CN115113442B

CN115113442B - Display panel and display device

Info

Publication number: CN115113442B
Application number: CN202210449291.7A
Authority: CN
Inventors: 李凡; 彭林; 张勇; 神户诚; 王志刚; 李林; 吴潘强; 任驹; 刘聪聪; 韩建; 李静; 邓海威; 邓明旺; 黄均宇
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Display Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Display Technology Co Ltd
Priority date: 2022-04-26
Filing date: 2022-04-26
Publication date: 2024-04-26
Anticipated expiration: 2042-04-26
Also published as: CN115113442A

Abstract

The embodiment of the disclosure provides a display panel and a display device. The display panel includes: the display panel comprises a plurality of sub-pixel areas, wherein the sub-pixel areas are divided into m sequentially adjacent domains, each domain of one of the first substrate and the second substrate is provided with a light alignment direction, each domain of the other substrate is provided with a slit electrode, the light alignment directions of the domains are parallel to each other, and the extending direction of a slit in the slit electrode of each domain is not parallel to the light alignment direction, wherein m is an even number larger than 0. According to the technical scheme, the liquid crystal molecules of the liquid crystal layer are changed from a single-side mode to a rotating mode, so that the azimuth angles of the liquid crystal molecules in each domain area are reduced, and the color cast condition of the display panel is improved; and the total exposure times to the display panel are reduced, and the productivity of the display panel is improved.

Description

Display panel and display device

Technical Field

The disclosure relates to the field of display technologies, and in particular, to a display panel and a display device.

Background

In the related art, a liquid crystal display panel provides an initial azimuth angle for a liquid crystal by using a photoalignment technique, for example, a photoalignment process such as ultra-fine photoalignment (SUVA iii or SUVA v) is used to expose a photoalignment layer of a substrate to form a photoalignment direction. In the prior art, a liquid crystal display panel using a photoalignment direction has Color shift problems, such as a left-right viewing angle display (Skin Color) and a Contrast (CR) (80/20) level difference, which affect the optical performance of the display panel. In addition, the total exposure times of the display panel are larger, and the productivity of the display panel is reduced.

Disclosure of Invention

Embodiments of the present disclosure provide a display panel and a display device to solve or alleviate one or more technical problems in the prior art.

As a first aspect of embodiments of the present disclosure, embodiments of the present disclosure provide a display panel including a first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer disposed between the first substrate and the second substrate, the display panel including a plurality of sub-pixel regions divided into m sequentially adjacent domains, each domain of one of the first substrate and the second substrate being provided with a photoalignment direction, each domain of the other substrate being provided with a slit electrode, the photoalignment directions of the domains being parallel to each other, an extension direction of a slit in the slit electrode of each domain being non-parallel to the photoalignment direction, wherein m is an even number greater than 0.

In some possible implementations, the slit electrodes of each adjacent two domains are symmetrical to each other, and the rotation states of the liquid crystal molecules of each adjacent two domains are symmetrical in a direction from one of the first substrate and the second substrate toward the other.

In some possible implementations, the slit electrodes of every two adjacent domains are symmetrical to each other, and the slits in the slit electrodes of each domain form a preset included angle θ with the direction of the second central axis, where θ is greater than or equal to 45 ° and less than or equal to 90 °, and the second central axis passes through the center of the sub-pixel region.

In some possible implementations, 60+.θ+.80°

In some possible implementations, the sub-pixel area is divided into four sequentially adjacent first domain areas, second domain areas, third domain areas and fourth domain areas along the direction of the first central axis, the light alignment directions of the four domain areas are parallel to the second central axis, the light alignment directions of the first domain areas and the fourth domain areas are towards the outer edge of one side of the sub-pixel area parallel to the first central axis, and the light alignment directions of the second domain areas and the third domain areas are opposite to the light alignment directions of the first domain areas;

the first central axis passes through the center of the sub-pixel area, and the second central axis passes through the center of the sub-pixel area and is perpendicular to the first central axis.

In some possible implementations, the display side of the display panel is located on a side of the second substrate facing away from the first substrate, the optical alignment direction is set on the second substrate, the slit electrodes are set on the first substrate, the slit electrodes of every two adjacent domains are symmetrical to each other, the slits of the slit electrodes in the first domain form a preset included angle θ with the direction of the second central axis, and the preset included angle θ faces a side opposite to the optical alignment direction of the first domain.

In some possible implementations, the display side of the display panel is located on a side, away from the first substrate, of the second substrate, the optical alignment direction is set on the first substrate, the slit electrodes are set on the second substrate, the slit electrodes of every two adjacent domains are symmetrical to each other, a preset included angle θ is formed between the slit of the slit electrode in the first domain and the direction in which the second central axis is located, and the preset included angle θ faces the same side as the optical alignment direction of the first domain.

In some possible implementations, the sub-pixel region is divided by a first central axis and a second central axis into a first domain, a second domain, a third domain and a fourth domain that are sequentially adjacent, and the optical alignment of each domain is parallel to one of the first central axis or the second central axis;

The slits in the slit electrodes of each domain form a preset included angle theta with the direction of the second central axis, and the preset included angle theta of each domain faces to the outer edge of the corresponding domain, which is parallel to the first central axis;

In some possible implementations, the display side of the display panel is located on a side, facing away from the first substrate, of the second substrate, the photoalignment direction is set on the second substrate, the slit electrodes are set on the first substrate, the slit electrodes of every two adjacent domains are symmetrical to each other, and the photoalignment directions of the domains are parallel to one of the first central axis and the second central axis and face the other central axis.

In some possible implementations, the display side of the display panel is located on a side, away from the first substrate, of the second substrate, the photoalignment direction is set on the first substrate, the slit electrodes are set on the second substrate, the slit electrodes of every two adjacent domains are symmetrical to each other, and the photoalignment directions of the domains are parallel to one of the first central axis and the second central axis and face a direction away from the other central axis.

In some possible implementations, the slit electrode further includes a first center slit passing through a center of the sub-pixel region and parallel to the first center axis.

In some possible implementations, the slit electrode further includes a second central slit passing through the center of the sub-pixel region and parallel to the second central axis.

As a second aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide a display device including the display panel in the embodiments of the present disclosure.

According to the technical scheme, the liquid crystal molecules of the liquid crystal layer in the display panel are changed from a single-side mode to a rotating mode, so that the azimuth angles of the liquid crystal molecules in each domain area are reduced, and the color cast condition of the display panel is improved; and only one substrate of the first substrate and the second substrate is subjected to optical alignment, so that the total exposure times of the display panel are reduced, and the productivity of the display panel is improved.

The foregoing summary is for the purpose of the specification only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present disclosure will become apparent by reference to the drawings and the following detailed description.

Drawings

In the drawings, the same reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily drawn to scale. It is appreciated that these drawings depict only some embodiments according to the disclosure and are not to be considered limiting of its scope.

FIG. 1a is a schematic cross-sectional view of a display panel;

FIG. 1b is a schematic view of a sub-pixel region in the A-direction view of the display panel shown in FIG. 1 a;

FIG. 2a is a schematic flow chart of photo-alignment of a second substrate;

FIG. 2b is a schematic diagram of a combined alignment of sub-pixel regions after photo-alignment of the second substrate using FIG. 2 a;

FIG. 2c is a schematic view of the molecular intermediaries and dark lines of the liquid crystal layer in the sub-pixel region of the display panel using the second substrate shown in FIG. 2 b;

FIG. 3a is a schematic diagram illustrating another process of photo-alignment of a second substrate;

FIG. 3b is a schematic diagram of a combined alignment of sub-pixel regions after photo-alignment of the second substrate using the first substrate of FIG. 3 a;

FIG. 3c is a schematic view showing a molecular intermediate state of a liquid crystal layer in a sub-pixel region of the display panel using the second substrate shown in FIG. 3 b;

FIG. 4a is a schematic flow chart of photoalignment of a first substrate and a second substrate;

FIG. 4b is a schematic diagram of alignment force after the first substrate and the second substrate are bonded;

FIG. 4c is a schematic diagram illustrating the turning of the liquid crystal layer of the display substrate shown in FIG. 4 b;

FIG. 5 is an A-direction view of the display panel of FIG. 1 in one embodiment;

FIG. 6 is a schematic view of a slit electrode;

FIG. 7a is a schematic view of a sub-pixel region of the second substrate of the display panel of FIG. 5 in one embodiment;

FIG. 7b is a schematic view of a sub-pixel region of the first substrate of the display panel of FIG. 5 in one embodiment;

FIG. 7c is a schematic diagram illustrating the inversion of the liquid crystal molecules on the surface of the second substrate shown in FIG. 7 a;

FIG. 7d is a schematic diagram illustrating the turning of the liquid crystal molecules on the surface of the first substrate shown in FIG. 7 b;

FIG. 7e is a schematic diagram illustrating the inversion of the intermediate liquid crystal molecules of the liquid crystal layer after the second substrate shown in FIG. 7a and the first substrate shown in FIG. 7b are bonded;

FIG. 8 is a schematic flow chart illustrating the formation of the second substrate shown in FIG. 7a according to one embodiment;

FIG. 9 is an A-direction view of the display panel of FIG. 1 in another embodiment;

FIG. 10a is a schematic view of a sub-pixel region of the second substrate of the display panel of FIG. 9 in one embodiment;

FIG. 10b is a schematic view of a sub-pixel region of the first substrate of the display panel of FIG. 9 in one embodiment;

FIG. 10c is a schematic diagram illustrating the turning of the liquid crystal molecules on the surface of the second substrate shown in FIG. 10 a;

FIG. 10d is a schematic diagram illustrating the turning of the liquid crystal molecules on the surface of the first substrate shown in FIG. 10 b;

FIG. 10e is a schematic diagram illustrating the inversion of the intermediate liquid crystal molecules of the liquid crystal layer after the second substrate shown in FIG. 10a and the first substrate shown in FIG. 10b are bonded;

FIG. 11 is a schematic flow chart diagram illustrating the formation of the second substrate shown in FIG. 10a according to one embodiment;

FIG. 12 is an A-direction view of the display panel of FIG. 1 in another embodiment;

FIG. 13a is a schematic diagram of the electric field force cross section of the second domain and the liquid crystal molecule turning;

FIG. 13b is a schematic diagram of the electric field force of the second domain in top view and the liquid crystal molecule turning;

FIG. 14 is an A-direction view of the display panel of FIG. 1 in another embodiment;

FIG. 15a is a schematic view of a sub-pixel region of the second substrate of the display panel of FIG. 14 in one embodiment;

FIG. 15b is a schematic view of a sub-pixel region of the first substrate of the display panel of FIG. 14 in one embodiment;

FIG. 15c is a schematic diagram illustrating the inversion of the liquid crystal molecules on the surface of the second substrate shown in FIG. 15 a;

FIG. 15d is a schematic diagram illustrating the turning of the liquid crystal molecules on the surface of the first substrate shown in FIG. 15 b;

FIG. 15e is a schematic diagram illustrating the inversion of the intermediate liquid crystal molecules of the liquid crystal layer after the second substrate shown in FIG. 15a and the first substrate shown in FIG. 15b are bonded;

FIG. 16 is a schematic flow chart diagram illustrating a process for forming the second substrate shown in FIG. 15a according to one embodiment;

FIG. 17 is an A-direction view of the display panel of FIG. 1 in another embodiment;

FIG. 18a is a schematic view of a sub-pixel region of the second substrate of the display panel of FIG. 17 in one embodiment;

FIG. 18b is a schematic view of a sub-pixel region of the first substrate of the display panel of FIG. 17 in one embodiment;

FIG. 18c is a schematic diagram illustrating the inversion of the liquid crystal molecules on the surface of the second substrate shown in FIG. 18 a;

FIG. 18d is a schematic diagram illustrating the inversion of the liquid crystal molecules on the surface of the first substrate shown in FIG. 18 b;

FIG. 18e is a schematic diagram illustrating the inversion of the intermediate liquid crystal molecules of the liquid crystal layer after the second substrate shown in FIG. 18a and the first substrate shown in FIG. 18b are bonded;

FIG. 19 is a schematic flow chart diagram illustrating a process for forming the second substrate shown in FIG. 18a according to one embodiment;

FIG. 20 is an A-direction view of the display panel of FIG. 1 in another embodiment;

FIG. 21a is a schematic diagram of the electric field force cross section of the third domain and the liquid crystal molecule turning;

FIG. 21b is a schematic diagram illustrating the electric field force of the third domain in top view and the liquid crystal molecule turning;

FIG. 22a is a schematic diagram of a slit electrode in a display panel according to an embodiment of the disclosure;

FIG. 22b is a schematic view of a slit electrode in a display panel according to another embodiment of the disclosure;

FIG. 22c is a schematic view of a slit electrode in a display panel according to another embodiment of the disclosure;

FIG. 23a is a schematic view of the electric field force cross section of the first center slit of the display panel and the schematic view of the liquid crystal molecule turning direction of the first center slit of the display panel using the structure shown in FIGS. 15a and 22 c;

FIG. 23b is a schematic view of the electric field force cross section of the second center slit of the display panel and the schematic view of the liquid crystal molecules turning direction of the second center slit of the display panel according to the structure shown in FIGS. 15a and 22 c;

FIG. 23c is a schematic diagram of the electric field force cross-sectional oblique view angle and the liquid crystal molecule turning of the first center slit of the display panel using the structure shown in FIG. 18a and FIG. 22 c;

Fig. 23d is a schematic diagram of an electric field force cross-sectional oblique viewing angle and a schematic diagram of liquid crystal molecule turning of a second center slit of the display panel using the structure shown in fig. 18a and 22 c.

Reference numerals illustrate:

10. A first substrate; 20. a second substrate; 30. a liquid crystal layer; 41. a sub-pixel region; 411. a first domain; 412. a second domain; 413. a third domain; 414. a fourth domain; 421. a first central axis; 422. a second central axis; 423. a first side outer edge; 424. a second side outer edge; 425. a first central slit; 426. a second central slit.

Detailed Description

Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways, and the different embodiments may be combined arbitrarily without conflict, without departing from the spirit or scope of the present disclosure. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.

Fig. 1a is a schematic cross-sectional structure of a display panel, and fig. 1b is a schematic view of a sub-pixel region in an a-direction view of the display panel shown in fig. 1 a. As shown in fig. 1a, the display panel may include a first substrate 10 and a second substrate 20 disposed opposite to each other, and a liquid crystal layer 30 disposed between the first substrate 10 and the second substrate 20. Illustratively, one of the first substrate 10 and the second substrate 20 may be a thin film transistor (Thin Film Transistor, TFT) substrate, and the other may be a Color Filter (CF) substrate.

As shown in fig. 1b, the display panel includes a plurality of sub-pixel regions 41, the sub-pixel regions 41 have a first central axis 421 and a second central axis 422 passing through the center, the first central axis 421 and the second central axis 422 are perpendicular to each other, and the first central axis 421 may be along a length direction of the sub-pixel regions.

The second substrate 20 may be photoaligned using SUVA iii. Fig. 2a is a schematic flow chart of photo-alignment of the second substrate, and fig. 2b is a schematic diagram of the synthesized alignment of the sub-pixel region after the photo-alignment of the second substrate by using fig. 2 a; FIG. 2c is a schematic diagram showing the molecular intermediaries and dark lines of the liquid crystal layer in the sub-pixel region of the display panel using the second substrate shown in FIG. 2 b. Fig. 2b and 2c are both a-direction views of the sub-pixel area as shown in fig. 1 a.

It should be noted that, in order to distinguish the two ends of the liquid crystal molecule, a cone is used herein to characterize the liquid crystal molecule, the tip of the cone represents the tail of the liquid crystal molecule, and the large end of the cone represents the head of the liquid crystal molecule, as shown in fig. 2 c.

The sub-pixel region 41 is divided into a first domain 411, a second domain 412, a third domain 413, and a fourth domain 414, which are sequentially adjacent along a first central axis 421. As shown in fig. 2a, a polarization beam splitter prism (Polarization Beam Splitter, PBS) is first used to expose four domains of the second substrate 20 with low energy, the energy is set to 1 mJ-7 mJ, the light alignment directions of the four domains are as shown in fig. 2a, and the light alignment directions of the domains are all parallel to the second central axis 422. Then, the four domains are respectively exposed by using a Wire Grid (WGP) 45 DEG polarizer, the energy is set to be about 20mJ, the photoalignment direction of each domain is shown in FIG. 2a, and the included angle between the photoalignment direction of each domain and the second central axis 422 is 45 deg. In exposing the second substrate 20, a specific exposure energy value needs to be set for each Polyimide (PI).

Fig. 3a is a schematic diagram of another process of photo-alignment of the second substrate, and fig. 3b is a schematic diagram of the synthesized alignment of the sub-pixel regions after the photo-alignment of the second substrate by using fig. 3 a; fig. 3c is a schematic view showing a molecular intermediate state of a liquid crystal layer in a sub-pixel region of the display panel using the second substrate shown in fig. 3 b. In the photoalignment process shown in fig. 3a, PBS is first used to expose four domains of the second substrate 20 with low energy, the energy is set to 1 mJ-7 mJ, the photoalignment directions of the four domains are shown in fig. 3a, and the photoalignment directions of the domains are all parallel to the second central axis 422. And then the four domains are respectively exposed by adopting a WGP 45 DEG polaroid, the energy is set to be about 20mJ, the photoalignment direction of each domain is shown as a graph in FIG. 3a, and the included angle between the photoalignment direction of each domain and the second central axis 422 is 45 deg.

In the above two examples, after the two exposure processes of PBS low energy and WGP high energy are combined, the photoalignment directions of the domains of the sub-pixel area are shown in fig. 2b and 3b, respectively. Since the photoalignment direction of each domain in fig. 2b is the combined alignment of the two alignments shown in fig. 2a, and the photoalignment direction of each domain in fig. 3b is the combined alignment of the two alignments shown in fig. 3a, the angle between the combined photoalignment directions of each domain in fig. 2b and fig. 3b and the horizontal direction is smaller than 45 °. Thus, the azimuth angle of the liquid crystal molecules in each domain is less than 45 °, as shown in fig. 2c and 3 c. In the schematic diagrams shown in fig. 2c or fig. 3c, the azimuth angle of the liquid crystal molecules is the angle between the intermediate liquid crystal molecules of the liquid crystal layer 30 and the second central axis 422 (horizontal direction in fig. 1) of the sub-pixel region.

After the second substrate 20 is photo-aligned by using the exposure process shown in fig. 2a or fig. 3a, the left and right viewing angle color cast of the display panel is improved. In the photoalignment mode shown in fig. 2a and fig. 3a, the total number of exposure times is 8 in the photoalignment process of the display panel, which reduces the productivity of the display panel.

Fig. 4a is a schematic flow chart of photo-alignment of the first substrate and the second substrate, and fig. 4b is a schematic alignment force diagram after the first substrate and the second substrate are attached; fig. 4c is a schematic diagram illustrating the turning of the liquid crystal layer of the display substrate shown in fig. 4 b. In fig. 4b, the alignment force represented by the dashed arrow is located on the second substrate 20, and the alignment force represented by the solid arrow is located on the first substrate 10. In one example, the sub-pixel region is divided into four domains, namely, a first domain 411, a second domain 412, a third domain 413 and a fourth domain 414, by a first central axis 421 and a second central axis 422. The first substrate 10 and the second substrate 20 may be photo-aligned by a SUVA process, as shown in fig. 4a, four exposures of the first substrate 10 may be performed by using WGP 45 ° polarizing plates, so that opposite alignment directions parallel to the second central axis 422 may be obtained, the alignment directions of the second domain 412 and the third domain 413 are both facing away from the first central axis 421, and the alignment directions of the first domain 411 and the fourth domain 414 are both facing away from the first central axis 421. Four exposures of the second substrate 20 with the WGP 45 polarizing plate may result in opposite alignment directions parallel to the first central axis 421, the alignment directions of the first domain 411 and the second domain 412 facing the second central axis 422, and the alignment directions of the third domain 413 and the fourth domain 414 facing the second central axis 422. After the second substrate 20 and the first substrate 10 are bonded, the alignment direction of the display substrate is as shown in fig. 4b, and in fig. 4b, the alignment layer of the first substrate 10 faces upward. Fig. 4c shows the first substrate 10 surface liquid crystal inversion, the second substrate 20 surface liquid crystal inversion, and the intermediate state liquid crystal molecule inversion and dark lines. As shown in FIG. 4c, the dark lines comprise a transverse dark line and a longitudinal dark line, the dark lines are shaped like a cross, and the length of the dark lines is (4/3) a. In the prior art, the length of the dark line is (8/3) a, so that after alignment is performed by adopting the photo-alignment process shown in fig. 4a, the dark line of the display substrate accounts for 50% of that of the conventional mass production process, and the dark line is shortened by 50%.

By adopting the SUVA V process, the first substrate 10 and the second substrate 20 are required to be exposed for 8 times, the yield loss is large, and the yield of the display panel is reduced.

Fig. 5 is an a-direction view of the display panel shown in fig. 1 in an embodiment, and fig. 5 shows the photoalignment direction of each domain and the slit electrode. The embodiment of the present disclosure provides a display panel, as shown in fig. 1 and 5, which includes a first substrate 10 and a second substrate 20 disposed opposite to each other, and a liquid crystal layer 30 between the first substrate 10 and the second substrate 20. The display panel includes a plurality of sub-pixel regions, the sub-pixel regions are divided into m sequentially adjacent domains, each domain of one of the first substrate 10 and the second substrate 20 is provided with a photoalignment direction, and each domain of the other substrate is provided with a slit electrode. Wherein, the optical alignment directions of the domains are parallel to each other, and the extending direction of the slits in the slit electrode of each domain is not parallel to the optical alignment direction, wherein, m is an even number larger than 0.

Illustratively, the sub-pixel region shown in fig. 5 is divided into 4 domains. In practical implementation, the specific value of m may be set according to needs, for example, m may be an even number greater than 0, such as 2 or 4. In one embodiment, m is 4, i.e., the sub-pixel area is divided into 4 sequentially adjacent domains.

Fig. 6 is a schematic structural view of a slit electrode. The slit electrode may include an electrode layer and a plurality of slits (slit) opened on the electrode layer in parallel with each other, for example. For example, an electrode layer may be formed on one side of a substrate, the electrode layer may be subjected to patterning treatment to remove an electrode material located at a slit position, and a plurality of slits may be opened in the electrode layer to form slit electrodes. The material of the slit electrode may be a transparent conductive material such as Indium Tin Oxide (ITO) or indium zinc oxide. The slits shown in fig. 6 are oriented horizontally, it being understood that in practice, the direction of extension of the slits may be provided as desired.

Illustratively, the material of the photoalignment layer may be Polyimide (PI), and the photoalignment film may be exposed by using a photoalignment technology, for example, a SUVA iii or SUVA v technology, and a predetermined photoalignment direction is formed on the photoalignment film, thereby forming the photoalignment layer.

Illustratively, the extending direction of the slits in the slit electrode of each domain is not parallel to the photoalignment direction, and the extending direction of the slits in the slit electrode of each domain is at most 90 ° with respect to the photoalignment direction, so that the azimuth angle of the liquid crystal molecules in the liquid crystal layer 30 is at most 45 °.

In the related art, in order to make the liquid crystal layer 30 have a proper azimuth angle, 8 exposures are required, reducing the productivity of the display panel.

In the display panel of the embodiment of the disclosure, each domain of one of the first substrate 10 and the second substrate 20 is provided with a photoalignment direction, each domain of the other substrate is provided with a slit electrode, the photoalignment directions of the domains are parallel to each other, and the extending direction of the slit in the slit electrode of each domain is not parallel to the photoalignment direction. Therefore, the liquid crystal molecules of the liquid crystal layer 30 in the display panel are changed from a single-side mode to a rotating mode, which is beneficial to reducing the azimuth angle of the liquid crystal molecules in each domain area and improving the color cast condition of the display panel; in addition, only one substrate of the first substrate 10 and the second substrate 20 is subjected to optical alignment, so that the total exposure times of the display panel are reduced, and the productivity of the display panel is improved.

Illustratively, in the display panel shown in fig. 5, the photoalignment direction is disposed on the second substrate 20, and the slit electrode is disposed on the first substrate 10. It should be noted that, in other embodiments, the photoalignment direction may be disposed on the first substrate 10, and the slit electrode may be disposed on the second substrate 20.

In one embodiment, as shown in fig. 5, the slit electrodes of each adjacent two domains may be symmetrical to each other, and the rotation states of the liquid crystal molecules of each adjacent two domains are symmetrical in a direction from one of the first substrate 10 and the second substrate 20 toward the other. Therefore, in the display panel, the liquid crystal molecules in each sub-pixel area are turned symmetrically, so that the dark line length of the display panel can be shortened, and the transmittance of the display panel can be improved.

In one embodiment, the slit electrodes of every two adjacent domains are symmetrical to each other, as shown in fig. 5, the slits in the slit electrodes of each domain form a preset included angle θ with the direction of the second central axis 422, where θ is greater than or equal to 45 ° and less than or equal to 90 °, and the second central axis 422 passes through the center of the sub-pixel region.

Fig. 5 is a schematic plan view of a sub-pixel region, and in practice, the sub-pixel region is provided with a liquid crystal layer 30 between the first substrate 10 and the second substrate 20. The direction of the slits in the slit electrode of each domain and the second central axis 422 is set to be a preset angle θ, which is 45 ° - θ <90 °, so that the azimuth angle of the liquid crystal molecules of each domain is smaller than 45 °, that is, the angle between the intermediate liquid crystal molecules of the liquid crystal layer 30 of each domain and the second central plane is smaller than 45 °, and the second central plane is a plane passing through the second central axis 422 and perpendicular to the first substrate 10. In such a setting, the color shift level of the display panel in the direction of the second central axis 422 is better, and the color shift problem of the display panel in the direction of the second central axis 422 is improved.

In one embodiment, 60.ltoreq.θ.ltoreq.80°. The preset included angle θ may be any value between 60 ° and 80 °. For example, the preset included angle may be 60 °, 70 °, or 80 °. By adopting the mode, the azimuth angle of the liquid crystal molecules in each domain area can be positioned at 30-40 degrees, so that the color cast level of the display panel in the direction of the second central axis 422 is further improved, and the display effect is improved.

In one embodiment, the sub-pixel area is divided into four sequentially adjacent first, second, third and fourth domains 411, 412, 413 and 414 along the direction of the first central axis 421, the photo-alignment directions of the four domains are parallel to the second central axis 422, the photo-alignment directions of the first and fourth domains 411 and 414 are toward the outer edges of the sub-pixel area on one side parallel to the first central axis 421, and the photo-alignment directions of the second and third domains 412 and 413 are opposite to the photo-alignment direction of the first domain 411. The first central axis 421 passes through the center of the sub-pixel region, and the second central axis 422 passes through the center of the sub-pixel region and is perpendicular to the first central axis 421.

As shown in fig. 5, the sub-pixel area is divided into four sequentially adjacent first, second, third and fourth domains 411, 412, 413 and 414 from top to bottom along the direction of the first central axis 421, and the photoalignment directions of the four domains are all parallel to the second central axis 422. The photoalignment directions of the first domain 411 and the fourth domain 414 are both toward a first side outer edge 423 (right side outer edge in fig. 5) of the sub-pixel region parallel to the first central axis 421, and the photoalignment directions of the second domain 412 and the third domain 413 are both toward a second side outer edge 424 (left side outer edge in fig. 5) of the sub-pixel region parallel to the first central axis 421.

The photoalignment directions of the first domain 411 and the fourth domain 414 are set to be the same, and the photoalignment directions of the second domain 412 and the third domain 413 are set to be opposite to the photoalignment directions of the first domain 411, which is beneficial to realizing opposite rotation states of liquid crystal molecules of two adjacent domains, and further beneficial to realizing symmetry of rotation states of liquid crystal molecules of two adjacent domains.

Fig. 7a is a schematic view of a sub-pixel region of the second substrate in one embodiment of the display panel shown in fig. 5, and fig. 7b is a schematic view of a sub-pixel region of the first substrate in one embodiment of the display panel shown in fig. 5.

In one embodiment, the display side of the display panel is located on the side of the second substrate 20 facing away from the first substrate 10, the photoalignment direction is disposed on the second substrate 20, and the slit electrode is disposed on the first substrate 10, as shown in fig. 7a and 7 b. The slit electrodes of every two adjacent domains are symmetrical to each other, and the slit of the slit electrode in the first domain 411 forms a preset included angle θ with the direction of the second central axis 422, and the preset included angle θ faces to the opposite side of the optical alignment direction of the first domain 411.

Illustratively, as shown in fig. 7b, the slit electrodes of the first and second domains 411 and 412 are symmetrical to each other, the slit electrodes of the second and third domains 412 and 413 are symmetrical to each other, and the slit electrodes of the third and fourth domains 413 and 414 are symmetrical to each other. The predetermined angle θ formed by the slits of the slit electrode in the first domain 411 and the second central axis 422 faces to the left, and the photoalignment direction of the first domain 411 faces to the first side outer edge 423 (the right side outer edge), so that the predetermined angle θ formed by the slits of the slit electrode in the first domain 411 and the second central axis 422 faces to the opposite side of the photoalignment direction of the first domain 411, i.e., faces to the second side outer edge 424 (the left side outer edge).

Fig. 7c is a schematic diagram of turning the liquid crystal molecules on the surface of the second substrate shown in fig. 7a, fig. 7d is a schematic diagram of turning the liquid crystal molecules on the surface of the first substrate shown in fig. 7b, fig. 7e is a schematic diagram of turning the liquid crystal molecules in an intermediate state of the liquid crystal layer after the second substrate shown in fig. 7a and the first substrate shown in fig. 7b are attached, and fig. 7c, fig. 7d and fig. 7e are all views along the direction a in fig. 1. As can be seen from fig. 7c, 7d and 7e, from the second substrate 20 toward the first substrate 10, the liquid crystal molecules of the first domain 411 rotate clockwise, the liquid crystal molecules of the second domain 412 rotate counterclockwise, the liquid crystal molecules of the third domain 413 rotate clockwise, the liquid crystal molecules of the fourth domain 414 rotate counterclockwise, the rotation directions of the liquid crystal molecules of the adjacent two domains are opposite, and the rotation states of the liquid crystal molecules of the adjacent two domains are symmetrical.

Fig. 8 is a schematic flow chart of forming the second substrate shown in fig. 7a, wherein the film surface, i.e. the alignment layer, of the second substrate 20 in fig. 8 faces upward. As shown in fig. 8, four domains may be exposed by using PBS, and the photoalignment directions of the first domain 411 and the fourth domain 414 are both toward the first side outer edge 423 and parallel to the second central axis 422, and the photoalignment directions of the second domain 412 and the third domain 413 are both toward the second side outer edge 424 and parallel to the second central axis 422, so that the photoalignment direction of the second substrate 20 shown in fig. 7a is obtained after the second substrate 20 is exposed for 4 times.

Fig. 9 is an a-direction view of the display panel shown in fig. 1 in another embodiment, and the photoalignment direction and slit electrode of each domain are shown in fig. 9. As shown in fig. 9, the sub-pixel area is divided into four sequentially adjacent first, second, third and fourth domains 411, 412, 413 and 414 from top to bottom along the direction of the first central axis 421, and the photoalignment directions of the four domains are all parallel to the second central axis 422. The photoalignment directions of the first domain 411 and the fourth domain 414 are both toward a second side outer edge 424 (left side outer edge in fig. 9) of the sub-pixel region parallel to the first central axis 421, and the photoalignment directions of the second domain 412 and the third domain 413 are both toward a first side outer edge 423 (right side outer edge in fig. 5) of the sub-pixel region parallel to the first central axis 421.

Fig. 10a is a schematic view of a sub-pixel region of the second substrate in one embodiment of the display panel shown in fig. 9, and fig. 10b is a schematic view of a sub-pixel region of the first substrate in one embodiment of the display panel shown in fig. 9. In one embodiment, the display side of the display panel is located at a side of the second substrate 20 facing away from the first substrate 10, the photoalignment direction is disposed at the second substrate 20, and the slit electrode is disposed at the first substrate 10, as shown in fig. 10a and 10 b. The slit electrodes of every two adjacent domains are symmetrical to each other, and the slit of the slit electrode in the first domain 411 forms a preset included angle θ with the direction of the second central axis 422, and the preset included angle θ faces to the opposite side of the optical alignment direction of the first domain 411.

As shown in fig. 10a and 10b, the slit electrodes of the first and second domains 411 and 412 are symmetrical to each other, the slit electrodes of the second and third domains 412 and 413 are symmetrical to each other, and the slit electrodes of the third and fourth domains 413 and 414 are symmetrical to each other. The predetermined angle θ formed by the slits of the slit electrode in the first domain 411 and the second central axis 422 faces to the right, and the photoalignment direction of the first domain 411 faces to the second side outer edge 424 (the left side outer edge), so that the predetermined angle θ formed by the slits of the slit electrode in the first domain 411 and the second central axis 422 faces to the opposite side of the photoalignment direction of the first domain 411, i.e., faces to the first side outer edge 423 (the right side outer edge).

Fig. 10c is a schematic diagram illustrating the turning of the liquid crystal molecules on the surface of the second substrate shown in fig. 10a, fig. 10d is a schematic diagram illustrating the turning of the liquid crystal molecules on the surface of the first substrate shown in fig. 10b, fig. 10e is a schematic diagram illustrating the turning of the liquid crystal molecules in an intermediate state of the liquid crystal layer after the second substrate shown in fig. 10a and the first substrate shown in fig. 10b are attached, and fig. 10c, fig. 10d and fig. 10e are all views along the direction a in fig. 1. As can be seen from fig. 10c, 10d and 10e, from the second substrate 20 toward the first substrate 10, the liquid crystal molecules of the first domain 411 are rotated counterclockwise, the liquid crystal molecules of the second domain 412 are rotated clockwise, the liquid crystal molecules of the third domain 413 are rotated counterclockwise, the liquid crystal molecules of the fourth domain 414 are rotated clockwise, the rotation directions of the liquid crystal molecules of the adjacent two domains are opposite, and the rotation states of the liquid crystal molecules of the adjacent two domains are symmetrical.

Fig. 11 is a schematic flow chart of forming the second substrate shown in fig. 10a, wherein the film surface, i.e. the alignment layer, of the second substrate 20 in fig. 11 faces upward. As shown in fig. 11, four domains may be exposed by using PBS, and the photoalignment directions of the first domain 411 and the fourth domain 414 are both toward the second side outer edge 424 and parallel to the second central axis 422, and the photoalignment directions of the second domain 412 and the third domain 413 are both toward the first side outer edge 423 and parallel to the second central axis 422, so that the photoalignment direction of the second substrate 20 shown in fig. 10a is obtained after 4 times of exposure of the second substrate 20.

In one embodiment, as shown in FIG. 7b and FIG. 10b, the preset angle θ is 45+.θ <90 °. Illustratively, 60 θ+.ltoreq.80 °.

Therefore, the display panels shown in fig. 5 and 9 require 4 exposure times in total, and compared with 8 exposure times, the exposure times of the display panel in the embodiment of the disclosure are greatly reduced, and the productivity of the display panel is improved.

Fig. 12 is an a-direction view of the display panel of fig. 1 in another embodiment, and fig. 12 shows the photoalignment direction of each domain and the slit electrode. In one embodiment, as shown in fig. 12, the photoalignment direction is set on the first substrate 10, the slit electrodes are set on the second substrate 20, the slit electrodes of every two adjacent domains are symmetrical to each other, the slits of the slit electrodes in the first domain 411 form a preset included angle θ with the direction of the second central axis 422, and the preset included angle θ faces the same side as the photoalignment direction of the first domain 411.

As shown in fig. 12, the sub-pixel area is divided into four sequentially adjacent first, second, third and fourth domains 411, 412, 413 and 414 from top to bottom along the direction of the first central axis 421, and the photoalignment directions of the four domains are all parallel to the second central axis 422. The photoalignment directions of the first domain 411 and the fourth domain 414 are both toward a second side outer edge 424 (left side outer edge in fig. 12) of the sub-pixel region parallel to the first central axis 421, and the photoalignment directions of the second domain 412 and the third domain 413 are both toward a first side outer edge 423 (right side outer edge in fig. 12) of the sub-pixel region parallel to the first central axis 421.

As shown in fig. 12, the predetermined angle θ formed by the slits of the slit electrodes in the first domain 411 and the second central axis 422 faces to the left, and the photoalignment direction of the first domain 411 faces to the second outer edge 424 (left outer edge), so that the predetermined angle θ formed by the slits of the slit electrodes in the first domain 411 and the second central axis 422 faces to the same side as the photoalignment direction of the first domain 411, i.e. faces to the second outer edge 424 (left outer edge).

In the embodiment shown in fig. 5, 9 and 12, one of the first substrate 10 and the second substrate 20 is provided with a light alignment direction, and the other is provided with a slit electrode, and the liquid crystal molecules complete azimuthal rotation under the action of the alignment force of the light alignment direction and the electric field force of the slit electrode, so that the liquid crystal layer 30 forms 4 domain divisions, the azimuthal angle of each domain is less than 45 °, the color cast level of the display panel in the direction of the second central axis 422 is improved, and the display effect is improved.

The principle of turning the liquid crystal molecules will be briefly described below by taking the display panel shown in fig. 5 as an example. Fig. 13a is a schematic view of a second domain electric field force cross section and a schematic view of liquid crystal molecule turning, fig. 13b is a schematic view of a second domain electric field force top view and a schematic view of liquid crystal molecule turning, in fig. 13a and 13b, the first substrate 10 may be an array substrate (TFT substrate), and the second substrate 20 may be a color film substrate (CF substrate). As shown in fig. 13a and 13b, the second substrate 20 is exposed, the liquid crystal molecules are tilted according to the alignment force direction, the slit electrode is disposed on the first substrate 10, and the liquid crystal molecules complete azimuthal rotation under the alignment force of the second substrate 20 and the electric field force of the slit electrode of the first substrate 10, so as to form 4 domain divisions.

FIG. 14 is an A-direction view of the display panel of FIG. 1 in another embodiment, the photoalignment direction and slit electrodes of each domain being shown in FIG. 14; fig. 15a is a schematic view of a sub-pixel area of the second substrate in one embodiment of the display panel shown in fig. 14, and fig. 15b is a schematic view of a sub-pixel area of the first substrate in one embodiment of the display panel shown in fig. 14. In one embodiment, as shown in fig. 14, the sub-pixel region is divided into a first domain 411, a second domain 412, a third domain 413 and a fourth domain 414, which are sequentially adjacent, by a first central axis 421 and a second central axis 422, and the photoalignment of each domain is parallel to one of the first central axis 421 or the second central axis 422. The slits in the slit electrode of each domain form a preset included angle θ with the direction of the second central axis 422, and the preset included angle θ of each domain is opposite to the outer edge of the corresponding domain parallel to the first central axis 421. The first central axis 421 passes through the center of the sub-pixel region, and the second central axis 422 passes through the center of the sub-pixel region and is perpendicular to the first central axis 421.

In fig. 14, the first, second, third and fourth domains 411, 412, 413 and 414 are arranged counterclockwise, and in other embodiments, four domains may be arranged in a clockwise direction.

Illustratively, as shown in fig. 14, the photoalignment of each domain is parallel to the second central axis 422. The predetermined angle θ of the first domain 411 is toward an outer edge (right outer edge) of the first domain 411 parallel to the first central axis 421, the predetermined angle θ of the second domain 412 is toward a left outer edge, the predetermined angle θ of the third domain 413 is toward a left outer edge, and the predetermined angle θ of the fourth domain 414 is toward a right outer edge.

Illustratively, the directions of trending of the photoalignment directions of the domains are the same, the trending directions including towards the outside of the sub-pixel area and towards the inside of the sub-pixel area. In the embodiment shown in fig. 14, the photoalignment direction of each domain is towards the inner side of the sub-pixel area.

In one embodiment, the display side of the display panel is located at a side of the second substrate 20 facing away from the first substrate 10, the photoalignment direction is disposed at the second substrate 20, and the slit electrode is disposed at the first substrate 10, as shown in fig. 15a and 15 b. The slit electrodes of every two adjacent domains are symmetrical to each other, and the optical alignment directions of the domains are parallel to one central axis of the first central axis 421 or the second central axis 422 and face the other central axis.

As shown in fig. 15a and 15b, the slit electrodes of the first and second domains 411 and 412 are symmetrical to each other, the slit electrodes of the second and third domains 412 and 413 are symmetrical to each other, and the slit electrodes of the third and fourth domains 413 and 414 are symmetrical to each other. The photo-alignment directions of the domains are parallel to the second central axis 422 and face the first central axis 421.

Fig. 15c is a schematic diagram illustrating the turning of the liquid crystal molecules on the surface of the second substrate shown in fig. 15a, fig. 15d is a schematic diagram illustrating the turning of the liquid crystal molecules on the surface of the first substrate shown in fig. 15b, fig. 15e is a schematic diagram illustrating the turning of the liquid crystal molecules in an intermediate state of the liquid crystal layer after the second substrate shown in fig. 15a and the first substrate shown in fig. 15b are attached, and fig. 15c, fig. 15d and fig. 15e are all views along the direction a in fig. 1. As can be seen from fig. 15c, 15d and 15e, from the second substrate 20 toward the first substrate 10, the liquid crystal molecules of the first domain 411 are rotated counterclockwise, the liquid crystal molecules of the second domain 412 are rotated clockwise, the liquid crystal molecules of the third domain 413 are rotated counterclockwise, the liquid crystal molecules of the fourth domain 414 are rotated clockwise, the rotation directions of the liquid crystal molecules of the adjacent two domains are opposite, and the rotation states of the liquid crystal molecules of the adjacent two domains are symmetrical.

Fig. 16 is a schematic flow chart illustrating the formation of the second substrate shown in fig. 15a, wherein the film surface, i.e. the alignment layer, of the second substrate 20 in fig. 16 faces upward. As shown in fig. 16, four domains may be exposed using WGP 45 ° polarizers, each exposure in the direction shown in fig. 16. The first exposure is performed to expose the first domain 411 and the fourth domain 414 in a direction gradually approaching from the second side outer edge 424 toward the first central axis 421 to the lower side outer edge parallel to the second central axis 422; a second exposure, exposing the first domain 411 and the fourth domain 414 in a direction gradually away from the lower outer edge parallel to the second central axis 422 from the second outer edge 424 toward the first central axis 421; a third exposure, exposing the second domains 412 and the third domains 413 in a direction gradually approaching from the lower outer edge parallel to the second central axis 422 toward the first central axis 421 from the first outer edge 423; the second domain 412 and the third domain 413 are exposed for the fourth exposure in a direction gradually away from the lower outer edge parallel to the second central axis 422 from the first outer edge 423 toward the first central axis 421. Thus, the photoalignment direction of the second substrate 20 shown in fig. 15a is obtained after 4 times of exposure of the second substrate 20.

FIG. 17 is an A-direction view of the display panel of FIG. 1 in another embodiment, the photoalignment direction and slit electrodes of each domain being shown in FIG. 17; fig. 18a is a schematic view of a sub-pixel region of the second substrate in one embodiment of the display panel shown in fig. 17, and fig. 18b is a schematic view of a sub-pixel region of the first substrate in one embodiment of the display panel shown in fig. 17.

Illustratively, as shown in fig. 17 and 18a, the photoalignment of each domain is parallel to the first central axis 421 and faces the second central axis 422.

Fig. 18c is a schematic diagram of turning the liquid crystal molecules on the surface of the second substrate shown in fig. 18a, fig. 18d is a schematic diagram of turning the liquid crystal molecules on the surface of the first substrate shown in fig. 18b, fig. 18e is a schematic diagram of turning the liquid crystal molecules in an intermediate state of the liquid crystal layer after the second substrate shown in fig. 18a and the first substrate shown in fig. 18b are attached, and fig. 18c, fig. 18d and fig. 18e are all a view along the direction a in fig. 1. As can be seen from fig. 18c, 18d and 18e, from the second substrate 20 toward the first substrate 10, the liquid crystal molecules of the first domain 411 rotate clockwise, the liquid crystal molecules of the second domain 412 rotate counterclockwise, the liquid crystal molecules of the third domain 413 rotate clockwise, the liquid crystal molecules of the fourth domain 414 rotate counterclockwise, the rotation directions of the liquid crystal molecules of the adjacent two domains are opposite, and the rotation states of the liquid crystal molecules of the adjacent two domains are symmetrical.

Fig. 19 is a schematic flow chart of forming the second substrate shown in fig. 18a, wherein the film surface, i.e. the alignment layer, of the second substrate 20 in fig. 19 faces upward. As shown in fig. 19, four domains may be exposed using WGP 45 ° polarizers, each exposure in the direction shown in fig. 19. A first exposure, exposing the first domain 411 and the second domain 412 in a direction from an upper outer edge parallel to the second central axis 422 toward the second central axis 422 and gradually away from the second outer edge 424; a second exposure, exposing the first domain 411 and the second domain 412 in a direction from an upper outer edge parallel to the second central axis 422 toward the second central axis 422 and gradually approaching the second outer edge 424; a third exposure, exposing the third domain 413 and the fourth domain 414 in a direction from the lower outer edge parallel to the second central axis 422 toward the second central axis 422 and gradually away from the second outer edge 424; the fourth exposure exposes the third domain 413 and the fourth domain 414 from the lower outer edge parallel to the second central axis 422 toward the second central axis 422 and gradually approaching the second outer edge 424. Thus, the photoalignment direction of the second substrate 20 shown in fig. 18a is obtained after 4 times of exposure of the second substrate 20.

In one embodiment, as shown in FIGS. 15b and 18b, the preset included angle θ is 45+.gtoreq.θ <90 °. Illustratively, 60 θ+.ltoreq.80 °.

In the display panel shown in fig. 17, in the case of 45 ° < θ <90 °, the azimuth angle of each domain is greater than 45 °, that is, the angle between the intermediate-state liquid crystal molecules of each domain and the second central axis 422 is greater than 45 °. However, the angle between the intermediate liquid crystal molecules of each domain and the first central axis 421 is smaller than 45 °, so that the color shift level of the display panel shown in fig. 17 in the direction of the first central axis 421 is better.

Therefore, the display panels shown in fig. 14 and 17 require 4 exposure times in total, and compared with 8 exposure times, the exposure times of the display panel in the embodiment of the disclosure are greatly reduced, and the productivity of the display panel is improved.

Fig. 20 is an a-direction view of the display panel of fig. 1 in another embodiment, and fig. 20 shows photoalignment reversal and slit electrodes of each domain. In one embodiment, as shown in fig. 20, the photoalignment direction is disposed on the first substrate 10, and the slit electrodes are disposed on the second substrate 20, and the slit electrodes of every two adjacent domains are symmetrical to each other. The photoalignment direction of each domain is parallel to one of the first central axis 421 and the second central axis 422, and faces away from the other central axis.

As shown in fig. 20, the photoalignment directions of the domains are parallel to the second central axis 422 and face away from the first central axis 421. In another embodiment, the photoalignment directions of the domains may be parallel to the first central axis 421 and face away from the second central axis 422.

In the embodiments shown in fig. 14, 17 and 20, one of the first substrate 10 and the second substrate 20 is provided with a photoalignment direction, and the other is provided with a slit electrode, and the liquid crystal molecules complete azimuthal rotation under the effect of the alignment force of the photoalignment direction and the electric field force of the slit electrode, so that the liquid crystal layer 30 forms 4 domain divisions. The azimuth angle of each domain of fig. 14 and 20 is smaller than 45 °, which improves the color shift level of the display panel in the direction of the second central axis 422 and improves the display effect.

The principle of turning the liquid crystal molecules will be briefly described below by taking the display panel shown in fig. 14 as an example. Fig. 21a is a schematic view of the third domain electric field force cross section and a schematic view of the liquid crystal molecule turning, and fig. 21b is a schematic view of the third domain electric field force top view and a schematic view of the liquid crystal molecule turning. In fig. 21a and 21b, the first substrate 10 is an array substrate (TFT substrate), the second substrate 20 is a color film substrate (CF substrate), as shown in fig. 21a and 21b, the CF substrate side is exposed, the liquid crystal molecules are tilted according to the alignment force direction, the slit electrodes are disposed on the array substrate side, and the liquid crystal molecules complete azimuthal rotation under the action of the CF substrate alignment force and the TFT substrate slit electrode electric field force, so as to form 4 domain divisions.

Fig. 22a is a schematic diagram of a slit electrode in a display panel according to an embodiment of the disclosure. FIG. 22b is a schematic view of a slit electrode in a display panel according to another embodiment of the disclosure; fig. 22c is a schematic diagram of a slit electrode in a display panel according to another embodiment of the disclosure.

As shown in fig. 22a, in one embodiment, the slit electrode may further include a first central slit 425, the first central slit 425 passing through the center of the sub-pixel region and being parallel to the first central axis 421.

As shown in fig. 22b, in one embodiment, the slit electrode may further include a second central slit 426, the second central slit 426 passing through the center of the sub-pixel region and being parallel to the second central axis 422.

As shown in fig. 22c, in one embodiment, the slit electrode may further include a first center slit 425 and a second center slit 426, the first center slit 425 passing through the center of the sub-pixel region and being parallel to the first center axis 421, and the second center slit 426 passing through the center of the sub-pixel region and being parallel to the second center axis 422.

It should be noted that, the length of the first central slit 425 and the length of the second central slit 426 may be set according to needs, for example, the first central slit 425 may not block the electrode layers on the left and right sides of the sub-pixel region, and the second central slit 426 may not block the electrode layers on the upper and lower sides of the sub-pixel region, so as to ensure connection of the electrode layers in the sub-pixel region.

Illustratively, the photoalignment direction may be disposed on one of the first substrate 10 and the second substrate 20, and the slit electrode may be disposed on the other substrate. For example, the photoalignment direction is disposed on the second substrate 20, the slit electrode is disposed on the first substrate 10, the second substrate 20 may have a structure as shown in fig. 15a, and the slit electrode on the first substrate 10 may have a structure as shown in fig. 22a, 22b, or 22 c.

Fig. 23a is a schematic view of an electric field force cross section oblique viewing angle and a schematic view of liquid crystal molecule turning of a first center slit of the display panel adopting the structure shown in fig. 15a and 22c, wherein in fig. 23a, the first substrate 10 is a TFT substrate, and the second substrate 20 is a CF substrate. As shown in fig. 23a, the effect of providing the first center slit 425 is inferior to that of not providing the first center slit 425 because the liquid crystal molecules are unstable and the dark line area is relatively large under the interaction of the electric field force and the liquid crystal molecules are opposite to the liquid crystal molecules b under the alignment force.

Fig. 23b is a schematic view of an electric field force cross section oblique viewing angle and a schematic view of liquid crystal molecule turning of a second center slit of the display panel adopting the structure shown in fig. 15a and 22c, wherein in fig. 23b, the first substrate 10 is a TFT substrate, and the second substrate 20 is a CF substrate. As shown in fig. 23b, the rotation direction c of the liquid crystal molecules is opposite to the rotation direction d of the liquid crystal molecules under the action of the electric field in the domain, and the liquid crystal molecules are unstable under the interaction, and the dark line area is relatively large, so that the effect of providing the second central slit 426 is poorer than that of not providing the second central slit 426.

Fig. 23c is a schematic view of an electric field force cross section oblique viewing angle and a schematic view of liquid crystal molecule turning of a first center slit of the display panel adopting the structure shown in fig. 18a and 22c, wherein in fig. 23c, the first substrate 10 is a TFT substrate, and the second substrate 20 is a CF substrate. As shown in fig. 23c, the liquid crystal molecules are unstable under the interaction of the electric field force of the first central slit 425 and the electric field force of the domain region, and the dark line area is relatively large, so that the effect of providing the first central slit 425 is poorer than that of not providing the first central slit 425.

Fig. 23d is a schematic view of an electric field force cross section oblique viewing angle and a schematic view of liquid crystal molecule turning of a second center slit of the display panel adopting the structure shown in fig. 18a and 22c, wherein in fig. 23d, the first substrate 10 is a TFT substrate, and the second substrate 20 is a CF substrate. As shown in fig. 23d, the liquid crystal molecules are unstable under the interaction of the electric field force and the liquid crystal molecules in the direction c opposite to the direction d in which the alignment force is applied, and the dark line area is relatively large, so that the effect of providing the second center slit 426 is inferior to that of not providing the second center slit 426.

In the embodiments shown in fig. 14, 17 and 20, the substrate may be exposed by using the SUVA v mode, which may be suitable for exposure alignment of a large substrate, the large substrate may be divided into a plurality of substrates with different PPI, and exposure may be performed four times, so that exposure alignment of a plurality of substrates on the large substrate may be realized, and production efficiency may be improved.

Based on the inventive concept of the foregoing embodiments, the present disclosure also provides a display device including the display panel adopting the embodiments. The display device may be: any product or component with display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.

In the description of the present specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present disclosure.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present disclosure, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present disclosure, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.

In this disclosure, unless expressly stated or limited otherwise, a first feature being "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.

The above disclosure provides many different embodiments or examples for implementing different structures of the disclosure. The components and arrangements of specific examples are described above in order to simplify the present disclosure. Of course, they are merely examples and are not intended to limit the present disclosure. Furthermore, the present disclosure may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.

The above is merely a specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art can easily think of various changes or substitutions within the technical scope of the disclosure, which should be covered in the protection scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. The display panel is characterized by comprising a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate and the second substrate are oppositely arranged, the liquid crystal layer is positioned between the first substrate and the second substrate, the display panel comprises a plurality of sub-pixel areas, the sub-pixel areas are divided into m sequentially adjacent domain areas, each domain area of one substrate of the first substrate and the second substrate is provided with a light alignment direction, each domain area of the other substrate is provided with a slit electrode, the light alignment directions of the domain areas are parallel to each other, and the extending direction of a slit in the slit electrode of each domain area is not parallel to the light alignment direction, wherein m is an even number larger than 0;

the slit electrodes of each adjacent two domains are symmetrical to each other, and the rotation states of the liquid crystal molecules of each adjacent two domains are symmetrical in a direction from one of the first substrate and the second substrate toward the other.

2. The display panel according to claim 1, wherein the slit electrodes of each two adjacent domains are symmetrical to each other, and the slits in the slit electrodes of each domain form a predetermined angle θ with the direction of the second central axis, which passes through the center of the sub-pixel region, of 45 ° or more and θ or less than 90 °.

3. The display panel according to claim 2, wherein θ is 60 ° or less and 80 °.

4. A display panel according to any one of claims 1-3, wherein the sub-pixel region is divided into four sequentially adjacent first, second, third and fourth domains along a direction of a first central axis, the photo-alignment directions of the four domains are all parallel to the second central axis, the photo-alignment directions of the first and fourth domains are all directed to an outer edge of the sub-pixel region on a side parallel to the first central axis, and the photo-alignment directions of the second and third domains are all opposite to the photo-alignment directions of the first domain;

5. The display panel according to claim 4, wherein the display side of the display panel is located at a side of the second substrate facing away from the first substrate, the photoalignment direction is set at the second substrate, the slit electrodes are set at the first substrate, the slit electrodes of every two adjacent domains are symmetrical to each other, the slits of the slit electrodes in the first domain form a preset included angle θ with a direction in which the second central axis is located, and the preset included angle θ faces a side opposite to the photoalignment direction of the first domain.

6. The display panel according to claim 4, wherein the display side of the display panel is located at a side of the second substrate facing away from the first substrate, the photoalignment direction is set at the first substrate, the slit electrodes are set at the second substrate, the slit electrodes of every two adjacent domains are symmetrical to each other, the slits of the slit electrodes in the first domain form a preset included angle θ with a direction in which the second central axis is located, and the preset included angle θ faces the same side as the photoalignment direction of the first domain.

7. A display panel according to any one of claims 1-3, wherein the sub-pixel region is divided by a first central axis and a second central axis into a first domain, a second domain, a third domain and a fourth domain which are adjacent in sequence, the photoalignment of each domain being parallel to one of the first central axis or the second central axis;

The slits in the slit electrodes of each domain form a preset included angle theta with the direction of the second central axis, and the preset included angle theta of each domain faces the outer edge of the corresponding domain, which is parallel to the first central axis;

8. The display panel according to claim 7, wherein the display side of the display panel is located on a side of the second substrate facing away from the first substrate, the photoalignment direction is disposed on the second substrate, the slit electrodes are disposed on the first substrate, the slit electrodes of every two adjacent domains are symmetrical to each other, and the photoalignment directions of the domains are parallel to one of the first central axis or the second central axis and face the other central axis.

9. The display panel according to claim 7, wherein the display side of the display panel is located on a side of the second substrate facing away from the first substrate, the photoalignment direction is disposed on the first substrate, the slit electrodes are disposed on the second substrate, the slit electrodes of every two adjacent domains are symmetrical to each other, and the photoalignment directions of the domains are parallel to one of the first central axis and the second central axis and face a direction away from the other central axis.

10. The display panel of claim 7, wherein the slit electrode further comprises a first center slit passing through a center of the subpixel region and parallel to the first center axis.

11. The display panel of claim 7, wherein the slit electrode further comprises a second center slit passing through a center of the sub-pixel region and parallel to the second center axis.

12. A display device comprising the display panel of any one of claims 1-11.