CN112904621B - Light alignment light path system of liquid crystal display tri-domain alignment layer - Google Patents

Abstract

The invention relates to a photo-alignment light path system of a liquid crystal display tri-domain alignment layer. Comprising the following steps: the light source module is used for providing three groups of tri-domain alignment light sources with different incidence directions; the mask plate module comprises a mask plate, and the mask plate comprises a light transmission area and a non-light transmission area; the loading platform is used for loading the substrate to be aligned; the substrate to be aligned comprises three groups of alignment areas with different alignment angles; the alignment angle corresponds to the incidence direction of the tri-domain alignment light source; the mask plate is arranged between the loading platform and the light source module, and the projection of the light transmission area of the mask plate on the substrate to be aligned is positioned in the alignment area in the middle of the same display pixel; under the condition that the relative positions of the mask and the substrate to be aligned are kept unchanged, three groups of tri-domain alignment light sources provided by the light source module penetrate through the light transmission area of the mask at the same time and are projected to alignment areas of different groups. The invention can solve the problem of alignment error of the mask plate in the tri-domain photo-alignment process, reduce the exposure times and increase the productivity.

Description

A light alignment optical path system for a liquid crystal display three-domain alignment layer

Technical field

The invention relates to the field of optical alignment, and in particular to an optical alignment optical path system for a three-domain alignment layer of a liquid crystal display.

Background technique

70% of the information humans obtain from the outside world comes from vision. With the development of science and technology, displays have become an important tool for information transmission and human-machine communication. Among contemporary display technologies, the one with the most mature development and the highest market share is Thin Film Transistor-Liquid Crystal Display (TFT-LCD). The working principle of TFT-LCD is that under the action of an electric field, the internal liquid crystal molecules will change in arrangement. This phenomenon is called the electro-optical effect. The change in the molecular structure of the liquid crystal affects the change of light passing through it, which can then be manifested as a change in light and dark through the action of the polarizer. Together with the color filter (Color Filter, CF), people can achieve final control through the control of the electric field. The grayscale and brightness of light change to achieve the purpose of displaying images. In TFT-LCD devices, in order to improve the response speed, the liquid crystal molecules need to be neatly arranged at the electrode interface and form a certain pretilt angle. Therefore, during the production process, the alignment film on the surface of the TFT substrate and the CF substrate needs to be aligned. The current alignment technology is divided into friction alignment and photo alignment. Photo alignment technology mainly uses ultraviolet light for alignment materials with high light sensitivity and good stability. Compared with friction alignment technology, photo alignment technology has the advantages of non-contact, no pollution, no static electricity, and can achieve multi-domain alignment, so it has been widely used.

The existing three-domain photo-alignment technology uses contact exposure or near exposure, which requires three alignments and three exposures. On the one hand, there are errors in alignment, which may cause adjacent alignment areas to overlap multiple alignments or deviate from each other, leaving unaligned areas. On the other hand, three exposures increase the process time and reduce production capacity.

Contents of the invention

The purpose of the present invention is to provide a photo-alignment optical path system for a three-domain alignment layer of a liquid crystal display, aiming to solve the problem of alignment errors of the mask during the three-domain photo-alignment process and to reduce the number of exposures and increase production capacity.

In order to achieve the above object, the technical solution of the present invention is: a light alignment optical path system for a liquid crystal display three-domain alignment layer, including:

The light source module is used to provide three groups of three-domain aligned light sources with different incident directions;

Mask module, the mask module includes a mask, and the mask includes a light-transmitting area and a non-light-transmitting area;

A loading platform is used to load the substrate to be aligned; the substrate to be aligned includes three groups of alignment areas with different alignment angles; the alignment angle corresponds to the incident direction of the three-domain alignment light source;

The light-transmitting area of each mask corresponds to a display pixel of the substrate to be aligned, and each display pixel includes three alignment areas with different alignment angles; the mask is disposed between the loading platform and the light source module, and the mask The projection of the light-transmitting area on the substrate to be aligned is located in the alignment area in the middle of the same display pixel; among them, while maintaining the relative position of the mask and the substrate to be aligned unchanged, the three sets of three-domain alignment provided by the light source module The light source passes through the light-transmitting area of the mask and is projected to different groups of alignment areas at the same time;

The incident directions of the three groups of three-domain aligned light sources are respectively incident at the first incident angle θ ₁ , the second incident angle θ ₂ and the third incident angle θ ₃ . The first incident angle θ ₁ and the second incident angle θ ₂ and the third incident angle θ ₃ is the angle between the incident direction and the normal line of the substrate to be aligned, and θ ₂ =-θ ₁ , θ ₃ =0;

The distance between the mask and the substrate to be aligned on the loading platform is the first distance d;

The alignment widths of the three alignment areas located in the same display pixel are all the first width p, and the gaps between two adjacent alignment areas located in the same display pixel are all the first gap q; where, if they are located in the same display pixel, the alignment widths are all the first width p. If two adjacent alignment areas in a display pixel overlap, then the first gap q<0;

The first incident angle θ ₁ , the second incident angle θ ₂ , the third incident angle θ ₃ , the first distance d, the first width p and the first gap q have d=(p+q)×|cotθ ₁ | Relationship.

In an embodiment of the present invention, the mask module is controlled to keep the first distance d constant; the light source module is controlled to adjust the first incident angle θ ₁ and the second incident angle θ ₂ so that the three groups The three-domain alignment light source is projected onto different groups of alignment areas.

In an embodiment of the present invention, the light source module is controlled to keep the first incident angle θ ₁ and the second incident angle θ ₂ unchanged; the mask module is controlled to adjust the first distance d so that the three groups The three-domain alignment light source is projected onto different groups of alignment areas.

In an embodiment of the present invention, the three alignment areas included in the display pixel are rectangles of equal size, and the alignment area and the light-transmitting area are of the same size.

In an embodiment of the present invention, a plurality of display pixels constitute a column of pixel groups, and the pixel groups in a column are divided into a left alignment block group, a middle alignment block group and a right alignment block group, and the left alignment block group, the middle alignment block group The group, the right alignment area group and the light-transmitting area are equal-width rectangles.

In an embodiment of the present invention, when the light source module aligns the substrate to be aligned, the light source module simultaneously generates three groups of three-domain alignment light sources with different incident directions to align the substrate to be aligned.

In an embodiment of the present invention, the light source module includes: an initial light source lamp, a refractor and a reflector;

The initial light source emitted by the initial light source lamp is divided into three groups of three-domain light alignment light sources with different incident directions through the refractor and the reflector.

In an embodiment of the present invention, the mask module includes:

A lifting mechanism, the lifting mechanism is used to change the distance between the mask and the substrate to be aligned by transporting the mask.

Compared with the existing technology, the present invention has the following beneficial effects:

1. In the present invention, the mask is disposed between the loading platform and the light source module, and the light-transmitting area of the mask is located in the alignment area in the middle of the same display pixel where the projection of the substrate to be aligned is located. By arranging the light-transmitting area directly above the middle alignment area of the same display pixel, it is ensured that the light-transmitting area can simultaneously align three alignment areas with different alignment angles, thereby improving alignment efficiency.

2. In the present invention, while maintaining the relative position of the mask and the substrate to be aligned unchanged, the three groups of three-domain alignment light sources provided by the light source module pass through the light-transmitting area of the mask at the same time and are projected to different groups. Other alignment areas. It has the following advantages: 1. During the alignment process, the relative position of the mask module and the substrate to be aligned remains unchanged. Compared with the existing technology, there is no need to adjust the mask for alignment, thereby avoiding alignment errors. As a result, some positions in the alignment area will be repeatedly aligned by light sources in different directions or some positions in the alignment area will not be aligned. Two or three groups of three-domain alignment light sources pass through the light-transmitting area of the mask module at the same time and are projected to different groups of alignment areas. In this way, three groups of alignment areas with different alignment angles can be aligned simultaneously with one exposure, which reduces the number of exposures compared to the existing technology, thereby increasing production efficiency.

In summary, the present invention not only solves the alignment problem in the three-domain optical alignment process, ensures the accuracy of alignment, but also improves alignment efficiency.

Description of the drawings

Figure 1 is a schematic structural diagram of an optical alignment optical path system of a three-domain alignment layer of a liquid crystal display provided by a specific embodiment of the present invention;

Figure 2 is a schematic diagram of the alignment optical path in the first specific case provided by a specific embodiment of the present invention;

Figure 3 is a schematic diagram of the alignment optical path in the second specific situation provided by a specific embodiment of the present invention;

Figure 4 is a schematic diagram of the alignment optical path in the third specific case provided by a specific embodiment of the present invention;

Figure 5 is a schematic diagram of the relationship between the alignment area, the rectangular display area and the light-transmitting area provided by a specific embodiment of the present invention;

Figure 6 is a schematic diagram of the relationship between the alignment area, the irregular-shaped display area and the light-transmitting area provided by a specific embodiment of the present invention;

Figure 7 is a schematic diagram of the relationship between the pixel group and the light-transmitting area provided by a specific embodiment of the present invention;

Figure 8 is a schematic diagram of a light source forming three sets of light paths in different directions provided by a specific embodiment of the present invention.

Detailed ways

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

The invention discloses a light alignment optical path system for a three-domain alignment layer of a liquid crystal display. Those skilled in the art can learn from the content of this article and appropriately improve the technical details for implementation. It should be noted that all similar substitutions and modifications are obvious to those skilled in the art, and they are deemed to be included in the present invention. The methods and applications of the present invention have been described through preferred embodiments. Relevant persons can obviously make modifications or appropriate changes and combinations to the methods and applications described herein without departing from the content, spirit and scope of the present invention to achieve and Apply the technology of this invention.

Aligning the liquid crystal during the production process of LCD displays is an important step to make the display screen better. Optical alignment technology has the advantages of non-contact, no pollution, and no static electricity, and is widely used in the alignment of LCD screens. The commonly used three-domain light alignment technology includes: moving the mask so that the light-transmitting area of the mask is aligned with the alignment area of the first set of alignment angles, and the non-light-transmitting area is aligned with the alignment areas of the other two sets of alignment angles. In this way, the alignment region of the first set of alignment angles is aligned. Move the mask so that the light-transmitting area of the mask is aligned with the alignment area of the second set of alignment angles, and the non-light-transmitting area is aligned with the alignment areas of the other two sets of alignment angles, so as to align the alignment area of the second set of alignment angles. of alignment. Move the mask so that the light-transmitting area of the mask is aligned with the alignment area of the third set of alignment angles, and the non-light-transmitting area is aligned with the alignment areas of the other two sets of alignment angles, so as to proceed with the alignment of the third set of alignment angles. of alignment. Such three-domain photo-alignment technology requires moving the mask three times, which means three alignments and three exposures. On the one hand, there are errors in alignment, which may cause two adjacent alignment areas to overlap multiple times or deviate from each other. There are unaligned areas. On the other hand, three exposures will increase the process time (if three exposure times are used, the equipment cost will be increased) and the production capacity will be reduced.

Therefore, the embodiment of the present invention provides a three-domain alignment optical path system, as shown in Figure 1, including:

The light source module 101 is used to provide three groups of three-domain aligned light sources with different incident directions;

Mask module 102. The mask module 102 includes a mask, and the mask includes a light-transmitting area and a non-light-transmitting area;

The loading platform 103 is used to load the substrate 104 to be aligned; the substrate 104 to be aligned includes three groups of alignment areas with different alignment angles; the alignment angle corresponds to the incident direction of the three-domain alignment light source; each light-transmitting area corresponds to the alignment area of the substrate 104 A display pixel, each display pixel includes three alignment areas with different alignment angles; the mask is disposed between the loading platform 103 and the light source module 101, and the light-transmitting area of the mask is located at the projection of the substrate to be aligned 104 Alignment area in the middle of the same display pixel;

Among them, while maintaining the relative position between the mask and the substrate to be aligned 104, the three groups of three-domain alignment light sources provided by the light source module 101 pass through the light-transmitting area of the mask at the same time and are projected to different groups. Other alignment areas;

The incident directions of the three groups of three-domain aligned light sources are respectively at the first incident angle θ ₁ , the second incident angle θ ₂ and the third incident angle θ ₃ , and the first incident angle θ ₁ , the second incident angle θ ₂ and the third incident angle θ 3 Angle θ ₃ is the angle between the incident direction and the normal line of the substrate 104 to be aligned, and θ ₂ =-θ ₁ , θ ₃ =0;

The distance between the mask and the substrate 104 to be aligned on the loading platform 103 is the first distance d;

The alignment widths of the three alignment areas located in the same display pixel are all the first width p, and the gaps between two adjacent alignment areas located in the same display pixel are all the first gap q; where, if they are located in the same display pixel, the alignment widths are all the first width p. If two adjacent alignment areas in a display pixel overlap, then the first gap q<0;

The first incident angle θ ₁ , the second incident angle θ ₂ , the third incident angle θ ₃ , the first distance d, the first width p and the first gap q have the relationship of d=(p+q)×|cotθ ₁ | .

It should be noted that in Figure 1, three groups of arrows in different directions represent three groups of three-domain aligned light sources with different incident directions. The substrate 104 to be aligned is generally a liquid crystal substrate. The substrate 104 to be aligned has multiple display pixels, and each display pixel has three alignment areas with different alignment angles. Three alignment areas with different alignment angles in each display pixel constitute three groups of alignment areas with different alignment angles. The same group of alignment regions is a combination of alignment regions with the same alignment angle.

In addition, the alignment width of each alignment area is equal, and the alignment width is the projected length of the alignment area in the display pixel on the front surface of the substrate 104 to be aligned. The front surface of the alignment substrate is a surface perpendicular to the center line of the middle alignment area of the display pixel. FIG. 2 , FIG. 3 and FIG. 4 are all optical path diagrams of the front surface of the substrate 104 to be aligned. In the same display pixel, the gap between two adjacent alignment regions can be an electrode.

Optionally, in a specific embodiment, when the gap between two adjacent alignment areas in the same display pixel is 0, the optical path during alignment is as shown in Figure 2, and 201 in Figure 2 is a mask. version, 202 is the three alignment areas of the same display pixel. Then the first incident angle θ ₁ , the second incident angle θ ₂ , the first distance d, the first width p and the first gap q have the relationship of d=p×|cotθ ₁ |.

Optionally, in a specific embodiment, when the gap between two adjacent alignment areas in the same display pixel is greater than 0, that is, q>0, the optical path during alignment is as shown in Figure 3. Figure 3 301 in the middle is a mask, and 302 is the three alignment areas of the same display pixel. Then the first incident angle θ ₁ , the second incident angle θ ₂ , the first distance d, the first width p and the first gap q have the relationship of d=(p+q)×|cotθ ₁ |.

Optionally, in a specific embodiment, when the gap between two adjacent alignment areas in the same display pixel is less than 0, that is, when q<0, the optical path during alignment is as shown in Figure 4. Figure 4 401 in the middle is a mask, and 402 is the three alignment areas of the same display pixel. Then the first incident angle θ ₁ , the second incident angle θ ₂ , the first distance d, the first width p and the first gap q have the relationship of d=(p+q)×|cotθ ₁ |.

Optionally, in a specific embodiment, the mask module 102 is controlled to keep the first distance d constant; the light source module 101 is controlled to adjust the first incident angle θ ₁ and the second incident angle θ ₂ so that A group of three domain alignment light sources are projected onto different groups of alignment areas.

It should be noted that by adjusting the first incident angle θ ₁ and the second incident angle θ ₂ , three groups of three-domain alignment light sources are projected to different groups of alignment areas to avoid moving the mask and causing the light-transmitting area to be inconsistent with the same pixel. The middle alignment area is aligned, resulting in poor alignment effect.

Optionally, in a specific embodiment, the light source module 101 is controlled to keep the first incident angle θ ₁ and the second incident angle θ ₂ unchanged; the mask module 102 is controlled to adjust the first distance d so that A group of three domain alignment light sources are projected onto different groups of alignment areas.

It should be noted that the first distance d is adjusted so that three groups of three-domain alignment light sources are projected onto different groups of alignment areas. When loading the substrate 104 to be aligned, the mask can be moved and the first distance d is adjusted at the same time, effectively saving the total alignment time.

It is worth mentioning that embodiments of the present invention can adapt to various substrates and perform corresponding light alignment on various substrates by changing the incident angle or the distance from the mask to the substrate 104 to be aligned.

Optionally, the three alignment areas included in the display pixel are rectangles of equal size, and the alignment area and the light-transmitting area are of the same size.

It should be noted that the alignment area contains a display area. The display area in the alignment area can be an irregular shape smaller than the alignment area, or a rectangle as large as the alignment area. The shape and boundary of the display area will not exceed the alignment. district. Among them, the display area is an area where the three primary colors are displayed through the light filter and used for imaging.

Optionally, in a specific embodiment, as shown in FIG. 5 , the three alignment areas included in the display pixel 501 are rectangles of equal size, and the light-transmitting area 502 is a rectangle with the same size as the alignment area. In Figure 5, the display area and the alignment area are the same size, that is, the entire alignment area is the display area. In FIG. 5 , for simplicity and ease of understanding, the gap between two adjacent alignment regions is not shown, which does not limit the present invention.

Optionally, in a specific embodiment, as shown in FIG. 6 , the three alignment areas included in the display pixel 601 are rectangles of equal size, and the light-transmitting area 602 is a rectangle with the same size as the alignment areas. The display area in Figure 6 is an irregular shape and a rectangle in the alignment area. The size and boundary of the display area do not exceed the alignment area, that is, part of the alignment area is the display area. In FIG. 6 , for simplicity and ease of understanding, the gap between two adjacent alignment regions is not shown, which does not limit the present invention.

Optionally, multiple display pixels form a column of pixel groups, and a column of pixel groups is divided into a left alignment block group, a middle alignment block group and a right alignment block group, and the left alignment block group, the middle alignment block group, the right alignment block group and the transparent The light area is a rectangle of equal width.

Optionally, in a specific embodiment, as shown in Figure 7, multiple display pixels form a column of pixel groups 701. The pixel group 701 contains a left alignment block group, a middle alignment block group and a right alignment block group, and the left, The sizes of the three display areas in the center and right are smaller than the left, center and right alignment blocks. The light-transmitting area 702 is a rectangle with the same width as the three alignment area groups of left, middle and right. There may be a gap in each display pixel in Figure 7, and there may also be a gap between two adjacent alignment block groups. For the convenience of understanding, these are not shown in Figure 7, and the present invention is not limited.

In practical applications, display pixels are mostly arranged as shown in Figure 7. Generally, a light-transmitting area will align a column of display pixels.

It should be noted that in a display pixel, the display area in which the three primary colors can be displayed through the backlight is smaller than or equal to the alignment area. Aligning the entire alignment area can ensure that the entire display area is aligned at the same time.

Optionally, when the light source module 101 aligns the substrate 104 to be aligned, the light source module 101 simultaneously generates three groups of three-domain alignment light sources with different incident directions to align the substrate 104 to be aligned.

It should be noted that the purpose of generating three groups of three-domain alignment light sources at the same time is to perform only one exposure to complete the alignment of the entire substrate 104 to be aligned. This can reduce alignment time and improve alignment efficiency.

Optionally, in a specific embodiment, as shown in Figure 8, the light source module 101 includes: an initial light source lamp 801, a refractor 802 and a reflector 803;

The initial light source emitted by the initial light source lamp 801 is divided into three groups of three-domain light alignment light sources with different incident directions through the refractor 802 and the reflector 803.

It should be noted that the light source module 101 in the present invention can directly use light sources in three different directions, or can use one light source to form light sources in three different directions through refraction and reflection. The purpose of using one light source is to reduce the number of light sources in the light source module 101 The setting of medium light sources simplifies the system structure and avoids the deterioration of the alignment effect caused by errors in the parameters of the light sources due to the use of different light sources.

Optionally, in a specific embodiment, the mask module 102 includes:

The lifting mechanism is used to change the distance between the mask and the substrate 104 to be aligned by transporting the mask.

Optionally, the system also includes: polarizer.

Polarizer, used to convert the three-domain light alignment light source into polarized light. Polarized light is used to adjust the alignment direction of the alignment film.

Optional, the three-domain light alignment light source is a 200-400nm ultraviolet light source.

In the embodiment of the present invention, the mask is disposed between the loading platform 103 and the light source module 101, and the light-transmitting area of the mask is located in the alignment area in the middle of the same display pixel in the projection of the substrate 104 to be aligned. By arranging the light-transmitting area directly above the middle alignment area of the same display pixel, it is ensured that the light-transmitting area can simultaneously align three alignment areas with different alignment angles, thereby improving alignment efficiency. In the embodiment of the present invention, while the relative position between the mask and the substrate to be aligned 104 remains unchanged, three groups of three-domain alignment light sources provided by the light source module 101 pass through the light-transmitting area of the mask at the same time and are projected onto Different groups of alignment zones. It has the following advantages: 1. During the alignment process, the relative position of the mask module 102 and the substrate to be aligned 104 remains unchanged. Compared with the existing technology, there is no need to adjust the mask for alignment, thus avoiding the need for alignment. The bit error causes some positions in the alignment area to be repeatedly aligned by light sources in different directions or some positions in the alignment area are not aligned. Two or three groups of three-domain alignment light sources pass through the light-transmitting area of the mask module 102 at the same time and are projected to different groups of alignment areas. In this way, three groups of alignment areas with different alignment angles can be aligned simultaneously with one exposure, which reduces the number of exposures compared to the existing technology, thereby increasing production efficiency. In summary, the embodiments of the present invention not only solve the alignment problem during the three-domain optical alignment process, ensure the accuracy of alignment, but also improve the alignment efficiency.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations are mutually exclusive. any such actual relationship or sequence exists between them. Furthermore, the terms "comprises," "comprises," or any other variations thereof are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also those not expressly listed other elements, or elements inherent to the process, method, article or equipment. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or apparatus that includes the stated element.

Each embodiment in this specification is described in a related manner. The same and similar parts between the various embodiments can be referred to each other. Each embodiment focuses on its differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple. For relevant details, please refer to the partial description of the method embodiment.

Claims (4)

1. A light alignment optical path system for a liquid crystal display three-domain alignment layer, which is characterized by including: The light source module is used to provide three groups of three-domain aligned light sources with different incident directions; Mask module, the mask module includes a mask, and the mask includes a light-transmitting area and a non-light-transmitting area; A loading platform is used to load the substrate to be aligned; the substrate to be aligned includes three groups of alignment areas with different alignment angles; the alignment angle corresponds to the incident direction of the three-domain alignment light source; The light-transmitting area of each mask corresponds to a display pixel of the substrate to be aligned, and each display pixel includes three alignment areas with different alignment angles; the mask is disposed between the loading platform and the light source module, and the mask The projection of the light-transmitting area on the substrate to be aligned is located in the alignment area in the middle of the same display pixel; among them, while maintaining the relative position of the mask and the substrate to be aligned unchanged, the three sets of three-domain alignment provided by the light source module The light source passes through the light-transmitting area of the mask and is projected to different groups of alignment areas at the same time; The incident directions of the three groups of three-domain aligned light sources are respectively incident at the first incident angle θ ₁ , the second incident angle θ ₂ and the third incident angle θ ₃ . The first incident angle θ ₁ and the second incident angle θ ₂ and the third incident angle θ ₃ is the angle between the incident direction and the normal line of the substrate to be aligned, and θ ₂ =-θ ₁ , θ ₃ =0; The distance between the mask and the substrate to be aligned on the loading platform is the first distance d; The alignment widths of the three alignment areas located in the same display pixel are all the first width p, and the gaps between two adjacent alignment areas located in the same display pixel are all the first gap q; where, if they are located in the same display pixel, the alignment widths are all the first width p. If two adjacent alignment areas in a display pixel overlap, then the first gap q<0; The first incident angle θ ₁ , the second incident angle θ ₂ , the third incident angle θ ₃ , the first distance d, the first width p and the first gap q have d=(p+q)×|cotθ ₁ | Relationship; Control the mask module to keep the first distance d constant; control the light source module to adjust the first incident angle θ ₁ and the second incident angle θ ₂ so that the three groups of three-domain alignment light sources are projected to different groups Other alignment areas; Control the light source module to keep the first incident angle θ ₁ and the second incident angle θ ₂ unchanged; control the mask module to adjust the first distance d so that the three groups of three-domain alignment light sources are projected to different groups Other alignment areas; The three alignment areas included in the display pixel are rectangles of equal size, and the alignment area and the light-transmitting area are of the same size; A plurality of display pixels constitute a column of pixel groups, and the pixel groups in a column are divided into left alignment block group, middle alignment block group and right alignment block group, and the left alignment block group, middle alignment block group, right alignment block group and transparent The light area is a rectangle of equal width. 2. A light alignment optical path system for a liquid crystal display three-domain alignment layer according to claim 1, characterized in that when the light source module aligns the substrate to be aligned, the light source module generates incident light at the same time. Three groups of three-domain alignment light sources with different directions are used to align the substrate to be aligned. 3. A light alignment light path system for a liquid crystal display three-domain alignment layer according to claim 1, characterized in that the light source module includes: an initial light source lamp, a refractor and a reflector; The initial light source emitted by the initial light source lamp is divided into three groups of three-domain light alignment light sources with different incident directions through the refractor and the reflector. 4. A light alignment optical path system for a liquid crystal display three-domain alignment layer according to claim 1, characterized in that the mask module includes: A lifting mechanism, the lifting mechanism is used to change the distance between the mask and the substrate to be aligned by transporting the mask.