JP2005326750A - Drive circuit and method for electrooptical panel, electro-optical apparatus and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the influence due to malfunctions of a display element, in a non-selection pixel section of an electro-optical panel. <P>SOLUTION: The drive circuit for driving an electro-optical panel comprises a plurality of switching elements for selection for respectively supplying image signals to data line according to selection signals, a scanning line drive circuit for supplying scanning signals to respective scanning lines, a selection signal supply circuit for supplying selection signal to the switching elements for selection, an image signal supply circuit which supplies the image signal to the respective switching elements for selection maintaining the image signals at the first potential at a first polarity within an image signal regulation period, at a second potential at a second polarity and at a display potential in the images supply period. The scanning line drive circuit ends the supply of the scanning signal within the image signal regulation period. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  As an example of an electro-optical panel driven by this type of drive circuit, Patent Document 1 or 2 discloses a liquid crystal in which a liquid crystal that is an example of an electro-optical material is sandwiched between a pixel electrode and a counter electrode in each pixel portion. A liquid crystal panel that displays an image by applying a voltage defined by the potential of each of a pixel electrode and a counter electrode to the element is disclosed. In this liquid crystal panel, the liquid crystal element is AC driven as follows in order to prevent deterioration of the liquid crystal due to application of a DC component by the drive circuit.

  A scanning signal output from the driving circuit is supplied to each pixel portion via the scanning line, and an image signal having a voltage inverted to the first polarity or the second polarity is supplied from the driving circuit via the data line. . Here, each data line is provided with a selection switching element that defines an image signal supply period in which an image signal is supplied to the data line, and the image signal output from the drive circuit via the selection switching element is data. Supplied to the wire. Then, in the pixel portion selected by the supply of the scanning signal, the liquid crystal element performs image display based on the supplied image signal. Here, for example, in the normally white mode display, when the black level is displayed based on the image signal whose polarity is inverted after the black level is displayed by the liquid crystal element, the change in the voltage of the data line is the most. growing.

  According to Patent Document 1, when an image is displayed on a liquid crystal panel having a larger number of scanning lines than the number of scanning lines of a video source, the driving circuit performs high-speed scanning twice the normal operation of the display period in the blanking period. . According to Patent Document 2, the drive circuit controls the input / output characteristics of the image signal according to the type of the liquid crystal panel.

  Each scanning line is driven line-sequentially by supplying a scanning signal. Then, after the image signal supply period has elapsed, the polarity of the image signal is reversed, and at the same time, the supply of the scanning signal to the scanning line is completed, and the selection of the scanning line is completed.

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

  However, in the liquid crystal panel as described above, in the pixel portion located near the center of the display screen, even when the supply of the scanning signal is terminated due to the wiring resistance or the wiring capacitance, the timing at which the selection of the scanning line is terminated is There may be a delay with respect to the polarity inversion timing of the image signal. As a result, the AC component of the image signal is written to the data line via the capacitive coupling of the selection switching element, and further to the liquid crystal element via the data line, which may cause the liquid crystal element to malfunction. When the change in the voltage of the image signal due to the polarity inversion is large, the influence of the above-described malfunction of the liquid crystal element on the display image is increased, resulting in a problem that the quality of the display image is remarkably deteriorated.

  The present invention has been made in view of the above problems, and a driving circuit and a driving method capable of reducing the influence of a malfunction of a display element in a non-selected pixel portion in an electro-optical panel, and the electro-optical panel and driving It is an object of the present invention to provide an electro-optical device including a circuit and various electronic devices including such an electro-optical device.

  In order to solve the above problems, the drive circuit for the electro-optical panel of the present invention is electrically connected to the plurality of scanning lines and the plurality of data lines and the scanning line and the data lines on the substrate, respectively. A drive circuit for driving an electro-optical panel including a plurality of pixel units each including a display element, and a plurality of image signals supplied to the data lines in response to a selection signal defining an image signal supply period A switching element for selection, a scanning line driving circuit for supplying a scanning signal for selecting the plurality of scanning lines to each of the plurality of scanning lines, and a scanning signal supply for supplying the scanning signal to the scanning lines A selection signal supply circuit for supplying the selection signal to the selection switching element corresponding to one or a plurality of data lines of the plurality of data lines within a period; The scanning signal supply period of the one scanning line on the time axis with respect to one scanning line to which the scanning signal is supplied relatively earlier and another scanning line to which the scanning signal is supplied relatively later The image signal is set to a predetermined potential within an image signal adjustment period that is located after the supply of the selection signal is completed and before the start of the supply of the selection signal in the scanning signal supply period of the other scanning line. On the other hand, the polarity is inverted between the first polarity and the second polarity, and the image signal has a predetermined first potential in the first polarity and a predetermined second potential in the second polarity within the image signal adjustment period. And an image signal supply circuit for supplying the image signal to the selection switching element as a display potential adjusted for each data line during the image signal supply period. It includes bets, the scanning line driving circuit, the image signal within the adjustment period, to end the supply of the scanning signal to the one scanning line.

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

  When driving the electro-optical panel, each scanning line is selected by a scanning signal supplied from a scanning line driving circuit. Then, when a scanning signal is supplied from the selected scanning line, the corresponding pixel portion is in a selected state. For example, the pixel portion is selected by supplying a scanning signal from the selected scanning line and turning on the pixel switching element.

  Each selection switching element is supplied with an image signal from an image signal supply circuit. In the scanning signal supply period of each scanning line, the selection switching element corresponding to one or a plurality of data lines among the plurality of data lines is in the on state during the image signal supply period in which the selection signal is supplied from the selection signal supply circuit. Thus, an image signal is supplied to one or a plurality of data lines via a corresponding selection switching element.

  In the pixel portion selected by the scanning signal, an image signal is supplied to the display element from the corresponding data line. The display element is AC driven by the supplied image signal to display an image.

  Here, the image signal supply circuit adjusts the potential of the image signal as follows and supplies it to each switching element for selection. That is, the image signal supply circuit adjusts the image signal to the display potential for each data line during the image signal supply period. On the other hand, the image signal supply circuit performs one scan on the time axis for one scan line selected relatively earlier among the plurality of scan lines and another scan line selected relatively later. A predetermined period that is located after the supply of the selection signal in the scanning signal supply period of the line and after the supply of the selection signal in the scanning signal supply period of the other scanning line is started is an image signal adjustment period. To do. The length of the image signal adjustment period is preferably changed according to the type of the electro-optical panel.

  Then, the image signal supply circuit reverses the polarity of the image signal to a first polarity and a second polarity with respect to a predetermined potential (this potential may be referred to as a reference potential hereinafter) within the image signal adjustment period. In addition, before the polarity inversion, a predetermined first potential is set when the polarity before the polarity inversion is the first polarity, and a predetermined second potential is set when the polarity before the polarity inversion is the second polarity. Alternatively, after the polarity of the image signal is inverted within the image signal adjustment period, the first potential is used when the polarity after the polarity inversion is the first polarity, and the second potential when the polarity after the polarity inversion is the second polarity. Set to potential. Alternatively, within the image signal adjustment period, the image signal is set to the first potential before polarity inversion, when the polarity before polarity inversion is the first polarity, and to the second potential when the polarity before polarity inversion is the second polarity. After the polarity inversion, the first potential is used when the polarity after polarity inversion is the first polarity, and the second potential is set when the polarity after polarity inversion is the second polarity. Here, the first potential or the second potential is, for example, a predetermined value between the first display potential for displaying the lowest gradation and the second display potential for displaying the highest gradation in each pixel unit. For example, a potential closer to the reference potential among the first display potential and the second display potential is used. Therefore, it is possible to reduce the change in the voltage accompanying the polarity inversion of the image signal as compared with the case where the potential is not adjusted as described above. Note that when the image signal is set to the first potential or the second potential both before and after polarity inversion, the change in the voltage of the image signal can be minimized.

  The scanning line driving circuit ends the supply of the scanning signal to one scanning line within the image signal adjustment period. At this time, if the selection end timing is delayed with respect to the scanning signal supply end timing in a part of the one scanning line, for example, near the center of the image display region, the pixel unit corresponding to a part of the one scanning line Before the selection is completed, there is a possibility that the AC component of the image signal supplied to the corresponding data line through the capacitive coupling of the selection switching element is written in the pixel portion.

  However, as described above, since the change in the voltage of the image signal due to the polarity inversion is small, it is possible to reduce the influence on the display image caused by the malfunctioning display element by writing the AC component of the image signal. Further, by providing the image signal adjustment period as described above, for example, even when each scanning line is scanned at high speed as described in the prior art document 1, the influence on the display image due to the malfunction of the display element is reduced. be able to.

  In one aspect of the electro-optical panel drive circuit of the present invention, the image signal supply circuit performs the polarity inversion after the scanning signal supply period of the one scanning line is completed within the image signal adjustment period.

  According to this aspect, within the image signal adjustment period, the image signal supply circuit adjusts the image signal to the first potential or the second potential before polarity inversion and maintains it until the polarity inversion. Alternatively, in the image signal adjustment period, the image signal supply circuit adjusts the image signal to the first potential or the second potential after polarity inversion. Therefore, in this aspect, the scanning signal supply period of one scanning line is terminated without changing the potential of the image signal. Therefore, even if the selection end timing is delayed with respect to the scanning signal supply end timing in a part of one scanning line, the selection switching element is connected to the corresponding data line in the pixel portion corresponding to the one scanning line. It is possible to prevent the AC component of the image signal supplied via capacitive coupling from being written. Therefore, it is possible to almost eliminate the influence on the display image due to the malfunction of the display element.

  In another aspect of the drive circuit for the electro-optical panel of the present invention, the image signal supply circuit uses the first potential or the second potential as the first display potential for displaying the lowest gradation in the pixel portion. And the second display potential for displaying the highest gradation is adjusted so as to be a potential closer to the predetermined potential, or the first potential or the second potential and the predetermined potential In the meantime, the first display potential or the second display potential is adjusted so as to be closer to the predetermined potential.

  According to this aspect, for example, when displaying in a normally white mode in each pixel unit, the first potential or the second potential is set to the lowest gradation (that is, white) in each pixel unit by the image signal supply circuit. ) Is adjusted to the first display potential for displaying, or adjusted to a potential closer to the reference potential than the second display potential for displaying the highest gradation (ie, black) in each pixel portion. Is preferred. Alternatively, when displaying in the normally black mode in each pixel portion, the first potential or the second potential is adjusted to the second display potential by the image signal supply circuit, or the reference potential is set based on the first display potential. It is preferable to adjust to a potential close to. In this way, the change in the voltage of the image signal accompanying the polarity inversion can be further reduced. In the normally white mode or the normally black mode, the first potential and the second potential are adjusted as described above, and the first potential or the second potential is set before and after the polarity inversion. It is possible to minimize the change in the voltage of the image signal due to the polarity inversion.

  In another aspect of the electro-optical panel drive circuit of the present invention, the image signal supply circuit sets the first potential or the second potential to the predetermined potential.

  According to this aspect, when displaying in the normally white mode or the normally black mode in each pixel unit, it is possible to further reduce the change in the voltage of the image signal due to the polarity inversion. Here, when the first potential and the second potential are set as reference potentials, the scanning signal supply period of one scanning line can be ended without changing the potential of the image signal within the image signal adjustment period. . Accordingly, even if the selection end timing is delayed with respect to the scanning signal supply end timing in a part of one scanning line, the malfunction of the display element in the pixel portion corresponding to a part of the one scanning line is prevented. It is possible to almost eliminate the influence on the display image due to a malfunction.

  In another aspect of the driving circuit for the electro-optical panel of the present invention, the scanning line driving circuit supplies the scanning signal so that the plurality of scanning lines are selected in a line sequential manner.

  According to this aspect, the pixel unit corresponding to each scanning line can be driven with a different polarity for each scanning line, that is, 1H inversion driving can be performed. The “line sequential” in the present invention includes not only selecting each scanning line in the order along the above-mentioned one direction but also selecting each scanning line alternately in a plurality of partial areas.

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

  According to the electro-optical device of the present invention, when the polarity of the image signal is reversed, the influence of the malfunctioning display element on the display image due to the writing of the AC component of the image signal is suppressed, so that high-quality image display is performed. It becomes possible.

  In one aspect of the electro-optical device according to the aspect of the invention, the pixel unit includes a pixel switching element that controls switching of the display element. The display element is provided to face the pixel electrode and the pixel electrode, and has a common potential. The pixel switching element is configured to sandwich the image signal supplied from the data line in response to the scanning signal supplied from the scanning line. While supplying to an electrode, the said display element performs an image display based on the said image signal.

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

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

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

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

  In order to solve the above problems, the electro-optical panel driving method of the present invention is electrically connected to the scanning lines and the data lines, and the scanning lines and the data lines on the substrate, respectively. A driving method for driving an electro-optical panel including a plurality of pixel units each including a display element, wherein one or a plurality of data among the plurality of data lines is selected according to a selection signal that defines an image signal supply period An image signal is supplied to the line, a scanning signal for selecting the plurality of scanning lines is supplied to each of the plurality of scanning lines, and the scanning signal is supplied to the scanning line within a scanning signal supply period. One of the plurality of scanning lines to which the scanning signal is supplied relatively first, and another scanning line to which the scanning signal is supplied relatively later On the time axis, In the image signal adjustment period, which is located after the supply of the selection signal in the scanning signal supply period of the inspection line and is located before the start of the supply of the selection signal in the scanning signal supply period of the other scanning line. The image signal is inverted to a first polarity and a second polarity with respect to a predetermined potential, and the image signal is set to a predetermined first potential in the first polarity within the image signal adjustment period. Is supplied as a predetermined second potential, and the image signal is supplied as a display potential adjusted for each data line during the image signal supply period, and the scanning for the one scanning line is performed within the image signal adjustment period. The signal supply is terminated.

  According to the driving method of the electro-optical panel of the present invention, similarly to the driving circuit of the present invention described above, when the polarity of the image signal is inverted, the AC component of the image signal is written to the display image by the display element malfunctioning. The influence can be reduced. Further, by providing the image signal adjustment period, for example, even when each scanning line is scanned at high speed as described in Prior Art Document 1, it is possible to reduce the influence on the display image due to the malfunction of the display element.

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

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

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

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

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

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

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

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

  In FIG. 2, on the TFT array substrate 10, an alignment film is formed on the pixel electrode 9a after the pixel switching TFT, the scanning line, the data line and the like are formed. On the other hand, on the counter substrate 20, in addition to the counter electrode 21, a lattice-shaped or striped light-shielding film 23 and an alignment film are formed on the uppermost layer portion. Further, the liquid crystal layer 50 is made of, for example, a liquid crystal in which one or several types of nematic liquid crystals are mixed, and takes a predetermined alignment state between the pair of alignment films.

  Although not shown in FIGS. 1 and 2, on the TFT array substrate 10, in addition to the data line driving circuit 101 and the scanning line driving circuit 104, an image signal on the image signal line is sampled as will be described later. A sampling circuit for supplying data lines is formed. In this embodiment, in addition to the sampling circuit, a precharge circuit that supplies a precharge signal of a predetermined voltage level to a plurality of data lines in advance of the image signal, the quality and defects of the electro-optical device during manufacturing or at the time of shipment An inspection circuit for inspecting etc. may be formed.

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

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

  The timing control circuit 400 is configured to output various timing signals used in each unit. A timing signal output means that is a part of the timing control circuit 400 generates a dot clock that is a minimum unit clock and scans each pixel. Based on this dot clock, a Y clock signal CLY and an inverted Y clock signal are generated. CLYinv, X clock signal CLX, inverted X clock signal XCLinv, Y start pulse DY and X start pulse DX are generated.

  One line of input image data VID is input to the image signal supply circuit 300 from the outside. The image signal supply circuit 300 serial-parallel converts one system of input image data VID to generate N-phase, in this embodiment, six-phase (N = 6) image signals VID1 to VID6. Further, the image signal supply circuit 300 inverts each voltage of the image signals VID1 to VID6 to “negative polarity” as “first polarity” and positive polarity as “second polarity” with respect to a predetermined reference potential v0, Image signals VID1 to VID6 are output.

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

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

  As shown in FIG. 4, the liquid crystal panel 100 includes a scanning line driving circuit 104, a data line driving circuit 101 corresponding to the “selection signal supply circuit” according to the present invention, and sampling in the peripheral region of the TFT array substrate 10. An internal drive circuit including circuit 200 is provided.

  The scanning line driving circuit 104 is supplied with a Y clock signal CLY, an inverted Y clock signal CLYinv, and a Y start pulse DY. When the Y start pulse DY is input, the scanning line driving circuit 104 sequentially generates and outputs the scanning signals Y1,..., Ym at a timing based on the Y clock signal CLY and the inverted Y clock signal CLYinv.

  The data line driving circuit 101 is supplied with an X clock signal CLX, an inverted X clock signal CLXinv, and an X start pulse DX. When the X start pulse DX is input, the data line driving circuit 101 receives sampling signals S1,..., Sn as “selection signals” according to the present invention at a timing based on the X clock signal CLX and the inverted X clock signal XCLXinv. Are generated and output sequentially.

  The sampling circuit 200 includes a plurality of sampling switches 202 each composed of a P-channel or N-channel single-channel TFT or a complementary TFT as “selection switching elements” according to the present invention.

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

  Image signals VID <b> 1 to VID <b> 6 that are serially / parallel-developed in six phases are supplied to the liquid crystal panel 100 via image signal lines 171. Further, as shown in FIG. 4, in the sampling circuit 200, N sampling switches 202 in this embodiment are grouped into one group, and the sampling signal 202 belonging to the group is respectively sampled from the data line driving circuit 101 by a sampling signal. Si (i = 1, 2,..., N) is input. The sampling switch 202 belonging to one group includes N data lines, in this embodiment, six data lines 114 as one group, and the data lines 114 belonging to the first group are serially parallel to six phases according to the sampling signal Si. The developed image signals VID1 to VID6 are sampled and supplied. That is, the data lines 114 belonging to the first group and the six image signal lines 171 are electrically connected via the sampling switch 202 belonging to the first group. Therefore, in this embodiment, since the n data lines 114 are driven for each data line 114 belonging to one group, the driving frequency can be suppressed.

  In FIG. 4, focusing on the configuration of one pixel portion 70, the data line 114 to which the image signal VIDk (where k = 1, 2, 3,..., 6) is supplied to the source electrode of the TFT 116. Is electrically connected to the gate electrode of the TFT 116, and a scanning line 112 to which a scanning signal Yj (j = 1, 2, 3,..., M) is supplied is electrically connected. In addition, the pixel electrode 9 a of the liquid crystal element 118 is connected to the drain electrode of the TFT 116. Here, in each pixel portion 70, the liquid crystal element 118 has a liquid crystal sandwiched between the pixel electrode 9 a and the counter electrode 21. Accordingly, each pixel unit 70 is arranged in a matrix corresponding to each intersection of the scanning line 112 and the data line 114.

  Each scanning line 112 is selected line-sequentially by the scanning signals Y1,..., Ym output from the scanning line driving circuit 104. In the pixel unit 70 corresponding to the selected scanning line 112, when the scanning signal Yj is supplied to the TFT 116 during the scanning signal supply period in the scanning line 112, the TFT 116 is turned on, and the pixel unit 70 is in the selected state. Become. An image signal VIDk is supplied to the pixel electrode 9a of the liquid crystal element 118 from the data line 114 at a predetermined timing by closing the switch of the TFT 116 for a certain period. As a result, an applied voltage defined by the potentials of the pixel electrode 9 a and the counter electrode 21 is applied to the liquid crystal element 118. The liquid crystal modulates light and enables gradation display by changing the orientation and order of the molecular assembly depending on the applied voltage level. In the normally white mode, the transmittance for incident light is reduced according to the voltage applied in units of each pixel, and in the normally black mode, the light is incident according to the voltage applied in units of each pixel. The light transmittance is increased, and light having a contrast corresponding to the image signals VID1 to VID6 is emitted from the liquid crystal panel 100 as a whole.

  Here, a storage capacitor 119 is added in parallel with the liquid crystal element 118 in order to prevent the held image signal from leaking. For example, the voltage of the pixel electrode 9a is held by the storage capacitor 119 for a time that is three orders of magnitude longer than the time when the source voltage is applied, so that the holding characteristics are improved, and as a result, a high contrast ratio is realized. Become.

<1-3: Operation of electro-optical device>
Next, the operation of the liquid crystal device will be described with reference to FIG. 5 in addition to FIGS. FIG. 5 is a timing chart showing changes with time of various signals related to the operation of the liquid crystal device.

  The plurality of scanning lines 112 are arranged along the vertical direction in the image display region 10a in FIG. In the present embodiment, the plurality of scanning lines 112 are selected in the order along the arrangement direction in FIG. 4, and the normally white mode display is performed by the liquid crystal element 118 in each pixel unit 70. To do. In FIG. 5, the second display potential of the image signal VIDk for displaying black by the liquid crystal element 118 will be described as vb (+) for positive polarity and vb (−) for negative polarity.

  In the following description, the pixel unit 70 corresponding to the (j−2) th, (j−1) th, and jth selected scanning lines 112 will be particularly described.

  Here, the scanning signal supply period of each scanning line 112 corresponds to a period in which the scanning signal Yj is output from the scanning line driving circuit 104. The selection period of each scanning line 112 is defined by the Y clock signal CLY and the inverted Y clock signal CLYinv. In FIG. 5, when the Y clock signal CLY rises from the low level to the high level at the time t1, the supply of the scanning signal Yj-2 from the scanning line driving circuit 104 is completed, and at the same time, the scanning signal Yj-1 is changed to the scanning line driving circuit. 104. Accordingly, the scanning signal supply period of the (j−2) th scanning line 112 ends, the scanning signal supply period of the (j−1) th scanning line 112 starts, and the (j−1) th scanning line 112 starts. Scanning line 112 is selected.

  On the other hand, the image signal supply circuit 300 performs data in the scanning signal supply period of the (j−1) th scanning line 112 after the time t1 from the time t0 positioned before the time t1 on the time axis. A period from time t2 positioned before time t3 when supply of the sampling signal Si from the line driving circuit 101 is started (in short, a period from time t0 to time t2 in FIG. 5) is defined as an image signal adjustment period. .

  In a period from time t0 to time t3 (corresponding to a so-called horizontal blanking period), the sampling signal Si is at a low level, and the sampling switch 202 is in an off state. Therefore, the image signal VIDk is not supplied on the data line 114.

  As shown in FIG. 5, before the time t0, the image signal VIDk becomes the second display potential vb (−) on the negative polarity side. At time t0, the image signal supply circuit 300 uses the image signal VIDk as the first potential from the second display potential vb (−) as the first potential, and the first display potential vw on the negative polarity side for displaying white by the display element 118. Adjust to (-). After that, at time t1 when the supply of the scanning signal Yj-2 is finished, the potential of the image signal VIDk is inverted from negative polarity to positive polarity, and is then used as the second potential as the first display potential vw ( Adjust to +). Therefore, the change in the voltage accompanying the polarity inversion of the image signal VIDk is defined by the first display potentials vw (−) and vw (+) on the negative polarity side and the positive polarity side, for example, about 2 [V]. It is possible to make the value of. That is, it is possible to reduce a change in voltage due to the polarity inversion of the image signal VIDk.

  Here, a part of the (j−2) th scanning line 112 located near the center of the image display area 10a, for example, with respect to the supply end timing of the scanning signal Yj−2 due to wiring resistance or wiring capacitance. Selection end timing may be delayed. Thus, when the selection end timing is delayed, as described above, the pixel unit 70 corresponding to the data line 114 belonging to the first group, for which the supply of the image signal VIDk has already been completed, is the (j−2) th scan. Before the selection of the pixel unit 70 corresponding to a part of the line 112 is completed, the image signal VIDk supplied to the liquid crystal element 118 in the pixel unit 70 via the capacitive coupling of the sampling switch 202 to the corresponding data line 114 is displayed. AC component may be written. However, as described above, since the change in the voltage of the image signal VIDk due to the polarity inversion is small, the influence of the malfunctioning liquid crystal element 118 on the display image can be reduced by writing the AC component of the image signal VIDk. .

  The image signal supply circuit 300 changes the image signal VIDk from the first display potential vw (+) on the positive polarity side to the second display potential vb (+) on the positive polarity side at the same time as the image signal adjustment period at time t2. Exit.

  Subsequently, the (j−1) th scanning line 112 is selected during a period from time t1 to time t6 when the Y clock signal CLY is at a high level, and the (j−1) th scanning line 112 is connected to the (j−1) th scanning line 112. The corresponding pixel unit 70 is selected.

  After the image signal adjustment period ends at time t2, the sampling signal Si is output from the data line driving circuit 101 and supplied to the sampling switch 202 at time t3. Then, during a period from time t3 to time t4 when the sampling signal Si is supplied, the sampling switch 202 is sequentially turned on in accordance with the output of the sampling signal Si that is a shift register output. At this time, since parallel-serial development is adopted, the sampling switches 202 connected to the same sampling signal Si are collectively turned on. In the present embodiment, in particular, in one continuous image signal supply period (for example, the period from time t3 to t4 in FIG. 5), the sampling signals S1,..., Corresponding to the image signal VIDk for one line. Sn is output. Further, in another continuous image signal supply period (for example, the period from time t8 to t9 in FIG. 5), the sampling signal S1,..., Corresponding to the image signal VIDk for another line. Sn is output. In any case, only during the image signal supply period, the image signal is sampled and the image signal VIDk is supplied to the data line 114.

  The image signal supply circuit 300 adjusts the image signal VIDk to the display potential va (+) on the positive polarity side for each data line 114 during the period from time t3 to t4. As a result, the image signal VIDk is output from the image signal supply circuit 300 as a display voltage defined by the predetermined reference potential v0 and the display potential va (+) for each data line. Then, the image signal VIDk is supplied to the corresponding data line 114 via the sampling switch 202 in the on state. The image signal VIDk is supplied to each of the pixel units 70 corresponding to the data lines 114 thus driven and corresponding to the (j−1) th scanning line 112. As described above, the image signal VIDk corresponding to the image data to be actually displayed is supplied via the sampling switch 202 and the data line 114 during the period from the time t3 to the time t4.

  When the supply of the sampling signal Si ends at time t4 and the image signal supply period ends, the image signal supply circuit 300 changes the image signal VIDk from the display potential va (+) to the second display potential vb on the positive polarity side. Adjust to (+). Thereafter, the selection of the pixel unit 70 corresponding to the (j−1) th scanning line 112 is completed at time t6. When the Y clock signal CLY falls from the high level to the low level at time t6, the scanning signal Yj is output from the scanning line driving circuit 104, and the scanning signal supply period of the jth scanning line 112 is started. The jth scan line 112 is selected.

  Here, the image signal supply circuit 300 is after the time t4 after the time t4 when the supply of the sampling signal Si ends and before the time t6 when the supply of the scanning signal Yj-1 ends. Thus, a period from time t8 before time t8 when supply of the sampling signal Si from the data line driving circuit 101 is started in the selection period of the j-th scanning line 112 (in short, time t5 to time in FIG. 5). The period until t7) is defined as an image signal adjustment period.

  Similar to the image signal adjustment period from time t0 to time t2, the image signal supply circuit 300 inverts the polarity of the image signal VIDk and adjusts its potential. More specifically, at time t5, the image signal VIDk is adjusted from the second display potential vb (+) on the positive polarity side to the first display potential vw (+) on the positive polarity side. Thereafter, at time t6 when the supply of the scanning signal Yj-1 is finished, the potential of the image signal VIDk is inverted from positive polarity to negative polarity, and then adjusted to the first display potential vw (−) on the negative polarity side. . Subsequently, at time t7, the image signal supply circuit 300 changes the image signal VIDk from the first display potential vw (−) on the negative polarity side to the second display potential vb (−) on the negative polarity side at the same time. The signal adjustment period ends.

  Subsequently, the j-th scanning line 112 is selected during a period from time t6 to time t11 when the Y clock signal CLY is at a low level, and the pixel unit 70 corresponding to the j-th scanning line 112 is selected. The

  During the period from time t8 to time t9, the image signal VIDk is received from the corresponding data line 114 via the sampling switch 202 in the on state to the pixel unit 70 corresponding to the (j−1) th scanning line 112. Supplied. Note that during the period from time t8 to time t9, the image signal supply circuit 300 adjusts the image signal VIDk to the display potential va (−) on the negative polarity side for each data line 114. Thereafter, at time t10, the image signal supply circuit 300 starts the image signal adjustment period again.

  As described above, similarly to the (j−2) th scanning line 112, the (j−1) th and jth scanning lines 112 also have a pixel portion corresponding to a part of which the selection end timing is delayed. The influence on the display image due to the malfunction of the liquid crystal element 118 in 70 can be reduced. Further, by providing the image signal adjustment period as described above, for example, even when each scanning line 112 is scanned at high speed, the influence on the display image due to the malfunction of the liquid crystal element 118 can be reduced. Therefore, in the present embodiment, high-quality image display can be performed on the liquid crystal panel 100.

  Here, in the present embodiment, the image signal supply circuit 300 outputs the image signal VIDk to the second display potentials vb (+) and vb (−) both before and after polarity inversion within the image signal adjustment period. ) To the first display potentials vw (+) and vw (−) that are closer to the reference potential v0. Therefore, the change in the voltage of the image signal VIDk accompanying the polarity inversion can be minimized. Note that the image signal supply circuit 300 adjusts the image signal VIDk as the first potential so that the image signal VIDk is closer to the reference potential v0 than the second display potential vb (−) on the negative polarity side. Alternatively, the second display potential vb (+) on the positive polarity side may be adjusted so as to be a potential closer to the reference potential v0.

  In addition, as described above, the present invention is not limited to the case where the n data lines 114 are driven for each data line 114 belonging to one group, and may be driven for each data line 114. Alternatively, each of the n data lines 114 may be one of three types for red (R), green (G), and blue (B), and 3 for R, G, and B. One type of data line may be regarded as one group, and each data line 114 belonging to one group may be driven. In the latter case, the image signal supply circuit 300 generates and supplies image signals as R, G, and B signals corresponding to RGB colors based on the input image data VID.

<1-4;Modification>
A modification of the present embodiment described above will be described with reference to FIGS. FIGS. 6 and 7 are timing charts for explaining the operation of the liquid crystal device according to one modified example. FIGS. 8 and 9 are operations of the liquid crystal device according to another modified example, respectively. It is a figure which shows the timing chart for demonstrating.

  The image signal supply circuit 300 may set the potential of the image signal VIDk to the first potential on the negative polarity side and the second potential on the positive polarity side before or after polarity inversion within the image signal adjustment period. Good.

  In FIG. 6, the image signal supply circuit 300 adjusts the image signal VIDk as the first potential to the first display potential vw (−) on the negative polarity side at time t0. Thereafter, at time t1 when the supply of the scanning signal Yj-2 is finished, the potential of the image signal VIDk is inverted from the negative polarity to the positive polarity and then adjusted to the second display potential vb (+) on the positive polarity side. . Further, the image signal supply circuit 300 adjusts the image signal VIDk from the second display potential vb (+) on the positive polarity side to the first display potential vw (+) on the positive polarity side as the second potential at time t5. To do. After that, at time t6 when the supply of the scanning signal Yj-1 is finished, the potential of the image signal VIDk is inverted from positive polarity to negative polarity and then adjusted to the second display potential vb (−) on the negative polarity side. .

  Alternatively, as shown in FIG. 7, the image signal supply circuit 300 inverts the potential of the image signal VIDk from negative polarity to positive polarity at time t1, and then the second display potential vb (−) on the negative polarity side. To the first display potential vw (+) on the positive polarity side. Further, the image signal supply circuit 300 inverts the potential of the image signal VIDk from positive polarity to negative polarity at time t6, and then from the second display potential vb (+) on the positive polarity side to the first polarity on the negative polarity side. The display potential is adjusted to vw (−).

  Therefore, the change in the voltage accompanying the polarity inversion of the image signal VIDk can be reduced as compared with the case where the potential is not adjusted before or after the polarity inversion as described above. That is, even in this way, the benefits of the present embodiment can be fully enjoyed.

  Alternatively, the image signal supply circuit 300 may invert the polarity of the image signal VIDk after the end of the scanning signal supply period within the image signal adjustment period. In FIG. 8, the image signal supply circuit 300 receives the image signal VIDk at time t22 after time t1 when the supply of the scanning signal Yj-2 ends and before time t2 when the image signal adjustment period ends. The potential is reversed from negative polarity to positive polarity. Further, the image signal supply circuit 300 applies the potential of the image signal VIDk after time t6 when the supply of the scanning signal Yj-1 ends and before time t7 when the image signal adjustment period ends. Invert from positive polarity to negative polarity. This makes it possible to end the scanning signal supply period of each scanning line 112 without changing the potential of the image signal VIDk. Therefore, in each scanning line 112, the pixel unit 70 corresponding to a part of which the selection end timing is delayed with respect to the supply end timing of the scanning signal Yj is supplied to the corresponding data line 114 through the capacitive coupling of the sampling switch 202. It is possible to prevent the AC component of the image signal VIDk from being written. Therefore, it is possible to almost eliminate the influence on the display image due to the malfunction of the liquid crystal element 118. Therefore, it is possible to display a higher quality image on the liquid crystal panel 100.

  In addition, the image signal supply circuit 300 may set the image signal VIDk to the reference potential v0 as the first potential or the second potential before the polarity inversion or after the polarity inversion within the image signal adjustment period. As shown in FIG. 9, the image signal supply circuit 300 adjusts the image signal VIDk from the second display potential vb (−) on the negative polarity side to the reference potential v0 at time t0. Then, during the period from time t0 to time t2, the image signal VIDk is maintained at the reference potential v0. Further, the image signal supply circuit 300 adjusts the image signal VIDk from the second display potential vb (+) on the positive polarity side to the reference potential v0 at time t5. Then, during the period from time t5 to time t7, the image signal VIDk is maintained at the reference potential v0. In this way, the scanning signal supply period of each scanning line 112 can be ended without changing the potential of the image signal VIDk within the image signal adjustment period. Therefore, even if the selection end timing is delayed with respect to the supply end timing of the scanning signal Yj in a part of each scanning line 112, the malfunction of the liquid crystal element 118 in the pixel unit 70 corresponding to the part is prevented. It is possible to almost eliminate the influence on the display image due to the malfunction. In the case described with reference to FIG. 6 or FIG. 7, the image signal VIDk may be set to the reference potential v0 before or after polarity inversion. In this case, the change in the voltage of the image signal VIDk accompanying the polarity inversion can be further reduced.

  In the present embodiment, normally black mode display may be performed by the liquid crystal element 118 in each pixel unit 70. In this case, the first potential or the second potential is preferably adjusted to the second display potential by the image signal supply circuit 300, or is adjusted to a potential closer to the reference potential v0 than the first display potential. .

<2; Electronic equipment>
Next, a case where the above-described liquid crystal device is applied to various electronic devices will be described.

<2-1: Projector>
First, a projector using this liquid crystal device as a light valve will be described. FIG. 10 is a plan layout diagram illustrating a configuration example of a projector. As shown in this figure, a lamp unit 1102 including a white light source such as a halogen lamp is provided inside the projector 1100. The projection light emitted from the lamp unit 1102 is separated into three primary colors of RGB by four mirrors 1106 and two dichroic mirrors 1108 arranged in the light guide 1104, and light valves 1110R corresponding to the respective primary colors. Incident on 1110B and 1110G. These three light valves 1110R, 1110B, and 1110G are each configured using a liquid crystal module including a liquid crystal device.

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

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

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

<2-2: Mobile computer>
Next, an example in which the liquid crystal device is applied to a mobile personal computer will be described. FIG. 11 is a perspective view showing the configuration of the personal computer. In the figure, a computer 1200 includes a main body 1204 having a keyboard 1202 and a liquid crystal display unit 1206. The liquid crystal display unit 1206 is configured by adding a backlight to the back surface of the liquid crystal device 1005 described above.

<2-3; Mobile phone>
Further, an example in which the liquid crystal device is applied to a mobile phone will be described. FIG. 12 is a perspective view showing the configuration of this mobile phone. In the figure, a mobile phone 1300 includes a reflective liquid crystal device 1005 together with a plurality of operation buttons 1302. In the reflective liquid crystal device 1005, a front light is provided on the front surface thereof as necessary.

  In addition to the electronic devices described with reference to FIGS. 10 to 12, a liquid crystal television, a viewfinder type, a monitor direct-view type video tape recorder, a car navigation device, a pager, an electronic notebook, a calculator, a word processor, a work Examples include a station, a videophone, a POS terminal, a device equipped with a touch panel, and the like. Needless to say, the present invention can be applied to these various electronic devices.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification. The driving circuit and method, the electro-optical device including the electro-optical panel and the driving circuit, and the electronic apparatus including the electro-optical device are also included in the technical scope of the present invention.

It is a top view which shows the whole structure of a liquid crystal panel. It is H-H 'sectional drawing of FIG. It is a block diagram which shows the whole structure of a liquid crystal device. It is a block diagram which shows the electrical structure of a liquid crystal panel. It is a timing chart which shows change with time of various signals concerning operation of a liquid crystal device. It is a figure which shows the timing chart for demonstrating one operation | movement of the liquid crystal device which concerns on this modification. It is a figure which shows the timing chart for demonstrating one operation | movement of the liquid crystal device which concerns on this modification. It is a figure which shows the timing chart for demonstrating other operation | movement of the liquid crystal device which concerns on this modification. It is a figure which shows the timing chart for demonstrating other operation | movement of the liquid crystal device which concerns on this modification. It is a top view which shows the structure of the projector which is an example of the electronic device to which a liquid crystal device is applied. It is a perspective view which shows the structure of the personal computer which is an example of the electronic device to which the liquid crystal device is applied. It is a perspective view which shows the structure of the mobile telephone which is an example of the electronic device to which a liquid crystal device is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 9a ... Pixel electrode, 10a ... Image display area, 10 ... TFT array substrate, 20 ... Counter substrate, 21 ... Counter electrode, 70 ... Pixel part, 100 ... Liquid crystal panel, 101 ... Data line drive circuit, 104 ... Scan line drive circuit , 112 ... scanning lines, 114 ... data lines, 118 ... liquid crystal elements, 200 ... sampling circuits, 202 ... sampling switches, 300 ... image signal supply circuits

Claims (9)

An electro-optical panel including a plurality of scanning lines and a plurality of data lines, and a plurality of pixel portions that are electrically connected to the scanning lines and the data lines and each include a display element is driven on a substrate. A drive circuit for
A plurality of selection switching elements that respectively supply image signals to the data lines in accordance with a selection signal that defines an image signal supply period;
A scanning line driving circuit for supplying a scanning signal for selecting the plurality of scanning lines to each of the plurality of scanning lines;
A selection signal for supplying the selection signal to the selection switching element corresponding to one or a plurality of data lines among the plurality of data lines within a scanning signal supply period in which the scanning signal is supplied to the scanning lines. A supply circuit;
Among the plurality of scanning lines, the one scanning line to which the scanning signal is supplied relatively earlier and the other scanning line to which the scanning signal is supplied relatively later, on the time axis, In an image signal adjustment period that is located after the supply of the selection signal in the scanning signal supply period of one scanning line and that is located before the start of the supply of the selection signal in the scanning signal supply period of the other scanning line The image signal is inverted between a first polarity and a second polarity with respect to a predetermined potential, and the image signal is set to a predetermined first potential in the first polarity within the image adjustment period. The polarity is supplied to each selection switching element as a predetermined second potential, and the image signal is supplied to each selection switching element as a display potential adjusted for each data line during the image signal supply period. And an image signal supply circuit for supplying,
The scanning line driving circuit ends the supply of the scanning signal to the one scanning line within the image signal adjustment period. 2. The electro-optical panel drive according to claim 1, wherein the image signal supply circuit performs the polarity inversion after a scanning signal supply period of the one scanning line is completed within the image signal adjustment period. circuit. The image signal supply circuit uses the first potential or the second potential as a first display potential for displaying the lowest gradation and a second display potential for displaying the highest gradation in the pixel portion. Of these, the first potential or the second potential is adjusted between the first potential or the second potential and the predetermined potential so that the potential is closer to the predetermined potential. The drive circuit for an electro-optical panel according to claim 1, wherein the driving circuit is also adjusted to be a potential close to the predetermined potential. The electro-optical panel drive circuit according to claim 1, wherein the image signal supply circuit sets the first potential or the second potential to the predetermined potential. 5. The electro-optical panel according to claim 1, wherein the scanning line driving circuit supplies the scanning signal so that the plurality of scanning lines are selected in a line sequential manner. 6. Driving circuit.   An electro-optical device comprising the drive circuit for the electric panel according to any one of claims 1 to 5 and the electro-optical panel. The pixel unit includes a pixel switching element that controls the display element.
The display element is provided opposite to the pixel electrode and the pixel electrode, and an electro-optical material is sandwiched between the counter electrodes having a common potential.
The pixel switching element supplies the image signal supplied from the data line to the pixel electrode in response to the scan signal supplied from the scan line,
The electro-optical device according to claim 6, wherein the display element displays an image based on the image signal.   An electronic apparatus comprising the electro-optical device according to claim 6. An electro-optical panel including a plurality of scanning lines and a plurality of data lines, and a plurality of pixel portions that are electrically connected to the scanning lines and the data lines and each include a display element is driven on a substrate. A driving method for
Supplying an image signal to one or a plurality of data lines among the plurality of data lines according to a selection signal defining an image signal supply period;
Supplying a scanning signal for selecting the plurality of scanning lines to each of the plurality of scanning lines;
Supplying the selection signal within a scanning signal supply period in which the scanning signal is supplied to the scanning line;
Among the plurality of scanning lines, the one scanning line to which the scanning signal is supplied relatively earlier and the other scanning line to which the scanning signal is supplied relatively later, on the time axis, Within an image signal adjustment period that is located after the supply of the selection signal in the scanning signal supply period of one scanning line and is located before the start of the supply of the selection signal in the scanning signal supply period of the other scanning line The image signal is inverted to a first polarity and a second polarity with respect to a predetermined potential, and the image signal is set to a predetermined first potential in the first polarity within the image signal adjustment period. In the two polarity, as a predetermined second potential is supplied, the image signal is supplied as a display potential adjusted for each data line during the image signal supply period,
A method of driving an electro-optical panel, wherein the supply of the scanning signal to the one scanning line is terminated within the image signal adjustment period.

Images