JP2003280606A - Method and device for driving electrooptic element, and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a flicker generated owing to difference luminance in a subfield period, wherein liquid crystal is turned on within a frame period, for every frame period for the same gradation. <P>SOLUTION: A subfield period is selected conforming to a 1st rule for one electrooptic element included in one group and a subfield period is selected conforming to a 2nd rule which is a 2nd rule for electrooptic elements included in another group and prescribed in relation to cycles wherein a light source varies in illuminance; and the above mentioned electrooptic element included in the above mentioned one group is driven during the subfield period selected conforming to the 1st rule and the electrooptic elements included in the above mentioned other group are driven during the subfield period selected conforming to the 2nd rule. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method and a driving device for driving an electro-optical element such as liquid crystal, and electronic equipment including the driving device.

[0002]

2. Description of the Related Art According to a conventional subfield driving method known as one of driving methods for liquid crystals used in electronic devices such as mobile phones, a unit for driving a plurality of liquid crystals arranged in a matrix. Of a plurality of subfield periods constituting one frame period which is time, a subfield period corresponding to grayscale data defining multiple grayscales to be displayed by each liquid crystal is selected, and a subfield period of the selected subfield period is selected. By driving the liquid crystals for a period of time, the multi-gradation is displayed on the liquid crystals. More specifically, for example, "
Assuming that the frame period is divided into 15 subfield periods in order to display 16 gradations from 0 "to" 15 ", the liquid crystal is driven for 7 subfield periods, that is, By turning on
The gradation corresponding to 7 "is displayed.

[0003]

However, the above-mentioned electronic device may be used under a light source such as a fluorescent lamp whose brightness changes periodically. Since the cycle in which the brightness of the light source changes is different from the cycle of the frame period, for example, in a certain frame period, the light source of the light source in the subfield period driven to display the gray scale of “7” is displayed. It occurs that the luminance is high, and on the other hand, in another certain frame period, the luminance of the light source is low in the sub-field period that is driven to display the gray scale of "7". As a result, under the high brightness, the gradation of "7" displayed by the liquid crystal is visually recognized close to the gradation of "8",
On the other hand, the liquid crystal displays "7" under the low brightness.
There is a problem in that flicker occurs in which the gradation is visually recognized as being close to the gradation of "6".

[0004]

In order to solve the above-mentioned problems, a driving method of an electro-optical element according to the present invention uses a plurality of light sources whose brightness is periodically changed and arranged in a matrix. Each sub-field period is a unit time for driving each electro-optical element according to grayscale data that defines multiple grayscales to be displayed by each electro-optical element, and a plurality of sub-fields that form the frame period are provided. By controlling the progress of the light from the light source by driving each electro-optical element during a sub-field period corresponding to the gray-scale data in the field period, the gray-scale is displayed on each electro-optical element. A method for driving an electro-optical element, wherein the two groups are at least two groups, each group including a part of the plurality of electro-optical elements. A subfield corresponding to the grayscale data for the one electro-optical element in the plurality of subfield periods for the one electro-optical element included in the one group. A first selecting step of selecting a period according to a first rule defining a correspondence relationship between each gradation of the multi-gradation and a position of a subfield period to be selected corresponding to each gradation; Of the one group other than the one group,
Of the plurality of subfield periods for the one electro-optical element included in the other one group, the subfield period corresponding to the grayscale data for the one electro-optical element is set to each of the grayscales. And a position of a subfield period selected under the first rule for the same gradation, which is a second rule that defines the relationship between the position and the position of the subfield period to be selected corresponding to the gradation. A second selecting step of selecting a correspondence relationship with a position of a subfield period selected under the second rule in accordance with the second rule defining in relation to a cycle in which the brightness of the light source changes; During the sub-field period selected by the first selecting step, a first driving step of driving the one electro-optical element included in the one group, and a selection by the second selecting step. Previous During the sub-field period, the driving of the one of the electro-optical element included in the other first group of 2
And a driving step of.

A driving device for an electro-optical device according to the present invention is
A plurality of electro-optical elements arranged in a matrix using a light source whose brightness changes periodically, according to grayscale data that defines multiple grayscales to be displayed throughout a frame period, each subfield period is From the light source by driving each electro-optical element during a sub-field period corresponding to the grayscale data among a plurality of sub-field periods constituting the frame period, which is a unit time for driving the electro-optical element By controlling the progress of light
An electro-optical element driving device for displaying the gradation on each of the electro-optical elements, wherein the electro-optical element driving device includes at least two groups, each group including a part of the plurality of electro-optical elements. One group of the two groups corresponds to the grayscale data for the one electro-optical element in the plurality of subfield periods for the one electro-optical element included in the one group. A first selection unit that selects a subfield period according to a first rule that defines a correspondence relationship between each of the grayscales and a position of the subfield period that should be selected corresponding to each grayscale; Of the at least two groups other than the one group, the one electro-optical element among the plurality of sub-field periods for the one electro-optical element included in the other one group. The gradation data for the device The sub-field period corresponding to,
A second rule for defining a relationship between each gradation and a position of a subfield period to be selected corresponding to the gradation,
The correspondence between the position of the sub-field period selected under the first rule and the position of the sub-field period selected under the second rule for the same gradation is set to the cycle in which the brightness of the light source changes. The second electro-optical element included in the one group during the sub-field period selected by the second selection section and the first selection section which are selected according to the second rule defined in association with each other. And a second drive unit for driving the one electro-optical element included in the other one group during the subfield period selected by the second selection unit. It is characterized by including and.

An electronic device according to the present invention is characterized by including the above-mentioned drive device for the electro-optical element.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 shows the configuration of an electro-optical device according to the first embodiment. The electro-optical device 1 is, for example, a well-known semi-transmissive reflection type display device, and is of a fluorescent lamp in which the brightness changes in a cycle close to the cycle of a frame period which is a display unit of the electro-optical device 1. In order to perform display under such an external light source, as shown in FIG. 1, it functions as a display unit 100, an oscillation circuit 200, a timing signal generation circuit 300, a first selection unit and a second selection unit. Data conversion circuit 400, a scanning line driving circuit 500, and a data line driving circuit 600 functioning as a first driving unit and a second driving unit.

In the following description, the signal voltage ± V is applied to the data line.
Applying is called "driving on", and applying a signal voltage 0 is called "driving off". Since the liquid crystal requires AC driving, the application of the signal voltage + V and the application of the signal voltage −V are substantially synonymous from the viewpoint of gray scale. Pixels 110 of the same type are arranged in m rows × n columns, and scanning lines 112 for selecting the plurality of pixels 110 are formed extending in the X direction, while gray scales are formed in the plurality of pixels 110. A data line 114 that defines the line is formed extending in the Y direction.

The electro-optical device 1 includes the oscillation circuit 20.
0, under the control of the timing signal generation circuit 300 and the data conversion circuit 400, the scanning line drive circuit 500
The subfield driving method is performed on the display unit 100 in cooperation with the data line driving circuit 600. That is, in the electro-optical device 1, in one frame period,
A line sequence of sequentially selecting a predetermined number of pixels arranged along the X direction in the Y direction is performed, and a signal voltage of 0 or ± V for defining gradation is set to the predetermined number of pixels. By applying, the gradation is displayed on the predetermined number of pixels.

More specifically, the electro-optical device 1 is
For each of the predetermined number of pixels arranged in one row,
Of the plurality of subfield periods forming one frame period, the subfield period corresponding to the gradation data of the pixel is selected. By applying the signal voltage to the pixel during the selected sub-field period, the effective value of the voltage applied to each pixel is changed. This allows
A gradation defined by the gradation data is displayed in each pixel in one frame period.

In the electro-optical device 1, the pixels 110 are divided into two groups in advance. The electro-optical device 1 performs the sub-field driving for the pixels 110 belonging to one group and the sub-field driving for the pixels 110 belonging to the other group to the data conversion circuit 4.
Control is performed according to the truth table 700 provided in 00 that functions as the first rule and the second rule.

FIG. 2 shows the division of pixels. As an example of the plurality of divisions described above, for example, as shown in FIG. 2A, a first group of pixels 110 on odd-numbered data lines such as data lines d1 and d3 and a data line d2. And a second group of pixels 110 on even data lines, such as d4, and pixels on odd scan lines, such as scan lines G1 and G3, as shown in FIG. 2 (b). 110 and pixels 110 on even scan lines such as scan lines G2 and G4, FIG. 2 (c).
As shown in (G1, d1) and (G2, d2)
A first group of pixels 110 at positions such as
Pixels 110 adjacent to each other in the direction of the scan line or the data line may belong to different groups so as to be divided into a second group of pixels 110 located at positions (G2, d1) and (G1, d2). In other words, it is possible to divide the adjacent pixels along the diagonal so that they belong to the same group.

The scanning line driving circuit 500 and the data line driving circuit 600 are supplied with signals necessary for performing the subfield driving in cooperation from the oscillation circuit 200, the timing signal generating circuit 300 and the data converting circuit 400. It Of these circuits, the data conversion circuit 400 is
3-bit gradation data D2 to D0 defining 8 gradations are supplied, and a data signal D based on the gradation data D2 to D0.
s, and outputs the data signal Ds to the data line drive circuit 60.
Output to 0. In order to convert the gradation data D2 to D0 into the data signal Ds, the truth table 700 described above.
Have. Here, for example, D2 is the most significant bit, while D0 is the least significant bit.

FIG. 3 shows the correspondence between gradations and subfield periods to be driven. The correspondence shown in FIG. 3A is used for subfield driving of the pixels 110 belonging to the first group shown in FIG.
The correspondence relationship shown in is used for subfield driving of the pixels 110 belonging to the second group shown in FIG.

One frame period (1F) has seven sub-field periods having the same length "1" as shown in FIGS. 3A and 3B in order to display 8 gradations. S
The sub-field periods Sf1 to Sf7 are the same in length. For example, when the gradation “010” is to be displayed, the pixel 110 is driven on for two subfield periods, and when the gradation “101” is to be displayed, the pixel 110 has five subfield periods. Meanwhile, the pixel 110 is driven on.

On the other hand, as shown in FIGS. 3 (a) and 3 (b),
The arrangement of the sub-field periods to be turned on is shifted by a time corresponding to approximately one quarter of the cycle in which the brightness of the external light source changes. For example, the gradation to be displayed is gradation "00.
1 ”, the data line driving circuit 6
00 corresponds to the pixel 110 of the first group in FIG.
According to the correspondence relationship of (a), the subfield period sf1
To drive the pixel 110 to turn on, and to add the pixel 1 to the second group.
For No. 10, the pixel 1 in the subfield period sf3
10 is turned on, and the former subfield period sf1
And the position of the latter subfield period sf3 are
They differ by about a quarter of the period in which the brightness of the external light source changes.

FIG. 4 shows a truth table provided in the data conversion circuit corresponding to the correspondence relationships of FIGS. 3 (a) and 3 (b). The truth table 700 includes the gradation data D2 to D2 of FIG.
The sub-field period in which the pixel 110 is to be turned on is shown by 1/0, which corresponds to the gradation defined by D0. For example, in order to display the gradation “010”, the data line driving circuit 600, for the pixel 110 belonging to the first group, has two sub-field periods sf1 according to the truth table of FIG. And sf2, the pixel 110 is turned on, while for the pixel 110 belonging to the second group, during the two subfield periods sf3 and sf4 according to the truth table of FIG. The pixel 110 is driven on.

FIG. 5 shows another pixel division. Figure 2
Instead of the pixel division shown in FIG. 5A, as shown in FIG. 5A, each of the two data lines d1 and d2, d
3 and d4, d5 and d6. ． ． 5 is divided into a first group and a second group composed of pixels 110 connected to every two data lines as described above, and instead of the pixel division shown in FIG. As shown in (b), each is 3
Book data lines d1, d2 and d3, data lines d4, d5
And d6 ,. ． ． It is also possible to divide into a first group and a second group composed of pixels 110 connected to every three data lines as described above.

Similarly, instead of the pixel division shown in FIGS. 2B and 2C, a first group and a second group of pixels 110 each connected to every two or three scanning lines are provided. It is also possible to divide into a first group and a second group, each of which is composed of pixels 110 connected to two or three diagonal lines.

As described above, in the electro-optical device 1 according to the first embodiment, the plurality of pixels 110 are the pixels 110.
A truth table for each group, which is divided into a first group and a second group in advance from the viewpoint of the arrangement position of the pixel, and the driving timing of the pixel 110 is defined from the viewpoint of the change in the brightness of the light source. 700 is prepared, and the data line driving circuit 6
00 is, for the pixels 110 belonging to the first group,
Subfield driving is performed according to the truth table for the first group, and for the pixels 110 belonging to the second group,
Subfield driving is performed according to the truth table for the second group. Accordingly, for the same gray level, the luminance is high due to the influence of the external light source in the sub-field period driven in a certain frame period, and on the other hand, the external light source in the sub-field period driven in another frame period. Since it is possible to suppress the frequency of occurrence of a situation where the luminance becomes low due to the influence of, the deterioration of the image quality such as flicker that occurs in the conventional subfield driving method can be reduced.

[Second Embodiment] A second embodiment will be described. The second embodiment differs from the first embodiment in pixel division and a truth table, divides pixels into three groups, and uses three truth tables. Hereinafter, the pixel division and the truth table according to the second embodiment will be described.

FIG. 6 shows image division according to the second embodiment. In the second embodiment, the pixel 110 shown in FIG.
Is, for example, as shown in FIG. 6A, the data line d
A first group of pixels 110 on a (3m + 1) th (m is an integer greater than or equal to 0) data line, such as 1 and d4, on a (3m + 2) th data line, such as data lines d2 and d5. Second group of pixels 110 and data line d3
A third pixel consisting of pixels 110 on the m-th data line such as
Are pre-divided into groups. Instead of the division mode shown in FIG. 6A, the pixel 110 shown in FIG.
As shown in (b), the first group of the pixels 110 on the (3n + 1) th (n is an integer of 0 or more) scan line such as the scan lines G1 and G4, the scan lines G2 and G5. It is divided in advance into a second group of pixels 110 on the (3n + 2) th scanning line and a third group of pixels 110 on the nth scanning line such as the scanning line G3. Instead of the division form shown in FIGS. 6A and 6B, the pixel 110 shown in FIG. 1 is a pixel such as a pixel (G1, d1) as shown in FIG. 6C, for example. First group consisting of 110, pixel (G2, d1) and pixel (G1, d2)
A second group of pixels 110 such as
3, d1), (G2, d2), (G1, d3), such as a third group of pixels 110, such that adjacent pixels 110 belong to different groups, in other words,
Pixels 110 adjacent to each other along one diagonal are preliminarily divided so that they belong to the same group.

FIG. 7 shows the correspondence relationship between gradation and subfield period to be driven. 7 (a), (b), (c)
Then, similarly to the correspondence relationship shown in FIGS. 2A and 2B,
One frame period (1F) has seven sub-field periods sf1 having the same length so as to display eight gradations.
.About.sf7.

The correspondence shown in FIG. 7A is as shown in FIG.
The correspondence relationships shown in FIG. 7B are used to perform subfield driving for the pixels 110 belonging to the first group shown in FIGS. 6A and 6B, respectively.
The correspondence relationship shown in FIG. 7C is used to perform subfield driving for the pixels 110 belonging to the second group shown in each of FIGS. 6A and 6B.
It is used to perform subfield driving for the pixels 110 belonging to the third group shown in each of (a), (b), and (c).

On the other hand, regarding the relationship between the correspondence relationships of FIGS. 7A, 7B and 7C, for example, the relationship between the correspondence relationship of FIG. 7A and the correspondence relationship of FIG. 2A and the relationship between FIG. 2B, it is defined that they differ by about a quarter of the cycle of the change in the brightness of the light source. Similarly, the relationship between the correspondence relationship of FIG. 7B and the correspondence relationship of FIG. 7C is also defined so as to differ by about a quarter of the cycle of the change in the brightness of the light source.

Since the mutual relationship of the correspondences of FIGS. 7A, 7B, and 7C, that is, the arrangement of the subfield periods is defined as described above, for example, the gradation is "001".
1 is displayed, the data line driving circuit 600 shown in FIG.
The pixel 110 is driven to be turned on during the subfield period sf1, and for the pixel 110 belonging to the second group, the pixel 110 is driven to be turned on during the subfield period sf3.
Regarding the pixel 110 belonging to the group, the pixel 110 is driven to be turned on during the subfield period sf5.

The position of the sub-field period in which the pixels 110 belonging to each group should be driven on is the truth table provided in the data conversion circuit 400 shown in FIG. 1, as in the first embodiment. 7 and is identified by a truth table (not shown) similar to the truth table 700 of FIG. 4 corresponding to the correspondence relationship of FIG.

As described above, according to the second embodiment, the plurality of pixels 110 shown in FIG. 1 are divided into three groups in advance, and the pixels 110 belonging to each group have the luminance change of the light source. Since subfield driving is performed in accordance with a rule defined from the viewpoint of the period, the deterioration of image quality such as flicker that occurs under the conventional subfield driving method is reduced as in the first embodiment. Will be possible.

[Third Embodiment] A third embodiment will be described. In the third embodiment, similarly to the first embodiment, the pixel 110 shown in FIG. 1 is divided into two groups in advance, while on the other hand, the pixel shown in FIG. 3 described in the first embodiment is used. The frame period has a configuration different from that of the frame period. That is, the third embodiment differs from the first embodiment in the distribution of the length of the subfield period, that is, the weighting. Hereinafter, the subfield period of the third embodiment will be described.

FIG. 8 shows the correspondence between the gradation and the subfield period to be driven. In the correspondence relationship between FIGS. 8A and 8B, each frame period (1F) has a first subfield period sf1 having a length weighted by “1” to display 16 gray levels, A second subfield period sf2 having a weighted length of "2", and "
It is composed of a third sub-field period sf3 to sf5 having a weighted length of 4 ".
The relationship between the correspondence relationship of FIG. 8A and the correspondence relationship of FIG. 8B is the same as the relationship between the correspondence relationship of FIG. 3A and the correspondence relationship of FIG. The third sub-field period having a weighted length of "4", which corresponds to approximately a quarter of the changing period of the luminance of the external AC light source described in the above-mentioned embodiment, is different. ing.

For example, when the gradation "0001" is to be displayed, the data line driving circuit 600 shown in FIG. 1 has the pixel 110 belonging to the first group shown in FIG. In the subfield period sf1 located at the beginning of the frame period (1F), the pixel 11
For the pixels 110 belonging to the second group shown in FIG. 2 which are driven 0, the subfield period located between the beginning and the center of the frame period (1F) according to the correspondence relationship of FIG. 8B. The pixel 110 is driven to sf1.

Instead of the two correspondences shown in FIG. 8, it is possible to use other correspondences.

9 and 10 show other correspondence relationships between gradations and subfield periods to be driven. The correspondence relationship of FIG. 9A is the pixel 110 belonging to the first group shown in FIG.
9 is used to drive the
It is used to drive the pixels 110 belonging to the second group shown in FIG. In the frame period (1F) shown in FIGS. 9A and 9B, “1” and “” are displayed in order to display 16 gradations.
It is composed of subfield periods sf1 to sf5 having lengths weighted with 2 "," 3 "," 4 ", and" 5 ". )
Similar to the relationship between the correspondence relationships shown in FIG. 8, the correspondence relationship of 1 corresponds to approximately one quarter of the cycle of the brightness change of the external light source, and the length weighted by “3” is given. Are different only in the subfield period sf5.

Similarly, the correspondence relationship of FIG.
2 is used to drive the pixels 110 belonging to the first group, and the correspondence relationship of FIG. 10B is used to drive the pixels 110 belonging to the second group shown in FIG. To be In the frame period (1F) shown in FIGS. 10A and 10B, each is "1" in order to display 16 gradations.
Mutually adjacent first subfield periods sf1 to sf3 having weighted lengths, and a subfield period subsequent to the subfield period sf3, the subfield periods being defined according to driving characteristics of the electro-optical element. A subfield period sf4 unique to the electro-optical element, and a second subfield period sf5 adjacent to each other having a weighted length of "4", which is a subfield period subsequent to the subfield period sf4. sf7 and the correspondence relationship of FIG. 10 (a) and FIG.
The 0 (b) correspondence relationship is similar to the relationship between the correspondence relationships shown in FIG. 8, and is weighted with "4", which corresponds to approximately one quarter of the cycle of the brightness change of the external light source. Only the subfield periods sf7 having different lengths are different.

The data line drive circuit 600 shown in FIG.
As an alternative to the correspondence shown in FIG. 8, in the subfield period specified according to the correspondence shown in FIG. 9 or 10, the pixels 110 in the first group and the second group in the first group 110 shown in FIG. Subfield driving is performed for the pixel 110.

As described above, in the third embodiment,
Different from the first embodiment, the subfield periods sf1 to sf5 forming the frame period (1F) shown in FIGS. 8A and 8B have different weights, but the two subfield periods sf1 to sf5 shown in FIG. Similar to the first embodiment, the relationship between the correspondences is defined based on the cycle of the brightness change of the light source. Therefore, similarly to the first embodiment, deterioration of image quality such as flicker is reduced. It becomes possible to do.

[Fourth Embodiment] A fourth embodiment will be described. The electronic device of the fourth embodiment is the first
It has the configurations of the first to third embodiments.

FIG. 11 shows the configuration of the electronic equipment of the fourth embodiment. As shown in FIG. 11, the electronic device 1000 mainly controls the electro-optical device 1 described in the first to third embodiments and the operation of the electronic device 1000 as a whole. Device 2000 and the electronic device 10
00 is configured by a power supply device 3000 that supplies electric power to the whole. Typical electronic devices include projectors, mobile computers, and mobile phones.

Although an external light source such as an indoor fluorescent lamp is taken as an example of the light source, other light sources include a backlight of a liquid crystal display device, a front light, a light source of a liquid crystal projector, and the like.

[0040]

As described above, according to the driving method of the electro-optical element according to the present invention, the pixels belonging to at least two groups are defined in consideration of the cycle in which the brightness of the light source changes. Since the sub-field period for driving the pixel to be turned on is determined according to the rules for the two groups, the sub-field period for driving the liquid crystal to be turned on within the frame period is the same as in the conventional case. It is possible to suppress the deterioration of the image quality such as flicker, which is caused by the fact that the luminance of the light source in each frame period is different for each frame period.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an electro-optical device according to a first embodiment.

FIG. 2 is a diagram showing division of pixels according to the first embodiment.

FIG. 3 is a diagram showing a correspondence relationship between gradations and subfield periods to be driven according to the first embodiment.

FIG. 4 is a diagram showing a truth table according to the first embodiment.

FIG. 5 is a diagram showing another pixel division according to the first embodiment.

FIG. 6 is a diagram showing pixel division according to the second embodiment.

FIG. 7 is a diagram showing a correspondence relationship between gradations and subfield periods to be driven according to the second embodiment.

FIG. 8 is a diagram showing a correspondence relationship between gradations and subfield periods to be driven in the third embodiment.

FIG. 9 is a diagram showing another correspondence relationship between gradations and subfield periods to be driven in the third embodiment.

FIG. 10 is a diagram showing still another correspondence relationship between gradations and subfield periods to be driven according to the third embodiment.

FIG. 11 is a diagram showing a configuration of an electronic device according to a fourth embodiment.

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Claims (7)

[Claims] 1. Using a light source whose brightness changes periodically,
Each sub-field period is a unit time for driving each of the electro-optical elements according to grayscale data that defines multiple grayscales to be displayed by each of the plurality of electro-optical elements arranged in a matrix, and By controlling the progress of the light from the light source by driving each electro-optical element during a sub-field period corresponding to the grayscale data among a plurality of sub-field periods configuring a frame period, each electro-optical element is controlled. A method of driving an electro-optical element for displaying the gradation on an element, comprising: at least two groups, each group including a part of the plurality of electro-optical elements. Of the plurality of subfield periods for one electro-optical element included in the one group, the one for the one electro-optical element. A subfield period corresponding to the grayscale data is selected according to a first rule which defines a correspondence relationship between each grayscale of the multilevel grayscale and a position of the subfield period to be selected corresponding to each grayscale. 1
Of the plurality of subfield periods for the one electro-optical element included in the other one group other than the one group of the at least two groups A second subfield period corresponding to the grayscale data for the one electro-optical element, the second subfield period defining a relationship between each grayscale and a position of the subfield period to be selected corresponding to the grayscale. As a rule, the correspondence between the position of the subfield period selected under the first rule and the position of the subfield period selected under the second rule for the same gradation is determined by the luminance of the light source. During the subfield period selected by the second selection step selected according to the second rule defined in relation to the cycle in which One A first driving step of driving the aero-optical element, and a second driving step of driving the one electro-optical element included in the one other group during the subfield period selected in the second selecting step. And a driving step for driving the electro-optical element. 2. A plurality of scanning lines and a plurality of signal lines intersect with the positions of the plurality of electro-optical elements, and the one electro-optical element included in the one group is arranged in one scanning line. One of the electro-optical elements provided along the scanning line, the one electro-optical element included in the other one group is provided along another scanning line adjacent to the one scanning line. 2. The method of driving an electro-optical element according to claim 1, which is one of the electro-optical elements. 3. A plurality of scanning lines and a plurality of signal lines intersect the positions of the plurality of electro-optical elements, and the one electro-optical element included in the one group is connected to one signal line. One of the electro-optical elements provided along the line, the one electro-optical element included in the other one group is provided along another signal line adjacent to the one signal line. 2. The method of driving an electro-optical element according to claim 1, which is one of the electro-optical elements. 4. A plurality of scanning lines and a plurality of signal lines intersect at the positions of the plurality of electro-optical elements, and the one electro-optical element included in the one group and the other group 2. The method of driving an electro-optical element according to claim 1, wherein the one electro-optical element included in [1] is not adjacent to each other in the same scanning line and the same signal line direction. 5. The method of driving an electro-optical element according to claim 1, wherein the correspondence defined by the second rule is approximately one quarter of a cycle in which the brightness of the light source changes. . 6. Using a light source whose brightness changes periodically,
Each sub-field period is a unit time for driving each of the electro-optical elements according to grayscale data that defines multiple grayscales to be displayed by each of the plurality of electro-optical elements arranged in a matrix, and By controlling the progress of the light from the light source by driving each electro-optical element during a sub-field period corresponding to the grayscale data among a plurality of sub-field periods configuring a frame period, each electro-optical element is controlled. A driving device of an electro-optical element for displaying the gradation in an element, wherein at least two groups, each group including a part of the plurality of electro-optical elements, Of the plurality of subfield periods for one electro-optical element included in the one group, the one for the one electro-optical element. A subfield period corresponding to the grayscale data is selected according to a first rule which defines a correspondence relationship between each grayscale of the multilevel grayscale and a position of the subfield period to be selected corresponding to each grayscale. 1
Of the plurality of sub-field periods for the one electro-optical element included in the other one group other than the one group of the selection unit of the at least two groups. A second subfield period corresponding to the grayscale data for the one electro-optical element, the second subfield period defining a relationship between each grayscale and a position of the subfield period to be selected corresponding to the grayscale. As a rule, the correspondence between the position of the subfield period selected under the first rule and the position of the subfield period selected under the second rule for the same gradation is determined by the luminance of the light source. A second selection unit that selects according to the second rule that is defined in relation to a cycle in which the change occurs, and the subfield period that is selected by the first selection unit, that is included in the one group. Drives one electro-optical element A first driving unit for driving the one electro-optical element included in the other one group during the subfield period selected by the second selecting unit. A driving device for an electro-optical element, comprising: 7. An electronic apparatus comprising the driving device for the electro-optical element according to claim 6.