JPH10115834A - Liquid crystal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crysatal device capable of obtaining high picture quality at high productivity. SOLUTION: Scan electrodes S1-S1024 are divided, and division scan electrodes are formed, and plural division pixels constituting pixels are formed on intersected parts between these division scan electrodes and information electrodes I1-I1280, and a scan signal is applied to respective division scan electrodes by scan signal application means S1a, S1-S1024a, S1024b of signal application parts DS1-DS1024. Then, by alternately arranging these signal application parts DS1-DS1024 on both sides of plural scan electrodes S1-S1024, a temp. distribution is reduced, and display unevenness is made hardly to occur. Further, when the scan signal is applied to two division scan electrodes simultaneously according to a display mode, by arranging simultaneously selected two signal application parts DS1-DS1024 on the sides different from each other of the scan electrodes S1-S1024, the temp. distribution is reduced to prevent the occurrence of display unevenness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various liquid crystal devices used for a display for a computer, a television receiver for home use, a monitor for various controls, and the like, and in particular, a display for displaying an image by divided pixels obtained by dividing pixels. It relates to the one provided with a part.

[0002]

2. Description of the Related Art In a conventional liquid crystal device, as a method of realizing multiple gradations, for example, there is a method of obtaining a desired luminance level by controlling an applied voltage to each pixel according to an applied voltage-transmittance curve. This method is used in an active matrix LCD using a TN liquid crystal. In addition, as for the highly electric chiral smectic liquid crystal, U
SP-4,712,877, USP-4,796,98
0, USP-4,776,676 and the like.

As another method, one frame scan is divided into several sub-frame scans, and the on / o
There is a method of performing multi-tone display by time-modulating ff, and this method is described in US Pat. No. 4,709,995 and the like. Note that this method complicates the circuit and requires high-speed scanning from the viewpoint of flicker suppression.
The load on the display element and peripheral circuits is increased, and there is a problem such as an increase in cost.

On the other hand, as another method for realizing multiple gradations, one pixel is divided to form divided pixels having several different areas (hereinafter referred to as sub-pixels).
There is a method of lighting various patterns by controlling n / off. This method is described in EP-26.
1,898 and EP-453,033.

A specific example of the gradation display method using the sub-pixels will be described with reference to the drawings. FIG. 15 shows an example in which one pixel is divided so as to have an area ratio of 8: 4: 2: 1. FIG. 15A shows one pixel 20 divided vertically by 4: 1,
Each of the sub-pixels 20a and 20
The area of b, 20c, 20d is divided into 8: 4: 2: 1. Then, one pixel 20 is divided as described above, and a predetermined electric signal is applied to each of the sub-pixels 20a, 20b, 20c, and 20d by the drivers S1, S2, I1, and I2, thereby forming the sub-pixels 20a, 20b, 20c, and 20d. By performing on / off control independently, it is possible to express 16 gray levels.

FIG. 1 (b) shows an improvement in the above. The pixel 20 is divided into 2: 1: 2 in the vertical direction and 1: 1: 1 in the horizontal direction. The sub-pixels 20a, 20b, 20c, and 20d have an electrode configuration such that an electric signal is simultaneously applied thereto. Here, for example, the area corresponding to the two scanning drivers S1 and S2 is 4: 1 as in FIG.
Since the area corresponding to 1, I2 is 2: 1, a sub-pixel having an area ratio of 8: 4: 2: 1 is obtained as in the pixel configuration of FIG. In this display method, when each gradation is displayed, there is an advantage that a smoother gradation display can be performed because the optical center of gravity does not move.

In FIG. 1C, there is no division in the vertical direction, but only in the horizontal direction, and an area ratio of 8: 4: 2: 1 is given to the sub-pixels 20a, 20b, 20c and 20d. But,
In this method, when performing gradation display, image quality is degraded due to the movement of the optical center of gravity in each pixel, and the horizontal division density is increased. For example, the aperture ratio is reduced, and particularly, the mounting density in the horizontal direction is reduced. There is a productivity problem such as an increase.

From this, it can be seen that when dividing one pixel, it is useful to divide both the vertical and horizontal sides of the pixel as shown in (a) and (b) in view of productivity and performance.

On the other hand, FIG. 16 shows an example of a gradation display in a color display, and FIG.
The arrangement of each color R, G, B in (b), (c),
(D) shows a method of dividing each of the colors R, G, and B into sub-pixels. In this division method, both the vertical and horizontal sides of each pixel are divided so that each color R, G, B has 16 gradations.

[0010] That is, (b) is a simple division method similar to that shown in (a) of FIG. 15, (c) is a method in which the movement of the center of gravity in only the vertical direction is eliminated, and (d) is a sub-division in which the movement of the center of gravity in both the vertical and horizontal directions is eliminated. It has a pixel arrangement. With such a pixel arrangement, 409 pixels per pixel at 16 gradations (4 bits) for each color.
Display of six colors (12 bits) becomes possible.

Note that these are merely examples, and when a larger number of colors is required, the number of divisions may be increased. In the case of a color display, 12 bits / pixel may be used.
96 color display, about 32,000 colors can be obtained at 15 bits / pixel, and about 16.8 million pixels can be obtained at 24 bits / pixel.

[0012]

By the way, in a conventional liquid crystal device having such a structure, for example, FIG.
In the case of adopting the division method shown in FIG.
In order to perform the n / off control, for example, it is necessary to divide a scanning electrode to which a scanning signal is applied into two.

[0013] Here, when the scanning electrode is divided into two parts, the number of the scanning electrodes is substantially doubled. Therefore, in order to suppress flicker and variation of a moving image, the liquid crystal device requires a higher speed. Driving is required. However, when the liquid crystal display is driven at such a high speed, the temperature distribution of the liquid crystal display becomes large, and there is a problem that display unevenness occurs in the liquid crystal display.

On the other hand, the liquid crystal device is required to have several display modes in which the resolution is converted. However, when the resolution is converted in this way, high image quality and excellent productivity are required. Is required.

Accordingly, the present invention has been made to solve such problems and needs, and has as its object to provide a liquid crystal device having high image quality and high productivity.

[0016]

According to the present invention, there is provided a liquid crystal device having a display section having a plurality of pixels formed at intersections of a plurality of scanning electrodes and information electrodes formed in a matrix. A divided scanning electrode formed by dividing an electrode, a plurality of divided pixels formed at the intersection of the divided scanning electrode and the information electrode and constituting the pixel, and a scanning signal is applied to each of the divided scanning electrodes. A signal applying unit having a scanning signal applying unit for applying the signal, wherein the signal applying units are alternately arranged on both sides of the plurality of scanning electrodes.

Further, the present invention is characterized in that each of the divided scanning electrodes is divided so as to have a different area.

According to the present invention, there is provided a display unit having a plurality of pixels formed at intersections of a plurality of scanning electrodes and information electrodes formed in a matrix, and during one scanning period according to a display mode. In a liquid crystal device configured to simultaneously apply a scanning signal to two scanning electrodes, a divided scanning electrode formed by dividing the scanning electrode and an intersection of the divided scanning electrode and the information electrode are formed. A plurality of divided pixels constituting the pixel together with, a signal application unit having a scanning signal application unit that is arranged alternately on both sides of the scanning electrode, and applies a scanning signal to each of the divided scanning electrodes,
A signal application unit selection unit that selects the two signal application units so as to simultaneously apply a scan signal to the two divided scan electrodes according to the display mode, and is simultaneously selected according to the display mode. The two signal applying units are arranged on different sides of the scanning electrode from each other.

Further, the present invention is characterized in that each of the divided scanning electrodes is divided so as to have a different area, and the separated scanning electrodes to which the scanning signals are simultaneously applied have the same area. .

Further, the present invention is characterized in that the liquid crystal sandwiched between the opposed substrates and driven by the divided scanning electrodes and the information electrodes optically shows two states.

Further, in the present invention, the liquid crystal is a ferroelectric liquid crystal.

Further, the present invention is characterized in that the liquid crystal is a chiral nematic liquid crystal.

Further, the present invention is characterized in that the display section displays a plurality of display modes by changing the number of pixels or the pixel size.

Further, the divided scanning electrodes are formed by dividing the scanning electrodes as described above, and a plurality of divided pixels constituting pixels are formed at intersections of the divided scanning electrodes and the information electrodes. The scanning signal is applied to each of the divided scanning electrodes by the scanning signal applying means. And
By arranging the signal applying units alternately on both sides of the plurality of scanning electrodes, the temperature distribution is reduced so that display unevenness does not occur.

In a liquid crystal device in which a scanning signal is simultaneously applied to two scanning electrodes during one scanning period in accordance with a display mode, a signal applying portion is alternately arranged on both sides of the scanning electrode. By selecting two signal applying units in the signal applying unit selecting unit, a scanning signal is simultaneously applied to two divided scanning electrodes according to the display mode. By arranging two signal applying units simultaneously selected in accordance with the display mode on different sides of the scanning electrode, the temperature distribution is reduced to prevent display unevenness.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a liquid crystal device according to the first embodiment of the present invention. Referring to FIG. 1, reference numeral 1 denotes a graphic controller having a VRAM 1a for storing image information. After being converted into line address data and display data, they are input to the scanning signal driver 5 and the information signal driver 7.

The scanning signal driver 5 to which the scanning line address data is input generates a scanning selection signal as shown in FIG. To be applied. The information signal driver 7 to which the display data is input generates an information signal as shown in FIG. 6 and the like, which will be described later, according to the display data, and applies the information signal to the information electrode I of the liquid crystal display unit 6.

On the other hand, reference numeral 8 denotes a drive voltage generation circuit for applying a drive voltage to the scanning signal driver 5 and the information signal driver 7, and 9 denotes a temperature sensor for detecting the temperature of the liquid crystal display unit 6. The temperature information from the temperature sensor 9 is input to the drive control circuit 2, and the drive control circuit 2 determines drive conditions based on the temperature information.

The specification of the liquid crystal display section 6 is 1 pixel.
280 × 1024, pixel pitch 230 μm, number of colors 409
There are 6 colors / pixel (12 bits / pixel), and the pixel division method is a method of eliminating the shift of the center of gravity of the pixel only in the vertical direction (FIG. 16).
(See (c)).

Further, the liquid crystal display section 6 uses a ferroelectric liquid crystal showing two optical states as an optical medium. In the present embodiment, a chiral material is added to a phenylpyrimidine liquid crystal to obtain the following. The liquid crystal prepared as described above is used.

Spontaneous polarization: 10 nC / cm 2 Experimental temperature 40 ° C. Cell thickness 1.5 μm At this point, the liquid crystal display unit 6 has a stripe-shaped scanning electrode S and an information electrode I formed in a matrix as shown in FIG. And the intersection of the scanning electrode S and the information electrode I is a pixel 20. The number of the scanning electrodes S is 1024 as shown in FIG.
Although the main electrodes are formed, the scanning electrodes S1 to S1024 and the information electrodes I1 to I1280 are non-uniformly divided in order to express a gray scale.

Further, in this embodiment, each pixel 2
0 is divided into three primary colors of RGB as shown in FIG. 4, the information electrode In divides each color R, G, B into 2: 1 into two, and the scanning electrode Sn is divided into gradations. Each color R, G, B so that the center of gravity of the display does not move optically.
Is divided into 2: 1: 2. The number of colors that can be displayed by this configuration is 12 bits / pixel, that is, 4096 colors / pixel.

In the figure, DSn is a scan driver which is an n-th signal applying section for applying a scan signal to the n-th scan electrode Sn.
Has divided drivers Sna and Snb which are two scanning signal applying means for applying a scanning signal to each divided scanning electrode Sn1 and Sn2 of the n-th divided scanning electrode Sn. DIn is an n-th information driver for applying an information signal to the n-th information electrode In, and this scanning driver DIn is composed of six divided drivers Ia for applying an information signal to the divided n-th information electrode In. , Ib,
Ic, Id, Ie, If.

By the way, as for the ferroelectric liquid crystal, as shown in FIG. 5, since the optimum driving range greatly changes depending on the temperature, display unevenness occurs when a temperature distribution occurs. When such display unevenness occurs, the display quality is fatally affected.

Therefore, in the present embodiment, as shown in FIG. 3, the scanning drivers DS1 to DS1024 are alternately arranged on both sides of the scanning electrodes S1 to S1024 facing each other. D
By arranging S1024, the temperature distribution of the liquid crystal display unit 6 is reduced so that good image quality can be obtained.

In this embodiment, the information drivers DI1 to DI1280 are alternately arranged on both sides of the information electrodes I1 to I1280 as shown in FIG. It is also possible to arrange on the side.

FIG. 6 shows an example of a driving waveform applied to each electrode when the liquid crystal device having such a configuration is driven for an experiment. The scanning signal Ps is applied to the scanning electrode S in a line-sequential manner.
1 to S1024, and in synchronization therewith, a desired information signal Pi is applied to the information electrodes I1 to I1280.

In the experiment, the scanning signal voltage Vs was set to ± 18 V, the information signal voltage Vi was set to ± 5 V, and the drive waveform was such that the next line was once erased while selecting the previous line and writing information. The one-line preceding erase-line write method was adopted. Note that this waveform is 1
This is one example, and it goes without saying that the present invention can be applied to any driving method that can write a desired image.

Further, in the experiment, in the case of a ferroelectric liquid crystal, since the temperature dependence of the driving conditions is large, the temperature sensor 9
(See FIG. 1), the driving conditions are determined based on the data. In addition, the same effect can be obtained by changing the driving conditions from outside so that the user can select the driving conditions.

Further, in order to obtain a smooth and comfortable display, according to another experiment conducted by us, 2
A frame frequency of 0 Hz or more is required. Although this is restricted by the speed of the liquid crystal material and the driving voltage, in the present embodiment, the experiment was performed at 20 Hz.
In order to set the frame frequency to 20 Hz, one line access time (1H) requires 24 μsec.

Further, metal wiring (aluminum electrode height: 200 nm, width: 10 μm) is provided at the end of each scanning / information electrode so that the driving signal does not cause a waveform delay to cause display unevenness, thereby reducing the resistance of the wiring. did.

As a result of conducting a driving experiment of the liquid crystal device under such conditions, a temperature distribution as shown in FIG. However, this temperature distribution was 8 degrees, and with such a temperature distribution, good image quality was obtained without the influence of display unevenness.

It is to be noted that such a temperature distribution is obtained by driving a large-area, high-capacity load liquid crystal element in response to an information signal Pi consisting of a rectangular signal shown in FIG. Although a discharge current flows, most of the charge / discharge current is generated because Joule heat is consumed by resistance of the electrode wiring portion.

FIG. 8 shows information drivers DI1 to DI
FIG. 13 is a diagram illustrating a comparative example with respect to the present embodiment in which both the 1280 and the scanning drivers DS1 to DS1024 are arranged on one side of the liquid crystal display unit 6; The temperature distribution in this comparative example is as shown in FIG. 9, and this temperature distribution is 16 degrees when compared under the same driving conditions as in the first embodiment.
When various other variations were also included, those variations could not be absorbed under the driving conditions, and a desired display could not be performed on the entire screen. For example, when the driving conditions were adjusted to the low temperature part, sufficient contrast could not be obtained in the high temperature part.

As described above, the scan drivers DS1 to DS
1024 are alternately arranged on both opposing sides of the scanning electrodes S1 to S1024, so that the divided scanning electrodes S1 to S1024 are divided.
Even when a high-frequency drive waveform is applied to each of the divided scanning electrodes Sn1 and Sn2 (see FIG. 4) in S1024, the temperature distribution can be reduced, and high image quality can be obtained.

Next, a description will be given of a second embodiment of the present invention in which the resolution is changed in order to display several display modes. In the present embodiment, the liquid crystal display unit 6 shown in FIG. 1 similar to the first embodiment is used.

Here, this 1280 × 1024 (SXG
A) The resolution is reduced by half from the high definition mode to 640 × 5
Consider the case of displaying the 12-pixel display mode.

In this case, 1280 × 1024 pixels (SX
GA), 2 × 2 pixels are driven as if they were one VGA pixel. In this case, the number of displayable pixels is six.
It becomes 40 × 512, and the 640 × 480 (VGA) mode can be displayed almost completely on the screen by reducing the resolution of SXGA to half.

In a pixel having such a configuration, two of the scan electrodes S1 to S1024 can be simultaneously driven to drive at high speed. Here, considering one screen rewriting time, high definition mode: one screen rewriting time = lH × 2 × 102
4 Medium-definition mode: One screen rewriting time = lH × 1024, and when 2 × 2 pixels are regarded as one pixel, the rewriting speed of the medium-definition mode is twice that of the high-definition mode by simultaneously driving two scanning electrodes. It is effective.

Here, the following two methods can be considered as a method of simultaneously driving the two scanning electrodes S1 to S1024.

One of them is that, as shown in FIG. 10, S1a and S1b of the first scan driver DS1, S2a and S2b of the second scan driver DS2 apply to each of the divided scanning electrodes (see FIG. 4) for each pixel. S3a and S3 of the third scan driver DS3
3b are simultaneously driven to apply the scanning signal Ps (hereinafter, referred to as “ab simultaneous driving”).

In this case, considering the number of colors per 2 × 2 pixels that can be displayed, the scanning signal Ps is applied to the two divided scanning electrodes at the same time. Four levels of gradation are possible. Therefore, the number of gradation levels that can be displayed by a total of four pixels of 2 × 2 pixels is 13 (= 3 × 4 + 1), and 2 × 2 pixels are obtained by this driving method.
Number of colors that can be displayed by two pixels is 2197 colors (= 13 ^3).

However, the number of colors (2,197 colors) is inferior to 4096 colors per pixel in the first place, and the resolution is reduced by half, so that the image quality is remarkably deteriorated and cannot be satisfied as a product.

On the other hand, the other one is “aa” shown in FIG.
/ B-b simultaneous drive ". This is because two lines of the thick scanning electrodes shown in FIGS. 3 and 4 are simultaneously scanned (simultaneously driving aa), and then two lines of the thin scanning electrodes are simultaneously scanned (b-a).
b simultaneous driving).

Then, in the case of this method, 2 × 2
When the number of colors of pixels is calculated, the number of gradation levels of each color is 31 (= 15 × 2 + 1) with 2 × 2 pixels because 2 × 1 pixels on the left and right have gradations of 0 to 15 levels, respectively. The number of colors that can be represented by 2 × 2 pixels with levels is 22,9791
Color (= 31 ³ ).

Therefore, in comparison with the above-mentioned scanning method, "a-
"b / ab simultaneous driving" to "simultaneous driving of aa / bb"
Has improved the number of colors that can be expressed by 2 × 2 pixels ten times or more.

From the above, when displaying the low-resolution mode on the high-resolution liquid crystal device, it is possible to obtain a high-quality image if the driving is performed by "simultaneous driving of aa / bb". Is evident.

Then, such a liquid crystal device is referred to as “aa /
The case of driving by “b-b simultaneous driving” will be described with the configuration of FIG. 3 described above.

FIG. 11 shows an example of a driving waveform for driving the liquid crystal device. The scanning signal Ps of the driving waveform is simultaneously and sequentially applied to the scanning electrodes S1 to S1024 from above via the scanning drivers DS1 to DS1024. Apply it. The divided drivers that are driven simultaneously are summarized below.

That is, S of the first scanning driver DS1 on the left side
1a and S2a of the second scanning driver DS2 on the right side, S1b of the first scanning driver DS1 on the left side and S2b of the second scanning driver DS2 on the right side, and S3a of the third scanning driver DS3 on the left side and the fourth scanning driver DS4 on the right side. S4a, ...
.. S of the 1023th scanning driver DS1023 on the left side
1023b and the 1024th scan driver DS102 on the right side
4 in the order of S1024b.

As a comparative example of the present embodiment, when considering the case of realizing the driving shown in FIG. 10 with the configuration of FIG. 8, in this comparative example, it is necessary to drive distant lines at the same time. There is a drawback that the logic of the control system including it becomes complicated. Also, as shown in FIG.
It is necessary to simultaneously apply Sla-S2a separated by a line, which is a function not provided in a general liquid crystal driver. Therefore, the cost is increased due to the addition of the logic circuit. At the same time, similarly to the comparative example in the first embodiment described above, even in the medium definition mode, display unevenness due to temperature unevenness occurs, and a problem arises in that good image quality cannot be obtained.

As is clear from the comparison with this comparative example, the scan drivers DS1 to DS1024 are connected to the scan electrodes S.
By arranging on both sides of 1 to S1024, multicolor and high-speed display is possible, and the temperature distribution is suppressed to 8 degrees as shown in FIG. 7, so that a high-quality image without display unevenness is obtained. be able to.

Further, according to the present embodiment, the same operation can be performed simply by synchronizing the scanning drivers DS1 to DS1024 arranged on the left and right sides. There is no complication. When the display mode is changed, a signal application unit that selects two scan drivers DS1 to DS1024 so as to simultaneously apply a scan signal to two divided scan electrodes Sn1 and Sn2 (see FIG. 4) according to the display mode. Since a large load is not applied to the drive control circuit 2 as the selection unit, the control system can be simplified, and the productivity is increased at low cost.

Next, a description will be given of a third embodiment in which the scanning order for applying the scanning signal according to the second embodiment is changed.

In this embodiment, as in the case of the first embodiment, "aa"
/ Bb-simultaneous driving ", but the vertical scanning is divided into first and second fields as shown in FIG.
In the field, Sla and S2a, S3a and S4a, S
5a and S6a, S7a and S8a,... S1023a and S1024a are simultaneously driven.

In the second field, Slb and S2
b, S3b and S4b, S5b and S6b, S7b and S8
,..., S1023b and S1024b are simultaneously driven.

By driving in this manner, the "Sxa" line corresponding to the upper bits is preferentially rewritten, so that the moving image is smoothly rewritten and good image quality is obtained.

Next, a description will be given of a fourth embodiment in which the scanning order of the third embodiment has been changed.

In this embodiment, the scanning order of each field is as follows.

That is, in the first field, S1a and S2
a, S7a and S8a, S13a and S14a,... in the second field, S3a and S4a, S9a and S10a,
S15a and S16a,..., In the third field, S5
a and S6a, S11a and S12a, S17a and S18
a,..., in the fourth field, S1b and S2b, S7
b and S8b, S13b and S14b,... in the fifth field, S3b and S4b, S9b and S10b, S15b
, S16b,..., In the sixth field, S5b and S6
b, S11b and S12b, S17b and S18b ...
・ 、.

As described above, by forming one frame with six fields by scanning while skipping the scanning electrode to be scanned, a high-quality image with no flicker and a smooth moving image can be obtained even when the frame frequency is low. Obtainable. In addition, the order of each field can be changed, and in this case, good image quality can be obtained.

Next, a fifth embodiment of the present invention using a chiral nematic liquid crystal will be described.

In this embodiment, a chiral nematic liquid crystal is used as a liquid crystal sandwiched between a pair of substrates facing each other in the liquid crystal device and showing two optically stable states. Details of the principle of the liquid crystal element are described in JP-A-6-230751, JP-A-7-1755041, and the like.

The nematic liquid crystal was prepared to have a helical pitch of 3.6 μm by adding an optical activator (manufactured by Merck) to commercially available liquid crystal materials KN and 4000 (manufactured by Chisso Corporation). Cell is polyimide 100n
m, and rubbed so as to be antiparallel to each other to make the cell thickness 2 μm. This liquid crystal device was able to write desired information with a reset pulse voltage of ± 20 V, a writing voltage of ± 2.5 V, and an information signal voltage of ± 1.5 V (one line access time of 300 μs).

When the above-described "a / a / b-b simultaneous driving" is performed on the liquid crystal element having such a configuration using the driving waveforms shown in FIGS. 13 and 14, a good image quality is obtained. Was.

Also in this liquid crystal device, the high-definition mode in which all the scanning lines are independently scanned and the "a-a"
/ B-b simultaneous driving ", it is possible to perform display corresponding to each definition.

Also in such a liquid crystal device, the temperature dependence of the driving conditions is strong, the driving margin is improved by arranging the scanning drivers on both sides, the control system can be simplified, and a liquid crystal device with high productivity can be obtained. I was able to.

[0079]

As described above, according to the present invention, the signal applying section having the scanning signal applying means for applying the scanning signal to the divided scanning electrodes forming the divided pixels is alternately provided on both sides of the plurality of scanning electrodes. By arranging, the temperature distribution can be reduced to prevent display unevenness,
This makes it possible to realize a liquid crystal device with high image quality and high productivity with a simplified control system.

In a liquid crystal device in which a scanning signal is simultaneously applied to two scanning electrodes during one scanning period in accordance with a display mode, the signal applying portions may be arranged on different sides of the scanning electrodes. Accordingly, the temperature distribution can be reduced to prevent display unevenness, and a liquid crystal device with high image quality and high productivity can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of a liquid crystal device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing matrix electrodes and pixels of a liquid crystal display portion of the liquid crystal device.

FIG. 3 is a diagram showing a structure of the liquid crystal display unit.

FIG. 4 is a diagram showing a structure of one pixel of the liquid crystal display unit.

FIG. 5 is a diagram showing a relationship between an optimum driving range and a temperature in a ferroelectric liquid crystal of the liquid crystal display unit.

FIG. 6 is a diagram showing an example of a driving waveform applied to the liquid crystal device.

FIG. 7 is a diagram showing a temperature distribution in the liquid crystal device.

FIG. 8 is a diagram illustrating a structure of a liquid crystal display unit according to a comparative example in the present embodiment.

FIG. 9 is a diagram showing a temperature distribution in the liquid crystal device of the comparative example.

FIG. 10 is a diagram showing a method for simultaneously driving two scanning electrodes of a liquid crystal device according to a second embodiment of the present invention.

FIG. 11 is a diagram showing another method for simultaneously driving two scanning electrodes of the liquid crystal device.

FIG. 12 is a diagram illustrating a method for simultaneously driving two scanning electrodes of a liquid crystal device according to a third embodiment of the present invention.

FIG. 13 is a view showing a method for simultaneously driving two scanning electrodes of a liquid crystal device according to a fifth embodiment of the present invention.

FIG. 14 is a diagram showing another method for simultaneously driving two scanning electrodes of the liquid crystal device.

FIG. 15 is a diagram showing an example of pixel division for gradation display.

FIG. 16 is a diagram showing an example of gradation display in color display.

[Explanation of symbols]

 2 Drive control circuit 5 Scan signal driver 7 Information signal driver 6 Liquid crystal display unit 20 Pixel S, S1 to S1024 Scan electrode I, I1 to I1280 Information electrode Sn1, Sn2 Split scan electrode DSn Scan driver Sna, Snb Split driver 20a, 20b, 20c, 20d sub-pixel

Continuation of the front page (72) Inventor Gaku Iwasaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Hidemasa Mizutani 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inside the corporation

Claims (8)

[Claims] 1. A liquid crystal device having a display section having a large number of pixels formed at intersections between a plurality of scanning electrodes and information electrodes formed in a matrix, wherein the scanning electrodes are formed by dividing the scanning electrodes. A divided scanning electrode; a plurality of divided pixels which are formed at intersections of the divided scanning electrodes and the information electrodes and constitute the pixels; and a scanning signal applying means for applying a scanning signal to each of the divided scanning electrodes. And a signal applying unit, wherein the signal applying units are alternately arranged on both sides of the plurality of scanning electrodes. 2. The liquid crystal device according to claim 1, wherein each of said divided scanning electrodes is divided so as to have a different area. 3. A display section having a plurality of pixels formed at intersections of a plurality of scanning electrodes and information electrodes formed in a matrix, and two scans during one scan period according to a display mode. In a liquid crystal device configured to simultaneously apply a scanning signal to an electrode, a divided scanning electrode formed by dividing the scanning electrode; and a pixel formed at an intersection of the divided scanning electrode and the information electrode. A plurality of divided pixels, a signal applying unit having scanning signal applying means alternately arranged on both sides of the scanning electrode, and applying a scanning signal to each of the divided scanning electrodes, and 2 according to the display mode. And a signal applying unit selecting unit that selects the two signal applying units so as to simultaneously apply a scanning signal to the two divided scanning electrodes. The liquid crystal device, wherein the two signal applying units are arranged on different sides of the scanning electrode. 4. The liquid crystal according to claim 3, wherein each of the divided scan electrodes is divided so as to have a different area, and the separate scan electrodes to which the scan signals are simultaneously applied have the same area. apparatus. 5. While being sandwiched between the opposed substrates,
4. The liquid crystal device according to claim 1, wherein the liquid crystal driven by the divided scanning electrode and the information electrode optically shows two states. 6. The liquid crystal device according to claim 5, wherein the liquid crystal is a ferroelectric liquid crystal. 7. The liquid crystal device according to claim 5, wherein the liquid crystal is a chiral nematic liquid crystal. 8. The liquid crystal device according to claim 3, wherein the display unit displays a plurality of display modes by changing the number of pixels or the pixel size.