CN110955089A

CN110955089A - Liquid crystal display with self-compensating electrode pattern

Info

Publication number: CN110955089A
Application number: CN201811128380.1A
Authority: CN
Inventors: 彭政忠; 沈毓仁
Original assignee: VastView Technology Inc
Current assignee: VastView Technology Inc
Priority date: 2018-09-27
Filing date: 2018-09-27
Publication date: 2020-04-03

Abstract

A liquid crystal display (LCD device) including a self-compensating Indium Tin Oxide (ITO) electrode pattern, wherein each pixel region includes at least one sub-pixel region formed with the self-compensating electrode pattern, and at least an even number of slits are formed on the electrode pattern, an extending direction of each slit being parallel or forming an angle with respect to a data line of the pixel region. Each pixel region may also include two sub-pixel regions, and each sub-pixel region is formed with a self-compensating electrode pattern having at least an even number of slits. The self-compensating electrode pattern in one sub-pixel region may be the same as or different from the self-compensating electrode pattern in another sub-pixel region.

Description

Liquid crystal display with self-compensating electrode pattern

Technical Field

The present invention relates to a Liquid Crystal Display (LCD) device, and more particularly, to a liquid crystal display device having a self-compensating Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO) electrode pattern for improving display quality.

Background

One characteristic of liquid crystal molecules is that they have different optical orientations or different refractive effects when aligned differently. The liquid crystal display uses this characteristic to control the light transmittance to generate an image. The twisted nematic liquid crystal display has good light transmittance due to the structure of liquid crystal molecules and the influence of optical characteristics, but the viewing angle of the display is very narrow.

To solve the problems of light transmittance and viewing angle, the twisted vertical alignment mode is used to improve the light transmittance and increase the viewing angle. Since the liquid crystal molecules are vertically aligned, when the liquid crystal molecules receive a lower voltage, the display is viewed in an oblique direction, which causes a problem of gray scale inversion. Thereby generating color shift in the oblique viewing direction and making the display unable to display normal images.

One solution to this problem is to form two or more liquid crystal molecule alignment blocks in the same pixel to form a multi-domain vertical alignment liquid crystal display, so as to eliminate the gray scale inversion problem and improve the viewing angle. In practice, there are three specific methods. In the first method, each pixel is divided into a plurality of display regions, and each display region forms a different voltage by using capacitive coupling, thereby generating a display effect of multi-domain liquid crystal molecular alignment. In the second method, each pixel is divided into a plurality of display regions, and two thin film transistors are used to make each display region have different voltages, thereby solving the gray scale inversion problem. In the third method, each pixel is divided into two or more display regions, and an electron blocking material is covered on a portion of the electrodes of the display regions, thereby producing a multi-domain liquid crystal molecular alignment display effect.

However, these prior art approaches to solving the gray scale inversion problem require complicated LCD manufacturing processes. In view of the foregoing, the present invention provides a simple electrode structure for driving a liquid crystal display and providing a wider viewing angle, so that the liquid crystal display can display an optimal image.

Disclosure of Invention

The present invention provides a liquid crystal display having improved display quality at a wide viewing angle. In order to compensate the characteristics of the voltage and the associated normalized transmittance (V-T) curve of the LCD in the off-axis direction, a self-compensating electrode pattern is designed in each pixel region of the LCD to increase the viewing angle.

In a preferred embodiment of the present invention, at least two sub-pixel regions in each pixel region of the liquid crystal display have different indium tin oxide or indium zinc oxide electrode patterns. Each sub-pixel region within the pixel region includes at least two electrodes, each electrode being a solid electrode having a polygonal shape. In other words, the polygonal-shaped electrode has no slit gap on its electrode pattern. The two solid electrodes in the sub-pixel region are electrically connected to each other.

In an example of the present invention, the two solid electrodes in each sub-pixel region are electrically connected to each other by electrode segments, and the electrode segments and the two solid electrodes are disposed on the same layer of electrode structure. In another example, the two solid electrodes in each sub-pixel region are also connected to the solid electrode by electrode segments, so as to form electrode structures electrically connected to each other, but the electrode segments and the two solid electrodes are disposed on different layers.

According to an embodiment of the present invention, the electrode pattern in the sub-pixel region may be formed by removing a specific region in the same electrode layer to form an electrode segment, the specific removed region being two slits on two sides of the electrode segment, and the finally formed electrode pattern being the electrode segment connecting two solid electrodes. The electrode pattern can be viewed as an I-shaped or H-shaped pattern.

According to the invention, the solid electrodes in each sub-pixel area are dimensioned in a specific way so as to compensate for the characteristics of the V-T curve of the liquid crystal display in the off-axis direction. If the solid electrode in one sub-pixel region is designed to be longer in the lateral direction than in the longitudinal direction, the corresponding solid electrode in the other sub-pixel region is designed to be shorter in the lateral direction than in the longitudinal direction.

In another preferred embodiment of the present invention, each pixel region of the liquid crystal display includes a sub-pixel region in which a self-compensating electrode pattern is formed. The electrode pattern is neither bilaterally nor vertically symmetrical, and at least an even number of slits are formed on the electrode.

In one example of the preferred embodiment, two slits are formed on the electrode in the sub-pixel region of the pixel region, wherein one slit is mostly located in the upper left region of the pixel region and the other slit is mostly located in the lower right region of the pixel region.

In another example of the preferred embodiment, one of the two slits is mostly located in the upper right region of the sub-pixel region, and the other slit is mostly located in the lower left region of the sub-pixel region.

According to the present invention, the extending direction of each slit forms an angle of between 0 and 10 degrees with the data line in the pixel region, preferably an angle at which each slit is parallel to the data line. The angle may be between 15 and 30 degrees formed by the extending direction of the slit and the data line, and is preferably between 20 and 26 degrees. In the pixel region, each slit may be aligned or not aligned on the same straight line.

Each slit in the sub-pixel region may have an open end in an extending direction thereof, thereby providing a notch gap formed by the slit at the periphery of the electrode in the sub-pixel region. Each slit may also have no open end in its extension direction, so that the electrode has a perimeter that is closed without any recesses.

In another embodiment of the present invention, each pixel region of the liquid crystal display includes two sub-pixel regions, each of which is formed with a self-compensating electrode pattern. The electrode pattern in each sub-pixel region is neither left-right nor up-down symmetrical, and at least an even number of slits are formed on the electrode.

In one example of the preferred embodiment, both sub-pixel regions have the same electrode pattern. Two slits are formed on the electrode in each sub-pixel region, wherein most of one slit is positioned in the upper left region of the sub-pixel region, and most of the other slit is positioned in the lower right region of the sub-pixel region.

In another example of the preferred embodiment, the two sub-pixel regions have different electrode patterns. Two slits are formed on the electrode in each sub-pixel region. In one sub-pixel region, the two slits are mostly located in the upper left region and the lower right region of the sub-pixel region, respectively. In the other sub-pixel region, the two slits are mostly located in the upper right region and the lower left region of the sub-pixel region, respectively.

In yet another example of the preferred embodiment, the two sub-pixel regions also have different electrode patterns. Two slits are formed on the electrode in one sub-pixel region, wherein most of the two slits are respectively positioned in the upper left region and the lower right region of the sub-pixel region. Four slits are formed on the electrode in the other sub-pixel region, two of the four slits are mostly located in the upper right region and the lower left region, respectively, and the other two of the four slits are mostly located in the upper left region and the lower right region, respectively, of the sub-pixel region.

Drawings

Fig. 1 shows a cross-sectional view of a liquid crystal display according to the present invention.

Fig. 2 shows an example of a liquid crystal display according to the present invention forming a self-compensating electrode pattern in each pixel region.

Fig. 3 shows another example of forming a self-compensation electrode pattern in each pixel region of the liquid crystal display according to the present invention.

Fig. 4 shows an example of a liquid crystal display according to the present invention forming a self-compensation electrode pattern in one sub-pixel region in each pixel region.

Fig. 5 shows a variation of the self-compensating electrode pattern shown in fig. 4, in which the open ends of the two slits are closed.

Fig. 6 illustrates a variation of the self-compensating electrode pattern shown in fig. 5, in which two slits are mostly formed in the upper right and lower left regions of each pixel region, respectively, and form an angle of between 15 and 30 degrees with the data lines in the pixel regions.

Fig. 7 illustrates another variation of the self-compensating electrode pattern shown in fig. 5, in which two slits are mostly formed in the upper left and lower right regions of each pixel region, respectively, and form an angle of between 15 and 30 degrees with the data line in the pixel region.

Fig. 8 shows an example in which two self-compensating electrode patterns shown in fig. 5 are formed in each pixel region, respectively, in two sub-pixel regions of the pixel region in the liquid crystal display according to the present invention.

Fig. 9 shows an example in which two self-compensating electrode patterns are formed in each pixel region, respectively, in two sub-pixel regions in a liquid crystal display, one of the electrode patterns being similar to the electrode pattern shown in fig. 7 and the other electrode pattern being similar to the electrode pattern shown in fig. 6.

Fig. 10 shows an example in which two self-compensating electrode patterns are formed in each pixel region, respectively, in two sub-pixel regions in a liquid crystal display, one of the electrode patterns being similar to the electrode pattern shown in fig. 7, and the other electrode pattern having four slits.

Detailed Description

The accompanying drawings are provided to enable a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

Referring to fig. 1, a liquid crystal display according to the present invention includes a first substrate 101, a second substrate 102, a first electrode layer 103, a second electrode layer 104, and a liquid crystal layer 105 between the first and second electrode layers. The first and second substrates are opposed to each other with the liquid crystal layer 105 interposed therebetween. The first and second electrode layers are formed of a transparent conductive film such as indium tin oxide or indium zinc oxide on the first and second substrates.

The liquid crystal molecules in the liquid crystal layer include nematic liquid crystal materials, such as nematic liquid crystal materials having negative dielectric anisotropy. A substance having an optical activity is added to the liquid crystal layer. For example, an optical Chiral Dopant (Chiral Dopant) is added to the liquid crystal layer so that liquid crystal molecules are twisted along an axis parallel to the normal line of the first substrate 101 to have optical rotation (optical chirality). The added optically active substance may have an optical chirality of left or right hand. In order to provide the liquid crystal molecules with a sufficient twist space, the ratio d/p of the thickness d of the liquid crystal layer to the pitch p of the optically chiral substance is preferably between 0.16 and 0.42.

According to one embodiment of the present invention, each pixel region of the liquid crystal display having the self-compensating electrode pattern includes at least two sub-pixel regions, and each sub-pixel region includes at least two solid electrodes electrically connected to each other. Each solid electrode may be a polygonal electrode without any slit voids inside the solid electrode. The polygon may be a triangle, a quadrilateral, a pentagon, or a hexagon. A preferred embodiment is to have only two solid electrodes in each sub-pixel area, and each solid electrode is a polygonal electrode.

Fig. 2 shows an example of a self-compensating electrode pattern in a pixel region of a liquid crystal display according to the present invention. The pixel area is an area defined by the gate lines 205 and the data lines 206 of the liquid crystal display. Each pixel region includes a sub-pixel 1 'and a sub-pixel 2'. The ratio of the size of the area of the sub-pixel 1 'region to the size of the area of the sub-pixel 2' region is preferably between 1/3 and 3/4.

In the area of the sub-pixel 1', the electrode 201 and the electrode 202 are electrically connected to each other. Similarly, in the area of the sub-pixel 2', the electrode 203 and the electrode 204 are electrically connected to each other. The vertical reference line 212 passes through the center point of the pixel region and is parallel to the data line 206, and the horizontal reference line 210 passes through the center point of the pixel region and is parallel to the gate line 205.

For the purpose of wide viewing angle and improving the display quality of oblique viewing angle, the electrode patterns in the two sub-pixel regions can be designed such that the off-axis V-T curves of the two sub-pixel regions have mutually compensating characteristics. For example, if the

solid electrode

201 or 202 in the sub-pixel 1 'is designed to have a length in at least one lateral direction longer than that in the longitudinal direction, the corresponding

solid electrode

203 or 204 in the sub-pixel 2' should be designed to have a length in at least one lateral direction shorter than that in the longitudinal direction.

In contrast, if the

solid electrode

201 or 202 in the sub-pixel 1 'is designed to have at least one length in the lateral direction shorter than the length in the longitudinal direction, the corresponding

solid electrode

203 or 204 in the sub-pixel 2' should be designed to have at least one length in the lateral direction longer than the length in the longitudinal direction.

The length of at least one side of the

solid electrode

201 or 202 in the longitudinal direction is shorter than the length of the

solid electrode

203 or 204 in the longitudinal direction. The length of at least one side of the

solid electrode

201 or 202 in the lateral direction is longer than the length of the

solid electrode

203 or 204 in the lateral direction.

According to the off-axis V-T curve characteristic, if the sub-pixel 1 'has better display quality than the sub-pixel 2' at the off-axis (θ, Φ) — (60, 0) viewing angle, the sub-pixel 2 'will have better display quality than the sub-pixel 1' at the off-axis (θ, Φ) — (60,90) viewing angle, where θ and Φ are symbols representing the polar angle and the azimuth angle. As a result, the two sub-pixel regions are designed as solid electrodes with mutually corresponding sizes, which can compensate each other on the off-axis V-T curve, and the off-axis display quality of the liquid crystal display can be improved.

In the preferred embodiment as shown in fig. 2, there are two sub-pixel regions in each pixel region. The electrode 201 in the sub-pixel 1 'has the same shape as the electrode 202 in the sub-pixel 1', and the electrode 203 in the sub-pixel 2 'has the same shape as the electrode 204 in the sub-pixel 2'. The electrodes in the pixel area are all rectangular solid electrodes. It should be noted that the electrode 201 and the electrode 202 in the sub-pixel 1' are electrically connected by electrode segments in the same electrode layer. The electrode 203 and the electrode 204 in the sub-pixel 2' are also electrically connected by electrode segments in the same electrode layer.

As shown in fig. 2, the

electrodes

201 and 202 in the sub-pixel 1 'each have a horizontal length longer than a vertical length, and the

electrodes

203 and 204 in the sub-pixel 2' each have a horizontal length shorter than a vertical length. The whole electrode pattern in this sub-pixel 1' can be regarded as forming an electrode segment 207 and two slits, i.e. slit 1 and slit 2, by removing a specific electrode area on the electrode layer. The slit 1 and the slit 2 between the electrode 201 and the electrode 202 have a slit width sw 1. The entire electrode pattern in the sub-pixel 1' can be regarded as an I-shaped pattern.

In the example shown in fig. 2, the sub-pixel 1' has two specific electrode areas selectively removed, i.e., at least an even number of electrode areas are removed to form an electrode pattern having an even number of slits. The entire electrode pattern in the sub-pixel 1' is a left-right symmetrical pattern with the vertical reference line 212 as a reference line.

Likewise, the entire electrode pattern in the sub-pixel 2' can be considered as forming the electrode segment 208 and two slits, i.e. slit 3 and slit 4, by removing a specific electrode area on the electrode layer. The slit 3 and the slit 4 between the electrode 203 and the electrode 204 have a slit width sw 2. The entire electrode pattern in the sub-pixel 2' can be regarded as an "H" -shaped pattern. sw1 may be less than or equal to sw 2. In this example, the slits in the sub-pixel 1 'or the sub-pixel 2' may be formed on the same straight line or different straight lines. In other words, the two slits in the sub-pixel may be misaligned or non-misaligned. The slit width may also be unequal, and the slit width may be narrower near the center region of the sub-pixel.

In some embodiment variations, each pixel region of the liquid crystal display of the present invention may have only one sub-pixel region, i.e., only sub-pixel 1 'or sub-pixel 2'. In this case, the electrode patterns in the sub-pixel region are left-right symmetric with respect to the vertical reference line 212. The electrode patterns in the sub-pixel region are vertically symmetrical with respect to the horizontal reference line 210.

Referring to FIG. 2, two slits in subpixel 1' having width sw1 are parallel to horizontal reference line 210. In the present invention, the preferred width sw1 is greater than half the thickness d of the liquid crystal layer, but less than twice the thickness d of the liquid crystal layer, i.e. 0.5d < sw1<2 d. The two slits in subpixel 2' having width sw2 are parallel to the vertical reference line 212. The preferred width sw2 is greater than half the thickness d of the liquid crystal layer and less than twice the thickness d of the liquid crystal layer, and the most preferred design is 1.5d < sw2<2 d. For each slit described above, having a length L and a width W, preferably L should be greater than W, and most preferably L > 1.5W.

Fig. 3 shows another example of a self-compensating electrode pattern in a pixel region of a liquid crystal display according to the present invention. In this example, each pixel region is defined by the gate lines 205 and the data lines 206, and includes sub-pixels 1 'and 2'. In the area of the sub-pixel 1', there are two

electrodes

301 and 302. Similarly, in the area of the sub-pixel 2', there are two

electrodes

303 and 304.

As shown in fig. 3, the electrodes in the pixel region are all rectangular, and the electrodes also have a similar electrode structure and size to those in fig. 2. However, the electrical connection between the

electrodes

301 and 302 of the sub-pixel 1' is formed by connecting electrode segments of different electrode layers from the

electrodes

301 and 302. The electrical conduction of the

electrodes

303 and 304 is also formed by connecting electrode segments of different electrode layers from the

electrodes

303 and 304. The electrode line segments are not shown in fig. 3.

Fig. 4 shows an example of a self-compensating electrode pattern 401 formed in each pixel region of a liquid crystal display according to a preferred embodiment of the present invention. The pixel area is an area defined by the gate lines 205 and the data lines 206 of the liquid crystal display. In the present embodiment, each pixel region includes only one sub-pixel region, i.e., the sub-pixel 1'. The electrode pattern 401 is formed by removing two specific regions of the electrode layer in the sub-pixel region, and the electrode pattern 401 is asymmetric in both the left-right and up-down directions.

As shown in FIG. 4, in the pixel region, a vertical reference line 212 passing through the center of the pixel region is parallel to the data line 206, and a horizontal reference line 210 passing through the center of the pixel region is parallel to the gate line 205. The electrode pattern 401 is not bilaterally symmetric with respect to the vertical reference line 212, nor is it vertically symmetric with respect to the horizontal reference line 210.

Two slits are formed in the pixel region where two specific regions of the electrode are removed, as shown in fig. 4, that is, the slit s41 and the slit s42, having widths sw41 and sw42, respectively. The extending direction of each slit and the data line 206 have an angle between 0 and 10 degrees. As shown in fig. 4, a preferred angle is 0 degrees. It is preferable that the angle between the slit s41 and the data line 206 is the same as the angle between the slit s42 and the data line 206. However, the two angles may also be different.

In the preferred embodiment shown in FIG. 4, where the two slots are parallel to the vertical reference line 212, the widths sw41 and sw42 may be the same or different. Both widths should be larger than the thickness d of the liquid crystal layer, preferably 1.5d < sw41<2d and 1.5d < sw42<2 d.

Fig. 5 shows another example of a liquid crystal display device in which a self-compensating electrode pattern 501 is formed in each pixel region according to a preferred embodiment of the present invention. The electrode pattern 501 in this embodiment is similar to the electrode pattern shown in fig. 4, except that the two slits s51 and s52 have no open ends. In other words, the periphery of the electrode pattern 501 is closed without any recess.

Fig. 6 shows a variation of the self-compensating electrode pattern in the pixel region of the liquid crystal display shown in fig. 5. In this example, the two slits s61 and s62 in the electrode pattern 601 also have no open ends, and the electrode pattern 601 is similar to fig. 5 in that the perimeter is closed without any recesses. However, the two slits s61 and s62 are not parallel to the vertical reference line 212. The extending direction of each slit forms an angle of between 15 and 30 degrees, preferably between 20 and 26 degrees, with the data line 206.

As shown in fig. 6, the pixel area is divided into upper right, lower right, upper left and lower left areas by the vertical and

horizontal reference lines

212, 210. It can be seen that the slits s61 are located mostly in the upper right region and the slits s62 are located mostly in the lower left region. In the example shown in fig. 6, the angle between the slit s61 and the data line 206 is the same as the angle between the slit s62 and the data line 206. The two slits s61 and s62 are located on the same straight line. However, the two slits need not be located or aligned on the same line.

Fig. 7 illustrates another variation of the self-compensating electrode pattern in the pixel region of the liquid crystal display shown in fig. 5. In this example, the two slits s71 and s72 in the electrode pattern 701 also have no open ends, and similarly to fig. 5, the electrode pattern has a periphery that is closed without any recess. Similar to fig. 6, the two slits s71 and s72 are also not parallel to the vertical reference line 212. However, the slit s71 is mostly located in the upper left area of the pixel area, and the slit s72 is mostly located in the lower right area of the pixel area.

In the example shown in fig. 7, the extending direction of each slit and the data line 206 also form an angle of between 15 and 30 degrees, preferably an angle of between 20 and 26 degrees. The angle between the slit s71 and the data line 206 may be the same as the angle between the slit s72 and the data line 206. The two slits s71 and s72 are not aligned on the same line. However, the two slits need not be in different lines or be misaligned, and the two slits may be in the same line.

Fig. 8 shows another example of a self-compensating electrode pattern formed in a pixel region of a liquid crystal display according to a preferred embodiment of the present invention. In this embodiment, each pixel region includes a sub-pixel 1 'and a sub-pixel 2', and each sub-pixel region is formed with a self-compensation electrode pattern similar to that shown in fig. 5. As shown in fig. 8, two sub-pixels have the

same electrode patterns

801 and 803.

As shown in fig. 8, the

electrode pattern

801 or 803 in each sub-pixel region has two slits. One of the two slits is mostly located in an upper left region of the sub-pixel region, and the other slit is mostly located in a lower right region of the sub-pixel region. The extending direction of each slit forms an angle of 0 to 10 degrees with the data line 206 in the pixel region, and preferably, each slit is parallel to the data line 206.

Fig. 9 shows a variation of the self-compensating electrode pattern in the pixel area of the liquid crystal display of fig. 8 according to the present invention. In this example, each pixel region also includes a sub-pixel 1 'and a sub-pixel 2'. The sub-pixel 1 'is formed with a self-compensating electrode pattern 901 similar to that shown in fig. 7, and the sub-pixel 2' is formed with a self-compensating electrode pattern 903 similar to that shown in fig. 6. In other words, the two sub-pixels have different electrode patterns.

As shown in fig. 9, the electrode pattern 901 in the sub-pixel 1' is formed with two slits. In the sub-pixel 1 'region, the two slits are mostly located in the upper left region and the lower right region of the sub-pixel 1' region, respectively. The electrode pattern 903 in the sub-pixel 2' is also formed with two slits. In the sub-pixel 2 'region, the two slits are mostly located in the upper right region and the lower left region of the sub-pixel 2' region, respectively.

Fig. 10 shows yet another variation of the self-compensating electrode pattern in the pixel region of the liquid crystal display of fig. 8 according to the present invention. In this example, each pixel region includes a sub-pixel 1 'and a sub-pixel 2'. The sub-pixel 1' is formed with a self-compensation electrode pattern 1001 similar to that shown in fig. 7. In the sub-pixel 2', four specific regions of the electrode layer of the sub-pixel region, i.e., the upper left, lower right, upper right, and lower left, are removed, respectively, to form four slits, i.e., the self-compensating electrode pattern 1003 having the slits s103, s104, s105, and s 106.

As shown in fig. 10, the horizontal reference line 214 passing through the center of the region of the sub-pixel 2 'is parallel to the gate line 205, and the electrode pattern 1003 in the sub-pixel 2' is not symmetrical left and right with respect to the vertical reference line 212 and is also not symmetrical up and down with respect to the horizontal reference line 214. The slits s103 and s104 are mostly located at the upper left and lower right regions of the sub-pixel 2 'region, respectively, and the slits s105 and s106 are mostly located at the upper right and lower left regions of the sub-pixel 2' region, respectively.

The extending direction of the slit s103 and the data line 206 has an angle of 0 to 10 degrees, preferably 0 degree. The extending direction of the slits s104 and the data line 206 also have an angle of 0 to 10 degrees, and a preferable angle is 0 degree. It is preferred, but not necessary, that the two angles be the same.

As shown in fig. 10, the extending direction of the slit s105 and the data line 206 has an angle of 15 to 30 degrees, preferably 20 to 26 degrees. The extending direction of the slit s106 and the data line 206 also have an angle of 15 to 30 degrees, and a preferable angle is 20 to 26 degrees. It is also preferred, but not required, that the two angles be the same. Further, it is preferable, but not necessary, that the width sw103 of the slit s103 is not the same as the width sw106 of the slit s 106. The width of the slit shown in fig. 10 is uniform. However, the width of each slit is not necessarily uniform, and the slit width may become narrower in a region closer to the center of the sub-pixel.

Although the invention has been described with respect to a few preferred embodiments, it will be apparent to those skilled in the art that many more variations and modifications, none of which are described, are possible without departing from the scope of the invention as defined in the following claims.

Wherein the reference numerals are as follows:

1. 2, 3, 4 slits

1 ', 2' sub-pixel, sub-pixel

101 first substrate

102 second substrate

103 first electrode layer

104 second electrode layer

105 liquid crystal layer

201. 202, 203, 204, 301, 302, 303, 304 electrodes

205 gate line

206 data line

207. 208 electrode segment

210 horizontal reference line

212 vertical reference line

214 reference line

401. 501, 601, 701, 801, 803, 901, 903, 1001, 1003 electrodes

s41, s42, s51, s52, s61, s62, s71, s72 slits

s101, s102, s103, s104, s105, s106 slits

sw1 and sw2 slit width

sw41, sw42, sw103 and sw106 widths

Claims

1. A liquid crystal display having a plurality of pixel regions, each pixel region having at least one sub-pixel region, the at least one sub-pixel region comprising:

a first substrate having a first electrode formed in the at least one sub-pixel region;

a second substrate on which a second electrode is formed, the second substrate being opposed to the first substrate; and

a liquid crystal layer added with optically active material and arranged between the first and second substrates;

wherein at least an even number of slits are formed in the first electrode, and the first electrode has an electrode pattern that is neither bilaterally nor vertically symmetric.

2. The liquid crystal display of claim 1, wherein the extending direction of each slit has an angle between 0 and 10 degrees with respect to the data line in the pixel region.

3. The liquid crystal display of claim 1, wherein each slit is parallel to the data line in the pixel region.

4. The liquid crystal display of claim 1, wherein the extending direction of each slit has an angle between 15 and 30 degrees with respect to the data line in the pixel region.

5. The liquid crystal display of claim 1, wherein the slits are aligned in a single line.

6. The liquid crystal display of claim 1, wherein the slits are not aligned in a single line.

7. The liquid crystal display of claim 1, wherein only two slits are formed in the first electrode of the at least one sub-pixel region.

8. The liquid crystal display of claim 7, wherein one of the two slits is mostly located in an upper right region of the at least one sub-pixel region, and the other of the two slits is mostly located in a lower left region of the at least one sub-pixel region.

9. The liquid crystal display of claim 7, wherein one of the two slits is mostly located in an upper left region of the at least one sub-pixel region, and the other of the two slits is mostly located in a lower right region of the at least one sub-pixel region.

10. A liquid crystal display having a plurality of pixel regions, each pixel region having at least two sub-pixel regions, comprising:

a first substrate on which a first electrode layer is formed;

a second substrate on which a second electrode layer is formed, the second substrate being opposite to the first substrate;

the first sub-pixel region is provided with a first electrode pattern in the first electrode layer, the first electrode pattern is provided with at least an even number of slits, and the first electrode pattern is not symmetrical left and right or up and down; and

the second sub-pixel region has a second electrode pattern in the first electrode layer, and the second electrode pattern has at least an even number of slits and is neither laterally symmetrical nor vertically symmetrical.

11. The liquid crystal display of claim 10, wherein the extending direction of each slit has an angle between 0 and 10 degrees with respect to the data line in the pixel region.

12. The liquid crystal display of claim 10, wherein the extending direction of each slit has an angle between 15 and 30 degrees with respect to the data line in the pixel region.

13. The liquid crystal display of claim 10, wherein each slit is parallel to the data line in the pixel region.

14. The liquid crystal display of claim 10, wherein the first electrode pattern has at least two slits respectively located in an upper left region and a lower right region within the first electrode pattern, and the second electrode pattern has at least two slits respectively located in an upper left region and a lower right region within the second electrode pattern.

15. The liquid crystal display of claim 10, wherein the first electrode pattern has at least two slits respectively located in an upper left region and a lower right region within the first electrode pattern, and the second electrode pattern has at least two slits respectively located in an upper right region and a lower left region within the second electrode pattern.

16. The liquid crystal display of claim 15, wherein the second electrode pattern further has at least two slits respectively located in an upper left region and a lower right region within the second electrode pattern, and a width of each slit located in the upper left region and the lower right region within the second electrode pattern is different from a width of the slit located in the upper right region and the lower left region within the second electrode pattern.