the precharge selection signal PSEL4 changes to a high level in synchronization with the timing at which the write selection signal SEL2 changes to a high level, and changes to a low level after a predetermined time has elapsed. Further, for example, the precharge selection signal PSEL6 transitions to a high level in synchronization with the timing at which the write selection signal SEL4 transitions to a high level, and transitions to a low level after a predetermined time has elapsed. Further, for example, the precharge selection signal PSEL8 transitions to a high level in synchronization with the timing at which the write selection signal SEL6 transitions to a high level, and transitions to a low level after a predetermined time has elapsed. Note that the precharge selection signals PSEL1, PSEL2, PSEL3, PSEL5, and PSEL7 are maintained at a low level.

  Therefore, in the second horizontal scanning period H2 of Modification Example 1, the counter noise effect is reduced between the supply period of the second sequence, which is the first supply period in the even-numbered sequence, and the supply period of the eighth sequence, which is the last supply period. I can't get it. On the other hand, a counter noise effect is obtained in the supply period of the fourth sequence and the supply period of the sixth sequence. For this reason, the control circuit 280 sets the length T5 of the supply period of the second series and the length T3 of the supply period of the eighth series to the length of each supply period of the supply period of the fourth series and the supply period of the sixth series. Longer than T2. As a result, each pixel PX of each series can accurately display the gradation specified by the image signal S. The supply period of the fourth system and the supply period of the sixth system shown in FIG. 15 are examples of a predetermined supply period.

  In the case of raster display, the potential E122 of the signal line 122 hardly changes during the supply period of the odd-numbered series in the second horizontal scanning period H2 of the first modification, so that the potential E124 of the capacitor line 124 hardly changes. Therefore, the length of the odd-numbered supply period, for example, the length T1 of the first supply period, which is the first supply period, is equal to the length of each supply period of the fourth and sixth supply periods. It may be the same as T2.

  Also in Modification 1, the same effects as those of the above-described first embodiment can be obtained. Note that Modification Example 1 may be applied to the above-described second embodiment. That is, in the first modification as well, the control circuit 280 may set the precharge period ahead of the synchronous write selection signal SEL while leaving an overlapping period.

  Also in the first modification, the control circuit 280 may make the signal line 122 to which the image signal S is supplied in the first supply period in the odd-numbered series different in the plurality of horizontal scanning periods H. Further, the control circuit 280 may make the signal line 122 to which the image signal S is supplied in the first supply period in the even-numbered series different in the plurality of horizontal scanning periods H. Further, the control circuit 280 may make the signal line 122 to which the image signal S is supplied in the last supply period in the odd-numbered series different in the plurality of horizontal scanning periods H. Further, the control circuit 280 may make the signal line 122 to which the image signal S is supplied in the last supply period in the even-numbered series different in the plurality of horizontal scanning periods H.

<Modification 2>
FIG. 2 described above illustrates an example in which the other ends of the precharge switches SWp1 to SWp4160 are connected to each other. However, the connection relationship of the other ends of the precharge switches SWp1 to SWp4160 is not limited to the example illustrated in FIG. For example, the other ends of the precharge switches SWp connected to the odd-numbered column signal lines 122 are connected to each other, and the other ends of the precharge switches SWp connected to the even-numbered column signal lines 122 are connected to each other. Is also good.

  In this case, during normal operation of the electro-optical device 1, the precharge voltage control circuit 260 includes the other end of the precharge switch SWp connected to the odd-numbered column signal line 122 and the even-numbered column signal line 122. The precharge signal PRC is supplied to both the other end of the precharge switch SWp connected to the precharge switch SWp. In testing the electro-optical device 1, for example, a test circuit (not shown) connects the other end of the precharge switch SWp connected to the odd-numbered column signal line 122 to the even-numbered column signal line 122. Electrically isolated from the other end of the precharge switch SWp. The test circuit is different from the other end of the precharge switch SWp connected to the odd-numbered column signal line 122 and the other end of the precharge switch SWp connected to the even-numbered column signal line 122. Supply level test signal. In this case, a short circuit between the signal lines 122 adjacent to each other can be easily detected.

<Modification 3>
In FIG. 2 described above, an example is shown in which the plurality of signal lines 122 are classified into a signal line group including k signal lines 122, but the plurality of signal lines 122 are not classified into a plurality of signal line groups. Is also good. For example, the electro-optical device 1 only needs to have k signal lines 122 to which the image signals S are sequentially supplied. That is, in the block diagram shown in FIG. 2, the signal lines 122 and the pixels PX from the ninth column to the 4160th column, the write selection circuits SUv other than the write selection circuit SUv1, and the precharge selection circuits other than the precharge selection circuit SUp1 The circuit SUp may be omitted.

<Modification 4>
In the first embodiment and the second embodiment described above, the device using the liquid crystal is exemplified as the electro-optical device, but the present invention is not limited to this. That is, any electro-optical device using an electro-optical material whose optical characteristics change with electric energy may be used. Note that an electro-optical material is a material whose optical characteristics such as transmittance and luminance change when an electric signal such as a current signal or a voltage signal is supplied. For example, the present invention can be applied to a display panel using a light-emitting element such as an organic EL (ElecTroLuminescent), an inorganic EL, or a light-emitting polymer, as in the above-described first and second embodiments.

  Further, an electrophoretic display panel using a microcapsule containing a colored liquid and white particles dispersed in the liquid as an electro-optical material is similar to the first and second embodiments described above. The present invention can be applied. Further, the present invention can be applied to a twisted ball display panel using as an electro-optical material a twisted ball which is coated in a different color for each region having a different polarity, similarly to the above-described first and second embodiments. Can be applied. The present invention can be applied to various electro-optical devices such as a toner display panel using a black toner as an electro-optical material, as in the above-described first and second embodiments.

<Modification 5>
In the development process of the present invention, the signal line 122 and the capacitance line 124 are visually recognized as display unevenness due to the noise caused by the transition operation in which the precharge switch SWp transitions from the conductive state to the non-conductive state. I know that it can happen. Hereinafter, a transition operation in which the precharge switch SWp transitions from the conductive state to the non-conductive state is also referred to as an off operation of the precharge switch SWp.
In Modification 5, a method for suppressing the occurrence of the display unevenness will be described.

In FIG. 5 of the first embodiment described above, in the first series supply period, the precharge for the second series signal line 122 is performed during the second series precharge period. The end time of the first series supply period, that is, the timing immediately after the write selection signal SEL1 transitions to the low level, is the end time of the second series precharge period, that is, the precharge selection signal PSEL2 is at the low level. Is later than the timing immediately after the transition to. On the other hand, the end time of the supply period of the second series and the end time of the precharge period of the third series are substantially the same.
Then, the inventor of the present application proposes that if the end time of the supply period of the n-th series is later than the end time of the precharge period of the (n + a) -th series executed during a period overlapping with the supply period of the n-th series, The operation of turning off the precharge switch SWp is different from the case where the end time of the supply period of the n-th series coincides with the end time of the precharge period of the (n + a) -th series which is executed overlapping with the supply period of the n-th series. It has been found that the influence of noise on the signal line 122 and the capacitance line 124 due to this increases. Here, n is an integer of 1 or more, and a is an integer of 1 or more. Note that the influence of noise on the signal line 122 and the capacitance line 124 due to the OFF operation of the precharge switch SWp is executed by overlapping the end time of the n-th supply period with the n-th supply period. It has been found that even if the time is earlier than the end time of the precharge period of the (n + a) th series, it is suppressed.

Therefore, in order to suppress the influence of noise accompanying the OFF operation of the precharge switch SWp, in FIG. 5, the end time of the precharge period of the second system is made to substantially coincide with the end time of the supply period of the first system. Is also good. Similarly, in FIG. 6, a configuration may be adopted in which the end time of the precharge period of the third series is substantially equal to the end time of the supply period of the second series. Similarly, in FIG. 7, a configuration may be adopted in which the end time of the precharge period of the fourth series is substantially equal to the end time of the supply period of the third series. Similarly, in FIG. 8, a configuration may be adopted in which the end time of the precharge period of the fifth series is substantially equal to the end time of the supply period of the fourth series. Similarly, in FIG. 9, a configuration may be adopted in which the end time of the precharge period of the sixth series is substantially coincident with the end time of the supply period of the fifth series. Similarly, in FIG. 10, a configuration may be adopted in which the end time of the precharge period of the seventh series is substantially coincident with the end time of the supply period of the sixth series. Similarly, in FIG. 11, a configuration may be adopted in which the end time of the precharge period of the eighth series is substantially coincident with the end time of the supply period of the seventh series. Similarly, in FIG. 12, a configuration may be adopted in which the end time of the precharge period of the first series is substantially coincident with the end time of the supply period of the eighth series.
In this way, the configuration in which the time difference between the end time of the supply period for a certain series and the end time of the precharge period that is executed in an overlapping manner is made equal, or the end time of the supply period is executed in an overlapping manner. Display unevenness can be suppressed by adopting a configuration that is earlier than the end time of the precharge period.

<Application example>
The present invention can be used for various electronic devices. FIGS. 17 to 19 illustrate specific embodiments of electronic devices to which the present invention is applied.

  FIG. 17 is an explanatory diagram illustrating an example of an electronic device. FIG. 17 is a perspective view of a portable personal computer 2000 employing the electro-optical device 1. The personal computer 2000 includes the electro-optical device 1 that displays various images, and a main body 2010 in which a power switch 2001 and a keyboard 2002 are installed.

  FIG. 18 is an explanatory diagram illustrating another example of the electronic apparatus. FIG. 18 is a perspective view of the mobile phone 3000. The mobile phone 3000 includes a plurality of operation buttons 3001 and scroll buttons 3002, and the electro-optical device 1 that displays various images. By operating the scroll buttons 3002, the screen displayed on the electro-optical device 1 is scrolled.

  FIG. 19 is an explanatory diagram illustrating another example of the electronic apparatus. FIG. 19 is a schematic diagram illustrating a configuration of a projection display device 4000 that employs the electro-optical device 1. The projection display device 4000 is, for example, a three-plate projector. An electro-optical device 1R shown in FIG. 19 is an electro-optical device 1 corresponding to a red display color, an electro-optical device 1G is an electro-optical device 1 corresponding to a green display color, and an electro-optical device 1B is It is an electro-optical device 1 corresponding to a blue display color.

  That is, the projection display device 4000 has three electro-optical devices 1R, 1G, and 1B corresponding to display colors of red, green, and blue, respectively. The illumination optical system 4001 supplies a red component r of the light emitted from the illumination device 4002, which is a light source, to the electro-optical device 1R, supplies a green component g to the electro-optical device 1G, and supplies a blue component b to the electro-optical device 1B. To supply. Each of the electro-optical devices 1R, 1G, and 1B functions as a light modulator such as a light valve that modulates each monochromatic light supplied from the illumination optical system 4001 according to a display image. The projection optical system 4003 combines the light emitted from each of the electro-optical devices 1R, 1G, and 1B and projects the combined light on the projection surface 4004. That is, the present invention is also applicable to a liquid crystal projector.

  Note that examples of the electronic device to which the present invention is applied include a personal digital assistant (PDA), in addition to the devices illustrated in FIG. 1 and FIGS. 17 to 19. Other examples include a digital still camera, a television, a video camera, a car navigation device, an in-vehicle display (instrument panel), an electronic notebook, electronic paper, a calculator, a word processor, a workstation, a videophone, and a POS terminal. Further, a printer, a scanner, a copying machine, a video player, a device equipped with a touch panel, and the like are included.

  1, 1B, 1G, 1R: electro-optical device, 100: electro-optical panel, 120: scanning line, 122: signal line, 124: capacitance line, 130: liquid crystal element, 132: pixel electrode, 134: common electrode, 136 ... Liquid crystal, 140: image signal circuit, 160: precharge circuit, 180: scanning line drive circuit, 200: drive integrated circuit, 240: signal line drive circuit, 260: precharge voltage control circuit, 280: control circuit, 300 ... Flexible circuit board, 2000 personal computer, 2001 power switch, 2002 keyboard, 2010 main body, 3000 mobile phone, 3001 operation buttons, 3002 scroll buttons, 4000 projection display device, 4001 illumination optical system , 4002: illumination device, 4003: projection optical system, 4004: projection surface, Cst Storage capacitor, PX ... pixel, SUp ... precharge selection circuit, SUV ... write select circuit, SWp ... precharge switch, SWv ... write switches, TRh ... pixel transistor.

Claims (15)

Multiple scan lines;
k signal lines (k is an integer of 3 or more);
A reference line to which a reference potential is given;
A pixel that is arranged corresponding to each intersection of the plurality of scanning lines and the k signal lines, includes a storage capacitor connected to the reference line, and holds a potential corresponding to an image signal in the storage capacitor; ,
An image signal circuit that sequentially supplies image signals to the k signal lines during a horizontal scanning period during k supply periods based on k selection signals that sequentially select the k signal lines;
In the horizontal scanning period, a precharge circuit that supplies a precharge signal in a predetermined order to a signal line before the image signal circuit of the k signal lines supplies an image signal;
In the horizontal scanning period, at least one of a first supply period and a last supply period of the k supply periods for sequentially supplying an image signal to each of the k signal lines is replaced with the k supply lines. A control circuit for controlling the k selection signals so as to be longer than a predetermined supply period excluding the first supply period and the last supply period in a period,
An electro-optical device comprising: The control circuit controls the k selection signals so that both the first supply period and the last supply period are longer than the predetermined supply period.
The electro-optical device according to claim 1, wherein: The predetermined supply period is a supply period for supplying an image signal to a signal line to which a precharge signal has already been supplied, and includes an overlap period with a precharge period for supplying a precharge signal to another signal line.
The electro-optical device according to claim 1, wherein: The control circuit controls the k selection signals so that a signal line to which an image signal is supplied in the first supply period is different between the two horizontal scanning periods.
The electro-optical device according to claim 1, wherein: The control circuit controls the k selection signals so that a signal line to which an image signal is supplied in the first supply period is different in k horizontal scanning periods.
The electro-optical device according to any one of claims 1 to 4, wherein: The control circuit controls the k selection signals so that a signal line to which an image signal is supplied in the last supply period is different between two horizontal scanning periods.
The electro-optical device according to any one of claims 1 to 5, wherein: The control circuit controls the k selection signals so that a signal line to which an image signal is supplied in the last supply period is different in k horizontal scanning periods.
The electro-optical device according to claim 1, wherein: The control circuit may precede the first supply period with a precharge period that overlaps with the first supply period, leaving a period that overlaps with the first supply period, and perform a precharge period that overlaps with the predetermined supply period. Controlling the k selection signals so that a period precedes the predetermined supply period, leaving a period overlapping with the predetermined supply period,
The electro-optical device according to any one of claims 1 to 7, wherein: The control circuit sets a supply period for supplying an image signal to a first signal line of the k signal lines to a first supply period in a first horizontal scan period which is one of the two horizontal scan periods. In the second horizontal scanning period, which is the other of the two horizontal scanning periods, and is assigned to the predetermined supply period, and the k selection signals are set so that the first supply period is longer than the predetermined supply period. Control the
The precharge circuit does not supply a precharge signal to the first signal line during the first horizontal scanning period, and supplies a precharge signal to the first signal line during the second horizontal scanning period. Supply,
The electro-optical device according to any one of claims 1 to 8, wherein: The end time of the supply period coincides with the end time of the precharge period overlapping the supply period,
The electro-optical device according to claim 1, wherein: The end time of the supply period is earlier than the end time of the precharge period overlapping the supply period,
The electro-optical device according to claim 1, wherein:   An electronic apparatus comprising the electro-optical device according to claim 1. Multiple scan lines;
k signal lines (k is an integer of 3 or more) as a group;
A reference line to which a reference potential is given;
A pixel that is arranged corresponding to each intersection of the plurality of scanning lines and the plurality of signal lines, includes a storage capacitor connected to the reference line, and holds a potential corresponding to an image signal in the storage capacitor;
An image signal circuit that supplies an image signal to one of the k signal lines in each of k supply periods included in the horizontal scanning period;
In each of the precharge periods corresponding to the first to (k-1) th supply periods of the k supply periods included in the horizontal scanning period, one of the k signal lines is used. A precharge circuit for supplying a precharge signal to the signal line of
One of the first supply period and the k-th supply period of the k supply periods included in the horizontal scanning period is changed to the first supply period of the k supply periods. A control circuit that controls the k supply periods so as to be longer than the other supply periods except for the period and the k-th supply period;
An electro-optical device comprising: Multiple scan lines;
k signal lines (k is an integer of 3 or more) as a group;
A reference line to which a reference potential is given;
A pixel that is arranged corresponding to each intersection of the plurality of scanning lines and the plurality of signal lines, includes a storage capacitor connected to the reference line, and holds a potential corresponding to an image signal in the storage capacitor;
An image signal circuit that supplies an image signal to one of the k signal lines in each of k supply periods included in the horizontal scanning period;
H precharges (h is an integer of 2 or more and k-1 or less) corresponding to the first to (k-1) th supply periods of the k supply periods included in the horizontal scanning period. A precharge circuit that supplies a precharge signal to one of the k signal lines during each of the periods;
The k supply periods corresponding to the first precharge period of the k supply periods included in the horizontal scanning period are set to be longer than the supply period corresponding to the second precharge period. A control circuit for controlling the supply period of
An electro-optical device comprising: A plurality of scanning lines, k (k is an integer of 3 or more) signal lines, a reference line to which a reference potential is applied, and each intersection of the plurality of scanning lines and the k signal lines. A pixel that includes a storage capacitor connected to the reference line and holds a potential corresponding to an image signal in the storage capacitor, and k pixels that sequentially select the k signal lines during a horizontal scanning period. An image signal circuit for sequentially supplying image signals to the k signal lines during k supply periods based on the selection signal; and an image signal circuit among the k signal lines during the horizontal scanning period. A precharge circuit for supplying a precharge signal in a predetermined order to a signal line before supplying an image signal, the method for driving an electro-optical device,
In the horizontal scanning period, at least one of a first supply period and a last supply period of the k supply periods for sequentially supplying an image signal to each of the k signal lines is replaced with the k supply lines. Controlling the k selection signals to be longer than a predetermined supply period excluding the first supply period and the last supply period in a period,
A method for driving an electro-optical device, comprising:

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