CN109459891B - Light alignment method of display panel, display panel and display device - Google Patents
Light alignment method of display panel, display panel and display device Download PDFInfo
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- CN109459891B CN109459891B CN201811633869.4A CN201811633869A CN109459891B CN 109459891 B CN109459891 B CN 109459891B CN 201811633869 A CN201811633869 A CN 201811633869A CN 109459891 B CN109459891 B CN 109459891B
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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
Abstract
The invention provides a light alignment method of a display panel, the display panel and a display device, wherein the light alignment method of the display panel comprises the following steps: dividing each first sub-pixel area into two first exposure areas arranged along a first arrangement direction, and respectively carrying out alignment on the first exposure areas along a second arrangement direction, wherein the alignment directions of different first exposure areas are opposite, the first arrangement direction and the second arrangement direction are both located in a plane where the first substrate is located, and the first arrangement direction and the second arrangement direction are vertical; and dividing each second sub-pixel area into at least two second exposure areas arranged along a second arrangement direction, and respectively aligning the second exposure areas along the first arrangement direction, wherein the second exposure areas with the same alignment direction have different exposure and/or alignment light irradiation angles during alignment. The invention realizes the eight-domain structure only by improving the alignment process, and has simpler realization and lower cost.
Description
Technical Field
The invention relates to the technical field of display, in particular to a light alignment method of a display panel, the display panel and a display device.
Background
UV2The a (Ultra Violet Vertical Alignment) technology is a VA (Vertical Alignment) panel technology that performs liquid crystal Alignment using UltraViolet (UV) light, and the name of the technology comes from multiplication of UltraViolet UV light and a VA mode of a liquid crystal panel, and the principle is that precise Alignment control of liquid crystal molecules is realized by using UV light, and the UV light is used for realizing the UV Alignment control2The a technique can realize a state in which all liquid crystal molecules are tilted in a design direction by the alignment film, so that the liquid crystal molecules can be simultaneously tilted in the same direction when an electric field is applied, the response speed is increased by 2 times, and since it can be divided into a plurality of regions without using protrusions and slits,therefore, the aperture ratio is remarkably improved as compared with the conventional method in which a plurality of domains are formed by protrusions, and thus, the method is widely used. However, in a Vertical Alignment (VA) product, since vertical rotation liquid crystal is used, the difference of birefringence of liquid crystal molecules is large, which results in color shift phenomenon under different viewing angles.
Currently, a multi-domain structure is a common method for solving the color shift problem. As shown in fig. 1, one sub-pixel region is divided into an upper pixel region including 4 domains at the upper side and a lower pixel region including 4 domains at the lower side. The current 8-domain design is based on the electrical principle, so that the rotation angles of the liquid crystal molecules in the upper pixel region and the lower pixel region in the same sub-pixel are different, and 8 different liquid crystal orientations are realized, so as to realize 8-domain display. Specifically, the driving voltage V1 applied to the upper pixel region and the driving voltage V2 applied to the lower pixel region are different, so that the upper pixel region and the lower pixel region reach different charging saturation states after being charged, and further, the deflection degrees of the liquid crystal are inconsistent, and thus the upper pixel region and the lower pixel region can compensate each other under an oblique viewing angle to achieve the purpose of improving color cast. In the above-described scheme, as a scheme for electrically realizing eight domains, it is necessary to design different TFT switches or to provide different Data/Gata wirings in the upper pixel region and the lower pixel region, so as to achieve the purpose of different driving voltages in the upper pixel region and the lower pixel region.
However, in the above scheme of electrically implementing multi-domains, the TFT switches or the Data/Gata wirings provided differently are designed to be complicated, and thus, the implementation is complicated and the cost is high.
Disclosure of Invention
The invention provides a light alignment method of a display panel, the display panel and a display device, which can realize a multi-domain structure of a liquid crystal display panel by a simple process and have lower cost.
An aspect of the present invention provides a photo-alignment method for a display panel, the display panel including a first substrate and a second substrate arranged opposite to the first substrate, a liquid crystal layer being disposed between the first substrate and the second substrate, the first substrate including a plurality of first sub-pixel regions arranged in an array, the second substrate including a plurality of second sub-pixel regions corresponding to the plurality of first sub-pixel regions, each of the first sub-pixel regions coinciding with its corresponding second sub-pixel region when the first substrate and the second substrate are opposite to each other, the method comprising: dividing each first sub-pixel area into two first exposure areas arranged along a first arrangement direction, and respectively carrying out alignment on the first exposure areas along a second arrangement direction, wherein the alignment directions of different first exposure areas are opposite, the first arrangement direction and the second arrangement direction are both located in a plane where the first substrate is located, and the first arrangement direction and the second arrangement direction are vertical; and dividing each second sub-pixel area into at least two second exposure areas arranged along a second arrangement direction, and respectively aligning the second exposure areas along the first arrangement direction, wherein the second exposure areas with the same alignment direction have different exposure and/or alignment light irradiation angles during alignment.
Another aspect of the present invention provides a display panel manufactured by the photo-alignment method.
The invention further provides a display device comprising the display panel.
In the photo-alignment method of the display panel, the display panel and the display device, the photo-alignment method of the display panel only depends on the improvement of the alignment process to realize the eight-domain structure of the sub-pixel region. Compared with the scheme of realizing multi-domain by an electrical method in the prior art, the method has the advantages of simple realization and low cost because no additional TFT switch or different Data/Gata wiring design is needed. Meanwhile, the reliability of the finished product is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art structure for electrically implementing an eight-domain display;
FIG. 2 is a flowchart illustrating a photo-alignment method for a display panel according to an embodiment of the present invention;
fig. 3a to 3b are schematic diagrams illustrating a photo-alignment method of a display panel according to an embodiment of the invention;
FIG. 4 is a schematic structural diagram of a display panel after aligning a box in a photo-alignment method for a display panel according to an embodiment of the present invention;
fig. 5a to 5g are schematic diagrams illustrating an implementation process of a photo-alignment method for a display panel according to an embodiment of the present invention.
Description of reference numerals:
1 — a first subpixel area;
2-a second sub-pixel region;
11 — first exposure region;
21-second exposure area.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The first aspect of the present invention provides a photoalignment method for a display panel, which is applicable to the preparation of a multi-domain display panel with a VA mode display mode, and is particularly applicable to the use of UV2A photoalignment technique.
The display panel comprises a first substrate and a second substrate, wherein the second substrate is arranged opposite to the first substrate in a box-to-box mode, a liquid crystal layer is arranged between the first substrate and the second substrate, the first substrate comprises a plurality of first sub-pixel regions which are arranged in an array mode, the second substrate comprises a plurality of second sub-pixel regions corresponding to the first sub-pixel regions, and when the first substrate and the second substrate are opposite to the box, each first sub-pixel region is overlapped with the corresponding second sub-pixel region. The display panel may be a liquid crystal display panel, and generally, the liquid crystal display panel includes an array substrate, a counter substrate, and a liquid crystal layer filled between the array substrate and the counter substrate. Specifically, the array substrate side comprises criss-cross scanning lines and data lines and a plurality of sub-pixel units defined by the intersection of the scanning lines and the data lines, and the opposite substrate is provided with a plurality of sub-pixel units corresponding to the sub-pixel units on the array substrate. Photo-alignment of the display panel refers to a method of controlling the rotation of liquid crystal molecules by irradiating linearly polarized alignment light (hereinafter, referred to as alignment light) onto the photosensitive high molecular polymer alignment films on the array substrate and the opposite substrate to form a pretilt angle in the liquid crystal layer.
Therefore, when the first substrate is an array substrate and the second substrate is an opposite substrate, the first sub-pixel region arranged in the array refers to a plurality of sub-pixel units defined by the intersections of the scanning lines and the data lines on the array substrate, and the second sub-pixel region refers to a plurality of sub-pixel units arranged on the opposite substrate corresponding to the plurality of sub-pixel units on the array substrate. Similarly, when the first substrate is an opposite substrate and the second substrate is an array substrate, the second sub-pixel regions arranged in an array refer to a plurality of sub-pixel units defined by the intersection of the scanning lines and the data lines on the array substrate, and the first sub-pixel regions refer to sub-pixel units on the opposite substrate and arranged corresponding to the plurality of sub-pixel units on the array substrate. As is apparent from the above description, when the first substrate and the second substrate are aligned, each of the first sub-pixel regions overlaps with the corresponding second sub-pixel region.
In addition, in the present application, the array direction of the array arrangement of the plurality of sub-pixel units on the array substrate is the same as the array direction of the first sub-pixel region or the array direction of the second sub-pixel region. Here, a row direction of the arrangement direction of the first subpixel region may be defined as a first arrangement direction, and a column direction of the arrangement direction of the first subpixel region may be defined as a second arrangement direction. Alternatively, the column direction of the arrangement direction of the first subpixel regions may be defined as a first arrangement direction, and the row direction of the arrangement direction of the first subpixel regions may be defined as a second arrangement direction. For convenience of explanation, in the drawings of the present application, the column direction of the arrangement direction of the first subpixel regions is denoted by a letter "C", and the row direction of the arrangement direction of the first subpixel regions is denoted by a letter "R".
FIG. 2 is a flowchart illustrating a photo-alignment method for a display panel according to an embodiment of the present invention; fig. 3a to 3b are schematic diagrams illustrating a photo-alignment method of a display panel according to an embodiment of the invention. As shown in fig. 2, the optical alignment method of the display panel of the present embodiment includes:
s1, dividing each first sub-pixel area on the first substrate into two first exposure areas arranged along a first arrangement direction, and respectively aligning each first exposure area along a second arrangement direction, wherein the alignment directions of different first exposure areas are opposite;
and S2, dividing each second sub-pixel region on the second substrate into at least two second exposure regions arranged along the second arrangement direction, and respectively aligning the second exposure regions along the first arrangement direction, wherein the second exposure regions with the same alignment direction have different exposure and/or alignment light irradiation angles during alignment.
In the above-described steps, the row direction of the arrangement direction of the first subpixel regions is defined as a first arrangement direction, and the column direction of the arrangement direction of the first subpixel regions is defined as a second arrangement direction. And the traveling direction of the substrate and the alignment direction are parallel.
In the drawings of the present application, for the arrow used to indicate the alignment direction, the direction of the arrow represents the direction of photoalignment, and the length of the arrow represents the magnitude of the exposure amount and/or the alignment light irradiation angle, i.e., the longer the length of the arrow, the larger the exposure amount and/or the alignment light irradiation angle, the smaller the length of the arrow, and the smaller the exposure amount and/or the alignment light irradiation angle. Meanwhile, for convenience of explanation, one of the row directions, for example, the left side on the paper surface, is defined as being leftward in the row direction, and the other of the row directions, for example, the right side on the paper surface, is defined as being rightward in the row direction; one of the column directions, for example, the upper side on the paper surface, is defined as upward in the column direction, and the other of the column directions, for example, the lower side on the paper surface, is defined as downward in the column direction. However, this is merely an example, and the present invention is not limited thereto.
Specifically, in fig. 3a, the first sub-pixel region 1 is divided into two first exposure regions 11 arranged along the row direction, for example, the first exposure regions 11 located on the left side of the row direction are first aligned along the column direction; the first exposure regions 11 located on the right side in the row direction are then aligned in the column direction. And the alignment directions of the two exposure regions are opposite. In fig. 3a, the alignment direction of the first exposure regions 11 on the left side is taken as the column direction upward, and the alignment direction of the first exposure regions 11 on the right side is taken as the column direction downward for the example of explanation. Of course, other options are possible as long as the alignment direction of the two exposure regions is ensured to be opposite.
Then, in fig. 3b, the second sub-pixel region 2 is divided into at least two second exposure regions 21 arranged in the column direction, for example, four second exposure regions 21, and the second exposure regions 21 located in the first row, the second row, the third row, and the fourth row are aligned, respectively. Wherein, each second exposure region 21 with the same alignment direction has different exposure and/or alignment light irradiation angle when aligning. In fig. 3b, the alignment directions of the second exposure regions 21 in the first, second, third, and fourth rows are taken as the left and right directions, respectively, as an example. Of course, other options are possible. In fig. 3b, the alignment directions of the second exposure regions 21 in the first and third rows are the same, and the alignment directions of the second exposure regions 21 in the second and fourth rows are the same, so that the second exposure regions 21 in the first row and the second exposure regions 21 in the third row have different exposure amounts and/or alignment light irradiation angles when aligned; the second exposure regions 21 located in the second row and the second exposure regions 21 located in the fourth row have different exposure amounts and/or alignment light irradiation angles when aligned. In addition, the exposure amount and/or the alignment light irradiation angle of the second exposure regions 21 with different alignment directions, for example, the second exposure regions 21 located in the first row and the second row, may be the same or different. In fig. 3b, the exposure amount and/or the alignment light irradiation angle of the second exposure regions 21 with different alignment directions are/is the same, but the invention is not limited thereto.
In addition, when the second exposure regions 21 with the same alignment direction are aligned, what is actually affected by the different exposure and/or alignment light irradiation angles is the liquid crystal pretilt angle of the liquid crystal layer corresponding to the second exposure regions 21. Specifically, when the exposure amount and/or the alignment light irradiation angle are different when the different second exposure regions 21 are aligned, the alignment microstructures formed on the photosensitive high molecular polymer alignment films in the different second exposure regions 21 are different and reflected in the liquid crystal regions corresponding to the alignment microstructures, so that the pretilt angles of the liquid crystals in the liquid crystal regions corresponding to the alignment microstructures are different.
Further, alternatively, the exposure amount and the alignment light irradiation angle of all the first exposure regions 11 are the same. This can simplify the alignment process.
The step of performing the pair-cassette process for the first substrate and the second substrate is further included after the above step S2.
Fig. 4 is a schematic structural diagram of the display panel after aligning the box in the optical alignment method of the display panel according to the first embodiment of the present invention. As shown in fig. 4, since the first sub-pixel region on the first substrate is divided into two regions for alignment, and the second sub-pixel region on the second substrate is divided into four regions for alignment, eight regions are physically formed in the range of one first sub-pixel region (second sub-pixel region) after the first substrate and the second substrate are aligned, and the eight regions are represented by letters "a", "B", "E", "F", "G", "H", "I" and "J", respectively. In each small region, the domain vector direction of each region is also shown by the solid bold arrows. Specifically, in the a region, since the light alignment direction is upward in the column direction at the corresponding region on the first substrate and the light alignment direction is leftward in the row direction at the corresponding region on the second substrate, the resultant domain vector is directed upward to the left. For the G region, since the photoalignment direction is upward in the column direction at the corresponding region on the first substrate, and the photoalignment direction is leftward in the row direction at the corresponding region on the second substrate, the resultant vector is directed upward and leftward. For the remaining six other regions, the direction of the domain vector is also correspondingly marked.
As shown in regions a, B, E, and F in the figure, the first substrate is aligned in the column direction upward and downward, and the second substrate is aligned in the row direction leftward and rightward, respectively, so that four possible domain vector orientations, i.e., upward left, downward left, upward right, and downward right, are generated in the sub-pixel unit after the cell. In other words, if a combination of four alignment directions is simply relied on, only four domains can actually be generated in the first sub-pixel region. Therefore, if the pretilt angle of the liquid crystal corresponding to the corresponding region is not changed, although the sub-pixel unit is physically divided into eight regions, the domains synthesized by the regions having the same alignment direction have the same direction of the domain vector, but actually belong to the same domain, and thus the purpose of eight domains is not achieved. The different domains defined in the present invention mean that the pretilt angles of the liquid crystals or the orientations of the domain vectors corresponding to the regions are different, that is, the directions of the domain vectors (the directions of black solid arrows) are different.
Specifically, when comparing the a region and the G region, assuming that the exposure amount and/or the alignment light irradiation angle when aligning the second exposure region 21 in the first row and the second exposure region 21 in the third row of the second substrate are the same, and the lengths of arrows in the row direction toward the left are the same when reflecting the exposure amount and/or the alignment light irradiation angle to the a region and the G region, the directions of the synthesized domain vectors are both the upper left, and the included angles between the two domain vectors and the row direction are the same, so that the a region and the G region belong to the same domain substantially because the directions of the domain vectors are the same. In order to avoid this, in the present embodiment, the second exposure regions having the same alignment direction are made to have different exposure amounts and/or alignment light irradiation angles at the time of alignment. Specifically, in the a region and the G region, the lengths of arrows in the row direction toward the left are different, and thus the synthesized domain vectors both face the upper left, but the included angles between the two domain vectors and the row direction are different, that is, the directions of the domain vectors are different, so that the a region and the G region belong to different domains substantially due to the fact that the directions of the domain vectors are different. Similarly, the B area and the H area, the E area and the I area, and the F area and the J area belong to different domains, so that the eight-domain structure of the sub-pixel area can be realized only by changing the alignment process. In other words, in the embodiment, the two alignment directions of the first substrate and the two alignment directions of the second substrate are combined to form four physical domain vector orientations, and then the regions with the same domain vector orientation are matched with different pretilt angles of the liquid crystal, so that a substantial multi-domain structure is formed. Compared with the scheme of realizing multi-domain by an electrical method in the prior art, the method has the advantages of simple realization and low cost because no additional TFT switch or different Data/Gata wiring design is needed. Meanwhile, the reliability of the finished product is greatly improved.
In addition, in the above description, the eight-domain structure is taken as an example for illustration, but for other numbers of domains, such as 16 domains, the forming method is similar, and thus the description is omitted here. Other kinds of variations in alignment direction, different exposure amounts during alignment, and/or variations in the angle of illumination of alignment light for each second exposure region 21 in the second sub-pixel region 2 are not expanded in detail since the derivation process of the domain vector direction is similar to that described above.
In addition, in the above-mentioned scheme, the alignment directions of two adjacent second exposure regions 21 may be opposite, so that the distribution of the domain vector orientations may be more uniform, specifically, if the alignment directions of the second exposure regions 21 located in the first row, the second row and the third row are all leftward along the row direction in the alignment process of the second sub-pixel region, the synthesized domain vectors in the a region, the E region and the G region all face upward left, and although the pretilt angles of the liquid crystals corresponding to them are different, so that the a region, the E region and the G region belong to different domains, the display effect is slightly inferior to that in the case that the a region faces upward left, the E region faces upward right and the G region faces upward left in fig. 4. This is because if the alignment directions of the adjacent two second exposure regions 21 are opposite, the domain vector orientations of the adjacent domains are not the same, and the display effect is more uniform.
In addition, optionally, the number of the second exposure regions 21 with opposite alignment directions in the at least two second exposure regions 21 is the same. By this arrangement, the distribution of the orientation of the domain vectors can be made more uniform. If the number of the second exposure regions 21 with opposite alignment directions is different, the alignment directions of the second exposure regions 21 in the first row, the second row and the third row are all leftward along the row direction, and the alignment direction of the second exposure region 21 in the fourth row is rightward along the row direction in the alignment process of the second sub-pixel region in fig. 4 will be described as an example. In the region a, the region E and the region G, the synthesized domain vectors are all oriented to the upper left, in the region B, the region F and the region H, the synthesized domain vectors are all oriented to the lower left, in the region I, the synthesized domain vectors are oriented to the upper right, and in the region J, the synthesized domain vectors are oriented to the lower right, so that in eight domains formed by eight regions, the domain vectors of three regions are oriented to the upper left, the domain vectors of three regions are oriented to the lower left, the domain vectors of one region are oriented to the upper right, and the domain vectors of one region are oriented to the upper right. This is slightly inferior to the display effect of fig. 4 in that the number of regions facing the upper left, lower left, upper right, and lower right is two. This is because if the number of domain vectors in the eight regions is the same in the four directions, the orientation distribution of the domain vectors is more uniform, and the display effect is better.
The following describes a method of aligning light of the display panel according to the present embodiment with a specific example.
Fig. 5a to 5g are schematic diagrams illustrating an implementation process of a photo-alignment method for a display panel according to an embodiment of the present invention. In the present application, the alignment step is actually performed simultaneously for all the first sub-pixel regions 1 on the first substrate, while the alignment step is performed simultaneously for all the second sub-pixel regions 2 on the second substrate, and the traveling direction and the alignment direction of the respective substrates are parallel. However, in fig. 5a to 5g, for convenience of description, only the case of aligning one first sub-pixel region 1 or one second sub-pixel region 2 is shown, and the method for aligning the other first sub-pixel regions 1 on the first substrate and the other second sub-pixel regions 2 on the second substrate is similar to that in fig. 5a to 5g, and is not repeated here.
The implementation process of the light alignment method of the display panel of the embodiment includes the following steps:
s21, as shown in fig. 5a, dividing each first sub-pixel region 1 on the first substrate into two first exposure regions 11 arranged along the row direction, masking all the first exposure regions 11 of the first sub-pixel regions 1 on the first substrate on the right side of the row direction with a mask, and aligning the first exposure regions 11 on the left side of the row direction along the upward direction of the column direction.
S22, as shown in fig. 5b, the first exposure regions 11 on the left side of the row direction of all the first sub-pixel regions 1 on the first substrate are covered by a mask, and the first exposure regions 11 on the right side of the row direction are aligned in the downward direction of the column direction, in this step, the exposure amount is the same as that in step S21.
S23, as shown in fig. 5c, dividing each second sub-pixel region 2 on the second substrate into four second exposure regions 21 arranged along the column direction, covering the second exposure regions 21 of the second row, the third row and the fourth row of all the second sub-pixel regions 2 on the second substrate with a mask plate, and aligning the second exposure regions 21 in the first row along the left direction of the row direction.
S24, as shown in fig. 5d, the second exposure regions 21 in the first row, the third row and the fourth row in the column direction of all the second sub-pixel regions 2 on the second substrate are covered by a mask, and the second exposure regions 21 in the second row are aligned in the right direction along the row direction, and in this step, the exposure amount when performing alignment is the same as that in step S23.
S25, as shown in fig. 5e, the second exposure regions 21 in the first row, the second row and the fourth row in the column direction of all the second sub-pixel regions 2 on the second substrate are covered by a mask, and the second exposure regions 21 in the third row are aligned in the left direction along the row direction, and in this step, the exposure amount is different from that in step S23 when alignment is performed.
S26, as shown in fig. 5f, the second exposure regions 21 in the first row, the second row and the third row in the column direction of all the second sub-pixel regions 2 on the second substrate are covered by a mask, and the second exposure regions 21 in the fourth row are aligned in the right direction along the row direction, and in this step, the exposure amount when alignment is performed is the same as that in step S25.
S27, performing cell pairing on the aligned first substrate and second substrate to form the display panel of the present application, as shown in fig. 5g, an eight-domain structure of a region corresponding to the first sub-pixel region (second sub-pixel region) in the display panel after cell pairing is shown.
As can be seen in fig. 5g, the directions of the domain vectors are different in the eight regions, and thus an eight-domain structure is formed in the range of one sub-pixel unit.
In the present application, in order to change the pretilt angle of the liquid crystal in the liquid crystal region corresponding to the second exposure region, a method of changing the exposure amount or the alignment light irradiation angle in the alignment process may be adopted.
The larger the included angle is, the larger the pretilt angle of the liquid crystal generated in the liquid crystal layer by the alignment microstructure formed by alignment is, that is, the more violent the inclination degree of the liquid crystal molecules in the corresponding aligned area on the substrate is; conversely, the smaller the included angle, the smaller the pretilt angle of the liquid crystal generated in the liquid crystal layer by the alignment microstructure formed by alignment, i.e., the more slightly the corresponding aligned region on the substrate tilts the liquid crystal molecules.
In addition, the difference in the exposure amount in the alignment process can be achieved in three ways. Namely alignment illuminance, alignment light irradiation time and the distance between the mask plate and the alignment substrate.
And adopting different alignment illuminance to align the second exposure regions with the same alignment direction. The illuminance refers to the luminous flux of a unit area, and the larger the illuminance of alignment light is, the larger the pretilt angle of the alignment microstructure formed by alignment to the liquid crystal generated in the liquid crystal layer is, that is, the more severe the inclination degree of the liquid crystal molecules in the corresponding area after alignment on the substrate is; conversely, the smaller the illuminance of the alignment light, the smaller the pretilt angle of the liquid crystal generated in the liquid crystal layer by the alignment microstructure formed by alignment, i.e., the more slightly the corresponding aligned region on the substrate tilts the liquid crystal molecules.
Different alignment light irradiation time is adopted to align the second exposure areas with the same alignment direction, and the longer the time is, the larger the pretilt angle of the liquid crystal generated in the liquid crystal layer by the alignment microstructure formed by alignment is, namely, the more violent the inclination degree of the liquid crystal molecules in the corresponding aligned areas on the substrate is; conversely, the shorter the time, the smaller the pretilt angle of the liquid crystal generated in the liquid crystal layer by the alignment microstructure formed by alignment, i.e., the more slightly the corresponding aligned regions on the substrate tilt the liquid crystal molecules.
When the second exposure areas with the same alignment direction are aligned, the distances between the mask plate and the second exposure areas are different. If the distance between the alignment light source and the mask plate is kept unchanged, when the distance between the mask plate and each second exposure area is smaller, the pretilt angle of the liquid crystal generated in the liquid crystal layer by the alignment microstructure formed by alignment is larger, namely, the inclination degree of liquid crystal molecules in the corresponding area after alignment on the substrate is more severe; on the contrary, when the distance between the mask plate and each second exposure area is larger, the pretilt angle of the liquid crystal generated in the liquid crystal layer by the alignment microstructure formed by alignment is smaller, that is, the inclination degree of the liquid crystal molecules in the corresponding area after alignment on the substrate is smaller.
In addition, as long as the purpose of changing the pretilt angle of the liquid crystal can be achieved, the four factors of the alignment illumination angle, the alignment illuminance, the alignment light irradiation time and the distance between the mask plate and the alignment substrate can be randomly arranged and combined.
In the photoalignment method of the display panel of this embodiment, the display panel includes a first substrate and a second substrate disposed opposite to the first substrate, a liquid crystal layer is disposed between the first substrate and the second substrate, the first substrate includes a plurality of first sub-pixel regions arranged in an array, the second substrate includes a plurality of second sub-pixel regions corresponding to the plurality of first sub-pixel regions, and when the first substrate and the second substrate are opposite to each other, each of the first sub-pixel regions coincides with its corresponding second sub-pixel region, the method includes: dividing each first sub-pixel area into two first exposure areas arranged along a first arrangement direction, and respectively carrying out alignment on the first exposure areas along a second arrangement direction, wherein the alignment directions of different first exposure areas are opposite, the first arrangement direction and the second arrangement direction are both located in a plane where the first substrate is located, and the first arrangement direction and the second arrangement direction are vertical; and dividing each second sub-pixel area into at least two second exposure areas arranged along a second arrangement direction, and respectively aligning the second exposure areas along the first arrangement direction, wherein the second exposure areas with the same alignment direction have different exposure and/or alignment light irradiation angles during alignment. The photo-alignment method of the present embodiment realizes the eight-domain structure of the sub-pixel region only by virtue of the improvement of the alignment process. Compared with the scheme of realizing multi-domain by an electrical method in the prior art, the method has the advantages of simple realization and low cost because no additional TFT switch or different Data/Gata wiring design is needed. Meanwhile, the reliability of the finished product is greatly improved.
Example two
The embodiment also provides a display panel, which is manufactured by adopting the display panel optical alignment method in the first embodiment, and the display panel can be a component for displaying in products such as electronic paper, a tablet personal computer, a liquid crystal display, a liquid crystal television, a digital photo frame and a mobile phone. The specific steps, processes and principles of the optical alignment method of the display panel have been described in detail in the first embodiment, and are not described herein again.
The display panel of the present embodiment is manufactured by using the photo-alignment method of the display panel of the first embodiment, and thus compared with the scheme of electrically implementing a multi-domain in the prior art, the display panel of the present embodiment does not need to additionally perform TFT switching or different Data/Gata wiring designs, and thus is simpler to implement and lower in cost.
The embodiment also provides a display device, which includes the display panel, and the display device may be any product or component having a display function, such as a liquid crystal display device, electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator, and the like.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A photo-alignment method of a display panel, the display panel including a first substrate and a second substrate arranged opposite to the first substrate, a liquid crystal layer being interposed between the first substrate and the second substrate, the first substrate including a plurality of first sub-pixel regions arranged in an array, the second substrate including a plurality of second sub-pixel regions corresponding to the plurality of first sub-pixel regions, each of the first sub-pixel regions coinciding with the corresponding second sub-pixel region when the first substrate and the second substrate are opposite to each other, the method comprising:
dividing each first sub-pixel area into two first exposure areas arranged along a first arrangement direction, and respectively aligning the first exposure areas along a second arrangement direction, wherein the alignment directions of the different first exposure areas are opposite, the first arrangement direction and the second arrangement direction are both located in a plane where the first substrate is located, and the first arrangement direction and the second arrangement direction are vertical;
dividing each second sub-pixel region into four second exposure regions arranged along the second arrangement direction, and respectively aligning the second exposure regions along the first arrangement direction, wherein the alignment directions of two adjacent second exposure regions are opposite, and the second exposure regions with the same alignment direction have different exposure and alignment light irradiation angles during alignment;
each second exposure region with the same alignment direction has different exposure amounts during alignment, and specifically comprises the following steps: when all the second exposure areas with the same alignment direction are aligned, the distance between the alignment light source and a mask plate is kept unchanged, and the distances between the mask plate and the second exposure areas are different.
2. The photo-alignment method according to claim 1, wherein the second exposure regions with the same alignment direction have different exposure amounts during alignment, and specifically comprises: and adopting different alignment illuminance to align the second exposure regions with the same alignment direction.
3. The photo-alignment method according to claim 1, wherein the second exposure regions with the same alignment direction have different exposure amounts during alignment, and specifically comprises: and aligning the second exposure regions with the same alignment direction by adopting different alignment light irradiation time.
4. A photoalignment method according to any of claims 1 to 3, wherein the number of second exposure regions with opposite alignment directions in the second exposure regions is the same.
5. A photoalignment method according to any of claims 1 to 3, wherein the exposure and the alignment light irradiation angle are the same for all the first exposure regions.
6. A display panel produced by the photoalignment method according to any one of claims 1 to 5.
7. A display device comprising the display panel according to claim 6.
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| CN111552124B (en) * | 2020-05-26 | 2022-09-23 | 武汉京东方光电科技有限公司 | Optical alignment equipment and method |
| CN113867052B (en) * | 2021-09-09 | 2023-11-10 | 京东方科技集团股份有限公司 | Light alignment method of display panel, display panel and display device |
| CN114609831B (en) * | 2022-04-22 | 2023-11-10 | 京东方科技集团股份有限公司 | Light alignment method of display panel, display panel and display device |
| CN117480444A (en) * | 2022-04-29 | 2024-01-30 | 京东方科技集团股份有限公司 | Display panel, manufacturing method thereof and display device |
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