CN112904619A - LCD optical alignment method for double-domain alignment - Google Patents
LCD optical alignment method for double-domain alignment Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
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Abstract
The invention provides a double-domain alignment LCD photo-alignment method, which comprises the following steps: step S1: assembling a substrate to be aligned on a loading platform; the substrate to be aligned comprises two groups of alignment regions with different alignment angles, and each display pixel of the substrate to be aligned comprises two alignment regions with different alignment angles; step S2: adjusting a mask plate to enable the center position of a light-transmitting area of the mask plate to be positioned in the middle of two alignment areas in the same display pixel in the projection of a substrate to be aligned; step S3: keeping the relative position of the mask and the substrate to be aligned unchanged, opening the light source module and generating two groups of double-domain alignment light sources with different incidence directions, so that the two groups of double-domain alignment light sources penetrate through the light-transmitting areas of the mask at the same time and project to different groups of alignment areas; the incident direction of the double-domain alignment light source corresponds to the alignment angle, so that the problem of alignment error of a mask plate in the double-domain photo alignment process is solved, exposure times are reduced, and productivity is increased.
Description
Technical Field
The invention belongs to the technical field of optical alignment, and particularly relates to an optical alignment method for a double-domain alignment LCD.
Background
The human body obtains 70% of external information from vision, and with the development of scientific technology, a display becomes an important tool for information transmission and man-machine communication. The most mature Display technology in the contemporary generation, the most popular Thin Film Transistor Liquid Crystal Display (TFT-LCD) with the highest market share. The TFT-LCD operates on the principle that the arrangement of the liquid crystal molecules inside the TFT-LCD changes under the action of an electric field, which is called the electro-optic effect. The change of the liquid crystal molecular structure influences the change of light passing through the liquid crystal molecular structure, then the light and shade change can be shown under the action of the polarizer, and then the gray level and the brightness change of the light can be finally controlled by controlling an electric field by matching with a Color Filter (CF), so that the aim of displaying images is fulfilled. In the TFT-LCD device, in order to improve the response speed, it is necessary to align the liquid crystal molecules at the electrode interface and form a certain pretilt angle, so that the alignment operation of the alignment films on the surfaces of the TFT substrate and the CF substrate is required in the production process. The current alignment technology is divided into rubbing alignment and photo-alignment, wherein the photo-alignment technology mainly uses an alignment material with high ultraviolet light sensitivity and good stability for light alignment. Compared with the rubbing alignment technology, the photo-alignment technology has the advantages of non-contact, no pollution, no static electricity, realization of multi-domain alignment and the like, thereby being widely applied.
The existing double-domain photo-alignment technology adopts contact exposure or proximity exposure, needs two times of alignment and two times of exposure, has errors in alignment on one hand, can cause two alignment regions to overlap for multiple times of alignment or deviate from each other to form an unaligned region, and on the other hand, increases the working procedure time and reduces the productivity by carrying out two times of exposure.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a photo-alignment method for a double-domain alignment LCD (liquid crystal display), aiming at solving the problem of alignment error of a mask plate in the double-domain photo-alignment process, reducing exposure times and increasing productivity.
The invention specifically adopts the following technical scheme:
a photo-alignment method for a double-domain alignment LCD is characterized by comprising the following steps:
step S1: assembling a substrate to be aligned on a loading platform; the substrate to be aligned comprises two groups of alignment regions with different alignment angles, and each display pixel of the substrate to be aligned comprises two alignment regions with different alignment angles;
step S2: adjusting a mask plate to enable the center position of a light-transmitting area of the mask plate to be positioned in the middle of two alignment areas in the same display pixel in the projection of a substrate to be aligned;
step S3: keeping the relative position of the mask and the substrate to be aligned unchanged, opening the light source module and generating two groups of double-domain alignment light sources with different incidence directions, so that the two groups of double-domain alignment light sources penetrate through the light-transmitting areas of the mask at the same time and project to different groups of alignment areas; the incident direction of the double-domain alignment light source corresponds to the alignment angle.
Preferably, in step S3, a distance between the mask and the substrate to be aligned is obtained according to two sets of incident directions of the dual-domain alignment light source, an alignment width of the alignment region, and a gap between two alignment regions in the same display pixel, where d is 0.5 × (p + q) × cot θ1The relationship of | is;
wherein p is the alignment width of the alignment region, q is the gap between two alignment regions in the same display pixel, and θ1Is a first incident angle and has a value of1＝-θ2，θ2At the second angle of incidence is the angle of incidence,first incident angle theta1And a second incident angle theta2The included angle between the incident direction of the two groups of double-domain alignment light sources and the normal line of the substrate to be aligned is formed.
Preferably, the specific implementation method of step S3 is:
controlling the mask plate to keep the distance d between the mask plate and the substrate to be aligned unchanged;
adjusting the first incident angle theta1And a second incident angle theta2And projecting the two groups of double-domain alignment light sources to different groups of alignment areas.
Preferably, the specific implementation method of step S3 is:
controlling the light source module to make the first incident angle theta1And a second incident angle theta2Keeping the same;
and adjusting the distance d between the mask and the substrate to be aligned to enable the two groups of double-domain alignment light sources to project to different groups of alignment areas.
Preferably, the two alignment regions of the display pixel are equally large rectangles; the size of the alignment area is the same as that of the light-transmitting area.
Preferably, a plurality of the display pixels constitute a column of pixel groups; and one row of the pixel components are divided into a left alignment block group and a right alignment block group, and the left alignment block group, the right alignment block group and the light-transmitting zone are rectangles with equal width.
Preferably, when the light source module aligns the substrates to be aligned, the light source module simultaneously generates two sets of double-domain alignment light sources with different incident directions to align the substrates to be aligned.
Preferably, the light source module includes: an initial light source lamp, a half-reflecting and half-transmitting mirror and a reflecting mirror;
the initial light emitted by the initial light source lamp passes through the semi-reflecting semi-transmitting mirror and the reflecting mirror and is divided into two groups of double-domain light alignment light with different incidence directions to be used as double-domain alignment light sources.
Compared with the prior art, the beneficial effects of the invention and the preferred scheme thereof comprise: 1. the mask is arranged between the loading platform and the light source module, and the projection of the light-transmitting area of the mask is positioned between the two alignment areas in the same display pixel at the center of the substrate to be aligned. The light-transmitting area is arranged above the middle of the two alignment areas, so that the light-transmitting area can align the alignment areas with two different alignment angles at the same time, and the alignment efficiency is improved. 2. Under the condition of keeping the relative position of the mask plate module and the substrate to be aligned unchanged, the two groups of double-domain alignment light sources provided by the light source module penetrate through the light-transmitting area of the mask plate module at the same time and project to different groups of alignment areas.
The design has the following advantages: firstly, the relative position of the mask module and the substrate to be aligned is kept unchanged all the time in the alignment process, and the mask is not required to be adjusted for alignment in comparison with the prior art, so that the situation that part of the alignment area is aligned by two groups of light sources in different directions or part of the alignment area is not aligned due to alignment errors is avoided. And the two groups of double-domain alignment light sources penetrate through the light-transmitting areas of the mask module at the same time and project to different groups of alignment areas. Therefore, two groups of alignment regions with different alignment angles can be simultaneously aligned by one-time exposure, and compared with the prior art, the exposure times are reduced, so that the production efficiency is increased. In conclusion, the alignment method and the alignment device not only solve the alignment problem in the double-domain photo-alignment process, ensure the alignment accuracy, but also improve the alignment efficiency.
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The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic flow chart of a photo-alignment method for a dual-domain alignment LCD according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an alignment optical path 1 according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of alignment light paths 2 according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of alignment light paths 3 according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a relationship between an alignment region, a rectangular display region and a light-transmitting region according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a relationship between an alignment region, an irregular-shaped display region and a light-transmitting region according to an embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating a relationship between a pixel group and a transparent region according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a light source forming two sets of light paths in different directions according to an embodiment of the present invention.
Detailed Description
In order to make the features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail as follows:
the invention discloses a double-domain alignment LCD photo-alignment method, which can be realized by appropriately improving technical details by taking the contents of the text as reference by a person skilled in the art. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
In order to make the liquid crystal image better in the production process of the liquid crystal display, the liquid crystal needs to be aligned. The optical alignment technology has the advantages of non-contact, no pollution and no electrostatic lamp, and is widely applied to alignment operation of liquid crystal display screens. In the existing commonly used dual-domain photo-alignment technology, a light-transmitting area of a mask is aligned to an alignment area with the same alignment angle, and an alignment area with the other alignment angle is shielded by a non-light-transmitting area of the mask to perform first alignment; and then moving the mask plate to align the light-transmitting area of the mask plate with the alignment area of the other alignment angle for second alignment. Such a double-domain photo-alignment technique requires two alignments and two exposures, and on one hand, there is an error in the alignment, which may cause two alignment regions to overlap or deviate from each other and an unaligned region exists, and on the other hand, the two exposures increase the process time (if two exposures are used, the equipment cost input is increased), thereby reducing the throughput.
Therefore, an embodiment of the present invention provides a photo-alignment method for a dual-domain alignment LCD, as shown in fig. 1, the method includes:
step S101: the substrate to be aligned is loaded on the loading platform.
The substrate to be aligned comprises two groups of alignment regions with different alignment angles, and each display pixel of the substrate to be aligned comprises two alignment regions with different alignment angles.
It should be noted that the loading platform is used for fixing and loading the substrate to be aligned. The substrate to be aligned is typically a liquid crystal substrate. The substrate to be aligned has a plurality of display pixels, and each display pixel has two alignment regions with different alignment angles. The alignment regions with two different alignment angles in each display pixel form two sets of alignment regions with different alignment angles. The alignment regions of the same group are combinations of alignment regions having the same alignment angle.
Step S102: and adjusting the mask plate to enable the center position of the light-transmitting area of the mask plate to be positioned in the middle of the two alignment areas in the same display pixel in the projection of the substrate to be aligned.
The mask includes a light-transmitting region and a non-light-transmitting region. The light-transmitting area is used for transmitting the double-domain alignment light source to perform alignment on the alignment area in the display pixel, and the non-light-transmitting area shields the double-domain alignment light source, so that the alignment area is prevented from being aligned for multiple times by the light sources in different directions. The purpose of enabling the projection of the central position of the light-transmitting area of the mask plate on the substrate to be aligned to be positioned between the two alignment areas in the same display pixel is to enable the double-domain alignment light source to simultaneously align the alignment areas with two different alignment angles. The light-transmissive region generally corresponds to a display pixel, or a group of display pixels. A group of display pixels is arranged with the middle position of the pixel as the alignment axis, as shown in fig. 7.
Step S103: and keeping the relative position of the mask and the substrate to be aligned unchanged, opening the light source module and generating two groups of double-domain alignment light sources with different incidence directions, so that the two groups of double-domain alignment light sources penetrate through the light transmitting area of the mask at the same time and project to different groups of alignment areas.
The incident direction of the double-domain alignment light source corresponds to the alignment angle.
It should be noted that, by maintaining the relative position between the mask and the substrate to be aligned unchanged, the problem of multiple alignment or non-alignment of partial regions of the alignment region due to alignment error in the alignment process can be solved. Two groups of double-domain alignment light sources penetrate through the light transmitting area of the mask at the same time and project to different groups of alignment areas, and all alignment can be completed through one-time exposure, so that the alignment time is shortened, the alignment efficiency is improved, and the productivity is improved.
Optionally, as shown in fig. 8, the light source module 801 provided in this embodiment generates two sets of double-domain alignment light sources with different incident directions, including:
a light source module 801, which makes the light source module generate an initial light source;
the primary light source is divided into two groups of two-domain light-aligned light sources having different incident directions using the half mirror 802 and the mirror 803.
Optionally, one light source is divided into two light sources by the half-reflecting and half-transmitting mirror, and the two light sources in the two directions are reflected to the alignment region by the two reflecting mirrors.
It should be noted that, in the present invention, the light source module 801 may directly adopt two light sources in different directions, or may adopt one light source to form two light sources in different directions through transmission and reflection, and the purpose of adopting one light source is to reduce the number of light sources in the light source module 801, simplify the system structure, and avoid the alignment effect from being deteriorated due to the error in the parameters of the light sources caused by adopting different light sources.
Optionally, the method further includes:
obtaining the distance between a mask and a substrate to be aligned according to two groups of incidence directions of the double-domain alignment light source, the alignment width of the alignment region and the gap between the two alignment regions in the same display pixel, wherein the distance d between the mask and the substrate to be aligned meets the condition that d is 0.5 x (p + q) x co t theta1The relationship of | is;
wherein p is the alignment width of the alignment region, q is the gap between two alignment regions in the same display pixel, and θ1Is a first incident angle and has a value of1＝-θ2，θ2At the second incident angle, the first incident angle theta1And a second incident angle theta2The included angle between the incident direction of the two groups of double-domain alignment light sources and the normal line of the substrate to be aligned is formed.
To be explainedThe alignment width of each alignment region is equal, and the alignment width is the projection length of the alignment region in the display pixel on the front view plane of the substrate to be aligned. The front view plane of the alignment substrate is a plane perpendicular to the center lines of the two alignment regions in the display pixel. Fig. 2, 3 and 4 are optical path diagrams of the front view surface of the substrate to be aligned. The embodiment of the invention is based on d being 0.5 (p + q) x cot theta1The | relationship can enable two groups of double-domain alignment light sources in different directions to accurately align the alignment areas corresponding to the two groups of double-domain alignment light sources, and ensure that no alignment is leaked and no reconfiguration is carried out. In the same display pixel, the gap between the two alignment regions may be an electrode.
Optionally, in a specific embodiment, when the gap between two alignment regions in the same display pixel is 0, the optical path during alignment is as shown in fig. 2, where 201 in fig. 2 is a mask and 202 is two alignment regions of the same display pixel. The first incident angle theta1A second incident angle theta2The distance d between the mask and the substrate to be aligned, the width p of the alignment region and the gap q between two alignment regions in the same display pixel are 0.5 XpXco t theta1The relationship of | is given.
Optionally, in a specific embodiment, when a gap between two alignment regions in the same display pixel is greater than 0, that is, q > 0, an optical path during alignment is as shown in fig. 3, where 301 in fig. 3 is a mask and 302 is two alignment regions of the same display pixel. The first incident angle theta1A second incident angle theta2The distance d between the mask and the substrate to be aligned, the width p of the alignment region and the gap q between the two alignment regions in the same display pixel are equal to 0.5 × (p + q) × | cot theta1The relationship of | is given.
Optionally, in a specific embodiment, when a gap between two alignment regions in the same display pixel is smaller than 0, that is, q is smaller than 0, it is described that the two alignment regions are overlapped, and an optical path during alignment is as shown in fig. 4, where 401 in fig. 4 is a mask and 402 is two alignment regions of the same display pixel. The first incident angle theta1A second incident angle theta2The distance d between the mask and the substrate to be aligned, the width p of the alignment region and the gap between two alignment regions in the same display pixelq has d 0.5 × (p + q) × | cotθ1The relationship of | is given.
Optionally, the method further includes:
controlling the mask plate to keep the distance d between the mask plate and the substrate to be aligned unchanged;
adjusting the first incident angle theta1And a second incident angle theta2And projecting the two groups of double-domain alignment light sources to different groups of alignment areas.
It should be noted that the first incident angle θ is adjusted1And a second incident angle theta2And then two groups of double-domain alignment light sources project to different groups of alignment areas, and the problem that the alignment effect is poor due to the fact that the light-transmitting area cannot be aligned with the middle of two alignment areas in the same display pixel due to the fact that the mask module is moved is avoided.
Optionally, the method further includes:
controlling the light source module to make the first incident angle theta1And a second incident angle theta2Keeping the same;
and adjusting the distance d between the mask and the substrate to be aligned to enable the two groups of double-domain alignment light sources to project to different groups of alignment areas.
It should be noted that, when the substrate to be aligned is loaded, the mask is moved and the distance d between the mask and the substrate to be aligned is adjusted to project the two groups of bi-domain alignment light sources to different groups of alignment regions, thereby effectively saving the total alignment time.
It should be noted that the embodiments of the present invention can adapt to various substrates and perform corresponding photo-alignment on various substrates by changing the incident angle or the distance from the mask to the substrate to be aligned.
Optionally, the two alignment regions included in the display pixel are rectangles with equal size, and the size of the alignment region is the same as that of the light-transmitting region.
It should be noted that the display region in the alignment region may be irregular shape smaller than the alignment region, or may be rectangular shape as large as the alignment region, and the shape and the boundary of the display region do not exceed the alignment region. The display area is an area for displaying three primary colors through the optical filter and is used for imaging.
Alternatively, in a specific embodiment, as shown in fig. 5, the display pixel 501 includes two alignment regions having equal size and the light-transmitting region 502 has the same size as the alignment regions. In FIG. 5, the display area is the same size as the alignment area, i.e., the entire alignment area is the display area. Fig. 5 is a schematic view showing a gap between two alignment regions for simplicity and convenience of understanding, and does not limit the present invention.
Alternatively, in a specific embodiment, as shown in fig. 6, the display pixel 601 includes two alignment regions having equal size and the light-transmitting region 602 has the same size as the alignment regions. In fig. 6, the display area is irregular in shape in the alignment region, and the size and the boundary of the display area do not exceed the alignment region, i.e., a part of the display area in the alignment region is the display area. Fig. 6 shows a gap between two alignment regions for simplicity and ease of understanding, and does not limit the present invention.
Optionally, the plurality of display pixels form a row of pixel groups, the row of pixel groups is divided into a left alignment group and a right alignment group, and the left alignment group, the right alignment group and the light-transmitting region are rectangles with equal width.
Optionally, in a specific embodiment, as shown in fig. 7, a plurality of display pixels form a row of pixel group 701, the pixel group 701 includes a left alignment group and a right alignment group, and the sizes of the left and right display regions are smaller than those of the left and right alignment groups. The light-transmitting region 702 is a rectangle having the same width as the left and right alignment block groups. Gaps may exist in each display pixel in fig. 7, and gaps may also exist between two alignment region groups, which are not shown in fig. 7 for convenience of understanding, and the present invention is not limited thereto.
In practical applications, the display pixels are mostly arranged as shown in fig. 7, and one transparent region is generally used to align a row of display pixels.
It should be noted that, in the display pixel, the display area that can display three primary colors through the backlight is smaller than or equal to the alignment area. The whole alignment region is aligned to ensure that the whole display region is aligned simultaneously.
Optionally, when the light source module aligns the substrate to be aligned, the method further includes:
and opening the light source module to enable the light source module to simultaneously generate two groups of double-domain alignment light sources with different incidence directions so as to align the substrates to be aligned.
It should be noted that the purpose of generating the dual-domain alignment light source is to perform the alignment of the whole substrate to be aligned only once. Therefore, the alignment time can be reduced, and the alignment efficiency can be improved.
Optionally, in a specific embodiment, the method further includes:
and (3) conveying the mask plate by adopting a lifting mechanism, and changing the distance between the mask plate and the substrate to be aligned.
Optionally, in a specific embodiment, the method further includes:
the double-domain light alignment light source is converted into polarized light by adopting a polaroid. The polarized light is used to adjust the alignment direction of the alignment film.
Optionally, the double-domain light-alignment light source is an ultraviolet light source with 200 and 400 nm.
In the embodiment of the invention, the mask is adjusted so that the center position of the light-transmitting area of the mask is positioned between the two alignment areas in the same display pixel in the projection of the substrate to be aligned. The light-transmitting area is arranged above the middle of the two alignment areas, so that the light-transmitting area can align the alignment areas with two different alignment angles at the same time, and the alignment efficiency is improved. The embodiment of the invention keeps the relative position of the mask and the substrate to be aligned unchanged, opens the light source module and generates two groups of double-domain alignment light sources with different incidence directions, so that the two groups of double-domain alignment light sources penetrate through the light-transmitting area of the mask at the same time and project to different groups of alignment areas. Has the following advantages: firstly, the relative position of the mask module and the substrate to be aligned is kept unchanged all the time in the alignment process, and the mask is not required to be adjusted for alignment in comparison with the prior art, so that the situation that part of the alignment area is aligned by two groups of light sources in different directions or part of the alignment area is not aligned due to alignment errors is avoided. And the two groups of double-domain alignment light sources penetrate through the light-transmitting areas of the mask module at the same time and project to different groups of alignment areas. Therefore, two groups of alignment regions with different alignment angles can be simultaneously aligned by one-time exposure, and compared with the prior art, the exposure times are reduced, so that the production efficiency is increased. In summary, the embodiment of the invention not only solves the alignment problem in the double-domain photo-alignment process, ensures the alignment accuracy, but also improves the alignment efficiency.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The present invention is not limited to the above preferred embodiments, and all other various methods for photo-alignment of the LCD with the bi-domain alignment can be obtained by anyone who can use the present invention.
Claims (8)
1. A photo-alignment method for a double-domain alignment LCD is characterized by comprising the following steps:
step S1: assembling a substrate to be aligned on a loading platform; the substrate to be aligned comprises two groups of alignment regions with different alignment angles, and each display pixel of the substrate to be aligned comprises two alignment regions with different alignment angles;
step S2: adjusting a mask plate to enable the center position of a light-transmitting area of the mask plate to be positioned in the middle of two alignment areas in the same display pixel in the projection of a substrate to be aligned;
step S3: keeping the relative position of the mask and the substrate to be aligned unchanged, opening the light source module and generating two groups of double-domain alignment light sources with different incidence directions, so that the two groups of double-domain alignment light sources penetrate through the light-transmitting areas of the mask at the same time and project to different groups of alignment areas; the incident direction of the double-domain alignment light source corresponds to the alignment angle.
2. The photo-alignment method for the dual-domain alignment LCD according to claim 1, wherein:
in step S3, a distance between the mask and the substrate to be aligned is obtained according to two groups of incident directions of the dual-domain alignment light source, the alignment width of the alignment region, and a gap between two alignment regions in the same display pixel, where d is 0.5 × (p + q) × | cot θ1The relationship of | is;
wherein p is the alignment width of the alignment region, q is the gap between two alignment regions in the same display pixel, and θ1Is a first incident angle and has a value of1＝-θ2，θ2At the second incident angle, the first incident angle theta1And a second incident angle theta2The included angle between the incident direction of the two groups of double-domain alignment light sources and the normal line of the substrate to be aligned is formed.
3. The photo-alignment method for the dual-domain alignment LCD according to claim 2, wherein the step S3 is implemented by the following steps:
controlling the mask plate to keep the distance d between the mask plate and the substrate to be aligned unchanged;
adjusting the first incident angle theta1And a second incident angle theta2And projecting the two groups of double-domain alignment light sources to different groups of alignment areas.
4. The photo-alignment method for the dual-domain alignment LCD according to claim 2, wherein the step S3 is implemented by the following steps:
controlling the light source module to make the first incident angle theta1And a second incident angle theta2Keeping the same;
and adjusting the distance d between the mask and the substrate to be aligned to enable the two groups of double-domain alignment light sources to project to different groups of alignment areas.
5. The photo-alignment method for the dual-domain alignment LCD according to claim 1, wherein: the two alignment regions of the display pixels are rectangles with equal size; the size of the alignment area is the same as that of the light-transmitting area.
6. The photo-alignment method for the dual-domain alignment LCD according to claim 1, wherein: a plurality of display pixels form a column of pixel groups; and one row of the pixel components are divided into a left alignment block group and a right alignment block group, and the left alignment block group, the right alignment block group and the light-transmitting zone are rectangles with equal width.
7. The photo-alignment method for the dual-domain alignment LCD according to claim 1, wherein: when the light source module is used for carrying out alignment on the substrate to be aligned, the light source module simultaneously generates two groups of double-domain alignment light sources with different incidence directions so as to carry out alignment on the substrate to be aligned.
8. The photo-alignment method for the dual-domain alignment LCD according to claim 1, wherein:
the light source module includes: an initial light source lamp, a half-reflecting and half-transmitting mirror and a reflecting mirror;
the initial light emitted by the initial light source lamp passes through the semi-reflecting semi-transmitting mirror and the reflecting mirror and is divided into two groups of double-domain light alignment light with different incidence directions to be used as double-domain alignment light sources.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115113442A (en) * | 2022-04-26 | 2022-09-27 | 成都中电熊猫显示科技有限公司 | Display panel and display device |
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| US6479218B1 (en) * | 1999-10-14 | 2002-11-12 | Lg Philips Lcd Co., Ltd | Method for manufacturing multi-domain liquid crystal cell |
| CN107561786A (en) * | 2017-07-31 | 2018-01-09 | 信利（惠州）智能显示有限公司 | A kind of multidomain light alignment method and light path system |
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| US6479218B1 (en) * | 1999-10-14 | 2002-11-12 | Lg Philips Lcd Co., Ltd | Method for manufacturing multi-domain liquid crystal cell |
| CN107561786A (en) * | 2017-07-31 | 2018-01-09 | 信利（惠州）智能显示有限公司 | A kind of multidomain light alignment method and light path system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115113442A (en) * | 2022-04-26 | 2022-09-27 | 成都中电熊猫显示科技有限公司 | Display panel and display device |
| CN115113442B (en) * | 2022-04-26 | 2024-04-26 | 成都京东方显示科技有限公司 | Display panel and display device |
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