A polarizer and its preparation method, and a display panel

Abstract

This application provides a polarizer and its preparation method, as well as a display panel. The polarizer includes a dihedral material and a substrate with an integrated structure. The substrate includes lyotropic liquid crystal molecules. The portion of the substrate in which the dihedral material is dispersed is a first portion, and the portion of the substrate in which the dihedral material is not dispersed is a second portion. The polarizer has a polarizing section and a compensating section. The first portion and the dihedral material constitute the polarizing section, and the second portion is the compensating section. In the polarizer provided by this application, the substrate including the lyotropic liquid crystal molecules itself has a compensating function, thereby forming the compensating section in the second portion of the substrate in which the dihedral material is not dispersed. The dihedral material dispersed in the first portion of the substrate can form the polarizing section with the first portion. Furthermore, since the polarizing section corresponds to the first portion of the substrate, and the compensating section corresponds to the second portion of the substrate, and the first and second portions are an integrated structure, the complex preparation process of the polarizer can be simplified, and the thickness of the polarizer can be reduced.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a polarizer and its preparation method, and a display panel. Background Technology

[0002] With the development of display technology, flat panel display devices such as liquid crystal displays (LCDs) have become the mainstream display devices due to their advantages such as high image quality, energy saving, thin body and wide range of applications. They are widely used in various consumer electronic products such as mobile phones, televisions, personal digital assistants, digital cameras, laptops, and desktop computers.

[0003] To realize the display function of a liquid crystal display panel, polarizers need to be set on both sides of the liquid crystal display panel. The polarizer includes a polarizing part. The liquid crystal molecules in the vertically aligned (VA) liquid crystal display panel have birefringence characteristics, which requires an additional compensation part to be added to the polarizer. Moreover, the compensation part and the polarizing part need to be formed into films separately, which makes the manufacturing process of the polarizer complex and the thickness thick. This problem urgently needs to be solved. Summary of the Invention

[0004] This application provides a polarizer and its preparation method, as well as a display panel, which can effectively solve the problems of complex preparation process and thick thickness of polarizers.

[0005] In a first aspect, this application provides a polarizer, the polarizer comprising a dihedral material and a substrate with an integral structure; wherein, the substrate with the integral structure comprises lyotropic liquid crystal molecules, a portion of the substrate in which the dihedral material is dispersed is a first portion, a portion of the substrate in which the dihedral material is not dispersed is a second portion, and the first portion is located on one side of the second portion; wherein, the polarizer has a polarizing portion and a compensating portion, the first portion and the dihedral material constituting the polarizing portion, and the second portion constituting the compensating portion.

[0006] Optionally, the lyotropic liquid crystal molecules in the second part are aligned in the same direction as the lyotropic liquid crystal molecules in the first part.

[0007] Optionally, the dihedral material includes iodide ions and iodide ion complexes.

[0008] Optionally, the combined thickness of the second part and the first part is greater than or equal to 15 μm.

[0009] Optionally, the thickness of the first part is greater than or equal to 7 μm, and the thickness of the second part is greater than or equal to 0.5 μm.

[0010] Optionally, the polarizer includes a support layer disposed on the side of the polarizer opposite to the compensation section.

[0011] Secondly, this application provides a display panel, the display panel including at least one polarizer as described in any of the above claims, the display panel further including an array substrate, a color filter substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate, the liquid crystal molecules in the liquid crystal layer having birefringence characteristics, wherein at least one polarizer includes: a first polarizer disposed on the side of the array substrate opposite to the liquid crystal layer, the polarizing portion of the first polarizer being disposed on the side of the compensation portion opposite to the array substrate; and / or, a second polarizer disposed on the side of the color filter substrate opposite to the liquid crystal layer, the polarizing portion of the second polarizer being disposed on the side of the compensation portion opposite to the color filter substrate.

[0012] Optionally, the display panel includes a first polarizer and a second polarizer, wherein the slow axis direction of the compensation portion in the first polarizer is perpendicular to the slow axis direction of the compensation portion in the second polarizer, the fast axis direction of the compensation portion in the first polarizer is perpendicular to the fast axis direction of the compensation portion in the second polarizer, and the light transmission axis direction of the polarizing portion in the first polarizer is perpendicular to the light transmission axis direction of the polarizing portion in the second polarizer.

[0013] Optionally, the compensation portion in the first polarizer is disposed on the surface of the array substrate facing away from the liquid crystal layer, and the compensation portion in the second polarizer is disposed on the surface of the color filter substrate facing away from the liquid crystal layer.

[0014] Optionally, the first polarizer further includes a first substrate, which is disposed on the side of the array substrate away from the liquid crystal layer, and the compensation portion in the first polarizer is disposed on the surface of the first substrate on the side away from the array substrate; the second polarizer further includes a second substrate, which is disposed on the side of the color filter substrate away from the liquid crystal layer, and the compensation portion in the second polarizer is disposed on the surface of the second substrate on the side away from the color filter substrate.

[0015] Thirdly, this application provides a method for preparing a polarizer, the method comprising the following steps:

[0016] A carrier film layer is provided, and a substrate with an integral structure is orientedly coated on the carrier film layer, the substrate with the integral structure comprising lyotropic liquid crystal molecules;

[0017] A bidirectional material is coated on the surface of the substrate of the integrated structure, and the dispersion time of the bidirectional material is controlled so that the bidirectional material is dispersed in the first part of the substrate and the bidirectional material is not dispersed in the second part of the substrate.

[0018] The first part is located on one side of the second part, the polarizer has a polarizing part and a compensation part, the first part and the dihedral material constitute the polarizing part, and the second part is the compensation part.

[0019] Optionally, the dihedral material includes iodide ions and iodide ion complexes, the sum of the thicknesses of the second part and the first part is greater than or equal to 15 μm, and the dispersion time of the dihedral material is 20-100 seconds.

[0020] Optionally, the thickness of the first part is greater than or equal to 7 μm, and the thickness of the second part is greater than or equal to 0.5 μm.

[0021] This application provides a polarizer and its preparation method, and a display panel. The polarizer includes a dihedral material and a substrate with an integral structure. The substrate with the integral structure includes lyotropic liquid crystal molecules. The portion of the substrate in which the dihedral material is dispersed is a first portion, and the portion of the substrate in which the dihedral material is not dispersed is a second portion. The first portion is located on one side of the second portion. The polarizer has a polarizing portion and a compensating portion. The first portion and the dihedral material constitute the polarizing portion, and the second portion is the compensating portion. In the polarizer provided in this application embodiment, since the substrate includes lyotropic liquid crystal molecules, the substrate itself can have a compensation function, thereby forming a compensation portion in the second part of the substrate where the dihedral material is not dispersed. Since the dihedral material is dispersed in the first part of the substrate, a polarizing portion can be formed through the first part and the dihedral material. Furthermore, since the polarizing portion corresponds to the first part of the substrate and the compensation portion corresponds to the second part of the substrate, and the first part and the second part are an integral structure, the problem of complex polarizer fabrication process and thicker thickness caused by the need for separate film formation of the polarizing portion and the compensation portion can be effectively avoided, simplifying the complex polarizer fabrication process and reducing the thickness of the polarizer. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a cross-sectional schematic diagram of a polarizer provided in Embodiment 1 of this application.

[0024] Figure 2 This is a cross-sectional schematic diagram of the display panel provided in Embodiment 1 of this application.

[0025] Figure 3 This is a schematic flowchart illustrating the method for preparing a polarizer according to Embodiment 1 of this application.

[0026] Figure 4 This is a cross-sectional schematic diagram of a polarizer provided in Embodiment 2 of this application.

[0027] Figure 5 This is a cross-sectional schematic diagram of the display panel provided in Embodiment 2 of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] Polarizer 10; First polarizer 101; Second polarizer 102; Substrate 11; First portion 111; Second portion 112; Dichroic material 12; Support layer 13; Substrate 14; First substrate 141; Second substrate 142; Polarizing section M1; Compensation section M2; Array substrate 21; Color filter substrate 22; Liquid crystal layer 23 Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0031] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials. Detailed descriptions are provided below; it should be noted that the order of description of the following embodiments is not intended to limit the preferred order of embodiments.

[0032] Example 1

[0033] Figure 1 This is a cross-sectional schematic diagram of a polarizer provided in Embodiment 1 of this application. (Refer to...) Figure 1 As shown, in a first aspect, Embodiment 1 of this application provides a polarizer 10.

[0034] In some embodiments of this application, the polarizer 10 includes a dihedral material 12 and a substrate 11 with an integral structure; wherein, the substrate 11 with an integral structure includes lyotropic liquid crystal molecules, the portion of the substrate 11 in which the dihedral material 12 is dispersed is a first portion 111, and the portion of the substrate 11 in which the dihedral material 12 is not dispersed is a second portion 112, and the first portion 111 is located on one side of the second portion 112; wherein, the polarizer 10 has a polarizing part M1 and a compensating part M2, the first portion 111 and the dihedral material 12 constitute the polarizing part M1, and the second portion 112 is the compensating part M2.

[0035] In the polarizer 10 provided in this embodiment, since the substrate 11 includes lyotropic liquid crystal molecules, the substrate 11 itself can have a compensation function, thereby forming a compensation part M2 in the second part 112 of the substrate 11 without the dihedral material 12 dispersed therein. Since the dihedral material 12 is dispersed in the first part 111 of the substrate 11, a polarizing part M1 can be formed by the first part 111 and the dihedral material 12. Furthermore, since the polarizing part M1 corresponds to the first part 111 of the substrate 11 and the compensation part M2 corresponds to the second part 112 of the substrate 11, and the first part 111 and the second part 112 are an integral structure, the problem of complex manufacturing process and thick thickness of the polarizer 10 caused by the need for separate film formation of the polarizing part M1 and the compensation part M2 can be effectively avoided, simplifying the complex manufacturing process of the polarizer 10 and reducing the thickness of the polarizer 10.

[0036] In the polarizer 10 provided in this application embodiment, the substrate 11 forming the integral structure can be formed by directional coating. The substrate 11 of the integral structure is a lyotropic liquid crystal layer, and the first portion 111 and the second portion 112 are part of the lyotropic liquid crystal layer and both include lyotropic liquid crystal molecules. Therefore, the first portion 111 including lyotropic liquid crystal molecules and the second portion 112 including lyotropic liquid crystal molecules can be formed by directional coating of the lyotropic liquid crystal layer.

[0037] During the research, the applicant discovered that lyotropic liquid crystal molecules without the dichroic material 12 are uniaxial crystals with birefringence. By adjusting the material of the lyotropic liquid crystal molecules, their refractive indices in the horizontal, vertical, and longitudinal directions can be adjusted, thereby enabling the oriented lyotropic liquid crystal layer to possess phase difference compensation functionality. That is, the compensation section M2 can be formed using a lyotropic liquid crystal layer without the dichroic material 12. Furthermore, the applicant also discovered that when the dichroic material 12 is coated onto the lyotropic liquid crystal layer, the dichroic material 12 will… The material 12 is dispersed from the surface of the lyotropic liquid crystal layer into its interior and then oriented after curing, thereby giving the lyotropic liquid crystal layer containing the dihedral material 12 a polarization function. That is, a polarizing portion M1 can be formed by dispersing the dihedral material 12 in the lyotropic liquid crystal layer. Furthermore, the applicant unexpectedly discovered that when the dihedral material 12 is coated on the lyotropic liquid crystal layer, the dihedral material 12 disperses from the surface of the lyotropic liquid crystal layer into its interior. The dispersion depth of the dihedral material 12 is positively correlated with the dispersion time, and the dispersion time can be artificially controlled. In actual production, the dispersion depth of the dihedral material 12 can be accurately controlled by controlling the dispersion time. Therefore, by controlling the dispersion depth of the dihedral material 12, the lower part of the lyotropic liquid crystal layer (i.e., the second part 112 of the substrate 11) will not contain the dihedral material 12, serving as the compensation part M2 of the polarizer 10, while the upper part of the lyotropic liquid crystal layer (i.e., the first part 111 of the substrate 11) will contain the dihedral material 12, serving as the polarizing part M1 of the polarizer 10. Thus, the substrate 11 with the integral structure can be formed using a single coating process, and the compensation part M2 and the polarizing part M1 can be formed by controlling the dispersion time of the dihedral material 12. This simplifies the fabrication process of the polarizer 10 and makes the polarizer 10 thinner.

[0038] In some embodiments of this application, the lyotropic liquid crystal molecules in the second portion 112 are arranged in the same direction as the lyotropic liquid crystal molecules in the first portion 111.

[0039] In the polarizer 10 provided in this application, since both the second portion 112 and the first portion 111 include lyotropic liquid crystal molecules, a substrate 11 including the second portion 112 and the first portion 111 can be formed integrally by directionally coating a lyotropic liquid crystal layer. That is, the second portion 112 and the first portion 111 are formed in a single directional coating process; therefore, the lyotropic liquid crystal molecules in the second portion 112 and the lyotropic liquid crystal molecules in the first portion 111 are aligned in the same direction.

[0040] In some embodiments of this application, the dihedral material 12 includes iodide ions and iodide ion complexes.

[0041] In the polarizer 10 provided in this application, when the dihedral material 12 is an iodine-based material including iodide ions and iodide ion complexes, the dispersion speed of the dihedral material 12 in the lyotropic liquid crystal layer is more controllable compared to other dihedral materials 12. This can minimize the possibility that the dihedral material 12 will disperse into the second part 112 due to excessively fast dispersion speed when it is dispersed in the lyotropic liquid crystal layer. This makes it easier for the polarizer 10 to form the compensation part M2 without the dihedral material 12 and the polarizing part M1 with the dihedral material 12 dispersed, which is beneficial to improving the preparation yield of the polarizer 10.

[0042] In some embodiments of this application, the sum of the thicknesses of the second portion 112 and the first portion 111 is greater than or equal to 15 μm.

[0043] In the polarizer 10 provided in this application, the sum of the thicknesses of the second portion 112 and the first portion 111 is the total thickness of the lyotropic liquid crystal layer. When the dispersion speed of the dihedral material 12 in the lyotropic liquid crystal layer is fixed, the smaller the thickness of the lyotropic liquid crystal layer, the shorter the time it takes for the dihedral material 12 to disperse from the top surface to the bottom of the lyotropic liquid crystal layer. This makes it easier for the dihedral material 12 to disperse into the second portion 112, affecting the performance of the compensation part M2. This application controls the sum of the thicknesses of the second portion 112 and the first portion 111 to be above 15 μm, enabling the time for the dihedral material 12 to disperse from the top surface of the lyotropic liquid crystal layer to the bottom to be above a threshold range. This minimizes the possibility of the dihedral material 12 being dispersed into the second portion 112 due to excessively fast dispersion speed during dispersion in the lyotropic liquid crystal layer. Consequently, the polarizer 10 is more likely to form the compensation portion M2 without the dihedral material 12 and the polarizing portion M1 with the dihedral material 12, thereby improving the fabrication yield of the polarizer 10.

[0044] In some embodiments of this application, the thickness of the first portion 111 is greater than or equal to 7 μm, and the thickness of the second portion 112 is greater than or equal to 0.5 μm.

[0045] In the polarizer 10 provided in this application, since the thickness of the first part 111 is greater than or equal to 7 μm and the thickness of the second part 112 is greater than or equal to 0.5 μm, the dihedral material 12 in the first part 111 can have a certain dispersion depth, making the dispersion time of the dihedral material 12 easier to control. This improves the polarization effect of the polarizing part M1 while avoiding the problem that the thickness of the compensation part M2 is insufficient and the compensation effect is reduced due to the first part 111 having an excessively large thickness ratio and excessive diffusion depth in the lyotropic liquid crystal layer.

[0046] Specifically, the applicant verified through experiments that as the dispersion time of the bidirectional material 12 increases, the diffusion depth of the bidirectional material 12 in the first portion 111 continuously increases. Taking the substrate 11 with a dry film thickness of 15 μm as an example, when the dispersion time of the bidirectional material 12 is 20 seconds, the diffusion depth of the bidirectional material 12 in the first portion 111 is 7 μm, and at this time, the thickness of the first portion 111 is 7 μm; when the dispersion time of the bidirectional material 12 is 30 seconds, the diffusion depth of the bidirectional material 12 in the first portion 111 is 9 μm, and at this time, the thickness of the first portion 111 is 9 μm; when the dispersion time of the bidirectional material 12 is 15 μm, the diffusion depth of the bidirectional material 12 in ... When the dispersion time of the dihedral material 12 is 40 seconds, the diffusion depth of the dihedral material 12 in the first part 111 is 10 μm, and the thickness of the first part 111 is 10 μm; when the dispersion time of the dihedral material 12 is 50 seconds, the diffusion depth of the dihedral material 12 in the first part 111 is 11 μm, and the thickness of the first part 111 is 11 μm; when the dispersion time of the dihedral material 12 is 60 seconds, the diffusion depth of the dihedral material 12 in the first part 111 is 10 μm. The diffusion depth of the dihedral material 12 is 12 μm, at which point the thickness of the first portion 111 is 12 μm; when the dispersion time of the dihedral material 12 is 70 seconds, the diffusion depth of the dihedral material 12 in the first portion 111 is 12.8 μm, at which point the thickness of the first portion 111 is 12.8 μm; when the dispersion time of the dihedral material 12 is 80 seconds, the diffusion depth of the dihedral material 12 in the first portion 111 is 13.5 μm, at which point... The thickness of the first portion 111 is 13.5 μm; when the dispersion time of the dihedral material 12 is 90 seconds, the diffusion depth of the dihedral material 12 in the first portion 111 is 14 μm, and at this time, the thickness of the first portion 111 is 14 μm; when the dispersion time of the dihedral material 12 is 100 seconds, the diffusion depth of the dihedral material 12 in the first portion 111 is 14.3 μm, and at this time, the thickness of the first portion 111 is 14.3 μm.

[0047] In some embodiments of this application, the polarizer 10 includes a support layer 13, which is disposed on the side of the polarizer M1 away from the compensation part M2.

[0048] In the polarizer 10 provided in this application, the polarizer 10 includes only one support layer 13. The support layer 13 is disposed on the side of the polarizer M1 away from the compensation film. That is, the layer of the compensation part M2 away from the polarizer M1 is not provided with a support layer. Compared with the related technology, which requires support layers to be provided on opposite sides of the polarizer M1, the polarizer 10 can have a thinner thickness and a simpler film structure, which can further reduce the manufacturing cost of the polarizer 10.

[0049] Specifically, the support layer 13 is used to protect the polarizer 10. The support layer 13 is made of tri-cellulose acetate (TAC), polymethyl methacrylate (PMMA), or cycloolefin polymer (COP). Since the substrate 11 of the polarizer 10 provided in this application, including the second part 112 and the first part 111, can be formed by directional coating of a lyotropic liquid crystal layer, the carrier film layer of the lyotropic liquid crystal layer (substrate 11) can be directly used as the protective film layer of the polarizer 10, thereby eliminating the need for a support layer 13 in the polarizer 10. When the carrier film layer is a substrate in a display panel, the substrate in the display panel can be used as the protective film layer of the polarizer 10, thereby ensuring the stability of the polarizer 10 while reducing the thickness of the polarizer 10 and simplifying the film layer structure of the polarizer 10.

[0050] In some embodiments of this application, the slow axis direction of the compensation part M2 is parallel or perpendicular to the light transmission axis direction of the polarizing part M1.

[0051] In the polarizer 10 provided in this application, since the lyotropic liquid crystal molecules have birefringence characteristics, the lyotropic liquid crystal molecules in the second part 112 have a fast axis and a slow axis. This application can ensure the compensation effect of the compensation part M2 at a large viewing angle by making the slow axis direction of the compensation part M2 parallel or perpendicular to the light transmission axis direction of the polarizer M1.

[0052] In some embodiments of the present application, in order to ensure the compensation effect of the compensation portion M2 at a large viewing angle, the compensation values of the compensation portion M2 meet the following requirements: 10 nm<Re<250 nm, 50 nm<Rth<400 nm, wherein Re=(n1-n2)*d, Rth=[(n1+n2) / 2-n3]*d. Re is the compensation value of the compensation portion M2 in the horizontal direction parallel to the polarizer 10, Rth is the compensation value of the compensation portion M2 in the vertical direction perpendicular to the polarizer 10, n1 is the refractive index of the compensation portion M2 in the transverse direction of the horizontal direction, n2 is the refractive index of the compensation portion M2 in the longitudinal direction of the horizontal direction, n3 is the refractive index of the compensation portion M2 in the vertical direction, and d is the thickness of the compensation portion M2 in the vertical direction.

[0053] Figure 2 is a schematic cross-sectional view of a display panel provided in Embodiment 1 of the present application. With reference to Figure 2 , in a second aspect, the present application further provides a display panel, wherein the display panel comprises at least one polarizer 10 according to any one of the above, the display panel further comprises an array substrate 21, a color filter substrate 22, and a liquid crystal layer 23 arranged between the array substrate 21 and the color filter substrate 22, liquid crystal molecules in the liquid crystal layer 23 have birefringence characteristics, wherein at least one polarizer 10 comprises: a first polarizer 101 arranged on a side of the array substrate 21 away from the liquid crystal layer 23, wherein the polarizing portion M1 in the first polarizer 101 is arranged on a side of the compensation portion M2 away from the array substrate 21; and / or a second polarizer 102 arranged on a side of the color filter substrate 22 away from the liquid crystal layer 23, wherein the polarizing portion M1 in the second polarizer 102 is arranged on a side of the compensation portion M2 away from the color filter substrate 22.

[0054] In the display panel provided by the present application, the liquid crystal layer 23 arranged between the array substrate 21 and the color filter substrate 22 has birefringence characteristics. When there is no compensation portion M2 in the polarizer 10, the display effect of the display panel will be seriously affected, which is the reason why the polarizer 10 provided by the present application comprises the compensation portion M2. Optionally, the display panel is a vertically aligned liquid crystal display panel with good display effect at large viewing angles, the array substrate 21 comprises pixel electrodes, and the color filter substrate 22 comprises common electrodes.

[0055] With reference to Figure 2As shown, in some embodiments of this application, the display panel includes a first polarizer 101 and a second polarizer 102. The slow axis direction of the compensation portion M2 in the first polarizer 101 is perpendicular to the slow axis direction of the compensation portion M2 in the second polarizer 102. The fast axis direction of the compensation portion M2 in the first polarizer 101 is perpendicular to the fast axis direction of the compensation portion M2 in the second polarizer 102. The light transmission axis direction of the polarizer M1 in the first polarizer 101 is perpendicular to the light transmission axis direction of the polarizer M1 in the second polarizer 102.

[0056] In the display panel provided in this application, since the slow axis direction of the compensation part M2 in the first polarizer 101 is perpendicular to the slow axis direction of the compensation part M2 in the second polarizer 102, and the fast axis direction of the compensation part M2 in the first polarizer 101 is perpendicular to the fast axis direction of the compensation part M2 in the second polarizer 102, the display adaptability of the compensation part M2 in the first polarizer 101 and the compensation part M2 in the second polarizer 102 with the vertically aligned liquid crystal display panel can be guaranteed; the light transmission axis direction of the polarizing part M1 in the first polarizer 101 is perpendicular to the light transmission axis direction of the polarizing part M1 in the second polarizer 102, thus ensuring the display adaptability of the polarizing part M1 in the first polarizer 101 and the polarizing part M1 in the second polarizer 102 with the vertically aligned liquid crystal display panel.

[0057] Of course, in other embodiments of this application, the display panel may include only the first polarizer 101 or the second polarizer 102. When the display panel includes only the first polarizer 101 or the second polarizer 102, the display panel also includes a conventional polarizer disposed opposite to the first polarizer 101 or the second polarizer 102. The conventional polarizer has a different structure from the first polarizer 101 or the second polarizer 102. In this case, the slow axis of the compensation part M2 in the first polarizer 101 is perpendicular to the light transmission axis of the polarizer M1, or the slow axis of the compensation part M2 in the second polarizer 102 is perpendicular to the light transmission axis of the polarizer M1.

[0058] In some embodiments of this application, the compensation portion M2 in the first polarizer 101 is disposed on the surface of the array substrate 21 opposite to the liquid crystal layer 23. This utilizes the substrate in the array substrate 21 as a carrier film layer for the first polarizer 101 and as a protective film layer for the compensation portion M2 in the first polarizer 101. This avoids the problems of increased thickness and complex film structure of the first polarizer 101 caused by additionally providing a support layer 13 on the side of the compensation portion M2 opposite to the polarizer M1. Optionally, the substrate in the array substrate 21 can be a glass substrate.

[0059] In some embodiments of this application, the compensation portion M2 in the second polarizer 102 is disposed on the surface of the color filter substrate 22 on the side opposite to the liquid crystal layer 23. This utilizes the substrate in the color filter substrate 22 as a carrier film layer for the second polarizer 102 and as a protective film layer for the compensation portion M2, thus avoiding the problems of increased thickness and complex film structure of the second polarizer 102 caused by additionally providing a support layer 13 on the side of the compensation portion M2 opposite to the polarizer M1. Optionally, the substrate in the color filter substrate 22 can be a glass substrate.

[0060] Figure 3 This is a schematic flowchart illustrating the method for preparing the polarizer provided in Embodiment 1 of this application. (Refer to...) Figure 1-3 As shown, in a third aspect, Embodiment 1 of this application also provides a method for preparing a polarizer 10, used to prepare the polarizer 10 described in any of the above claims. The method for preparing the polarizer 10 includes the following steps: step S01 and step S02.

[0061] Step S01 includes providing a carrier film layer and directionally coating a substrate 11 to form an integral structure on the carrier film layer. The integral structure substrate 11 includes lyotropic liquid crystal molecules.

[0062] Step S02 includes: coating a bidirectional material 12 on the surface of the substrate 11 of the integral structure, and controlling the dispersion time of the bidirectional material 12 so that the bidirectional material 12 is dispersed in the first part 111 of the substrate 11, and the bidirectional material 12 is not dispersed in the second part 112 of the substrate 11.

[0063] The first part 111 is located on one side of the second part 112. The polarizer has a polarizing part M1 and a compensation part M2. The first part 111 and the dihedral material 12 constitute the polarizing part M1, and the second part 112 is the compensation part M2.

[0064] In the polarizer 10 prepared by the method provided in this application, since the dihedral material 12 is only dispersed in the first part 111 and not in the second part 112, the first part 111 and the dihedral material 12 dispersed in the first part 111 can form the polarizing part M1 of the polarizer 10, and the second part 112 can serve as the compensation part M2 of the polarizer 10. Furthermore, since the polarizing part M1 corresponds to the first part 111 of the substrate 11 and the compensation part M2 corresponds to the second part 112 of the substrate 11, and the first part 111 and the second part 112 are an integral structure, the complex preparation process of the polarizer 10 can be simplified and the thickness of the polarizer 10 can be reduced.

[0065] Furthermore, since the substrate 11, including the second portion 112 and the first portion 111, can be integrally formed by directional coating of a lyotropic liquid crystal layer, the fabrication efficiency of the polarizer 10 can be improved, and the manufacturing cost of the polarizer 10 can be reduced. Moreover, compared to conventional polarizers formed by roll-to-roll film fabrication technology in related technologies, it is not limited by width, thus enabling its use in fabricating ultra-large display panels, such as display panels larger than 75 inches.

[0066] In some embodiments of this application, the dihedral material 12 includes iodide ions and iodide ion complexes, the sum of the thicknesses of the second portion 112 and the first portion 111 is greater than or equal to 15 μm, and the dispersion time of the dihedral material 12 is 20-100 seconds.

[0067] This application utilizes an iodine-based dihedral material 12, comprising iodine ions and iodine ion complexes, whose dispersion rate in the lyotropic liquid crystal layer is more controllable, and controls the dispersion time of the iodine-based dihedral material 12 to 20-100 seconds. This enables the iodine-based dihedral material 12 to form a second portion 112 of undispersed iodine-based dihedral material 12 and a first portion 111 of dispersed iodine-based dihedral material 12 when dispersed in a lyotropic liquid crystal layer with a thickness of 15 μm or more, thereby greatly improving the preparation yield of the polarizer 10.

[0068] In some embodiments of this application, the thickness of the first portion 111 is greater than or equal to 7 μm, and the thickness of the second portion 112 is greater than or equal to 0.5 μm.

[0069] In the polarizer 10 prepared by the polarizer preparation method provided in this application, since the thickness of the first part 111 is greater than or equal to 7 μm and the thickness of the second part 112 is greater than or equal to 0.5 μm, the dihedral material 12 in the first part 111 can have a certain dispersion depth, making the dispersion time of the dihedral material 12 easier to control. This improves the polarization effect of the polarizer M1 while avoiding the problem that the thickness of the compensation part M2 is insufficient and the compensation effect is reduced due to the first part 111 having an excessively large thickness proportion and excessive diffusion depth in the lyotropic liquid crystal layer.

[0070] Specifically, the applicant verified through experiments that as the dispersion time of the bidirectional material 12 increases, the diffusion depth of the bidirectional material 12 in the first portion 111 continuously increases. Taking a substrate 11 with a dry film thickness of 15 μm as an example, when the dispersion time of the bidirectional material 12 is 20 seconds, the diffusion depth of the bidirectional material 12 in the first portion 111 is 7 μm, and at this time, the thickness of the first portion 111 is 7 μm; when the dispersion time of the bidirectional material 12 is 30 seconds, the diffusion depth of the bidirectional material 12 in the first portion 111 is 9 μm, and at this time, the thickness of the first portion 111 is 9 μm; when the dispersion time of the bidirectional material 12 is 15 μm, the diffusion depth of the bidirectional material 12 in ... When the dispersion time is 40 seconds, the diffusion depth of the dihedral material 12 in the first part 111 is 10 μm, and the thickness of the first part 111 is 10 μm; when the dispersion time of the dihedral material 12 is 50 seconds, the diffusion depth of the dihedral material 12 in the first part 111 is 11 μm, and the thickness of the first part 111 is 11 μm; when the dispersion time of the dihedral material 12 is 60 seconds, the diffusion depth of the dihedral material 12 in the first part 111 is 10 μm. When the diffusion depth of the dihedral material 12 is 12 μm, the thickness of the first portion 111 is also 12 μm. When the dispersion time of the dihedral material 12 is 70 seconds, the diffusion depth of the dihedral material 12 in the first portion 111 is 12.8 μm, and the thickness of the first portion 111 is also 12.8 μm. When the dispersion time of the dihedral material 12 is 80 seconds, the diffusion depth of the dihedral material 12 in the first portion 111 is 13.5 μm. The thickness of the first portion 111 is 13.5 μm; when the dispersion time of the dihedral material 12 is 90 seconds, the diffusion depth of the dihedral material 12 in the first portion 111 is 14 μm, and at this time, the thickness of the first portion 111 is 14 μm; when the dispersion time of the dihedral material 12 is 100 seconds, the diffusion depth of the dihedral material 12 in the first portion 111 is 14.3 μm, and at this time, the thickness of the first portion 111 is 14.3 μm.

[0071] In some embodiments of this application, the carrier film layer is the substrate of the array substrate 21 or the substrate of the color filter substrate 22.

[0072] In some embodiments of this application, the coating direction of the lyotropic liquid crystal layer is the same as the light absorption axis direction of the polarizing portion M1. Further, during the fabrication of the first polarizer 101 and the second polarizer 102, the arrangement direction of the lyotropic liquid crystal molecules in the second portion 112 of the first polarizer 101 is perpendicular to the arrangement direction of the lyotropic liquid crystal molecules in the second portion 112 of the second polarizer 102; the arrangement direction of the lyotropic liquid crystal molecules in the first portion 111 of the first polarizer 101 is perpendicular to the arrangement direction of the lyotropic liquid crystal molecules in the first portion 111 of the second polarizer 102.

[0073] Example 2

[0074] Figure 4 This is a cross-sectional schematic diagram of a polarizer provided in Embodiment 2 of this application. (Refer to...) Figure 4 As shown, in a first aspect, Embodiment 2 of this application provides a polarizer 10, the polarizer 10 comprising a dihedral material 12 and a substrate 11 with an integral structure; wherein, the substrate 11 with the integral structure comprises lyotropic liquid crystal molecules, the portion of the substrate 11 in which the dihedral material 12 is dispersed is a first portion 111, the portion of the substrate 11 in which the dihedral material 12 is not dispersed is a second portion 112, the first portion 111 being located on one side of the second portion 112; wherein, the polarizer 10 has a polarizing portion M1 and a compensating portion M2, the first portion 111 and the dihedral material 12 constituting the polarizing portion M1, and the second portion 112 constituting the compensating portion M2.

[0075] It should be noted that the polarizer 10 provided in Embodiment 2 of this application has a similar structure to the polarizer 10 provided in Embodiment 1 of this application, and the same parts will not be described again in Embodiment 2 of this application.

[0076] The polarizer 10 provided in Embodiment 2 of this application further includes a substrate 14, the compensation part M2 is disposed on the surface of the substrate 14, and the polarizer M1 is disposed on the side of the compensation part M2 away from the substrate 14.

[0077] In the polarizer 10 provided in this embodiment, the substrate 14 can serve as a carrier film layer for the compensation portion M2, facilitating the coating of the lyotropic liquid crystal layer composed of the second portion 112 and the first portion 111. Additionally, the substrate 14 can protect the side of the compensation portion M2 facing away from the polarizer M1. Furthermore, since the polarizer 10 itself includes the substrate 14 as a carrier film layer, the polarizer 10 can be fabricated independently of the array substrate 21 or the color filter substrate 22, thus improving the application range and design freedom of the polarizer 10.

[0078] Figure 5 This is a cross-sectional schematic diagram of the display panel provided in Embodiment 2 of this application. (Refer to...) Figure 5 As shown, Embodiment 2 of this application provides a display panel, which includes at least one polarizer 10 as described in any of the above claims. The display panel also includes an array substrate 21, a color filter substrate 22, and a liquid crystal layer 23 disposed between the array substrate 21 and the color filter substrate 22. The liquid crystal molecules in the liquid crystal layer 23 have birefringence characteristics. The at least one polarizer 10 includes: a first polarizer 101 disposed on the side of the array substrate 21 away from the liquid crystal layer 23, wherein the polarizing portion M1 in the first polarizer 101 is disposed on the side of the compensation portion M2 away from the array substrate 21; and / or, a second polarizer 102 disposed on the side of the color filter substrate 22 away from the liquid crystal layer 23, wherein the polarizing portion M1 in the second polarizer 102 is disposed on the side of the compensation portion M2 away from the color filter substrate 22.

[0079] It should be noted that the display panel provided in Embodiment 2 of this application has a similar structure to the display panel provided in Embodiment 1 of this application, and the same parts will not be described again in Embodiment 2 of this application.

[0080] In some embodiments of this application, the first polarizer 101 further includes a first substrate 141, which is disposed on the side of the array substrate 21 away from the liquid crystal layer 23, and the compensation portion M2 in the first polarizer 101 is disposed on the surface of the first substrate 141 away from the array substrate 21; the second polarizer 102 further includes a second substrate 142, which is disposed on the side of the color filter substrate 22 away from the liquid crystal layer 23, and the compensation portion M2 in the second polarizer 102 is disposed on the surface of the second substrate 142 away from the color filter substrate 22.

[0081] In some embodiments of this application, the first substrate 141 of the first polarizer 101 is bonded to the surface of the array substrate 21 on the side away from the liquid crystal layer 23 by optical adhesive, and the second substrate 142 of the second polarizer 102 is bonded to the surface of the color filter substrate 22 on the side away from the liquid crystal layer 23 by optical adhesive.

[0082] Thirdly, Embodiment 2 of this application also provides a method for preparing a polarizer 10, used to prepare the polarizer 10 described in any of the above claims. (Refer to...) Figures 3-5 As shown, the preparation method of the polarizer 10 includes the following steps: step S01 and step S02.

[0083] Step S01 includes providing a carrier film layer and directionally coating a substrate 11 to form an integral structure on the carrier film layer. The integral structure substrate 11 includes lyotropic liquid crystal molecules.

[0084] Step S02 includes: coating a bidirectional material 12 on the surface of the substrate 11 of the integral structure, and controlling the dispersion time of the bidirectional material 12 so that the bidirectional material 12 is dispersed in the first part 111 of the substrate 11, and the bidirectional material 12 is not dispersed in the second part 112 of the substrate 11.

[0085] The first part 111 is located on one side of the second part 112. The polarizer has a polarizing part M1 and a compensation part M2. The first part 111 and the dihedral material 12 constitute the polarizing part M1, and the second part 112 is the compensation part M2.

[0086] In some embodiments of this application, the carrier film layer is the first substrate 141 or the second substrate 142.

[0087] In some embodiments of this application, the dihedral material 12 includes iodide ions and iodide ion complexes, the sum of the thicknesses of the second portion 112 and the first portion 111 is greater than or equal to 15 μm, and the dispersion time of the dihedral material 12 is 20-100 seconds.

[0088] In some embodiments of this application, the thickness of the first portion 111 is greater than or equal to 7 μm, and the thickness of the second portion 112 is greater than or equal to 0.5 μm.

[0089] In some embodiments of this application, the coating direction of the lyotropic liquid crystal layer is the same as the light absorption axis direction of the polarizing portion M1. Further, during the fabrication of the first polarizer 101 and the second polarizer 102, the arrangement direction of the lyotropic liquid crystal molecules in the second portion 112 of the first polarizer 101 is perpendicular to the arrangement direction of the lyotropic liquid crystal molecules in the second portion 112 of the second polarizer 102; the arrangement direction of the lyotropic liquid crystal molecules in the first portion 111 of the first polarizer 101 is perpendicular to the arrangement direction of the lyotropic liquid crystal molecules in the first portion 111 of the second polarizer 102.

[0090] In summary, this application provides a polarizer and its preparation method, as well as a display panel. The polarizer includes a dihedral material and a substrate with an integral structure. The substrate with the integral structure includes lyotropic liquid crystal molecules. The portion of the substrate in which the dihedral material is dispersed is a first portion, and the portion of the substrate in which the dihedral material is not dispersed is a second portion. The first portion is located on one side of the second portion. The polarizer has a polarizing portion and a compensating portion. The first portion and the dihedral material constitute the polarizing portion, and the second portion is the compensating portion. In the polarizer provided in this application embodiment, since the substrate includes lyotropic liquid crystal molecules, the substrate itself can have a compensation function, thereby forming a compensation portion in the second part of the substrate where the dihedral material is not dispersed. Since the dihedral material is dispersed in the first part of the substrate, a polarizing portion can be formed through the first part and the dihedral material. Furthermore, since the polarizing portion corresponds to the first part of the substrate and the compensation portion corresponds to the second part of the substrate, and the first part and the second part are an integral structure, the problem of complex polarizer fabrication process and thicker thickness caused by the need for separate film formation of the polarizing portion and the compensation portion can be effectively avoided, simplifying the complex polarizer fabrication process and reducing the thickness of the polarizer.

[0091] The above provides a detailed description of a polarizer and its preparation method, as well as a display panel, provided by the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A polarizing sheet, characterized by, The polarizer comprises a dihedral material and a substrate with an integral structure; The substrate of the integrated structure includes lyotropic liquid crystal molecules. The portion of the substrate in which the dihedral material is dispersed is the first portion, and the portion of the substrate in which the dihedral material is not dispersed is the second portion. The first portion is located on one side of the second portion. The polarizer has a polarizing section and a compensation section. The first section and the dihedral material constitute the polarizing section, and the second section is the compensation section. The lyotropic liquid crystal molecules in the second section are arranged in the same direction as the lyotropic liquid crystal molecules in the first section.

2. The polarizing sheet according to claim 1, wherein The dihedral material includes iodide ions and iodide ion complexes.

3. The polarizing sheet according to claim 2, wherein The combined thickness of the second part and the first part is greater than or equal to 15 μm.

4. The polarizing sheet according to claim 3, wherein The thickness of the first part is greater than or equal to 7 μm, and the thickness of the second part is greater than or equal to 0.5 μm.

5. The polarizer according to claim 1, characterized in that, The polarizer includes a support layer disposed on the side of the polarizer opposite to the compensation section.

6. A display panel, characterized in that, The display panel includes at least one polarizer as described in any one of claims 1-5, and further includes an array substrate, a color filter substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate, wherein the liquid crystal molecules in the liquid crystal layer have birefringence properties. Wherein, at least one of the polarizers comprises: A first polarizer is disposed on the side of the array substrate away from the liquid crystal layer, and the polarizing portion of the first polarizer is disposed on the side of the compensation portion away from the array substrate. And / or, a second polarizer is disposed on the side of the color filter substrate opposite to the liquid crystal layer, wherein the polarizing portion of the second polarizer is disposed on the side of the compensation portion opposite to the color filter substrate.

7. The display panel according to claim 6, characterized in that, The display panel includes a first polarizer and a second polarizer. The slow axis direction of the compensation portion in the first polarizer is perpendicular to the slow axis direction of the compensation portion in the second polarizer. The fast axis direction of the compensation portion in the first polarizer is perpendicular to the fast axis direction of the compensation portion in the second polarizer. The light transmission axis direction of the polarizing portion in the first polarizer is perpendicular to the light transmission axis direction of the polarizing portion in the second polarizer.

8. The display panel according to claim 7, characterized in that, The compensation portion in the first polarizer is disposed on the surface of the array substrate facing away from the liquid crystal layer, and the compensation portion in the second polarizer is disposed on the surface of the color filter substrate facing away from the liquid crystal layer.

9. The display panel according to claim 7, characterized in that, The first polarizer further includes a first substrate, which is disposed on the side of the array substrate away from the liquid crystal layer, and the compensation portion in the first polarizer is disposed on the surface of the first substrate on the side away from the array substrate. The second polarizer further includes a second substrate, which is disposed on the side of the color filter substrate away from the liquid crystal layer, and the compensation portion in the second polarizer is disposed on the surface of the second substrate on the side away from the color filter substrate.

10. A method for preparing a polarizer, characterized in that, Includes the following steps: A carrier film layer is provided, and a substrate with an integral structure is orientedly coated on the carrier film layer, the substrate with the integral structure comprising lyotropic liquid crystal molecules; A bidirectional material is coated on the surface of the substrate of the integrated structure, and the dispersion time of the bidirectional material is controlled so that the bidirectional material is dispersed in the first part of the substrate and the bidirectional material is not dispersed in the second part of the substrate. The first part is located on one side of the second part. The polarizer has a polarizing part and a compensating part. The first part and the dihedral material constitute the polarizing part. The second part is the compensating part. The lyotropic liquid crystal molecules in the second part are arranged in the same direction as the lyotropic liquid crystal molecules in the first part.

11. The method for preparing a polarizer according to claim 10, characterized in that, The dihedral material includes iodide ions and iodide ion complexes, the sum of the thicknesses of the second part and the first part is greater than or equal to 15 μm, and the dispersion time of the dihedral material is 20-100 seconds.

12. The method for preparing a polarizer according to claim 11, characterized in that, The thickness of the first part is greater than or equal to 7 μm, and the thickness of the second part is greater than or equal to 0.5 μm.

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