JP2006184653A - Electro-optical device, drive circuit and method therefor, and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electro-optical device permitting to reduce a circuit scale of a driving circuit, by suppressing withstand voltage required therefor, and to provide a circuit and method for driving the same, and electronic equipment. <P>SOLUTION: Pixels P are arranged at the intersections of scanning lines 11 and data lines 13. A voltage generation circuit 41 generates a selection voltage VSH of the positive polarity, a selection voltage VSL of the negative polarity, and non-selection voltages (VDH and NDL). A voltage selection circuit 43 alternately selects a 1st voltage group, including the selection voltage VSH and the non-selection voltages and a 2nd voltage group, including the selection voltage and the non-selection voltages. A scanning line driving circuit 31 sequentially applies selection voltage of a voltage group, that is selected by the voltage selection circuit 43, to each scanning line 11 and also applies the non-selection voltages of the voltage group to the unselected scanning lines 11. A data line drive circuit 33 supplies a data signal Xj to each data line 13, according to a gradation of a pixel P corresponding to the intersection of a scanning line 11 and the data line selected by the scanning line drive circuit 31. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for controlling optical characteristics of an electro-optical material such as a liquid crystal.

In particular, it is known that an electro-optical material such as a liquid crystal deteriorates its optical characteristics when a DC component of voltage is continuously applied. In order to suppress such deterioration, AC driving is required. AC driving is a method in which a positive voltage and a negative voltage are alternately switched with a predetermined voltage as a reference and applied to each pixel from a driving circuit. For example, Patent Document 1 discloses a configuration in which a positive selection voltage and a negative selection voltage are alternately switched every horizontal scanning period and applied to each scanning line from a scanning line driving circuit.
JP 2002-366120 A (paragraph 0032 and FIG. 7)

By the way, the drive circuit of the electro-optical device adopting the AC drive needs to process a signal in a range from a positive selection voltage to a negative selection voltage, so that the polarity of the voltage applied to the pixel is inverted. It must be durable against higher voltages compared to non-electro-optical devices. In order to sufficiently secure the durability of the drive circuit against voltage (hereinafter referred to as “withstand voltage”), it is necessary to increase the size of various elements such as transistors and diodes constituting the drive circuit. The scale of the circuit must be increased.
Such enlargement of the circuit scale causes various problems such as an increase in manufacturing cost of the drive circuit and obstructing downsizing of the apparatus. In view of such circumstances, an object of the present invention is to solve the problem of reduction in pressure resistance required for a drive circuit.

In order to solve this problem, an electro-optical device according to the present invention includes a pixel disposed corresponding to each intersection of a plurality of scanning lines and a plurality of data lines, and a positive polarity and a negative polarity with respect to a reference voltage. Generating a selection voltage and a non-selection voltage whose absolute value with respect to the reference voltage is lower than each selection voltage, a first voltage group including a positive selection voltage and a non-selection voltage, and a negative polarity A voltage selection circuit that alternately selects the second voltage group including the selection voltage and the non-selection voltage, and a selection voltage of the voltage group selected by the voltage selection circuit is sequentially applied to each of the plurality of scanning lines and is not selected. A scanning line driving circuit that applies a non-selection voltage of the voltage group to each scanning line, and for each of a plurality of data lines, the scanning line driving circuit applies a selection voltage to the intersection of the scanning line and the data line Provides a data signal according to the gradation of the target pixel. It is characterized by comprising a data line drive circuit that. The electro-optical device according to the present invention is typically employed in various electronic devices as a device for displaying an image. Examples of the electronic device include a mobile phone and a personal computer.
In this configuration, the first voltage group including the positive selection voltage and the non-selection voltage and the second voltage group including the negative selection voltage and the non-selection voltage are alternately selected to drive the scanning line. This is used for selecting a scanning line by a circuit. Therefore, the scanning line driving circuit only needs to have a withstand voltage against a large voltage between the difference value between the positive selection voltage and the non-selection voltage and the difference value between the negative selection voltage and the non-selection voltage. The withstand voltage to the voltage corresponding to the difference value between the selected voltage and the negative selected voltage is not required. Therefore, according to the present invention, compared with the conventional electro-optical device in which the voltage resistance to the voltage corresponding to the difference value between the positive selection voltage and the negative selection voltage is essential, the scanning line driving circuit The required pressure resistance can be suppressed and the circuit scale can be reduced.

As a method for inverting the polarity of the voltage applied to each pixel, a method in which the polarities of the voltages applied to the pixels in each column are opposite to each other (so-called column inversion method), or a scanning line and a data line are extended. In addition to the method of reversing the polarity of the voltage at each pixel adjacent in the direction (so-called dot inversion method), the method of reversing the polarity of the voltage of each pixel for every one or more rows (so-called line inversion method) is known. It has been. The electro-optical device adopting the line inversion method according to the present invention includes a pixel arranged corresponding to each intersection of a plurality of scanning lines and a plurality of data lines, and a selection voltage having a positive polarity and a negative polarity with respect to a reference voltage. And a first voltage group (for example, the voltage group in FIG. 3) including a voltage generation circuit that generates a non-selection voltage whose absolute value with respect to the reference voltage is lower than each selection voltage, and a positive selection voltage and a non-selection voltage. L1) is selected in a first period (for example, frames F1 and F3 in FIG. 3), and a second voltage group (for example, voltage group L in FIG. 3) including a negative selection voltage and a non-selection voltage is selected.
2) a first voltage selection circuit (for example, voltage selection circuit 43a in FIG. 1) that selects a second period (for example, frame F2 in FIG. 3) different from the first period, and a second voltage group A second voltage selection circuit (for example, FIG. 1) that selects in the first period and selects the first voltage group in the second period.
The voltage selection circuit 43b) and the selection voltage of the voltage group selected by the first voltage selection circuit are sequentially applied to each of the scanning lines belonging to the first group (for example, the odd-numbered scanning lines) among the plurality of scanning lines. A first scanning line driving circuit (for example, scanning line driving circuit 31a in FIG. 1) that applies and applies a non-selection voltage of the voltage group to a non-selected scanning line among the scanning lines belonging to the first group; And sequentially applying a selection voltage of the voltage group selected by the voltage selection circuit to each of the scanning lines belonging to the second group different from the first group among the plurality of scanning lines (for example, the scanning lines in the even-numbered columns). A second scanning line driving circuit (for example, the scanning line driving circuit 31b in FIG. 1) that applies a non-selection voltage of the voltage group to a non-selected scanning line among the scanning lines belonging to the second group, and each of the plurality of data lines On the other hand, the first or second scanning line driving circuit applies a selection voltage. It includes a data line driving circuit for supplying a data signal corresponding to the gray scale of a pixel corresponding to intersections of scanning lines and the data lines. For example, the scanning lines belonging to one of the odd and even rows among the plurality of scanning lines are divided into the first group, and the scanning lines belonging to the other of the odd and even rows among the plurality of scanning lines are divided into the second group. In this case, the polarity of the voltage is inverted every row.
In this configuration, the polarity of the voltage is inverted between each pixel corresponding to the first group of scanning lines and each pixel corresponding to the second group of scanning lines. On the other hand, in each of the first and second scanning line driving circuits, a first voltage group including a positive selection voltage and a non-selection voltage and a second voltage including a negative selection voltage and a non-selection voltage. Only one of the voltage groups is used. Therefore, according to the present invention, there is an effect that both the first and second scanning line driving circuits suppress the withstand voltage and reduce the circuit scale.

In the present invention, a method (so-called frame inversion method) in which the polarity of the voltage of each pixel is inverted every frame (vertical scanning period) in which each of the plurality of scanning lines is selected once is also adopted. In this configuration, each of the first and second voltage selection circuits alternately selects the first voltage group and the second voltage group for each frame. That is, one frame corresponds to the first period, and the immediately following frame corresponds to the second period. According to this aspect, application of a direct current component to the electro-optic material can be sufficiently suppressed.

By the way, as a non-linear element for controlling a voltage applied to a pixel, a two-terminal type non-linear element (for example, a TFD element) and a three-terminal type non-linear element are known. Among these, the two-terminal type non-linear element tends to have a higher voltage as a threshold necessary for switching from one of the on-state and the off-state to the other than the three-terminal type non-linear element.
Therefore, the drive circuit of the electro-optical device using the two-terminal type non-linear element needs higher pressure resistance than the configuration using the three-terminal type non-linear element. In view of this situation, the effect of the present invention of suppressing the withstand voltage of the drive circuit is particularly remarkable in an electro-optical device in which one of the scanning line and the data line is connected to the pixel via a two-terminal nonlinear element. Become.

In a preferred embodiment of the present invention, the voltage generation circuit includes a positive polarity and a negative polarity selection voltage,
A positive and negative non-selection voltage is generated with respect to a reference voltage, and the first voltage group includes a positive selection voltage and a positive and negative non-selection voltage, and a second voltage group Includes a negative selection voltage and positive and negative non-selection voltages, and each of the first and second scanning line driving circuits applies the selection voltage to each scanning line after applying the selection voltage to each scanning line. A non-selection voltage having the same polarity as the selection voltage is applied. According to this aspect, the application of the DC component of the voltage is suppressed even for non-selected scanning lines.

On the other hand, the drive circuit according to the present invention includes a voltage generation circuit that generates positive and negative selection voltages with respect to a reference voltage, and a non-selection voltage whose absolute value with respect to the reference voltage is lower than each selection voltage, and a positive electrode A voltage selection circuit that alternately selects a first voltage group including a positive selection voltage and a non-selection voltage and a second voltage group including a negative selection voltage and a non-selection voltage, and the voltage selection circuit selects A scanning line driving circuit that sequentially applies a selection voltage of a voltage group to each of a plurality of scanning lines and applies a non-selection voltage of the voltage group to an unselected scanning line, and scans each of the plurality of data lines The line driving circuit includes a data line driving circuit that supplies a data signal corresponding to the gray level of the pixel corresponding to the intersection of the scanning line to which the selection voltage is applied and the data line. A driving circuit according to a more specific aspect includes a pixel arranged corresponding to each intersection of a plurality of scanning lines and a plurality of data lines, a selection voltage having a positive polarity and a negative polarity with respect to a reference voltage, and the reference A voltage generation circuit that generates a positive polarity and a negative polarity non-selection voltage whose absolute value with respect to the voltage is lower than each selection voltage; and a first that includes a positive polarity selection voltage and a positive polarity and a negative polarity non-selection voltage A voltage selection circuit that alternately selects a second voltage group including a voltage group and a negative selection voltage and a positive and negative non-selection voltage;
A selection voltage of a voltage group selected by the voltage selection circuit is sequentially applied to each of the plurality of scanning lines,
A scanning line driving circuit that applies a non-selection voltage having the same polarity as the selection voltage after the application, and an intersection of the scanning line to which the scanning line driving circuit applied the selection voltage and the data line for each of a plurality of data lines And a data line driver circuit for supplying a data signal corresponding to the gray level of the pixel corresponding to.
According to these aspects, for the same reason as the electro-optical device according to the present invention, the withstand voltage required for the scanning line driving circuit can be suppressed and the circuit scale can be reduced. Each circuit constituting the drive circuit according to the present invention may be mounted on one IC chip, or each may be mounted on a separate IC chip.
Further, the drive circuit according to another aspect includes a voltage generation circuit that generates a selection voltage having a positive polarity and a negative polarity with respect to a reference voltage, and a non-selection voltage whose absolute value with respect to the reference voltage is lower than each selection voltage; A first voltage group including a positive selection voltage and a non-selection voltage is selected in the first period, and a second voltage group including a negative selection voltage and a non-selection voltage is selected as the first period. The first voltage selection circuit for selecting in a different second period, the first voltage selection circuit for selecting the second voltage group in the first period, and the first
Each of the scanning lines belonging to the first group among the plurality of scanning lines, the second voltage selecting circuit for selecting the voltage group in the second period, and the selection voltage of the voltage group selected by the first voltage selecting circuit. And a voltage selected by the second voltage selection circuit and a first scanning line driving circuit that applies a non-selection voltage of the voltage group to a non-selected scanning line among the scanning lines belonging to the first group. The group selection voltage is sequentially applied to each of the scanning lines belonging to the second group different from the first group among the plurality of scanning lines, and the second
A second scanning line driving circuit that applies a non-selection voltage of the voltage group to a non-selected scanning line among the scanning lines belonging to the group, and a first or second scanning line drive for each of the plurality of data lines The circuit includes a data line driving circuit that supplies a data signal corresponding to the gray level of the pixel corresponding to the intersection of the scanning line to which the selection voltage is applied and the data line. More specifically, the drive circuit according to this aspect includes:
A voltage generation circuit that generates a positive and negative selection voltage with respect to a reference voltage and a positive and negative non-selection voltage whose absolute value with respect to the reference voltage is lower than each selection voltage; and a positive selection voltage And a first voltage group including a positive polarity and a negative polarity non-selection voltage is selected in the first period, and a second voltage including the negative polarity selection voltage and the positive polarity and the negative polarity non-selection voltage. A first voltage selection circuit for selecting a group in a second period different from the first period; a second voltage group in the first period; and a first voltage group in the second period. A second voltage selection circuit to select at
The selection voltage of the voltage group selected by the first voltage selection circuit is sequentially applied to each of the scanning lines belonging to the first group among the plurality of scanning lines, and after the application, the non-selection having the same polarity as the selection voltage is applied. The selection voltage of the voltage group selected by the second voltage selection circuit for each of the first scanning line driving circuit for applying the voltage and the scanning lines belonging to the second group different from the first group among the plurality of scanning lines. Are sequentially applied, and after that, a second scanning line driving circuit that applies a non-selection voltage having the same polarity as the selection voltage, and a scanning in which the scanning line driving circuit applies a selection voltage to each of the plurality of data lines. A data line driving circuit for supplying a data signal corresponding to the gray level of the pixel corresponding to the intersection of the line and the data line.

The present invention is also specified as a method of driving an electro-optical device. This driving method is a method of driving an electro-optical device in which pixels are arranged corresponding to intersections of a plurality of scanning lines and a plurality of data lines, and is selected between positive polarity and negative polarity with respect to a reference voltage. A first voltage group including a positive selection voltage and a non-selection voltage, and a negative selection voltage and a non-selection voltage that generate a voltage and a non-selection voltage whose absolute value with respect to the reference voltage is lower than each selection voltage Are alternately selected, and the selected voltage of the selected voltage group is sequentially applied to each of the plurality of scanning lines, and the non-selected voltage of the voltage group is applied to the non-selected scanning lines. Each of the plurality of data lines is supplied with a data signal corresponding to the gradation of the pixel corresponding to the intersection of the scanning line to which the selection voltage is applied and the data line. The driving method according to a more specific aspect generates positive and negative selection voltages with respect to a reference voltage, and positive and negative non-selection voltages whose absolute values with respect to the reference voltage are lower than each selection voltage. And a first voltage group including a positive selection voltage and a positive and negative non-selection voltage and a second voltage group including a negative selection voltage and a positive and negative non-selection voltage. Select alternately, sequentially apply a selection voltage of the selected voltage group to each of the plurality of scanning lines, and then apply a non-selection voltage of the same polarity as the selection voltage after the application, and each of the plurality of data lines On the other hand, a data signal corresponding to the gradation of the pixel corresponding to the intersection of the scanning line to which the selection voltage is applied and the data line is supplied. According to this driving method, for the same reason as the electro-optical device according to the present invention, it is possible to suppress the withstand voltage required for the scanning line driving circuit and reduce the circuit scale.
Further, the driving method according to another aspect includes a step of generating positive and negative selection voltages with respect to a reference voltage and a non-selection voltage whose absolute value with respect to the reference voltage is lower than each selection voltage; The first voltage group including the selection voltage and the non-selection voltage is selected in the first period, and the second voltage group including the negative selection voltage and the non-selection voltage is different from the first period. A first voltage selection step to select in the second period; a second voltage group to be selected in the first period;
A second voltage selection step of selecting the voltage group in the second period, and a selection voltage of the voltage group selected in the first voltage selection step is selected from the scanning lines belonging to the first group among the plurality of scanning lines. While applying to each of them in sequence and applying the non-selection voltage of the voltage group to the non-selected scanning lines among the scanning lines belonging to the first group, the selection voltage of the voltage group selected in the second voltage selection step is applied. A plurality of scanning lines are sequentially applied to each of the scanning lines belonging to the second group different from the first group, and the non-selected voltage of the voltage group is applied to the non-selected scanning lines among the scanning lines belonging to the second group. A scanning signal to be applied and a data signal for supplying a data signal corresponding to the gradation of the pixel corresponding to the intersection of the scanning line to which the selection voltage is applied in the scanning step and the data line for each of the plurality of data lines A feeding step. The driving method according to a more specific aspect generates positive and negative selection voltages with respect to a reference voltage, and positive and negative non-selection voltages whose absolute values with respect to the reference voltage are lower than each selection voltage. And selecting a first voltage group including a positive selection voltage and a positive and negative non-selection voltage in a first period, and selecting a negative selection voltage and a positive and negative non-selection voltage. A first voltage selection step of selecting a second voltage group including a selection voltage in a second period different from the first period; and selecting a second voltage group in the first period and A second voltage selection step for selecting one voltage group in the second period, and a voltage selected in the first voltage selection step for each of the scanning lines belonging to the first group among the plurality of scanning lines. Apply the group selection voltage sequentially, and then apply the same voltage to the selection voltage. While the non-selection voltage is applied, the selection voltage of the voltage group selected in the second voltage selection step is sequentially applied to each of the scanning lines belonging to the second group different from the first group among the plurality of scanning lines. Corresponding to the intersection of the scanning line to which the selection voltage is applied and the data line for each of the plurality of data lines. Supplying a data signal corresponding to the gradation of the pixel.

<A: Configuration of electro-optical device>
FIG. 1 is a block diagram illustrating a configuration of an electro-optical device according to an embodiment of the invention. As shown in the figure, the electro-optical device D includes the electro-optical panel 10, a control circuit 37, and a voltage output circuit 40. Among them, the electro-optical panel 10 includes an element substrate on which n data lines 13 extending in the Y direction (column direction) are formed, and m elements extending in the X direction (row direction) orthogonal to the Y direction. A counter substrate on which the scanning lines 11 are formed is bonded so as to face each other, and a liquid crystal as an electro-optical material is sealed in a gap between these substrates (n and m are both natural numbers). The scanning line 11 is a strip-shaped electrode formed of a light-transmitting conductive material such as ITO (Indium Tin Oxide). A pixel P is formed at each point where the data line 13 and the scanning line 11 intersect. Therefore, these pixels P are arranged in a matrix of m rows × n columns across the X and Y directions.

FIG. 2 is a circuit diagram illustrating a configuration of the pixel P. As shown in the figure, each pixel P has a TFD (Thin Film Diode) element and a pixel capacitor 153 (liquid crystal capacitor) connected in series with each other. Among these, the pixel capacitor 153 is a capacitor composed of the scanning line 11, a pixel electrode (not shown), and liquid crystal interposed between the two. Each pixel electrode is a substantially rectangular electrode formed on the surface of the element substrate, and is arranged in a gap between each data line 13 so as to face each scanning line 11.
On the other hand, the TFD element 151 is a two-terminal type non-linear resistance element whose end opposite to the pixel capacitor 153 is connected to the data line 13. The TFD element 151 has a laminated structure of a conductor / insulator / conductor, and exhibits diode switching characteristics in which current-voltage characteristics are nonlinear in both positive and negative directions. That is, the TFD element 151 is turned on (conductive state) when the voltage applied to both ends exceeds the threshold value, and is turned off (non-conductive state) when the voltage falls below the threshold value.

The control circuit 37 shown in FIG. 1 sends various control signals and image data Dg to the electro-optical panel 1.
Supply to zero. A signal supplied from the control circuit 37 to the electro-optical panel 10 includes an AC drive signal FR. The AC drive signal FR is a signal whose logic level is inverted every frame (vertical scanning period) (see FIGS. 3 and 5). On the other hand, the image data Dg is 3-bit data that designates the gradation (luminance) of each pixel P in eight stages. In the present embodiment, the brightest white gradation is specified by the image data Dg [000], while the dark gradation is specified as the numerical value of the image data Dg increases, and the darkest by the image data Dg [111]. Assume that a black gradation is specified. Note that the electro-optical panel 10 in the present embodiment is a normally white mode display panel that displays white when no voltage is applied to the pixel capacitor 153. However, the present invention is also applied to a normally black mode electro-optical panel.

The electro-optical panel 10 includes a data line driving circuit 33 and two scanning line driving circuits 31 (31a).
, 31b). Of the total m scanning lines 11, each scanning line 11 belonging to the odd-numbered row counted from above in FIG. 1 is connected to the scanning line drive circuit 31a, and each scanning line 1 belonging to the even-numbered row.
1 is connected to the scanning line driving circuit 31b. As these scanning line drive circuits 31a and 31b operate in parallel, scanning signals Y1, Y2,..., Ym for selecting the scanning line 11 are supplied to each scanning line 11. The scanning signal Yi supplied to the i-th scanning line 11 is a voltage signal that becomes a selection voltage in the i-th horizontal scanning period (1H) of each frame and becomes a non-selection voltage in other periods. It is. On the other hand, the data line driving circuit 33 receives the image data D
Data signals X1, X2,..., Xn corresponding to the gradation specified by g are output to each data line 13. The detailed operation of each scanning line driving circuit 31 and data line driving circuit 33 will be described later.

The voltage output circuit 40 shown in FIG. 1 includes a voltage generation circuit 41 and two voltage selection circuits 43 (4
3a, 43b). Among these, the voltage generation circuit 41 is a circuit that generates various voltages used in the electro-optical panel 10 from a power source (not shown) such as a battery. The voltage generation circuit 41 in the present embodiment generates four types of voltages, that is, the voltage VSH, the voltage VSL, the voltage VDH, and the voltage VDL. Among these, the voltages VSH and VSL are adopted as selection voltages for the scanning signal Yi (i is an integer satisfying 1 ≦ i ≦ m). The voltages VDH and VDL are adopted as the non-selection voltage of the scanning signal Yi and the voltage of the data signal Xj (j is an integer satisfying 1 ≦ j ≦ n).

The voltages VDH and VDL are set to a level at which the TFD element 151 is turned off regardless of the voltage of the data signal Xj supplied to the data line 13 when each is applied to the scanning line 11. On the other hand, the selection voltages VSH and VSL are set to a level at which the TFD element 151 is turned on regardless of the voltage of the data signal Xj supplied to the data line 13 when each is applied to the scanning line 11. ing. Among these, the voltage VSH is a positive voltage (higher side) voltage with respect to the center voltage (hereinafter referred to as “reference voltage”) Vc between the voltage VDH and the voltage VDL, and the voltage VSL is negative with respect to the reference voltage Vc. (Lower side) voltage. The voltage VSH and the voltage VSL have the same absolute value as viewed from the reference voltage Vc. When the TFD element 151 is turned on by applying the voltage VSH or VSL, the pixel capacitor 153 connected to the TFD element 151 has
Charges corresponding to the difference between the selection voltage and the voltage of the data signal Xj are accumulated. Thereafter, the voltage VDH or the voltage VDL, which is a non-selection voltage, is applied to the scanning line 11 and the TFD element 151
Accumulation of charge in the pixel capacitor 153 is maintained even when is turned off. Therefore,
A desired gradation is displayed according to the voltage of the data signal Xj when the selection voltage VSH or VSL is applied to the scanning line 11.

Each voltage selection circuit 43 (43a and 43b) selects three types of voltages from the four types of voltages generated by the voltage generation circuit 41 based on the AC drive signal FR supplied from the control circuit 37. It is a circuit that outputs as voltages V1 to V3. FIG. 3 shows the voltage selection circuit 43a.
And 43b are timing charts showing a state of change in voltage selected. For convenience, the voltage V1 is indicated by a broken line, the voltage V2 is indicated by a solid line, and the voltage V3 is indicated by a one-dot chain line. As shown in FIG. 3, the voltage selection circuit 43 includes a first voltage group including three types of voltages (VSH, VDH, and VDL) counted from the higher order among the four types of voltages generated by the voltage generation circuit 41. L1 and the second including three voltages (VDH, VDL and VSL) counted from the lower side
The voltage group L2 is selected and output alternately for each frame. Further, the voltage selection circuit 43
The voltage group output from a is different from the voltage group output from the voltage selection circuit 43b.

More specifically, the voltage selection circuit 43a selects the first voltage group L1 in the frame (frames F1 and F3 in FIG. 3) in which the AC drive signal FR is at the H level.
The voltage VSH included therein is set as the voltage V1, the voltage VDH is set as the voltage V2, and the voltage VDL is set as the voltage V2.
Output as 3, respectively. In addition, the voltage selection circuit 43a selects the second voltage group L2 in the frame (frame F2 in FIG. 3) in which the AC drive signal FR is at the L level, the voltage VDH is the voltage V1, and the voltage VDL is the voltage V2. The voltage VSL is output as the voltage V3. On the other hand, the voltage selection circuit 43b selects and outputs the second voltage group L2 in the frames F1 and F3 in which the alternating drive signal FR is at the H level, while the alternating drive signal FR is in the L level. In F2, the first voltage group L1 is selected and output. The voltages V1 to V3 output from the voltage selection circuit 43a are used to generate the scanning signal Yi of the odd-numbered rows in the scanning line driving circuit 31a, and the voltages V1 to V output from the voltage selection circuit 43b.
3 is used in the scanning line driving circuit 31b to generate the scanning signal Yi for even-numbered rows.

Next, FIG. 4 is a block diagram showing a specific configuration of the scanning line driving circuit 31, and FIG.
3 is a timing chart for explaining the operation of a scanning line driving circuit 31. In FIG. 5, a signal denoted by “L” is a signal related to processing by the scanning line driving circuit 31 a, and a signal denoted by “R” is a signal related to processing by the scanning line driving circuit 31 b. . In the following, the configuration of the scanning line driving circuit 31a for driving the odd-numbered scanning lines 11 will be described, but the configuration of the scanning line driving circuit 31b for driving the even-numbered scanning lines 11 is also the same.

The shift register 311 shown in FIG. 4 has m corresponding to the total number of the scanning lines 11 in the odd-numbered rows.
As shown in FIG. 5, the start pulse DY supplied at the beginning of one vertical scanning period is sequentially shifted in synchronization with the clock signal CLY, and each of them is transferred to the transfer signal Ys1, Ys3,..., Ysm-1. As shown in FIG. 5, the clock signal CLY has a period corresponding to the time length of one horizontal scanning period (1H). When any one of the transfer signals Ysi becomes an active level (H level), it is instructed that it is a horizontal scanning period in which the i-th scanning line 11 is to be selected.

The voltage selection signal generation circuit 313 shown in FIG. 4 is based on the transfer signals Ys1 to Ysm-1 and the alternating drive signal FR, and selects a voltage selection signal Ysel (designating a voltage to be applied to the scanning line 11 of each row. Ysel1, Ysel2 and Ysel3) are output. Voltage selection signals Ysel1 to Ysel3
Are signals that are active levels (H levels) exclusively. Among these, when the voltage selection signal Ysel1 becomes an active level, selection of the voltage V1 is instructed. Similarly, when voltage selection signals Ysel2 and Ysel3 become active levels, selection of voltage V2 and voltage V3 is instructed, respectively.

The selector group 315 has three switches SW for each scanning line 11 belonging to the odd-numbered rows. One ends of these switches SW are respectively connected to supply lines for voltages V 1, V 2 and V 3, and the other ends are commonly connected to one scanning line 11. Voltage selection signals Ysel1, Ysel2, and Ysel3 are supplied to the gate terminals of the switches SW, respectively. Each switch SW is turned on (conductive state) when the voltage selection signal Ysel (Ysel1, Ysel2, or Ysel3) supplied to the gate terminal becomes an active level. Accordingly, any one of the voltages V1 to V3 is applied to each scanning line 11 via the switch SW that is alternatively turned on among the three switches SW corresponding to the scanning line 11.

Next, a specific waveform of each scanning signal Yi will be described with particular attention to the operation of the voltage selection signal generation circuit 313. As shown in FIG. 5, the scanning line driving circuit 31 divides the horizontal scanning period into two equal parts on the time axis with respect to the scanning line 11 selected by the transfer signal Ysi in the i-th horizontal scanning period. The voltage VSH or the voltage VSL is applied as the selection voltage in the latter half period (1 / 2H), while the voltage VDH or the voltage VDL that is a non-selection voltage is applied in other periods.
Apply. In other words, the voltage selection signal generation circuit 313 of the scanning line driving circuit 31a has the AC driving signal FR in the latter half of the horizontal scanning period in which the transfer signal Ysi is at the active level.
Is H level, the voltage selection signal Ysel1 for designating the voltage V1 (= VSH) is set to the active level, and if the alternating drive signal FR is L level, the voltage V3 (= VSL) is selected. The voltage selection signal Ysel3 is set to an active level. On the other hand, the voltage selection signal generation circuit 313 of the scanning line driving circuit 31b has the voltage V3 (= VSL) if the AC driving signal FR is at the H level in the second half of the horizontal scanning period in which the transfer signal Ysi is at the active level. The voltage selection signal Ysel3 for designating is set to the active level, and if the alternating drive signal FR is at the L level, the voltage selection signal Ysel1 for selecting the voltage V1 is set to the active level. Further, the voltage selection signal generation circuit 313 of each of the scanning line drive circuits 31a and 31b, regardless of the level of the AC drive signal FR, when the end point of this second half period arrives and the transfer signal Ysi transitions to the inactive level. The voltage selection signal Ysel2 is set to an active level, and the state is maintained until a horizontal scanning period in which the i-th scanning line 11 is selected.

As a result of the above operation, each scanning signal Y1 to Ym has the following waveform. That is, first, a frame in which the AC drive signal FR becomes H level (frames F1 and F3 in FIG. 3).
), The scanning signal Yi supplied to the odd-numbered scanning lines 11 becomes the voltage VSH, which is a positive selection voltage, in the latter half of the i-th horizontal scanning period, and after that, the non-polarity is the same. It becomes the voltage VDH which is the selection voltage. Further, in these frames, the scanning signal Yi supplied to the even-numbered scanning line 11 becomes the voltage VSL as a negative selection voltage in the second half of the i-th horizontal scanning period, and after that, Non-selection voltage VDL of the same polarity
It becomes. That is, a selection voltage having a reverse polarity is applied to each of the m scanning lines 11 for each row. Further, the frame in which the AC drive signal FR is at the L level (frame F in FIG. 3).
In 2), the polarity of the scanning signal Yi is reversed from the previous and subsequent frames. That is, in the frame in which the AC drive signal FR is at the L level, the scanning signal Yi corresponding to the odd-numbered row is
In the second half of the i-th horizontal scanning period, the voltage VSL is a negative selection voltage, and after that, the voltage VDL is a non-selection voltage of the same polarity. Further, the scanning signal Yi corresponding to the even-numbered row becomes the voltage VSH in the latter half of the horizontal scanning period, and after that, becomes the voltage VDH.

Next, FIG. 6 is a timing chart showing the waveform of the data signal Xj for each gradation specified by the image data Dg. As shown in the figure, in the second half of the horizontal scanning period in which the scanning signal Yi in the i-th row becomes the selection voltage, the data signal Xj supplied to the data line 13 in the j-th column is in the i-th row. It becomes a lighting voltage over a time length corresponding to the image data Dg of the pixel P belonging to the jth column, and becomes a non-lighting voltage in the remaining period. Then, the gradation of each pixel P is controlled according to the length of the period during which the lighting voltage is applied (gradation control by pulse width modulation). Here, the lighting voltage is a negative voltage VDL if the selection voltage applied to the scanning line 11 is a positive voltage VSH, and a positive voltage VDH if the selection voltage is a negative voltage VSL. It is. On the other hand, the non-lighting voltage is a voltage having the same polarity as the selected voltage among the voltage VDH and the voltage VDL. On the other hand, as shown in FIG. 6, in the first half period immediately before the second half period, the data signal Xj has a waveform whose polarity is reversed from that of the second half period. Therefore, regardless of the gray level of the pixel P, the time length during which the data signal Xj is at the voltage VDH and the time length at which the voltage VDL is at the horizontal scanning period are equal. According to this driving method, since the effective voltage value applied to the pixel P (more precisely, the pixel capacitor 153) is equal for all the pixels P in the period when the scanning line 11 is not selected, white is displayed. Even in the case of displaying a checkered pattern in which the pixels P and the pixels P for displaying black are alternately arranged in the X direction and the Y direction, or a zebra pattern in which white and black are inverted for each row, the Y direction Display unevenness in the (vertical direction) is suppressed.

As described above, in the present embodiment, the first voltage group L1 including the positive selection voltage VSH and the positive non-selection voltage VDH, the negative selection voltage VSL, and the negative non-selection voltage. The second voltage group L2 including VDL is alternately selected and used to generate the scanning line 11 in the scanning line driving circuit 31. Therefore, the scanning line driving circuit 31 is connected to the positive selection voltage VSH.
And the negative value non-selection voltage VDL (see FIG. 3) or the negative voltage selection voltage VSL and the positive non-selection voltage VDH difference value ΔV is sufficient. There is no requirement to withstand voltage to a voltage corresponding to the difference value between the positive selection voltage VSH and the negative selection voltage VSL. Therefore, according to the present embodiment, as compared with the conventional electro-optical device in which the withstand voltage from the voltage VSL to the voltage VSH is essential, the withstand voltage required for each scanning line driving circuit 31 is suppressed and the circuit is provided. The scale can be reduced.

If attention is paid only to the point that the voltage selection circuits 43a and 43b need to be added to the conventional configuration, the scale of the circuit related to the electro-optical device D increases. However, the circuit scale of the voltage selection circuits 43a and 43b constituted by several switches is sufficiently smaller than that of the scanning line driving circuit 31, and further, the scanning line driving circuit 3 is reduced by reducing the withstand voltage.
Therefore, according to the present embodiment, the circuit scale of the scanning line driving circuit 31 is reduced to a degree that greatly exceeds the increase in circuit scale due to the arrangement of the voltage selection circuits 43a and 43b. Can do. Therefore, in this embodiment, the voltage selection circuits 43a and 43b
Although it is necessary to newly arrange the circuit, the scale of the circuit is surely reduced when the electro-optical device D is viewed as a whole.

<B: Modification>
Various modifications are made to the above embodiment. An example of a specific modification is as follows. In addition, you may combine each following aspect suitably.

(1) In the embodiment, the electro-optical device D including the two scanning line driving circuits 31 a and 31 b is illustrated, but a configuration in which all the scanning lines 11 are connected to one scanning line driving circuit 31 is also employed. The In this configuration, one voltage selection circuit 4 is provided before the scanning line driving circuit 31.
3 is enough. The voltage selection circuit 43 outputs voltages V1 to V3 in the same manner as any one of the voltage selection circuits 43a and 43b shown in FIG. Further, in the embodiment, the configuration in which all the scanning lines 11 are divided into the odd-numbered rows and the even-numbered rows and each of them is driven by the separate scanning line driving circuits 31a and 31b is exemplified. The method of classification is not limited to this. For example, the m scanning lines 11 are divided into a group from the first row to the m / 2nd row and a group from the (m / 2 + 1) th row to the mth row, and belong to each group. The scanning line 11 may be driven by a separate scanning line driving circuit 31. Accordingly, the unit of the scanning line 11 to which the scanning signal Yi having the reverse polarity is supplied in one vertical scanning period is also 1
For example, the polarity of the scanning signal Yi may be inverted every two scanning lines 11.

(2) In the embodiment, the configuration in which the polarity of the voltage of the scanning signal Yi is inverted every frame is exemplified, but the inversion cycle is arbitrary. For example, a configuration in which the polarity of the scanning signal Yi is inverted every two or more frames is also employed. Further, although the configuration in which the selection voltage is applied to the scanning line 11 in the second half period of one horizontal scanning period is illustrated, the configuration in which the selection voltage is applied in the first half period is also employed. In the embodiment, the configuration in which the voltage applied to the non-selected scanning line 11 is alternately switched between the voltage VDH and the voltage VDL is exemplified. However, for the non-selected scanning line 11, the polarity of the selected voltage is selected. Regardless of this, only one type of non-selection voltage may be applied.

(3) In the embodiment, the configuration in which the lighting voltage is applied to the data line 13 in the period including the end point in the latter half period is illustrated, but the period in which the lighting voltage is applied (or the non-lighting voltage is applied). The period including the start point of the second half period and the first half period may be a period between the start point and the end point in each of the second half period and the first half period.
In short, a configuration in which the lighting voltage is applied over the time length corresponding to the image data Dg in the first half period and the second half period is sufficient. However, the method for generating the data signal Xj is not limited to the pulse width modulation method. For example, the data signal Xj may be a voltage signal at a level corresponding to the image data Dg.

(4) In the embodiment, the control circuit 37, the voltage generation circuit 41, and the voltage selection circuit 43 (43a
, 43b) is illustrated as being mounted on the outside of the electro-optical panel 10 (for example, a wiring board bonded to the electro-optical panel 10). However, a configuration in which these circuits are mounted on the electro-optical panel 10 is also employed. The Further, the scanning line driving circuit 31 (31a, 31b), the data line driving circuit 3
3. A part or all of the control circuit 37, the voltage generation circuit 41, and the voltage selection circuit 43 (43a, 43b) may be mounted on one IC chip.

(5) In the embodiment, the active matrix type electro-optical device D including the TFD element 151 which is a two-terminal nonlinear element is illustrated, but the liquid crystal is formed by crossing the strip-shaped electrodes without using this kind of nonlinear element. The present invention is also applied to a passive matrix type electro-optical device that sandwiches the substrate. In the embodiment, the configuration in which the TFD element 151 is connected to the data line 13 and the pixel capacitor 153 is connected to the scanning line 11 is exemplified.
A configuration in which the FD element 151 is connected to the scanning line 11 and the pixel capacitor 153 is connected to the data line 13 is also employed.

(6) The present invention is also applied to electro-optical devices other than liquid crystal devices. That is, the present invention is applied in the same manner as in the embodiment as long as it is an apparatus that displays an image using an electro-optical material whose optical characteristics change according to an electric signal. For example, an EL display device using EL (Electro Luminescent) as an electro-optical material, an electrophoretic display device using microcapsules containing a colored liquid and white particles dispersed in the liquid as an electro-optical material, Twisted ball display using twisted balls painted in different colors for areas of different polarity as electro-optical materials, toner display using black toner as electro-optical materials, or electro-optics of high-pressure gas such as helium or neon The present invention is applied to various electro-optical devices such as a plasma display panel (PDP) used as a substance.

<C: Electronic equipment>
Next, an electronic apparatus including the electro-optical device according to the invention as a display device will be described.
FIG. 7 is a perspective view illustrating a configuration of a mobile phone having the electro-optical device D according to the embodiment. As shown in this figure, the mobile phone 1200 includes a plurality of operation buttons 1202 operated by a user, a mouthpiece 1204 for outputting a sound received from another terminal device, and a sound transmitted to the other terminal device. In addition to the mouthpiece 1206 for inputting, an electro-optical device D for displaying various images is provided.

In addition to the mobile phone shown in FIG. 7, examples of electronic devices that can use the electro-optical device according to the present invention include notebook personal computers, liquid crystal televisions, viewfinder type (or monitor direct view type). Examples include a video recorder, a digital camera, a car navigation device, a pager, an electronic notebook, a calculator, a word processor, a workstation, a videophone, a POS terminal, and a device equipped with a touch panel. In any electronic device, high-quality display with reduced lateral crosstalk is realized with a simple configuration.

1 is a block diagram illustrating a configuration of an electro-optical device according to an embodiment of the invention. FIG. It is a circuit diagram which shows the structure of each pixel. It is a timing chart which shows operation | movement of a voltage selection circuit. It is a block diagram which shows the structure of a scanning line drive circuit. 3 is a timing chart illustrating an operation of a scanning line driving circuit. 6 is a timing chart showing the operation of the data line driving circuit. It is a perspective view which shows the structure of the mobile telephone which is an example of the electronic device which concerns on this invention.

Explanation of symbols

D: Electro-optical device, 10: Electro-optical panel, 11: Scan line, 13: Data line, P
... Pixel, 151... TFD element, 153... Pixel capacity, 31 (31 a, 31 b)... Scan line driving circuit, 311.
... selector group, SW ... switch, 33 ... data line drive circuit, 37 ... control circuit, 40
...... Voltage output circuit, 41 ...... Voltage generation circuit, 43 (43a, 43b) ...... Voltage selection circuit,
VSH: Positive polarity selection voltage, VSL: Negative polarity selection voltage, VDH: Positive polarity non-selection voltage,
VDL: negative non-selection voltage, Vc: reference voltage, L1: first voltage group, L2: second voltage group, FR: alternating drive signal, Yi: scanning signal, Xj: ... data signal.

Claims (12)

A pixel disposed corresponding to each intersection of a plurality of scanning lines and a plurality of data lines;
A voltage generation circuit that generates a selection voltage having a positive polarity and a negative polarity with respect to a reference voltage, and a non-selection voltage whose absolute value with respect to the reference voltage is lower than each of the selection voltages;
A voltage selection circuit that alternately selects a first voltage group including the positive selection voltage and the non-selection voltage and a second voltage group including the negative selection voltage and the non-selection voltage;
A scanning line driving circuit that sequentially applies a selection voltage of a voltage group selected by the voltage selection circuit to each of the plurality of scanning lines and applies a non-selection voltage of the voltage group to an unselected scanning line;
A data line driving circuit that supplies, to each of the plurality of data lines, a data signal corresponding to the gray level of the pixel corresponding to the intersection of the scanning line to which the scanning line driving circuit applied the selection voltage and the data line; An electro-optical device comprising: A pixel disposed corresponding to each intersection of a plurality of scanning lines and a plurality of data lines;
A voltage generation circuit that generates a positive and negative selection voltage with respect to a reference voltage and a positive and negative non-selection voltage whose absolute value with respect to the reference voltage is lower than each selection voltage;
A first voltage group including the positive selection voltage and the positive and negative non-selection voltages, and a second voltage including the negative selection voltage and the positive and negative non-selection voltages. A voltage selection circuit for alternately selecting groups;
A scanning line driving circuit that sequentially applies a selection voltage of a voltage group selected by the voltage selection circuit to each of the plurality of scanning lines, and applies a non-selection voltage having the same polarity as the selection voltage after the application,
A data line driving circuit that supplies, to each of the plurality of data lines, a data signal corresponding to the gray level of the pixel corresponding to the intersection of the scanning line to which the scanning line driving circuit applied the selection voltage and the data line; An electro-optical device comprising: A pixel disposed corresponding to each intersection of a plurality of scanning lines and a plurality of data lines;
A voltage generation circuit that generates a selection voltage having a positive polarity and a negative polarity with respect to a reference voltage, and a non-selection voltage whose absolute value with respect to the reference voltage is lower than each of the selection voltages;
A first voltage group including the positive selection voltage and the non-selection voltage is selected in a first period, and a second voltage group including the negative selection voltage and the non-selection voltage is selected from the first voltage group. A first voltage selection circuit that selects in a second period different from the first period;
The second voltage group is selected in the first period, and the first voltage group is selected in the second period.
A second voltage selection circuit that selects in a period of
The selection voltage of the voltage group selected by the first voltage selection circuit is sequentially applied to each of the scanning lines belonging to the first group among the plurality of scanning lines and is not selected among the scanning lines belonging to the first group. A first scanning line driving circuit that applies a non-selection voltage of the voltage group to the scanning lines;
The selection voltage of the voltage group selected by the second voltage selection circuit is sequentially applied to each of the scanning lines belonging to the second group different from the first group among the plurality of scanning lines, and applied to the second group. A second scanning line driving circuit for applying a non-selection voltage of the voltage group to a non-selected scanning line among the scanning lines belonging to the display line;
For each of the plurality of data lines, a data signal corresponding to the gray level of the pixel corresponding to the intersection of the scan line to which the first or second scan line driving circuit applied the selection voltage and the data line is supplied. An electro-optical device comprising: a data line driving circuit. A pixel disposed corresponding to each intersection of a plurality of scanning lines and a plurality of data lines;
A voltage generation circuit that generates a positive and negative selection voltage with respect to a reference voltage and a positive and negative non-selection voltage whose absolute value with respect to the reference voltage is lower than each selection voltage;
A first voltage group including the positive selection voltage and the positive and negative non-selection voltages is selected in a first period, and the negative selection voltage and the positive and negative non-selection voltages are selected. A first voltage selection circuit that selects a second voltage group including a selection voltage in a second period different from the first period;
The second voltage group is selected in the first period, and the first voltage group is selected in the second period.
A second voltage selection circuit that selects in a period of
The selection voltage of the voltage group selected by the first voltage selection circuit is sequentially applied to each of the scanning lines belonging to the first group among the plurality of scanning lines, and after the application, the same polarity as the selection voltage is applied. A first scanning line driving circuit for applying a non-selection voltage of
The selection voltage of the voltage group selected by the second voltage selection circuit is sequentially applied to each of the scanning lines belonging to the second group different from the first group among the plurality of scanning lines, and after the application A second scanning line driving circuit for applying a non-selection voltage having the same polarity as the selection voltage;
A data line driving circuit that supplies, to each of the plurality of data lines, a data signal corresponding to the gray level of the pixel corresponding to the intersection of the scanning line to which the scanning line driving circuit applied the selection voltage and the data line; An electro-optical device comprising: The first group of scan lines is a scan line belonging to one of the odd and even rows among the plurality of scan lines, and the second group of scan lines is an odd and even row of the plurality of scan lines. The electro-optical device according to claim 3, wherein the scanning line belongs to the other of the rows. Each of the first and second voltage selection circuits alternates between the first voltage group and the second voltage group for each frame in which each of the plurality of scanning lines is selected once. The electro-optical device according to claim 3 or 4. The electro-optical device according to claim 3, wherein one of the scanning line and the data line is connected to the pixel via a two-terminal nonlinear element.   An electronic apparatus comprising the electro-optical device according to claim 1. A circuit for driving an electro-optical device in which pixels are arranged corresponding to each intersection of a plurality of scanning lines and a plurality of data lines,
A voltage generation circuit that generates a selection voltage having a positive polarity and a negative polarity with respect to a reference voltage, and a non-selection voltage whose absolute value with respect to the reference voltage is lower than each of the selection voltages;
A voltage selection circuit that alternately selects a first voltage group including the positive selection voltage and the non-selection voltage and a second voltage group including the negative selection voltage and the non-selection voltage;
A scanning line driving circuit that sequentially applies a selection voltage of a voltage group selected by the voltage selection circuit to each of the plurality of scanning lines and applies a non-selection voltage of the voltage group to an unselected scanning line;
A data line driving circuit that supplies, to each of the plurality of data lines, a data signal corresponding to the gray level of the pixel corresponding to the intersection of the scanning line to which the scanning line driving circuit applied the selection voltage and the data line; A drive circuit comprising: A circuit for driving an electro-optical device in which pixels are arranged corresponding to each intersection of a plurality of scanning lines and a plurality of data lines,
A voltage generation circuit that generates a selection voltage having a positive polarity and a negative polarity with respect to a reference voltage, and a non-selection voltage whose absolute value with respect to the reference voltage is lower than each of the selection voltages;
A first voltage group including the positive selection voltage and the non-selection voltage is selected in a first period, and a second voltage group including the negative selection voltage and the non-selection voltage is selected from the first voltage group. A first voltage selection circuit that selects in a second period different from the first period;
The second voltage group is selected in the first period, and the first voltage group is selected in the second period.
A second voltage selection circuit that selects in a period of
The selection voltage of the voltage group selected by the first voltage selection circuit is sequentially applied to each of the scanning lines belonging to the first group among the plurality of scanning lines and is not selected among the scanning lines belonging to the first group. A first scanning line driving circuit that applies a non-selection voltage of the voltage group to the scanning lines;
The selection voltage of the voltage group selected by the second voltage selection circuit is sequentially applied to each of the scanning lines belonging to the second group different from the first group among the plurality of scanning lines, and applied to the second group. A second scanning line driving circuit for applying a non-selection voltage of the voltage group to a non-selected scanning line among the scanning lines belonging to the display line;
For each of the plurality of data lines, a data signal corresponding to the gray level of the pixel corresponding to the intersection of the scan line to which the first or second scan line driving circuit applied the selection voltage and the data line is supplied. And a data line driving circuit. A method of driving an electro-optical device in which pixels are arranged corresponding to each intersection of a plurality of scanning lines and a plurality of data lines,
Generating a selection voltage having a positive polarity and a negative polarity with respect to a reference voltage and a non-selection voltage whose absolute value with respect to the reference voltage is lower than each of the selection voltages;
Alternately selecting a first voltage group including the positive selection voltage and the non-selection voltage and a second voltage group including the negative selection voltage and the non-selection voltage;
Applying a selection voltage of the selected voltage group sequentially to each of the plurality of scanning lines and applying a non-selection voltage of the voltage group to a non-selected scanning line;
A driving method of an electro-optical device, wherein a data signal corresponding to a gray level of a pixel corresponding to an intersection between a scanning line to which the selection voltage is applied and the data line is supplied to each of the plurality of data lines. A method of driving an electro-optical device in which pixels are arranged corresponding to each intersection of a plurality of scanning lines and a plurality of data lines,
Generating positive and negative selection voltages with respect to a reference voltage and a non-selection voltage whose absolute value with respect to the reference voltage is lower than each of the selection voltages;
A first voltage group including the positive selection voltage and the non-selection voltage is selected in a first period, and a second voltage group including the negative selection voltage and the non-selection voltage is selected from the first voltage group. A first voltage selection step of selecting in a second period different from the first period;
The second voltage group is selected in the first period, and the first voltage group is selected in the second period.
A second voltage selection step to select in the period of
The selection voltage of the voltage group selected in the first voltage selection step is sequentially applied to each of the scanning lines belonging to the first group among the plurality of scanning lines, and non-of the scanning lines belonging to the first group. While the non-selection voltage of the voltage group is applied to the selected scanning line, the selection voltage of the voltage group selected in the second voltage selection step is different from the first group among the plurality of scanning lines. A scanning step of sequentially applying to each of the scanning lines belonging to the group and applying a non-selected voltage of the voltage group to a non-selected scanning line among the scanning lines belonging to the second group;
Supplying each of the plurality of data lines with a data signal corresponding to the gray level of the pixel corresponding to the intersection of the scanning line to which the selection voltage is applied in the scanning step and the data line. Device driving method.

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