Optical film, polarizer and display device

Abstract

The embodiments of the present application disclose optical films, polarizers, and display devices, in which the regulating particles include first type regulating particles and / or second type regulating particles, the aspect ratio of the first type regulating particles is 5 or more and 50 or less, and the aspect ratio of the second type regulating particles is 1 or more and less than 5, and the first type regulating particles and / or the second type regulating particles are dispersed in a dispersed portion of a substrate, and the ratio of the thickness of the dispersed portion to the thickness of the substrate is 1:100 or more and less than 1:1.

Description

[Technical Field]

[0001] This application relates to the field of displays, and in particular to optical films, polarizers and display devices. [Background technology]

[0002] Currently, polarizers generally have a polarizing layer, and an optical film is used as a protective layer for the polarizing layer to protect the polarizing layer. To enhance the optical effect of the optical film, particles are usually dispersed throughout the optical film. However, to achieve the optical film's protective effect on the polarizing layer, the optical film must be thick, making it difficult to match the particle distribution thickness to achieve a better optical improvement effect. As a result, the display quality of the display device still has room for improvement.

[0003] Therefore, there is an urgent need for optical films, polarizers and displays that can solve the above technical problems. Summary of the Invention

[0004] The present application provides an optical film, a polarizer, and a display device that can alleviate the current technical problem that the display quality of display devices still needs to be improved due to the mismatch between the thickness of the optical film and the distribution thickness of particles for achieving better optical improvement effects.

[0005] The present application provides an optical film, the optical film including a substrate and regulating particles, the substrate includes a dispersion portion, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is 1:100 or more and less than 1:1; The regulatory particles are dispersed in the dispersion portion, and the regulatory particles include a first type of regulatory particles and / or a second type of regulatory particles; The first type of regulating particle has a plurality of first cross sections, each of which has one first circumscribing circle, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 5 or more, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 50 or less; The second type of regulating particle has a plurality of second cross sections, each of which has one second circumscribing circle, and the ratio of the length of the major axis of the second type of regulating particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is 1 or more, and the ratio of the length of the major axis of the second type of regulating particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is less than 5.

[0006] The present application further provides a polarizer comprising a polarizing layer and an optical film, wherein the polarizing layer is disposed on one side of the optical film, and a second surface of the optical film is located on the opposite side of the first surface of the optical film from the polarizing layer; The optical film includes a substrate and regulating particles, the substrate includes a dispersion portion, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is 1:100 or more and less than 1:1; The regulatory particles are dispersed in the dispersion portion, and the regulatory particles include a first type of regulatory particles and / or a second type of regulatory particles; The first type of regulating particle has a plurality of first cross sections, each of which has one first circumscribing circle, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 5 or more, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 50 or less; The second type of regulating particle has a plurality of second cross sections, each of which has one second circumscribing circle, and the ratio of the length of the major axis of the second type of regulating particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is 1 or more, and the ratio of the length of the major axis of the second type of regulating particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is less than 5.

[0007] The present application further provides a display device including a polarizer, the polarizer including a polarizing layer and an optical film, the polarizing layer being disposed on one side of the optical film, and a second surface of the optical film being located on an opposite side of the first surface of the optical film from the polarizing layer; The optical film includes a substrate and regulating particles, the substrate includes a dispersion portion, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is 1:100 or more and less than 1:1; The regulatory particles are dispersed in the dispersion portion, and the regulatory particles include a first type of regulatory particles and / or a second type of regulatory particles; The first type of regulating particle has a plurality of first cross sections, each of which has one first circumscribing circle, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 5 or more, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 50 or less; The second type of regulating particle has a plurality of second cross sections, each of which has one second circumscribing circle, and the ratio of the length of the major axis of the second type of regulating particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is 1 or more, and the ratio of the length of the major axis of the second type of regulating particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is less than 5. [Brief explanation of the drawings]

[0008] In order to more clearly describe the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. Those skilled in the art can obtain other drawings based on these drawings without any creative efforts.

[0009] [Figure 1] 1 is a first schematic structural diagram of an optical film provided in an embodiment of the present application; [Figure 2] FIG. 2 is a second schematic structural diagram of the optical film provided in the examples of the present application. [Figure 3] FIG. 3 is a third schematic structural diagram of the optical film provided in the examples of the present application. [Figure 4] FIG. 4 is a fourth schematic structural diagram of the optical film provided in the examples of the present application. [Figure 5] FIG. 5 is a fifth schematic structural diagram of the optical film provided in the examples of the present application. [Figure 6] FIG. 6 is a schematic structural diagram of the optical film provided in the examples of the present application. [Figure 7] FIG. 1 is a first schematic structural diagram of a polarizer provided in an embodiment of the present application. [Figure 8] FIG. 2 is a second schematic structural diagram of a polarizer provided in an embodiment of the present application. [Figure 9] FIG. 3 is a third schematic structural diagram of a polarizer provided in an embodiment of the present application. [Figure 10] FIG. 4 is a fourth schematic structural diagram of a polarizer provided in an embodiment of the present application. [Figure 11] 1 is a schematic structural diagram of a display device provided in an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0010] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts are included in the scope of protection of the present application. Furthermore, it should be understood that the specific embodiments described herein are only used to explain and interpret the present application, and are not intended to limit the present application. In this application, unless otherwise specified, terms indicating directions such as "upper" and "lower" usually refer to the upper and lower positions of the device in actual use or working state, specifically the direction of the drawing. Meanwhile, "inner" and "outer" refer to the contour of the device.

[0011] Currently, the optical film used as a protective layer for the polarizing layer is thick, making it difficult to match the thickness distribution of the particles dispersed throughout the optical film to achieve a better optical improvement effect, and as a result, there is still room for improvement in the display quality of the display device.

[0012] 1 to 4, an embodiment of the present application provides an optical film 101, which includes a substrate 1011 and regulating particles 1012; The substrate 1011 includes a dispersion portion 1011a, and the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is 1:100 or more and less than 1:1; The regulatory particles 1012 are dispersed in the dispersion portion 1011a, and the regulatory particles 1012 include first type regulatory particles 1012a and / or second type regulatory particles 1012b; The first type of regulating particle 1012a has a plurality of first cross sections, each of which has one first circumscribing circle, and the ratio of the length of the major axis of the first type of regulating particle 1012a to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 5 or more, and the ratio of the length of the major axis of the first type of regulating particle 1012a to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 50 or less; The second type regulating particle 1012b has a plurality of second cross sections, each of which has one second circumscribing circle, and the ratio of the length of the major axis of the second type regulating particle 1012b to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is 1 or more, and the ratio of the length of the major axis of the second type regulating particle 1012b to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is less than 5.

[0013] In the embodiment of the present application, regulating particles 1012 are added to the substrate 1011 of the optical film 101, and at least one of the first type of regulating particles 1012a and the second type of regulating particles 1012b is dispersed in the dispersion portion 1011a, thereby obtaining a better optical improvement effect by the regulating particles 1012 and improving the display quality of the display device equipped with the optical film 101.

[0014] Preferably, the ratio of the thickness of the dispersion portion to the thickness of the substrate is 1:10 or more, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is 9:10 or less.

[0015] Preferably, the substrate includes a first surface and a second surface disposed opposite to each other along a thickness direction of the substrate, and a side of the dispersion portion closer to the first surface is parallel to the first surface, and a side of the dispersion portion closer to the second surface is parallel to or coincides with the second surface, Here, the ratio of the thickness of the dispersion portion to the thickness of the substrate is 1:4 or more, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is 1:2 or less.

[0016] Preferably, the first type of regulating particles are dispersed in the dispersion portion along the thickness direction of the substrate, and the long axis of the first type of regulating particles forms an acute angle with the plane on which the first surface of the substrate is located, the acute angle being greater than 0° and less than 40°.

[0017] Preferably, the regulatory particles include the second type of regulatory particles, and the second type of regulatory particles are also dispersed outside the dispersed portion.

[0018] Preferably, the first type of regulatory particles are selected from at least one of a first subtype of regulatory particles, a second subtype of regulatory particles, a third subtype of regulatory particles, a fourth subtype of regulatory particles, and a fifth subtype of regulatory particles having different shapes, and the second type of regulatory particles are selected from at least one of a sixth subtype of regulatory particles, a seventh subtype of regulatory particles, an eighth subtype of regulatory particles, a ninth subtype of regulatory particles, and a tenth subtype of regulatory particles having different shapes; wherein the change in diameter of the first circumscribed circle of the first cross section of the first subtype regulatory particle along the extension direction of the long axis of the first subtype regulatory particle is 0.3 microns or less; Along the direction of extension of the long axis of the second subtype regulatory particle, the change in diameter of the first circumscribing circle of the first cross-section located at the center of the second subtype regulatory particle is 1 micron or less, and along the direction away from the center of the second subtype regulatory particle, the diameter of the first circumscribing circle of the first cross-section located at the first end of the second subtype regulatory particle gradually decreases, and the change in diameter of the first circumscribing circle of the first cross-section located at the second end of the second subtype regulatory particle is 1 micron or less; Along the direction of extension of the long axis of the third subtype regulatory particle, the change in diameter of the first circumscribing circle of the first cross-section located at the center of the third subtype regulatory particle is 1 micron or less, and along the direction away from the center of the third subtype regulatory particle, the diameter of the first circumscribing circle of the first cross-section located at the first end of the third subtype regulatory particle gradually decreases, and the diameter of the first circumscribing circle of the first cross-section located at the second end of the third subtype regulatory particle gradually decreases; a first end of the fourth subtype regulatory particle is connected to a second end of the fourth subtype regulatory particle, and a diameter of a first circumscribing circle of the first cross section of the fourth subtype regulatory particle gradually decreases along a direction from the first end of the fourth subtype regulatory particle to the second end of the fourth subtype regulatory particle; a first end of the fifth subtype regulatory particle is connected to a second end of the fifth subtype regulatory particle, and a diameter of a first circumscribing circle of the first cross section located at the first end of the fifth subtype regulatory particle gradually decreases along a direction away from the second end of the fifth subtype regulatory particle; and a diameter of a first circumscribing circle of the first cross section located at the second end of the fifth subtype regulatory particle gradually decreases along a direction away from the first end of the fifth subtype regulatory particle; The diameter of the second circumscribing circle of the second cross section of the sixth subtype regulatory particle varies by 0.3 microns or less along the longitudinal axis of the sixth subtype regulatory particle; a first end of the seventh subtype regulatory particle is connected to a second end of the seventh subtype regulatory particle, and a diameter of a second circumscribing circle of the second cross section located at the first end of the seventh subtype regulatory particle gradually decreases along a direction away from the second end of the seventh subtype regulatory particle; and a diameter of a second circumscribing circle of the second cross section located at the second end of the seventh subtype regulatory particle gradually decreases along a direction away from the first end of the seventh subtype regulatory particle; Along the direction of extension of the long axis of the eighth subtype regulatory particle, the change in diameter of the second circumscribing circle of the second cross section located at the center of the eighth subtype regulatory particle is 1 micron or less, and along the direction away from the center of the eighth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the eighth subtype regulatory particle gradually decreases, and the change in diameter of the second circumscribing circle of the second cross section located at the second end of the eighth subtype regulatory particle is 1 micron or less; Along the direction of extension of the long axis of the ninth subtype regulatory particle, the change in diameter of the second circumscribing circle of the second cross section located at the center of the ninth subtype regulatory particle is 1 micron or less, and along the direction away from the center of the ninth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the ninth subtype regulatory particle gradually decreases, and the diameter of the second circumscribing circle of the second cross section located at the second end of the ninth subtype regulatory particle gradually decreases; The first end of the 10th subtype regulatory particle is connected to the second end of the 10th subtype regulatory particle, and the diameter of the second circumscribing circle of the second cross section of the 10th subtype regulatory particle gradually decreases along the direction from the first end of the 10th subtype regulatory particle to the second end of the 10th subtype regulatory particle.

[0019] Preferably, the regulating particles include the first type of regulating particles and the second type of regulating particles, and the mass fraction of the first type of regulating particles in the regulating particles is less than 50%, and the mass fraction of the second type of regulating particles in the regulating particles is greater than 50%.

[0020] Preferably, the mass fraction of the regulating particles in the substrate is 0.0001% or more and 5% or less, and the tensile strength of the optical film is 30 MPa or more and 150 MPa or less.

[0021] Preferably, the substrate comprises a first sublayer, a second sublayer, and a third sublayer stacked together, the first sublayer and the third sublayer being located on opposing sides of the second sublayer, and the dispersion portion being located in at least one of the first sublayer, the second sublayer, and the third sublayer.

[0022] Preferably, the dispersion is located in the first sub-layer and / or the third sub-layer.

[0023] Preferably, the dispersion is located on the side of the first sub-layer facing away from the second sub-layer, and / or the dispersion is located on the side of the third sub-layer facing away from the second sub-layer.

[0024] Preferably, the tensile strength of the first sub-layer is greater than the tensile strength of the second sub-layer, and the tensile strength of the third sub-layer is greater than the tensile strength of the second sub-layer.

[0025] Preferably, the transmittance of the second sub-layer is greater than the transmittance of the first sub-layer, and the transmittance of the second sub-layer is greater than the transmittance of the third sub-layer.

[0026] Preferably, the optical film has a breaking elongation of 1% or more and 300% or less.

[0027] Preferably, the optical film has a breaking strength of 50 N / mm or more and 500 N / mm or less, and a heat shrinkage rate of less than 2%.

[0028] Next, the technical solutions of the present application will be described with reference to specific embodiments.

[0029] 1 to 4, in this embodiment, the first type of adjusting particles 1012a and / or the second type of adjusting particles 1012b are dispersed in the dispersion portion 1011a of the substrate 1011. When at least one of the first type of adjusting particles 1012a and the second type of adjusting particles 1012b is dispersed in the dispersion portion 1011a, the distribution range of the first type of adjusting particles 1012a in the substrate 1011 is only the dispersion portion 1011a, i.e., the distribution range of the first type of adjusting particles 1012a in the substrate 1011 forms the dispersion portion 1011a of the substrate 1011, or the distribution range of the second type of adjusting particles 1012b in the substrate 1011 is only the dispersion portion 1011a. 1a, i.e., the distribution range of the second type regulating particles 1012b in the substrate 1011 forms the dispersed portion 1011a of the substrate 1011, or the distribution range of the first type regulating particles 1012a and the second type regulating particles 1012b in the substrate 1011 is only the dispersed portion 1011a, i.e., the distribution range of the first type regulating particles 1012a and the second type regulating particles 1012b in the substrate 1011 forms the dispersed portion 1011a of the substrate 1011.

[0030] In some embodiments, the substrate 1011 includes a first surface and a second surface disposed opposite each other along a thickness direction of the substrate 1011. The dispersion portion 1011a includes a first side surface and a second side surface disposed opposite each other in a thickness direction of the substrate 1011, and the first side surface is located on a side of the second side surface closer to the first surface. The thickness of the dispersion portion 1011a is the maximum value of the distance between the first side surface and the second side surface of the dispersion portion 1011a, and the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is 1:100 or more and less than 1:1. In other words, the ratio of the maximum value of the distance between the first side surface and the second side surface of the dispersion portion 1011a, which is the thickness of the dispersion portion 1011a, to the thickness of the substrate 1011 is 1:100 or more and less than 1:1.

[0031] In some embodiments, when the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is 1:100 or more, and the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is less than 1:1, along the thickness direction of the substrate 1011, the dispersion portion 1011a overlaps with areas in the substrate 1011 where the thickness ratio is 1% or more, and the dispersion portion 1011a overlaps with areas in the substrate 1011 where the thickness ratio is less than 100%.

[0032] In some embodiments, the thickness distribution of the dispersion portion 1011a is uniform, i.e., the difference between the maximum and minimum values ​​of the distance between the side of the dispersion portion 1011a closer to the first surface and the side of the dispersion portion 1011a closer to the second surface does not exceed 5% of the average value of the two. Furthermore, the side of the dispersion portion closer to the first surface is parallel to the first surface, and the side of the dispersion portion closer to the second surface is parallel to or coincident with the second surface, i.e., the maximum and minimum values ​​of the distance between the side of the dispersion portion 1011a closer to the first surface and the side of the dispersion portion 1011a closer to the second surface are equal.

[0033] In some embodiments, the dispersing portion 1011a is disposed close to the first surface, or the dispersing portion 1011a is disposed close to the second surface. When the dispersing portion 1011a is disposed close to the first surface, the minimum distance between the first side surface and the first surface in the thickness direction of the substrate 1011 is smaller than the minimum distance between the second side surface and the second surface. When the dispersing portion 1011a is disposed close to the second surface, the minimum distance between the first side surface and the first surface in the thickness direction of the substrate 1011 is larger than the minimum distance between the second side surface and the second surface.

[0034] In some embodiments, when the dispersion portion 1011a is disposed adjacent to the first surface, the first side is flush with the first surface, preferably the first side coincides with the first surface. When the dispersion portion 1011a is disposed adjacent to the second surface, the second side is flush with the second surface, preferably the second side coincides with the second surface.

[0035] In some embodiments, the plane in which the first surface lies is parallel to the plane in which the second surface lies, the first side is parallel to the first surface, and the second side is parallel to the second surface.

[0036] In some embodiments, when the first side surface and the first surface are not coplanar, the first side surface contacts the closest one of the modulator particles 1012 dispersed only in the dispersed portion 1011a. For example, the first type modulator particle 1012a is dispersed only in the dispersed portion 1011a, and the first side surface contacts the first type modulator particle 1012a closest to the first side surface. The second type modulator particle 1012b is dispersed only in the dispersed portion 1011a, and the first side surface contacts the second type modulator particle 1012b closest to the first side surface. The first type modulator particle 1012a and the second type modulator particle 1012b are dispersed only in the dispersed portion 1011a, and the first side surface contacts the first type modulator particle 1012a or the second type modulator particle 1012b closest to the first side surface.

[0037] In some embodiments, when the second side surface and the second surface are not coplanar, the second side surface contacts the modulator particle 1012 closest to the second side surface among the modulator particles 1012 dispersed only in the dispersed portion 1011a. For example, the first type modulator particle 1012a is dispersed only in the dispersed portion 1011a, and the second side surface contacts the first type modulator particle 1012a closest to the second side surface. The second type modulator particle 1012b is dispersed only in the dispersed portion 1011a, and the second side surface contacts the second type modulator particle 1012b closest to the second side surface. The first type modulator particle 1012a and the second type modulator particle 1012b are dispersed only in the dispersed portion 1011a, and the second side surface contacts the first type modulator particle 1012a or the second type modulator particle 1012b closest to the second side surface.

[0038] In some embodiments, when the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is 1:100 or more, and the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is less than 1:1, the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 may be 1.5:100, 1:50, 1:40, 1:30, 1:20, 1:10, 1:8, 1:6, 1:5, 1:4, 1:2, 1:3, 3:5, 2:3, 3:4, 4:5, 5:6, 7:8, 9:10, 19:20, 29:30, 39:40, 49:50, etc. Preferably, the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is 1:10 or more, and the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is 9:10 or less, which is advantageous in that the adjustment particles 1012 dispersed only in the dispersion portion 1011a can be closer to a distribution thickness that provides a higher optical improvement effect, thereby improving the optical improvement effect (contrast, chromaticity viewing angle, etc.) of the optical film 101 and improving the display quality of a display device equipped with the optical film 101. More preferably, the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is 1:4 or more, and the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is 1:2 or less, which is advantageous in bringing the control particles 1012 dispersed only in the dispersion portion 1011a closer to a distribution thickness that has a higher optical improvement effect, thereby improving the optical improvement effect (contrast, chromaticity viewing angle, etc.) of the optical film 101 and improving the display quality of a display device equipped with the optical film 101.

[0039] In some embodiments, the optical film 101 is formed by a multi-layer coextrusion process, where the optical film 101 is formed by coextrusion and compounding of multiple optical sublayers on the same production line. Correspondingly, the substrate 1011 is formed by coextrusion and compounding of multiple substrate sublayers. In forming the optical film 101, the first type of regulating particles 1012a and / or the second type of regulating particles 1012b are dispersed in one or more substrate sublayers (e.g., if the total number of substrate sublayers of the substrate 1011 is M, where M is an integer greater than or equal to 2, the first type of regulating particles 1012a and / or the second type of regulating particles 1012b can be dispersed in substrate sublayers with a number less than M), so that the first type of regulating particles 1012a and / or the second type of regulating particles 1012b in the optical film 101 are dispersed in one or more substrate sublayers (e.g., if the total number of substrate sublayers of the substrate 1011 is M, where M is an integer greater than or equal to 2, the first type of regulating particles 1012a and / or the second type of regulating particles 1012b can be dispersed in substrate sublayers with a number less than M). The distribution thickness of the first type regulating particles 1012a and / or the second type regulating particles 1012b is smaller than the thickness of the optical film 101, and the substrate sub-layer in which the first type regulating particles 1012a and / or the second type regulating particles 1012b are dispersed forms the dispersion portion 1011a, which is advantageous for simplifying the manufacturing process, and at the same time, the regulating particles 1012 can better improve the optical performance of the optical film 101 and improve the display quality of the display device equipped with the optical film 101. For example, the substrate 1011 may be formed by co-extrusion and compounding three substrate sub-layers, which may be an upper substrate sub-layer, a middle substrate sub-layer, and a lower substrate sub-layer, respectively, and the first type of regulating particles 1012a may be dispersed in the upper substrate sub-layer or the lower substrate sub-layer, and the upper substrate sub-layer, the middle substrate sub-layer, and the lower substrate sub-layer may be co-extruded and compounded to form the optical film 101, in which the upper substrate sub-layer or the lower substrate sub-layer forms the dispersed portion 1011a. When the optical film 101 is applied to a display device, the optical film 101 may be located on a light-emitting side of a display panel of the display device, the upper substrate sub-layer may be located on a side of the middle substrate sub-layer away from the display panel, and the lower substrate sub-layer may be located on a side of the middle substrate sub-layer close to the display panel.

[0040] For example, referring to FIG. 5, the substrate 1011 includes a stacked first sublayer 112, a second sublayer 113, and a third sublayer 114, the first sublayer 112 and the third sublayer 114 being located on opposing sides of the second sublayer 113, and the dispersion portion 1011a being located in at least one of the first sublayer 112, the second sublayer 113, and the third sublayer 114.

[0041] More preferably, the dispersed portions 1011a are located in the first sub-layer 112 and / or the third sub-layer 114. Here, the first sub-layer 112 and the third sub-layer 114 can be considered as surface layers of the substrate 1011, and the second sub-layer 113 can be considered as a core layer of the substrate 1011. In this embodiment, the dispersed portions 1011a are provided in the surface layers of the optical film 10 and are not distributed in the core layer of the optical film 10. During the stretching process of the film layer, breakage of the film layer occurs preferentially in the surface layer, so in this embodiment, disposing the regulating particles 1012 in the surface layer further helps to improve the tensile strength of the film layer.

[0042] 6 , in some embodiments, the dispersed portions 1011 a are located on a side of the first sublayer 112 away from the second sublayer 113, and / or the dispersed portions 1011 a are located on a side of the third sublayer 114 away from the second sublayer 113. That is, the diffusing particles 1012 may be distributed on a surface of the first sublayer 112 away from the second sublayer 113, or the diffusing particles 1012 may be distributed on a surface of the third sublayer 114 away from the second sublayer 113, or the diffusing particles 1012 may be distributed on both a surface of the first sublayer 112 away from the second sublayer 113 and a surface of the third sublayer 114 away from the second sublayer 113. In some embodiments, the diffusing particles 1012 are dispersed on the outer surface of the optical film 10, which can improve the tensile strength of the film layer.

[0043] Referring to Figure 5 or Figure 6, in the embodiment of the present application, the tensile strength and optical improvement effect of the optical film 10 can be improved by differentiating the properties of the laminated first sub-layer 112, the second sub-layer 113, and the third sub-layer 114.

[0044] In some embodiments, the tensile strength of the first sublayer 112 is greater than the tensile strength of the second sublayer 113, and the tensile strength of the third sublayer 114 is greater than the tensile strength of the second sublayer 113. During the stretching process of a film layer, breakage of the film layer occurs preferentially in the surface layer. Therefore, in the embodiments of the present application, increasing the tensile strength of the first sublayer 112 and the third sublayer 114, which are located in the surface layer, is advantageous for improving the tensile strength of the optical film 101.

[0045] In some embodiments, the transmittance of the second sublayer 113 is greater than the transmittance of the first sublayer 112, and the transmittance of the second sublayer 113 is greater than the transmittance of the third sublayer 114. By increasing the transmittance of the second sublayer 113, embodiments of the present application can compensate for the loss of transmittance of the first sublayer 112 and the third sublayer 114 due to the incorporation of the modulating particles 1012.

[0046] In some embodiments, the first type of regulating particles 1012a are dispersed in the dispersion portion 1011a, and the long axis of the first type of regulating particles 1012a forms an acute angle with the plane on which the first surface is located, the acute angle being greater than 0° and being less than 40°, for example, 1°, 2°, 5°, 8°, 10°, 12°, 15°, 18°, 20°, 25°, 28°, 30°, 35°, 38°, etc. When the first-type regulating particles 1012a are dispersed in the dispersion portion 1011a, the distribution thickness of the first-type regulating particles 1012a decreases, making it easier to control the angle between the major axis of the first-type regulating particles 1012a and the plane on which the first surface is located, and also making it easier to adjust the acute angle between the major axis of the first-type regulating particles 1012a and the plane on which the first surface is located to 40° or less, thereby increasing the amount of light scattered by the first-type regulating particles 1012a in a direction parallel to the first surface and improving the chromaticity viewing angle and contrast of the optical film 101. The acute angle is greater than 0° and less than or equal to 20°, which is advantageous for further enhancing the improvement effect of the first-type regulating particles 1012a on the chromaticity viewing angle and contrast of the optical film 101.

[0047] In some embodiments, the dispersion portion 1011a includes a first dispersion subportion, and the first type of modulating particles 1012a are dispersed in the first dispersion subportion. If the first type of modulating particles 1012a are dispersed only in the dispersion portion 1011a and the modulating particles further include the second type of modulating particles 1012b, the dispersion portion 1011a further includes a second dispersion subportion, and the second type of modulating particles 1012b are dispersed only in the second dispersion subportion. In the thickness direction of the substrate 1011, the first dispersion subportion and the second dispersion subportion may overlap or coincide, or the first dispersion subportion and the second dispersion subportion may be separated.

[0048] In some embodiments, the side of the first dispersing sub-portion closer to the first surface is parallel to the plane in which the first surface lies, and the side of the first dispersing sub-portion closer to the second surface is parallel to or coincident with the plane in which the second surface lies.

[0049] In some embodiments, the side of the second dispersing sub-portion closer to the first surface is parallel to the plane in which the first surface lies, and the side of the second dispersing sub-portion closer to the second surface is parallel to or coincident with the plane in which the second surface lies.

[0050] In some embodiments, when the first type of modulating particles 1012a are dispersed in the dispersion portion 1011a and the modulating particles further include the second type of modulating particles 1012b, the second type of modulating particles 1012b can be dispersed outside the dispersion portion 1011a and distributed within the substrate 1011. In the thickness direction of the substrate 1011, the ratio of the distribution thickness of the second type of modulating particles 1012b in the substrate 1011 to the thickness of the substrate 1011 is greater than 1:100 and less than 1:1.

[0051] When the ratio of the distribution thickness of the second type of regulating particles 1012b in the substrate 1011 to the thickness of the substrate 1011 is 1:1, the second type of regulating particles 1012b are dispersed outside the dispersed portion 1011a, and the first dispersed sub-portion and the second dispersed sub-portion partially coincide.

[0052] In some embodiments, the adjusting particle 1012 has a major axis and a diameter, and the length of the major axis of the adjusting particle 1012 is the distance between the two end points of the major axis of the adjusting particle 1012. Each adjusting particle 1012 has multiple cross sections in an extension direction perpendicular to the major axis of the adjusting particle 1012, each cross section having one circumscribing circle, and the diameter of the adjusting particle 1012 corresponds to the diameter of the circumscribing circle with the largest diameter among the multiple cross sections. Here, the two most distant points in the cross section of the adjusting particle 1012 are located on the circumscribing circle of the cross section, and the distance between the two most distant points in the cross section is the diameter of the circumscribing circle.

[0053] In some embodiments, the modulation particles 1012 include first type modulation particles 1012a, which can reduce the rainbow pattern problem of the optical film 101 while also improving the chromaticity viewing angle and contrast of the optical film 101. The first-type regulatory particle 1012a has a plurality of first cross sections, each of which has a first circumscribing circle, and the ratio of the length of the major axis of the first-type regulatory particle 1012a to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 5 or greater, and the ratio of the length of the major axis of the first-type regulatory particle 1012a to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is less than 50, e.g., 10, 12, 15, 16, 18, 20, 30, 32, 34, 35, 36, 38, 40, 42, 45, 46, 48, etc., and the first cross sections are perpendicular to the extension direction of the major axis of the first-type regulatory particle 1012a. The diameter of the first circumscribing circle of one of the first cross sections of the first-type regulatory particle 1012a is the distance between the farthest two points within the first cross section. Using the first type of adjustment particles 1012a with a large aspect ratio (the ratio of the length of the major axis to the diameter of the first circumscribing circle with the largest diameter) makes it easier for more light to change its propagation direction through the adjustment particles 1012, which is advantageous in obtaining the improvement effect of the adjustment particles 1012 on chromaticity viewing angle and contrast.

[0054] In some embodiments, the first type of regulating particle 1012a is selected from at least one of a first subtype of regulating particle, a second subtype of regulating particle, a third subtype of regulating particle, a fourth subtype of regulating particle, and a fifth subtype of regulating particle having different shapes, wherein the change in diameter of the first circumscribed circle of the first cross section of the first subtype of regulating particle along the extension direction of the long axis of the first subtype of regulating particle is 0.3 microns or less, for example, 0 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. In some embodiments, along the extension direction of the long axis of the first subtype regulatory particle, the diameter of the first circumscribing circle of the first cross section located at the first end of the first subtype regulatory particle is the same as the diameter of the first circumscribing circle of the first cross section at the central portion of the first subtype regulatory particle, and the diameter of the first circumscribing circle located at the second end of the first subtype regulatory particle is the same as the diameter of the first circumscribing circle at the central portion of the first subtype regulatory particle.

[0055] In some embodiments, the first cross-section of the first subtype of regulatory particle may be a regular shape, such as a circle, oval, triangle, square, etc., or may be an irregular shape.

[0056] In some embodiments, the first subtype regulatory particles may be rod-shaped particles, and when the first subtype regulatory particles are rod-shaped, the first cross-section of the first subtype regulatory particles may be circular or elliptical. When the first cross-section of the first subtype regulatory particles is circular, the first circumscribing circle of the first cross-section of the first subtype regulatory particles may coincide with the first cross-section. When the first cross-section of the first subtype regulatory particles is elliptical, the diameter of the first circumscribing circle of each first cross-section of the first subtype regulatory particles is the length of the major axis of the ellipse formed by each first cross-section of the first subtype regulatory particles, and the ratio of the major axis of the ellipse formed by the first cross-section of one of the first subtype regulatory particles to the minor axis of the ellipse formed by one of the first cross-sections of the first subtype regulatory particles may be greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0057] Along the extension direction of the long axis of the second subtype regulatory particle, the change in diameter of the first circumscribed circle of the first cross section located in the central portion of the second subtype regulatory particle is 1 micron or less, and may be, for example, 0 microns, 0.95 microns, 0.8 microns, 0.78 microns, 0.75 microns, 0.72 microns, 0.7 microns, 0.68 microns, 0.65 microns, 0.62 microns, 0.6 microns, 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. Along a direction away from the center of the second subtype regulatory particle, the diameter of the first circumscribing circle of the first cross section located at the first end of the second subtype regulatory particle gradually decreases, and the change value of the diameter of the first circumscribing circle of the first cross section at the second end of the second subtype regulatory particle is 1 micron or less, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, 0.68 micron, 0.65 micron, 0.62 micron. The thickness may be 0.6 microns, 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc.In some embodiments, the diameter of the first circumscribing circle of the first cross-section located at the first end of the second subtype regulatory particle gradually decreases along a direction away from the central portion of the second subtype regulatory particle, and the diameter of the first circumscribing circle of the first cross-section located at the second end of the second subtype regulatory particle is the same as the diameter of the first circumscribing circle of the first cross-section located at the central portion of the second subtype regulatory particle.

[0058] The gradual decrease in diameter of the first circumscribing circle of the first cross section located at the first end of the second subtype regulating particle along the direction away from the central portion of the second subtype regulating particle means that the diameter of the first circumscribing circle of the first cross section located at the first end of the second subtype regulating particle shows a tendency to decrease in diameter in the direction away from the central portion of the second subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in diameter of the first circumscribing circle of the first cross section located at the first end of the second subtype regulating particle along the direction away from the central portion of the second subtype regulating particle.

[0059] In some embodiments, the first cross-section of the second subtype of regulatory particle may be a regular shape, such as a circle, oval, triangle, square, etc., or may be an irregular shape.

[0060] In some embodiments, the second subtype of regulatory particles may be needle-like particles with a reduced diameter at one end.

[0061] In some embodiments, when the second subtype regulatory particle is a needle-shaped particle with a reduced diameter at one end, the first cross section of the second subtype regulatory particle may be circular or elliptical, and when the first cross section located at the second end of the second subtype regulatory particle or the first cross section located at the central portion of the second subtype regulatory particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse of any of the first cross sections located at the second end or central portion of the second subtype regulatory particle is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The shape of the first cross section located at the first end of the second subtype regulatory particle is the same as the shape of the first cross section located at the central portion of the second subtype regulatory particle, and the area gradually decreases along the direction away from the central portion of the second subtype regulatory particle.

[0062] Along the extension direction of the long axis of the third subtype regulatory particle, the change in diameter of the first circumscribed circle of the first cross section located in the center of the third subtype regulatory particle is 1 micron or less, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, 0.68 micron, 0.65 micron, 0.62 micron, 0.6 micron, 0.58 micron, 0.55 micron, 0.52 micron, 0.5 micron, 0.48 micron, 0.45 micron, 0.42 micron, 0.4 micron, 0.38 micron, 0. The diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulatory particle may be 35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc., and the diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulatory particle gradually decreases along the direction away from the center of the third subtype regulatory particle, and the diameter of the first circumscribing circle of the first cross section located at the second end of the third subtype regulatory particle gradually decreases along the direction away from the center of the third subtype regulatory particle. In some embodiments, the diameter of the first circumscribing circle of the first cross section located at the center of the third subtype regulatory particle is uniform, and the diameters of the first circumscribing circle of the first cross section located at the first end of the third subtype regulatory particle and the second end of the third subtype regulatory particle gradually change along the extension direction of the major axis of the third subtype regulatory particle.

[0063] The gradual decrease in diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulating particle along the direction away from the central portion of the third subtype regulating particle means that the diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulating particle shows a tendency to decrease in diameter in the direction away from the central portion of the third subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulating particle in the direction away from the central portion of the third subtype regulating particle.

[0064] The gradual decrease in diameter of the first circumscribing circle of the first cross section located at the second end of the third subtype regulating particle along the direction away from the central portion of the third subtype regulating particle means that the diameter of the first circumscribing circle of the first cross section located at the second end of the third subtype regulating particle shows a tendency to decrease in diameter in the direction away from the central portion of the third subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in diameter of the first circumscribing circle of the first cross section located at the second end of the third subtype regulating particle along the direction away from the central portion of the third subtype regulating particle.

[0065] In some embodiments, the first cross-section of the third subtype of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, etc., or may be an irregular shape.

[0066] In some embodiments, the third subtype of regulatory particles may be needle-shaped particles with reduced diameters at both ends.

[0067] In some embodiments, when the third subtype regulatory particles are needle-shaped particles with reduced diameters at both ends, the shape of the first cross section of the third subtype regulatory particle may be circular or elliptical, and when the first cross section located at the center of the third subtype regulatory particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse formed by any of the first cross sections located at the center of the third subtype regulatory particle may be greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The shapes of the first cross sections located at the first end and second end of the third subtype regulatory particle are the same as the shape of the first cross section located at the center of the third subtype regulatory particle, and the area gradually decreases in a direction away from the center of the third subtype regulatory particle.

[0068] The first end of the fourth subtype regulating particle is connected to the second end of the fourth subtype regulating particle, and the diameter of the first circumscribing circle of the first cross section of the fourth subtype regulating particle gradually decreases along the direction from the first end of the fourth subtype regulating particle to the second end of the fourth subtype regulating particle.

[0069] The gradual decrease in diameter of the first circumscribing circle of the first cross section of the fourth subtype regulatory particle along the direction from the second end of the fourth subtype regulatory particle to the second end of the fourth subtype regulatory particle means that the diameter of the first circumscribing circle of the first cross section of the fourth subtype regulatory particle tends to decrease in the direction from the first end of the fourth subtype regulatory particle to the second end of the fourth subtype regulatory particle, and can be understood to include, but is not limited to, a sequential decrease in diameter of the first circumscribing circle of the first cross section of the fourth subtype regulatory particle in the direction from the first end of the fourth subtype regulatory particle to the second end of the fourth subtype regulatory particle.

[0070] In some embodiments, the first cross-section of the fourth subtype of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, etc., or may be an irregular shape.

[0071] In some embodiments, the fourth subtype of regulatory particles may be pyramidal particles.

[0072] In some embodiments, when the fourth subtype regulatory particle is a conical particle, the first cross-section of the fourth subtype regulatory particle is circular or elliptical. Along the direction from the first end of the fourth subtype regulatory particle to the second end of the fourth subtype regulatory particle, the shape of the first cross-section of the fourth subtype regulatory particle is constant, and its area gradually decreases. When the first cross-section of the fourth subtype regulatory particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse formed by any of the first cross-sections of the fourth subtype regulatory particle is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0073] The first end of the fifth subtype regulatory particle is connected to the second end of the fifth subtype regulatory particle, and the diameter of the first circumscribing circle of the first cross section located at the first end of the fifth subtype regulatory particle gradually decreases along the direction away from the second end of the fifth subtype regulatory particle, and the diameter of the first circumscribing circle of the first cross section located at the second end of the fifth subtype regulatory particle gradually decreases along the direction away from the first end of the fifth subtype regulatory particle.

[0074] The gradual decrease in diameter of the first circumscribing circle of the first cross section located at the first end of the fifth subtype regulating particle along the direction away from the second end of the fifth subtype regulating particle means that the diameter of the first circumscribing circle of the first cross section located at the first end of the fifth subtype regulating particle shows a tendency to decrease in diameter in the direction away from the second end of the fifth subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in diameter of the first circumscribing circle of the first cross section located at the first end of the fifth subtype regulating particle in the direction away from the second end of the fifth subtype regulating particle.

[0075] The gradual decrease in diameter of the first circumscribing circle of the first cross section located at the second end of the fifth subtype regulating particle along the direction away from the first end of the fifth subtype regulating particle means that the diameter of the first circumscribing circle of the first cross section located at the second end of the fifth subtype regulating particle shows a tendency to decrease in diameter in the direction away from the first end of the fifth subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in diameter of the first circumscribing circle of the first cross section located at the second end of the fifth subtype regulating particle in the direction away from the first end of the fifth subtype regulating particle.

[0076] In some embodiments, the first cross-section of the fifth subtype of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, or the like, or may be an irregular shape.

[0077] In some embodiments, the fifth subtype of regulatory particles may be bipyramidal particles and / or ellipsoidal particles.

[0078] In some embodiments, when the fifth subtype regulatory particles are bipyramidal and / or ellipsoidal particles, the first cross-section of the fifth subtype regulatory particles is circular or elliptical. Along a direction away from the second end of the fifth subtype regulatory particle, the shape of the first cross-section located at the first end of the fifth subtype regulatory particle is constant and its area gradually decreases. Along a direction away from the first end of the fifth subtype regulatory particle, the shape of the first cross-section located at the second end of the fifth subtype regulatory particle is constant and its area gradually decreases. When the fifth subtype regulatory particles have an elliptical first cross-section, the ratio of the major axis of the ellipse to the minor axis of the ellipse formed by any of the fifth subtype regulatory particles is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0079] The difference between the fifth subtype regulating particle being a bipyramidal particle and an ellipsoidal particle is that when the fifth subtype regulating particle is a bipyramidal particle, the cross section of the fifth subtype regulating particle in a direction parallel to the long axis of the fifth subtype regulating particle is a polygon such as a triangle or a rectangle, and when the fifth subtype regulating particle is an ellipsoidal particle, the cross section of the fifth subtype regulating particle in a direction parallel to the long axis of the fifth subtype regulating particle is an ellipse.

[0080] In some embodiments, the length of the major axis of the first-type regulating particles 1012a is 1 micron or more and 200 microns or less, for example, 5 microns, 10 microns, 50 microns, 60 microns, 70 microns, 80 microns, 90 microns, 100 microns, 120 microns, 150 microns, 180 microns, etc., which can effectively improve the chromaticity viewing angle of the optical film 101 while reducing the rainbow pattern problem of the optical film 101. Preferably, the length of the major axis of the first-type regulating particles 1012a is 40 microns or more and 100 microns or less, which can make the size of the first-type regulating particles 1012a more concentrated and further improve the overall optical performance of the optical film 101.

[0081] In some embodiments, the regulatory particles 1012 include a second type of regulatory particle 1012b.

[0082] In some embodiments, the second type regulating particle 1012b has a plurality of second cross sections, each of which has one second circumscribing circle, and the ratio of the length of the major axis of the second type regulating particle 1012b to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is 1 or more, and the ratio of the length of the major axis of the second type regulating particle 1012b to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is less than 5, for example, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.2, 2.5, 2.8, 3, 3.5, 4, 4.5, etc., and the second cross sections are perpendicular to the extension direction of the major axis of the first type regulating particle 1012a. By including the second type of regulating particles 1012b having a small aspect ratio (the ratio of the length of the major axis to the diameter of the second circumscribing circle with the largest diameter) in the regulating particles 1012, it is advantageous to effectively reduce the in-plane retardation value of the optical film 101 to 3000 nanometers or less, and to effectively reduce the difference between the in-plane retardation value of the optical film 101 and the retardation value in the thickness direction of the optical film 101, thereby improving the problem of rainbow patterns in the optical film 101 and improving the display quality of display devices equipped with the optical film 101.

[0083] In some embodiments, the second type of regulatory particle 1012b is selected from at least one of a sixth subtype regulatory particle, a seventh subtype regulatory particle, an eighth subtype regulatory particle, a ninth subtype regulatory particle, and a tenth subtype regulatory particle having a different shape.

[0084] Here, the change in diameter of the second circumscribing circle of the second cross section of the sixth subtype regulatory particle along the extension direction of the long axis of the sixth subtype regulatory particle is 0.3 microns or less, such as 0 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. In some embodiments, along the extension direction of the long axis of the sixth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at a first end of the sixth subtype regulatory particle is the same as the diameter of the second circumscribing circle of the second cross section located at a central portion of the sixth subtype regulatory particle, and the diameter of the second circumscribing circle of the second cross section located at a second end of the sixth subtype regulatory particle is the same as the diameter of the second circumscribing circle of the second cross section located at a central portion of the sixth subtype regulatory particle.

[0085] In some embodiments, the second cross-section of the sixth subtype of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, or the like, or may be an irregular shape.

[0086] In some embodiments, the sixth subtype regulatory particles are cubic particles or rectangular particles, the second cross section of the sixth subtype regulatory particles is square or rectangular, and the diameter of the second circumscribing circle of any of the second cross sections of the sixth subtype regulatory particles is the diagonal length of the square or rectangle formed by the second cross section.

[0087] It is more preferable that the ratio of the length of the major axis of the sixth subtype regulatory particle to the diameter of the second circumscribing circle with the largest diameter among the second circumscribing circles of the multiple second cross sections of the sixth subtype regulatory particle is close to 1, and may be, for example, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.2, 2.5, 3, etc.

[0088] The first end of the seventh subtype regulatory particle is connected to the second end of the seventh subtype regulatory particle, and the diameter of the second circumscribing circle of the second cross section located at the first end of the seventh subtype regulatory particle gradually decreases along the direction away from the second end of the seventh subtype regulatory particle, and the diameter of the second circumscribing circle of the second cross section located at the second end of the seventh subtype regulatory particle gradually decreases along the direction away from the first end of the seventh subtype regulatory particle.

[0089] The gradual decrease in diameter of the second circumscribing circle of the second cross section located at the first end of the seventh subtype regulatory particle along the direction away from the second end of the seventh subtype regulatory particle means that the diameter of the second circumscribing circle of the second cross section located at the first end of the seventh subtype regulatory particle shows a tendency to decrease in the direction away from the second end of the seventh subtype regulatory particle, and can be understood to include, but is not limited to, a sequential decrease in diameter of the second circumscribing circle of the second cross section located at the first end of the seventh subtype regulatory particle in the direction away from the second end of the seventh subtype regulatory particle.

[0090] The gradual decrease in diameter of the second circumscribing circle of the second cross section located at the second end of the seventh subtype regulatory particle along the direction away from the first end of the seventh subtype regulatory particle means that the diameter of the second circumscribing circle of the second cross section located at the second end of the seventh subtype regulatory particle shows a tendency to decrease in diameter in the direction away from the first end of the seventh subtype regulatory particle, and can be understood to include, but is not limited to, a sequential decrease in diameter of the second circumscribing circle of the second cross section located at the second end of the seventh subtype regulatory particle along the direction away from the first end of the seventh subtype regulatory particle.

[0091] In some embodiments, the second cross-section of the seventh subtype of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, or the like, or may be an irregular shape.

[0092] In some embodiments, the seventh subtype regulatory particle is a spherical particle or an ellipsoidal particle, and the second cross-section of the seventh subtype regulatory particle is circular or elliptical. If the second cross-section of the seventh subtype regulatory particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse formed by any of the second cross-sections of the seventh subtype regulatory particle is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. If the seventh subtype regulatory particle is a spherical particle, the second cross-section of any of the seventh subtype regulatory particles is circular, the second circumscribing circle of any of the second cross-sections coincides with the second cross-section, and the ratio of the major axis of the seventh subtype regulatory particle to the diameter of the second circumscribing circle with the largest diameter among the second cross-sections of the seventh subtype regulatory particle is 1.

[0093] It is preferable that the ratio of the length of the major axis of the seventh subtype regulating particle to the diameter of the second circumscribing circle with the largest diameter among the multiple second circumscribing circles of the seventh subtype regulating particle is close to 1, and if the seventh subtype regulating particle is an ellipsoidal particle, it is more preferable that its shape is an approximately spherical particle, i.e., the closer the length of the major axis of the seventh subtype regulating particle is to the diameter of the seventh subtype regulating particle, the more preferable. Preferably, the ratio of the length of the major axis of the seventh subtype regulatory particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles of the seventh subtype regulatory particle is 1 or more, and the ratio of the length of the major axis of the seventh subtype regulatory particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles of the seventh subtype regulatory particle is 3 or less; more preferably, the ratio of the length of the major axis of the seventh subtype regulatory particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles of the seventh subtype regulatory particle is 1 or more, and the ratio of the length of the major axis of the seventh subtype regulatory particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles of the seventh subtype regulatory particle is 1.5 or less.

[0094] The change in diameter of the second circumscribing circle of the second cross section located in the center of the eighth subtype regulatory particle along the extension direction of the long axis of the eighth subtype regulatory particle is 1 micron or less, and may be, for example, 0 microns, 0.95 microns, 0.8 microns, 0.78 microns, 0.75 microns, 0.72 microns, 0.7 microns, 0.68 microns, 0.65 microns, 0.62 microns, 0.6 microns, 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. Along a direction away from the center of the eighth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the eighth subtype regulatory particle gradually decreases, and the change value of the diameter of the first circumscribing circle of the second cross section at the second end of the eighth subtype regulatory particle is 1 micron or less, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, 0.68 micron, 0.65 micron, 0.62 micron. The thickness may be 0.6 microns, 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc.In some embodiments, the diameter of the second circumscribing circle of the second cross section located at the first end of the eighth subtype regulatory particle gradually decreases along a direction away from the central portion of the eighth subtype regulatory particle, and the diameter of the second circumscribing circle of the second cross section located at the second end of the eighth subtype regulatory particle is the same as the diameter of the second circumscribing circle of the second cross section located at the central portion of the eighth subtype regulatory particle.

[0095] The gradual decrease in diameter of the second circumscribing circle of the second cross section located at the first end of the eighth subtype regulating particle along the direction away from the central portion of the eighth subtype regulating particle means that the diameter of the second circumscribing circle of the second cross section located at the first end of the eighth subtype regulating particle shows a tendency to decrease in direction away from the central portion of the eighth subtype regulating particle, and can be understood to include, but is not limited to, the gradual decrease in diameter of the second circumscribing circle of the second cross section located at the first end of the eighth subtype regulating particle along the direction away from the central portion of the eighth subtype regulating particle.

[0096] In some embodiments, the second cross-section of the eighth subtype of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, or the like, or may be an irregular shape.

[0097] In some embodiments, the eighth subtype of regulatory particle may be a needle-shaped particle with a reduced diameter at one end.

[0098] In some embodiments, when the eighth subtype regulatory particle is a needle-shaped particle with a reduced diameter at one end, the second cross section of the eighth subtype regulatory particle may be circular or elliptical, and when the second cross section located at the second end of the eighth subtype regulatory particle or the second cross section located at the central portion of the eighth subtype regulatory particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse of any of the second cross sections located at the second end or the central portion of the eighth subtype regulatory particle is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The shape of the second cross section located at the first end of the eighth subtype regulatory particle is the same as the shape of the second cross section located at the central portion of the eighth subtype regulatory particle, and the area gradually decreases along the direction away from the central portion of the eighth subtype regulatory particle.

[0099] Along the extension direction of the long axis of the regulatory particle of the ninth subtype, the change value of the diameter of the second circumscribed circle of the second cross section located in the central part of the regulatory particle of the ninth subtype is 1 micron or less, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, 0.68 micron, 0.65 micron, 0.62 micron, 0.6 micron, 0.58 micron, 0.55 micron, 0.52 micron, 0.5 micron, 0.48 micron, 0.45 micron, 0.42 micron, 0.4 micron, 0.38 micron, 0. The diameter of the second circumscribing circle of the second cross section located at the first end of the ninth subtype regulatory particle may be 35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc., and the diameter of the second circumscribing circle of the second cross section located at the first end of the ninth subtype regulatory particle gradually decreases along the direction away from the center of the ninth subtype regulatory particle, and the diameter of the second circumscribing circle of the second cross section located at the second end of the ninth subtype regulatory particle gradually decreases along the direction away from the center of the ninth subtype regulatory particle. In some embodiments, the diameter of the second circumscribing circle of the second cross section located at the center of the ninth subtype regulatory particle is uniform along the extension direction of the major axis of the ninth subtype regulatory particle, and the diameters of the second circumscribing circle of the second cross section located at the first end of the ninth subtype regulatory particle and the second end of the ninth subtype regulatory particle gradually change along the extension direction of the major axis of the ninth subtype regulatory particle.

[0100] The gradual decrease in diameter of the second circumscribing circle of the second cross section located at the first end of the 9th subtype regulatory particle along the direction away from the central portion of the 9th subtype regulatory particle means that the diameter of the second circumscribing circle of the second cross section located at the first end of the 9th subtype regulatory particle shows a tendency to decrease in direction away from the central portion of the 9th subtype regulatory particle, and can be understood to include, but is not limited to, the sequential decrease in diameter of the second circumscribing circle of the second cross section located at the first end of the 9th subtype regulatory particle in the direction away from the central portion of the 9th subtype regulatory particle.

[0101] The gradual decrease in diameter of the second circumscribing circle of the second cross section located at the second end of the 9th subtype regulatory particle along the direction away from the central portion of the 9th subtype regulatory particle means that the diameter of the second circumscribing circle of the second cross section located at the second end of the 9th subtype regulatory particle shows a tendency to decrease in diameter in the direction away from the central portion of the 9th subtype regulatory particle, and can be understood to include, but is not limited to, a gradual decrease in diameter of the second circumscribing circle of the second cross section located at the second end of the 9th subtype regulatory particle along the direction away from the central portion of the 9th subtype regulatory particle.

[0102] In some embodiments, the second cross-section of the ninth subtype of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, or may be an irregular shape.

[0103] In some embodiments, the ninth subtype of regulatory particles may be needle-shaped particles with reduced diameters at both ends.

[0104] In some embodiments, when the ninth subtype regulatory particle is a needle-like particle with a diameter decreasing at both ends, the shape of the second cross section of the ninth subtype regulatory particle may be circular or elliptical, and when the second cross section located at the center of the ninth subtype regulatory particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse formed by any of the second cross sections located at the center of the ninth subtype regulatory particle may be greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The shapes of the second cross sections located at the first end of the ninth subtype regulatory particle and the second end of the ninth subtype regulatory particle are the same as the shape of the second cross section located at the center of the ninth subtype regulatory particle, and the area gradually decreases along a direction away from the center of the ninth subtype regulatory particle.

[0105] The first end of the 10th subtype regulatory particle is connected to the second end of the 10th subtype regulatory particle, and the diameter of the second circumscribing circle of the second cross section of the 10th subtype regulatory particle gradually decreases along the direction from the first end of the 10th subtype regulatory particle to the second end of the 10th subtype regulatory particle.

[0106] The gradual decrease in the diameter of the second circumscribing circle of the second cross section of the tenth subtype regulatory particle along the direction from the first end of the tenth subtype regulatory particle to the second end of the tenth subtype regulatory particle means that the diameter of the second circumscribing circle of the second cross section of the tenth subtype regulatory particle tends to decrease in the direction from the first end of the tenth subtype regulatory particle to the second end of the tenth subtype regulatory particle, and can be understood to include, but is not limited to, a gradual decrease in the diameter of the second circumscribing circle of the second cross section of the tenth subtype regulatory particle in the direction from the first end of the tenth subtype regulatory particle to the second end of the tenth subtype regulatory particle.

[0107] In some embodiments, the second cross-section of the tenth subtype of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, or the like, or may be an irregular shape.

[0108] In some embodiments, the tenth subtype of regulatory particle may be a cone-shaped particle.

[0109] In some embodiments, when the tenth subtype regulatory particle is a conical particle, the second cross-section of the tenth subtype regulatory particle is circular or elliptical. Along a direction from the first end of the tenth subtype regulatory particle to the second end of the tenth subtype regulatory particle, the shape of the second cross-section of the tenth subtype regulatory particle is constant, and its area gradually decreases. When the tenth subtype regulatory particle has an elliptical second cross-section, the ratio of the major axis of the ellipse to the minor axis of the ellipse formed by any of the tenth subtype regulatory particles is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0110] In some embodiments, compared with the eighth, ninth, and tenth subtype regulatory particles, the sixth and seventh subtype regulatory particles have a better improving effect in reducing the difference between the in-plane retardation value and the thickness direction retardation value of the optical film 101, and the improving effect of the seventh subtype regulatory particles is better than the improving effect of the sixth subtype regulatory particles. Therefore, preferably, the regulatory particles 1012 include the sixth subtype regulatory particles and / or the seventh subtype regulatory particles. When the regulatory particles 1012 include the sixth subtype regulatory particles and the seventh subtype regulatory particles, the mass fraction of the sixth subtype regulatory particles in the regulatory particles 1012 is greater than the mass fraction of the seventh subtype regulatory particles in the regulatory particles 1012. Preferably, the second type regulatory particles 1012b are composed of the seventh subtype regulatory particles and / or the sixth subtype regulatory particles. More preferably, said second type regulatory particles 1012b consist of regulatory particles of said seventh subtype.

[0111] In some embodiments, the regulating particles 1012 include the first type regulating particles 1012a and the second type regulating particles 1012b, which can improve the rainbow pattern problem caused by the optical film 101 while easily improving the chromaticity viewing angle and contrast enhancement effect of the optical film 101, thereby improving the display quality of a display device equipped with the optical film 101.

[0112] In some embodiments, the first type of regulating particles 1012a have a slightly weaker effect of reducing the difference between the in-plane retardation value and the thickness direction retardation value of the optical film 101 than the second type of regulating particles 1012b, and a smaller amount of the first type of regulating particles 1012a can significantly improve the chromaticity viewing angle of the optical film 101. Therefore, the mass fraction of the first type of regulating particles 1012a in the regulating particles 1012 is smaller than the mass fraction of the second type of regulating particles 1012b in the regulating particles 1012. For example, the mass fraction of the second type of regulating particles 1012b in the regulating particles 1012 is greater than 50%, and the mass fraction of the first type of regulating particles 1012a in the regulating particles 1012 is less than 50%. The mass fraction of the second type of regulatory particles 1012b in the regulatory particles 1012 may be 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 99%, etc.

[0113] In some embodiments, when the modulator particles 1012 include the second type modulator particles 1012b and the first type modulator particles 1012a, and the second type modulator particles 1012b include the sixth subtype modulator particles and the seventh subtype modulator particles, the mass fraction of the seventh subtype modulator particles in the modulator particles 1012 is greater than the mass fraction of the sixth subtype modulator particles in the modulator particles 1012, and the mass fraction of the sixth subtype modulator particles in the modulator particles 1012 is greater than or equal to the mass fraction of the first type modulator particles 1012a in the modulator particles 1012.

[0114] In some embodiments, the mass fraction of the sixth subtype regulatory particles in the regulatory particles 1012 may be 50% or more, such as 55%, 60%, 70%, 75%, 80%, 85%, 90%, 95%, 99%, 100%, etc. The mass fraction of the seventh subtype regulatory particles in the regulatory particles 1012 may be 25% or less, such as 20%, 15%, 10%, 5%, 3%, 1%, 0%, etc. The mass fraction of the first type regulatory particles 1012a in the regulatory particles 1012 may be 25% or less, such as 20%, 15%, 10%, 5%, 3%, 1%, 0%, etc.

[0115] In some embodiments, the first type of regulatory particles 1012a are selected from at least two of the first subtype, the second subtype, the third subtype, the fourth subtype, and the fifth subtype, and preferably the first type of regulatory particles 1012a are a mixture of the first subtype, the second subtype, and the third subtype, or the first type of regulatory particles 1012a are a mixture of the first subtype, the fourth subtype, and the fifth subtype, or the first type of regulatory particles 1012a are a mixture of the first subtype, the second subtype, the third subtype, the fourth subtype, and the fifth subtype. By selecting the first type of regulating particles 1012a from at least two types of particles with different shapes, the diversity of shapes of the first type of regulating particles 1012a is increased, the optical anisotropy of the first type of regulating particles 1012a is increased, and the contrast and brightness improvement effect of the first type of regulating particles 1012a is improved.When the first type of regulatory particles 1012a are selected from a first subtype of regulatory particles, a second subtype of regulatory particles, and a third subtype of regulatory particles, or when the first type of regulatory particles 1012a are selected from a first subtype of regulatory particles, a fourth subtype of regulatory particles, and a fifth subtype of regulatory particles, or when the first type of regulatory particles 1012a are a mixture of the first subtype of regulatory particles, the second subtype of regulatory particles, the third subtype of regulatory particles, the fourth subtype of regulatory particles, and the fifth subtype of regulatory particles, the mass fraction of the first subtype of regulatory particles in the first type of regulatory particles 1012a is 1 The mass fraction of the second subtype regulatory particles and / or the fourth subtype regulatory particles in the first type regulatory particles 1012a may be 40% to 50%, for example, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, etc.; and the mass fraction of the third subtype regulatory particles and / or the fifth subtype regulatory particles in the first type regulatory particles 1012a may be 45% to 55%, for example, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, etc. By mixing the first subtype regulating particles, the second subtype regulating particles and / or the fourth subtype regulating particles, the third subtype regulating particles and / or the fifth subtype regulating particles in the above ratios, the improvement effect of the regulating particles 1012 on contrast and brightness can be further improved.

[0116] In some embodiments, the mass fraction of the regulating particles 1012 in the optical film 101 is 20% or less, such as 0.0001%, 0.001%, 0.01%, 0.02%, 0.05%, 0.1%, 0.5%, 1%, 5%, 8%, 10%, 12%, 15%, 18%, etc., so that the regulating particles 1012 are uniformly dispersed in the optical film 101, effectively improving the rainbow pattern problem of the optical film 101 in large angle directions, and improving the display quality of a display device including the optical film 101. Even if the mass fraction of the regulating particles 1012 in the optical film 101 is small, they can still effectively reduce the rainbow pattern of the optical film 101 in large angle directions, and the smaller the mass fraction, the better the dispersion. Preferably, the mass fraction of the regulating particles 1012 in the optical film 101 is 10% or less, more preferably, the mass fraction of the regulating particles 1012 in the optical film 101 is 5% or less, more preferably, the mass fraction of the regulating particles 1012 in the optical film 101 is 1% or less, and more preferably, the mass fraction of the regulating particles 1012 in the optical film 101 is 0.05% or less. At the same time, in order to ensure that the number of the regulating particles 1012 in the optical film 101 is sufficient to effectively improve the rainbow pattern problem of the optical film 101 in large angle directions, the mass fraction of the regulating particles 1012 in the optical film 101 may be 0.0001% or more, and further, the mass fraction of the regulating particles 1012 in the optical film 101 may be 0.001% or more, preferably 0.003% or more, more preferably 0.005% or more, even more preferably 0.015% or more, and more preferably 0.03% or more.

[0117] In some embodiments, the first type of modulating particles 1012a are whiskers. The material of the second type of modulating particles 1012b and the material of the first type of modulating particles 1012a are selected from at least one of silicon dioxide, silicon carbide, silicon nitride, zinc oxide, magnesium oxide, aluminum oxide, calcium sulfate, calcium carbonate, potassium titanate, and aluminum borate.

[0118] In some embodiments, the first type of regulating particles 1012a and / or the second type of regulating particles 1012b may be surface-modified to facilitate dispersion of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b within the substrate 1011 or to enhance functionality, such as toughness, of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b. When the first type of regulating particles 1012a and / or the second type of regulating particles 1012b are surface-modified, the surfaces of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b are modified with at least one of inorganic cations, inorganic anions, polymers, coupling agents, or surfactants, i.e., the surfaces of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b include at least one of inorganic cation groups, inorganic anion groups, polymer groups, coupling agent groups, or surfactant groups.

[0119] Specifically, the surfaces of the first-type regulating particles 1012a and / or the second-type regulating particles 1012b are modified with at least one selected from magnesium chloride, calcium chloride, barium chloride, strontium chloride, stearic acid, sodium stearate, zinc stearate, sulfonic acid surfactants, thio surfactants, titanates, aluminates, polyacrylamides, silanes, alkyl phosphates, aryl phosphates, alkyl phosphates, aryl phosphates, alkyl alcohol amide phosphates, alkyl alcohol amide phosphates, imidazoline phosphates, imidazoline phosphates, high polyphosphates, high polyphosphates, and siloxane phosphates. Preferably, the surfaces of the first-type regulating particles 1012a and / or the second-type regulating particles 1012b are modified with at least one of sulfonic acid surfactants or thio surfactants. The sulfonic acid surfactant may be selected from at least one of alkyl sulfonates and fluoroalkyl sulfonates, specifically at least one of sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, and sodium fluorododecyl sulfonate. The thio surfactant may be selected from at least one of mercaptans and fluoromercaptans, specifically at least one of octanethiol, dodecanethiol, tetradecanethiol, octadecanethiol, fluorooctanethiol, and fluorododecanethiol. When the sulfonic acid surfactant is mixed with the regulating particles 1012 to be surface-modified, the sulfonic acid surfactant forms a sulfonic acid group shell layer, such as a benzene ring sulfonic acid group shell layer, on the surface of the whiskers, which is advantageous for protecting the regulating particles 1012, increasing their toughness, and reducing breakage of the first type regulating particles 1012a and / or the second type regulating particles 1012b in the optical film 101.When thio-based surfactant groups are mixed with the regulating particles 1012 to be surface-modified, the thio-based surfactant groups and the hydroxyl groups on the whisker surface form an OSO cross-linked network, and the binding energy of OSO is relatively large, which is advantageous for protecting the first type of regulating particles 1012a and / or the second type of regulating particles 1012b during the process of mixing the first type of regulating particles 1012a and / or the second type of regulating particles 1012b with the material of the substrate 1011 to form the optical film 101, reducing damage to the first type of regulating particles 1012a and / or the second type of regulating particles 1012b, and improving the effect of improving optical functions such as contrast and brightness provided by the first type of regulating particles 1012a and / or the second type of regulating particles 1012b. More preferably, the first type regulating particles 1012a and / or the second type regulating particles 1012b are modified with at least one of sulfonic acid surfactants having a fluorine substituent and thio surfactants having a fluorine substituent, specifically at least one of sodium fluorododecylsulfonate, fluorooctanethiol, and fluorododecanethiol, wherein fluorine atoms are highly stable within alkyl chains, the bond energy of carbon-fluorine bonds is higher than that of carbon-carbon bonds, and carbon-fluorine bonds have the effect of shielding carbon-carbon bonds and are advantageous for protecting carbon-carbon bonds, thereby improving the stability of the first type regulating particles 1012a and / or the second type regulating particles 1012b.

[0120] In some embodiments, the optical film 101 has an in-plane retardation value, and by adding the regulating particles 1012, the difference between the in-plane retardation value and the thickness direction retardation value of the optical film 101 is reduced, and the in-plane retardation value of the optical film 101 is less than 3000 nanometers, thereby improving the rainbow pattern problem caused by the optical film 101.

[0121] In some embodiments, the in-plane retardation value of the optical film 101 is the retardation value of the optical film 101 in the plane in which the optical film 101 is arranged, and the plane in which the optical film 101 is arranged is perpendicular to the thickness direction Y of the optical film 101. The optical film 101 has a thickness direction retardation value in the thickness direction Y of the optical film 101. When light passes through the optical film 101, a difference occurs between the in-plane retardation value of the optical film 101 and the thickness direction retardation value of the optical film 101 due to the difference between the refractive index of the light in the plane on which the optical film 101 is disposed and the refractive index of the light in the thickness direction Y of the optical film 101. When the in-plane retardation value of the optical film 101 is 3000 nanometers or more, the difference between the in-plane retardation value of the optical film 101 and the thickness direction retardation value of the optical film 101 is too large, and therefore, when the light passes through the optical film 101 and is observed at a large angle (for example, 45°, 60°, etc. with respect to the thickness direction Y of the optical film 101), a rainbow pattern phenomenon occurs. By adding the regulating particles 1012, the difference between the refractive index of light in the plane where the optical film 101 is arranged and the refractive index of light in the thickness direction Y of the optical film 101 is reduced, and the in-plane retardation value of the optical film 101 is less than 3000 nanometers, thereby improving the problem of rainbow patterns in large angle directions of the optical film 101 and improving the display quality of the display device using the optical film 101.

[0122] In some embodiments, the in-plane retardation value of the optical film 101 can be calculated by the following formula: Re=d×|n x -n y |

[0123] Here, Re represents the in-plane retardation value of the optical film 101, and n x represents the extraordinary refractive index, and n y represents the ordinary refractive index, and d represents the thickness of the optical film 101.

[0124] In some embodiments, the in-plane retardation value of the optical film 101 can be determined from the difference between the extraordinary refractive index and the ordinary refractive index of the optical film 101 obtained by a retardation measurement device (e.g., Shintech's Optipro-micro) under a continuous spectrum white light source, and therefore the in-plane retardation value of the optical film 101 can be determined by the above formula.

[0125] In some embodiments, the retardation in the thickness direction of the optical film 101 is determined by the anisotropy values ​​ΔN of two pairs of refractive indexes of the optical film 101 observed in a cross section perpendicular to the plane on which the optical film 101 is disposed. xz =Δ|n x -n z |, ΔN yz =Δ|n y -n z and the thickness of the optical film 101, and n z is the refractive index of the optical film 101 in the thickness direction.

[0126] In some embodiments, the in-plane retardation value of the optical film 101 is 0 nanometers or more, and the in-plane retardation value of the optical film 101 is 1000 nanometers or less, which is advantageous for further reducing the difference between the in-plane retardation value of the optical film 101 and the retardation value in the thickness direction of the optical film 101. For example, the in-plane retardation value of the optical film 101 is 20 nanometers, 50 nanometers, 100 nanometers, 120 nanometers, 150 nanometers, 200 nanometers, 220 nanometers, 250 nanometers, 300 nanometers, 320 nanometers, 350 nanometers, The optical film 101 may have an in-plane retardation value of 0 nm or more, and an in-plane retardation value of 500 nm or less, which may further effectively alleviate the rainbow pattern problem of the optical film 101 in a large angle direction. More preferably, the in-plane retardation value of the optical film 101 is equal to or greater than 0 nanometers and equal to or less than 200 nanometers, so that the range of the in-plane retardation value of the optical film 101 is closest to the range of the retardation value in the thickness direction of the optical film 101, thereby most effectively improving the rainbow pattern problem of the optical film 101 in large angle directions and improving the display quality of a display device including the optical film 101.

[0127] In some embodiments, the closer the ratio of the in-plane retardation value of the optical film 101 to the retardation value in the thickness direction of the optical film 101 is to 1, the smaller the difference between the refractive index of light in the plane where the optical film 101 is disposed and the refractive index of light in the thickness direction Y of the optical film 101 is, which is advantageous for eliminating the problem of rainbow patterns. When the ratio of the in-plane retardation value of the optical film 101 to the retardation value in the thickness direction of the optical film 101 is greater than 0.1 and the ratio of the in-plane retardation value of the optical film 101 to the retardation value in the thickness direction of the optical film 101 is less than 2, for example, 0.2, 0.5, 0.6, 0.8, 1, 1.2, 1.4, 1.5, 1.6, 1.8, etc., the problem of rainbow patterns can be effectively improved. Preferably, the problem of rainbow patterns can be essentially avoided if the ratio of the in-plane retardation value of the optical film 101 to the retardation value in the thickness direction of the optical film 101 is 0.5 or more and 1.5 or less. More preferably, the ratio of the in-plane retardation value of the optical film 101 to the retardation value in the thickness direction of the optical film 101 is 0.6 or more and 1.2 or less, so that the problem of rainbow patterns can be completely solved.

[0128] In some embodiments, the substrate 1011 is selected from at least one of modified or unmodified polyester, modified or unmodified cellulose acetate, and modified or unmodified polycycloolefin.

[0129] In some embodiments, the modified or unmodified polyester may include at least one of modified or unmodified polyethylene terephthalate, modified or unmodified polycarbonate, modified or unmodified polymethyl methacrylate, modified or unmodified polyethylene naphthalate, modified or unmodified polyethylene terephthalate. The modified or unmodified cellulose acetate may include modified or unmodified cellulose triacetate.

[0130] In some embodiments, the substrate 1011 may include a first sub-substrate and / or a second sub-substrate, and the first sub-substrate may be selected from at least one of unmodified polyester and unmodified cellulose acetate. The second sub-substrate may be selected from at least one of modified polyester and modified cellulose acetate. The mass fraction of the first sub-substrate in the substrate 1011 is greater than the mass fraction of the second sub-substrate.

[0131] In some embodiments, the first sub-substrate and the second sub-substrate are uniformly mixed with each other, and the mass fraction of the first sub-substrate in the substrate 1011 is 65% or more, such as 70%, 75%, 80%, 85%, 90%, 95%, 99%, etc. The mass fraction of the second sub-substrate in the substrate 1011 is 35% or less, such as 1%, 5%, 10%, 15%, 20%, 25%, 30%, etc. Good mutual solubility between modified polyethylene terephthalate polyester and unmodified polyethylene terephthalate polyester, or between modified cellulose acetate and unmodified cellulose acetate cellulose triacetate, is advantageous, improving the mechanical properties, flatness, and crystallinity of the substrate 1011 and helping to improve the dispersion of the regulating particles 1012, thereby improving the optical performance of the optical film 101.

[0132] In some embodiments, modified cellulose triacetate, modified polyethylene terephthalate, modified polycarbonate, modified polymethyl methacrylate, or modified polyethylene naphthalate can be obtained by hydrophilizing or lipophilizing unmodified cellulose triacetate, unmodified polyethylene terephthalate, unmodified polycarbonate, unmodified polymethyl methacrylate, or unmodified polyethylene naphthalate, respectively. For example, modified polyethylene terephthalate can be obtained by introducing a linear alkyl side chain, a carboxyl side chain, a hydroxyl side chain, or a fluorine-containing side chain into unmodified polyethylene terephthalate. When the modified polyethylene terephthalate is unmodified polyethylene terephthalate into which a carboxyl side chain and / or a hydroxyl side chain has been introduced, the modified polyethylene terephthalate can be obtained by introducing a phenyl group of unmodified polyethylene terephthalate into the phenyl group of unmodified polyethylene terephthalate. TIFF2025540370000002.tif2039, TIFF2025540370000003.tif2049 group may be introduced, where n and m are both integers between 0 and 10.

[0133] In some embodiments, when the first sub-substrate is selected from unmodified polyethylene terephthalate, selecting the second sub-substrate from modified polyethylene terephthalate is advantageous due to the good mutual solubility of modified polyethylene terephthalate and unmodified polyethylene terephthalate, which helps to improve the mechanical properties, flatness, and crystallinity of the substrate 1011 and improve the dispersion of the regulating particles 1012, thereby improving the optical performance of the optical film 101.

[0134] In some embodiments, the refractive index difference between the substrate 1011 and the regulating particles 1012 is 0.02 or more, such as 0.03, 0.05, 0.09, 0.1, 0.15, 0.2, etc., so that the regulating particles 1012 can improve the rainbow pattern problem of the optical film 101 and at the same time achieve a light diffusion function to further improve the optical performance of the optical film 101. Preferably, the refractive index difference between the substrate 1011 and the regulating particles 1012 is 0.1 or more, such as 0.12, 0.13, 0.14, 0.15, 0.2, etc.

[0135] In some embodiments, the glass transition temperature of the substrate 1011 is between 70°C and 600°C, and may be, for example, 80°C, 90°C, 100°C, 150°C, 200°C, 250°C, 300°C, 350°C, 400°C, 450°C, 500°C, 550°C, etc.

[0136] In some embodiments, the elastic modulus of the substrate 1011 at 23°C may be 500 MPa to 5000 MPa, for example, 600 MPa, 700 MPa, 800 MPa, 900 MPa, 1000 MPa, 1200 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2200 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3200 MPa, 3500 MPa, 3800 MPa, 4000 MPa, 4200 MPa, 4500 MPa, 4800 MPa, etc.

[0137] In some embodiments, the modulus of elasticity of the substrate 1011 is obtained at 50% humidity.

[0138] In some embodiments, the thickness of the optical film 101 is 5 microns or more and 100 microns or less, for example, 10 microns, 50 microns, 60 microns, 80 microns, 90 microns, etc., which facilitates processing of the optical film 101 and helps maintain appropriate light transmittance of the optical film 101. Preferably, the thickness of the optical film 101 is 15 microns or more and 100 microns or less, for example, 20 microns, 25 microns, 30 microns, 40 microns, 50 microns, 60 microns, 80 microns, etc.

[0139] The optical film 101 provided in the embodiments of the present application has regulating particles 1012 added to the substrate 1011 of the optical film 101, and at least one of the first type of regulating particles 1012a and the second type of regulating particles 1012b is dispersed in the dispersion portion 1011a, thereby obtaining a better optical improvement effect by the regulating particles 1012 and improving the display quality of the display device equipped with the optical film 101.

[0140] Furthermore, in the examples of the present application, the mechanical properties of the optical film 101 are measured, and the measuring device is a single-pole computer system tensile tester (model AI-3000, manufactured by High Speed ​​Railway Testing Instruments Co., Ltd.).

[0141] Test procedure: Take a sample with a width x thickness of 250mm x 200mm and place it on the testing device using a clamp, and the speed is 100-200mm / min.

[0142] The formula for calculating tensile strength includes: TIFF2025540370000004.tif2139Here, σ is the tensile strength (MPa), p is the maximum load (N), b is the width of the test specimen (mm), and h is the thickness of the test specimen (mm).

[0143] The formula for calculating the breaking elongation is as follows: TIFF2025540370000005.tif2464Here, e is the breaking elongation (%), L1 is the distance (mm) between the two marking lines on the test specimen when not stretched, and L2 is the distance (mm) between the two marking lines when the test specimen breaks.

[0144] The median of the five calculated values ​​in the machine and cross directions is the test result, and the maximum and minimum values ​​in each direction are reported. The tensile strength results are expressed to three significant digits, and the breaking elongation results are expressed to two significant digits, and the results are shown in Table 1 below. [Table 1]

[0145] As can be seen from Table 1, in the embodiment of the present application, the mechanical properties of the optical film 101 can be effectively improved by including the regulating particles 1012 in the optical film 101 .

[0146] The tensile strength may be the tensile strength along the TD direction of the optical film 101 or the tensile strength along the MD direction of the optical film 101.

[0147] In some embodiments, the tensile strength of the optical film 101 is 30 MPa or more and 300 MPa or less, and more preferably, the tensile strength of the optical film 101 is greater than 180 MPa, such as 190 MPa, 200 MPa, 210 MPa, 220 MPa, 230 MPa, 240 MPa, 250 MPa, 260 MPa, 270 MPa, 280 MPa, 290 MPa, or 300 MPa.

[0148] In some embodiments, the elongation at break of the optical film 101 is greater than or equal to 1% and less than or equal to 300%, and more preferably, the elongation at break of the optical film 101 is greater than 55%, such as 60%, 70%, 80%, 90%, 100%, 110%, 120%, 130%, 140%, 150%, 160%, 170%, 180%, 190%, 200%, 210%, 220%, 230%, 240%, 250%, 260%, 270%, 280%, 290%, or 300%.

[0149] In some embodiments, the optical film 101 has a breaking strength of 50 N / mm or more and 500 N / mm or less, for example, 50 N / mm, 100 N / mm, 150 N / mm, 200 N / mm, 250 N / mm, 300 N / mm, 350 N / mm, 400 N / mm, 450 N / mm, or 500 N / mm. The optical film has a heat shrinkage of less than 2%, for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, or 1.9%.

[0150] In some embodiments, when the material of the substrate 1011 of the optical film 101 is polymethyl methacrylate, the tensile strength of the optical film 101 may be in the range of 30 MPa to 150 MPa, and the breaking elongation of the optical film 101 may be in the range of 5% to 70%. When the material of the substrate 1011 of the optical film 101 is polyethylene terephthalate, the tensile strength of the optical film 101 may be in the range of 100 MPa to 300 MPa, and the breaking elongation of the optical film 101 may be in the range of 50% to 300%.

[0151] Referring to FIGS. 7 to 10, an embodiment of the present application further provides a polarizer 100 including the optical film 101 described above.

[0152] The polarizer 100 further includes a polarizing layer 102 disposed on one side of the optical film 101 .

[0153] 7 to 8 and 10, in some embodiments, the first surface of the optical film 101 is attached to the side of the polarizing layer 102 closer to the optical film 101, and the second surface of the optical film 101 is located on the opposite side of the first surface of the optical film 101 from the polarizing layer.

[0154] Preferably, the polarizer further includes a first optically functional layer located on at least one side of the substrate, the first optically functional layer including at least one of an anti-glare sublayer, a transparent cured sublayer, a low-reflection sublayer, an anti-reflection sublayer, an anti-fingerprint sublayer, and an anti-static sublayer, and the side of the dispersion portion away from the polarizing layer is flush with the second surface, wherein the first optically functional layer is located between the polarizing layer and the optical film, or the first optically functional layer is located on the opposite side of the optical film from the polarizing layer.

[0155] Specifically, the polarizer 100 further includes a first adhesive layer 104 located on the side of the optical film 101 closer to the polarizing layer 102, and the first surface of the optical film is attached to the side of the polarizing layer 102 closer to the optical film 101 via the first adhesive layer 104.

[0156] 7 to 10 , in some embodiments, the side of the dispersion portion 1011a away from the polarizing layer is flush with the second surface. When the polarizer 100 is applied to a display device, the polarizer 100 may be located on the light-emitting side of a display panel of the display device, and the optical film 101 is located on the light-emitting side of the polarizing layer 102. By making the side of the dispersion portion 1011a away from the polarizing layer flush with the second surface, the dispersion portion 1011a is closer to the user side of the display device, making it easier for the user to experience the optical improvement effects of the first type regulating particles 1012a and / or the second type regulating particles 1012b dispersed in the dispersion portion 1011a, and improving the display quality of a display device including the polarizer 100.

[0157] Referring to FIGS. 7 to 10, in some embodiments, the polarizer 100 further includes a first optically functional layer 103 located on at least one side of the substrate 1011 .

[0158] Here, the first optical functional layer 103 is located between the polarizing layer 102 and the optical film 101 (not shown), or the first optical functional layer 103 is located on the opposite side of the optical film 101 from the polarizing layer 102 (shown in Figures 7 to 9).

[0159] 7 to 8 and 10, in some embodiments, the first adhesive layer 104 is in direct contact with the polarizing layer 102, or in some embodiments, as shown in FIG. 9, the polarizer 100 further includes a protective layer 105 positioned between the optical film 101 and the polarizing layer 102, and the first adhesive layer 104 is in direct contact with the protective layer 105.

[0160] In some embodiments, the first adhesive layer 104 is in direct contact with the optical film 101, and the first adhesive layer 104 is in direct contact with the polarizing layer 102, or the first adhesive layer 104 is in direct contact with the optical film 101 and the first adhesive layer 104 is in direct contact with the protective layer 105.

[0161] In some embodiments, the first adhesive layer 104 may be selected from at least one of a water-based adhesive, a pressure-sensitive adhesive, and an ultraviolet adhesive, where the water-based adhesive material may be selected from polyvinyl alcohol, the pressure-sensitive adhesive material may be selected from an acrylate copolymer, and the ultraviolet adhesive material may be selected from a multifunctional acrylate monomer.

[0162] 7 to 9, in some embodiments, the first optical functional layer 103 includes at least one of a transparent cured sub-layer 107 (shown in FIGS. 7 and 8), a low-reflection sub-layer 108 (shown in FIG. 9), an anti-reflection sub-layer, an anti-fingerprint sub-layer, and an anti-static sub-layer. Referring to FIG. 9, when the first optical functional layer 103 is a low-reflection sub-layer 108, the low-reflection sub-layer 108 may be formed by stacking a transparent cured sub-portion 108b and a low refractive index sub-portion 108a.

[0163] Referring to FIG. 10, in some embodiments, the protective layer 105 is located on the opposite side of the optical film 101 from the polarizing layer 102 .

[0164] In some embodiments, the polarizing layer 102 is composed of polyvinyl alcohol and a dye.

[0165] 7 to 10 , in some embodiments, the polarizer 100 further includes a release layer 109 located on the side of the polarizing layer 102 away from the optical film 101, and the release layer 109 and the polarizing layer 102 are bonded together via a second adhesive layer 110. When the polarizer 100 is used in a display device, the release layer 109 is removed to expose the second adhesive layer 110, and the polarizer 100 is attached to a display panel via the second adhesive layer 110.

[0166] 7 to 10, in some embodiments, the polarizer 100 further includes a compensation layer 111 located between the second adhesive layer 110 and the polarizing layer 102.

[0167] In the embodiment of the present application, by arranging the optical film 101, optical defects such as moire and white spots caused by the polarizer 100 can be avoided, while at the same time improving the chromaticity viewing angle and contrast of a display device using the polarizer 100.

[0168] Referring to FIG. 11, an embodiment of the present application further provides a display device 10 including the polarizer 100 described above.

[0169] Specifically, the display device includes a display panel 200 and a first polarizer 300, the first polarizer 300 being disposed on the light-emitting side of the display panel 200, and the first polarizer 300 being selected from the polarizers 100 described above.

[0170] In some embodiments, the display panel 200 may be a liquid crystal display panel, a self-luminous display panel, etc., and the self-luminous display panel may be an OLED (Organic Light-Emitting Diode) display panel, etc.

[0171] In some embodiments, the optical film 101 of the first polarizer 300 is disposed on the side of the polarizing layer 102 of the first polarizer 300 that faces away from the display panel.

[0172] When the display panel 200 is a liquid crystal display panel, the display device 10 further includes a backlight module 400 disposed on a side of the display panel 200 away from the first polarizer 300, the backlight module 400 being used to provide a light source for the display panel 200, and the display device 10 further includes a second polarizer 500 located between the backlight module 400 and the display panel 200. The second polarizer 500 may be selected from the polarizers 100 described above, or the second polarizer 500 does not have to be selected from the polarizers 100 described above.

[0173] The present application will now be described in more detail with reference to some examples, however, it should be noted that these examples are provided for illustrative purposes only and should not be construed as limiting the present application in any way.

[0174] Example 1 In this embodiment, the substrate material is unmodified polyethylene terephthalate, the regulating particles in the substrate are spherical polystyrene, the regulating particles are dispersed in an upper substrate sub-layer with a thickness of 20 microns in the substrate, and the upper substrate sub-layer with a thickness of 20 microns, the middle substrate sub-layer with a thickness of 20 microns, and the lower substrate sub-layer with a thickness of 20 microns are stretched in the MD direction (moving direction) and the TD direction (transfer direction) (stretching ratio MD x TD is 5 x 3) to form an optical film 1 with a thickness of 60 microns, and the mass fraction of the regulating particles in the optical film 1 is 0.5%.

[0175] Example 2 This example is the same as or similar to Example 1, except that the control particles are rod-shaped calcium carbonate and an optical film 2 is formed.

[0176] Example 3 This example is the same as or similar to Example 1, except that the control particles are cubic calcium carbonate and an optical film 3 is formed.

[0177] Example 4 This example is similar to Example 1, except that the control particles are formed by mixing rod-shaped calcium carbonate, spherical polystyrene, and cubic silica in a mass ratio of 2:6:2, and the optical film 4 is formed.

[0178] Example 5 This example is similar to Example 2, except that the conditioning particles are dispersed in an 18 micron thick upper substrate sub-layer within the substrate to form optical film 5.

[0179] Example 6 This example is similar to Example 3, except that the conditioning particles are dispersed in a 20 micron thick intermediate substrate sub-layer within the substrate to form optical film 6.

[0180] Example 7 This example is similar to Example 6, except that the conditioning particles are dispersed in a 20 micron thick lower substrate sub-layer within the substrate to form optical film 7.

[0181] Example 8 This example is similar to Example 4, except that the conditioning particles are dispersed in a 2 micron thick upper substrate sub-layer within the substrate to form optical film 8.

[0182] Example 9 This example is similar to Example 4, except that the conditioning particles are dispersed in a 6 micron thick upper substrate sub-layer within the substrate to form optical film 9.

[0183] Example 10 This example is similar to Example 4, except that the conditioning particles are dispersed in a 12 micron thick upper substrate sub-layer within the substrate to form the optical film 10.

[0184] Example 11 This example is similar to Example 4, except that the conditioning particles are dispersed in a 15 micron thick upper substrate sub-layer within the substrate to form optical film 11.

[0185] Example 12 This example is similar to Example 4, except that the conditioning particles are dispersed in a 30 micron thick upper substrate sub-layer within the substrate to form the optical film 12.

[0186] Example 13 This example is similar to Example 4, except that the conditioning particles are dispersed in a 40 micron thick upper substrate sub-layer within the substrate to form optical film 13.

[0187] Example 14 This example is similar to Example 4, except that the conditioning particles are dispersed in a 48 micron thick upper substrate sub-layer within the substrate to form optical film 14.

[0188] Example 15 This example is similar to Example 4, except that the conditioning particles are dispersed in a 54 micron thick upper substrate sub-layer within the substrate to form optical film 15.

[0189] Example 16 This example is similar to Example 4, except that the conditioning particles are dispersed in a 58 micron thick upper substrate sub-layer within the substrate to form optical film 16.

[0190] Comparative Example 1 This comparative example is similar to Example 2, except that conditioning particles are dispersed in the upper, middle, and lower substrate sub-layers to form Comparative Optical Film 1.

[0191] The in-plane retardation values ​​of the optical films obtained in Examples 1 to 16 and the comparative optical film obtained in Comparative Example 1 were measured using an Optipro-micro retardation measuring device from Shintech Co., Ltd. The results are shown in Table 2.

[0192] The optical films obtained in Examples 1 to 16 and the comparative optical film obtained in Comparative Example 1 were placed on the side of a polarizer away from the display panel, and the polarizer was attached to the surface of a 75-inch liquid crystal display panel. The rainbow pattern was observed from the front and side, and the results are shown in Table 2. The polarizer to be tested included a compensation layer, a polarizing layer, a protective layer, an optical film (or a comparative optical film), and a transparent cured sub-layer, which were laminated in this order.

[0193] The optical films obtained in Examples 1 to 16 were placed on the side of a polarizer away from the display panel, with the upper substrate sub-layer positioned on the side of the middle substrate sub-layer away from the display panel and the lower substrate sub-layer positioned on the side of the middle substrate sub-layer closer to the display panel. The polarizers were attached to the surface of a 75-inch liquid crystal display panel, and the optical effects were further tested, the results of which are shown in Table 2. The tested polarizers included a compensation layer, a polarizing layer, a protective layer, an optical film (or a comparative optical film), and a transparent cured sub-layer, which were stacked in order.

[0194] Contrast is the ratio of the brightness of the display panel in its white state to the brightness of its dark state. This test measures the central luminance of the display panel in its white state and the central luminance of the display panel in its dark state.

[0195] The chromaticity viewing angle measurement is based on the CESI standard (CESI0.03). [Table 2]

[0196] As can be seen from Table 2, dispersing control particles in the substrate sub-layer of the substrate effectively reduces the in-plane retardation value of the optical film, eliminating the rainbow pattern problem, and improving contrast and sensillar viewing angle. Dispersing control particles in the dispersion section (upper substrate sub-layer) farther from the display panel further improves the optical film's contrast, sensillar viewing angle, and other optical improvements. Compared to dispersing control particles throughout the optical film, dispersing control particles in the dispersion section (e.g., upper substrate sub-layer) provides a greater optical improvement effect on the optical film's contrast, sensillar viewing angle, and other optical improvements. In terms of reducing the in-plane retardation value of the optical film, spherical particles are most effective, followed by cubic particles, control particles containing a mixture of particles of various shapes, and rod-shaped particles. In terms of improving the chromaticity, viewing angle and contrast of optical films, rod-shaped particles have the highest improvement effect, followed by control particles that are a mixture of particles of various shapes, cubic particles in third place, and spherical particles in third place.

[0197] The embodiments of the present application disclose an optical film, a polarizer, and a display device, the optical film comprising a substrate and regulating particles, the regulating particles comprising a first type of regulating particles and / or a second type of regulating particles, the aspect ratio of the first type of regulating particles being greater than or equal to 5 and less than 5, the aspect ratio of the second type of regulating particles being greater than or equal to 1 and less than 5, the first type of regulating particles and / or the second type of regulating particles being dispersed in a dispersion portion of the substrate, and the ratio of the thickness of the dispersion portion to the thickness of the substrate being greater than or equal to 1:100 and less than 1:1. In the present application, by adding regulating particles to the substrate of the optical film and dispersing at least one of the first type of regulating particles and the second type of regulating particles in the dispersion portion, a better optical improvement effect is achieved by the regulating particles, and the display quality of the display device equipped with the optical film is improved.

[0198] Although the optical film, polarizer, and display device provided in the examples of the present application have been introduced in detail, specific examples are used in this specification to explain the principles and embodiments of the present application. The above description of the examples is only used to understand the method and core concept of the present application. At the same time, those skilled in the art will be able to change the specific embodiments and application scope based on the concept of the present application. In short, the contents of this specification should not be understood as limiting the present application.

Claims

1. An optical film comprising a substrate and modulating particles; the substrate includes a dispersion portion, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is 1:100 or more and less than 1:1; The regulatory particles are dispersed in the dispersion portion, and the regulatory particles include a first type of regulatory particles and / or a second type of regulatory particles; The first type of regulating particle has a plurality of first cross sections, each of which has one first circumscribing circle, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 5 or more, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 50 or less; The second type of regulatory particle has a plurality of second cross sections, each of which has one second circumscribing circle, and the ratio of the length of the major axis of the second type of regulatory particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is 1 or more, and the ratio of the length of the major axis of the second type of regulatory particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is less than 5. Optical film.

2. The ratio of the thickness of the dispersion portion to the thickness of the substrate is 1:10 or more, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is 9:10 or less. The optical film according to claim 1 .

3. Along a thickness direction of the substrate, the substrate includes a first surface and a second surface arranged opposite to each other, a side of the dispersion portion closer to the first surface is parallel to the first surface, and a side of the dispersion portion closer to the second surface is parallel to or coincides with the second surface, Here, the ratio of the thickness of the dispersion portion to the thickness of the substrate is 1:4 or more, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is 1:2 or less. The optical film according to claim 1 .

4. The adjusting particles include the first type of adjusting particles, and the first type of adjusting particles are dispersed in the dispersion portion, and the major axis of the first type of adjusting particles forms an acute angle with a plane on which the first surface of the substrate is located, and the acute angle is 0° or more and 40° or less. The optical film according to any one of claims 1 to 3.

5. The regulatory particles include the second type of regulatory particles, and the second type of regulatory particles are also dispersed outside the dispersed portion. The optical film according to claim 4 .

6. The first type of regulatory particles are selected from at least one of a first subtype of regulatory particles, a second subtype of regulatory particles, a third subtype of regulatory particles, a fourth subtype of regulatory particles, and a fifth subtype of regulatory particles having different shapes, and the second type of regulatory particles are selected from at least one of a sixth subtype of regulatory particles, a seventh subtype of regulatory particles, an eighth subtype of regulatory particles, a ninth subtype of regulatory particles, and a tenth subtype of regulatory particles having different shapes; wherein the change in diameter of the first circumscribed circle of the first cross section of the first subtype regulatory particle along the extension direction of the long axis of the first subtype regulatory particle is 0.3 microns or less; Along the extension direction of the long axis of the second subtype regulatory particle, the change in diameter of the first circumscribing circle of the first cross section located at the center of the second subtype regulatory particle is 1 micron or less, and along the direction away from the center of the second subtype regulatory particle, the diameter of the first circumscribing circle of the first cross section located at the first end of the second subtype regulatory particle gradually decreases, and the change in diameter of the first circumscribing circle of the first cross section located at the second end of the second subtype regulatory particle is 1 micron or less; Along the extension direction of the long axis of the third subtype regulatory particle, the change in diameter of the first circumscribing circle of the first cross section located at the center of the third subtype regulatory particle is 1 micron or less, and along the direction away from the center of the third subtype regulatory particle, the diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulatory particle gradually decreases, and the diameter of the first circumscribing circle of the first cross section located at the second end of the third subtype regulatory particle gradually decreases; a first end of the fourth subtype regulatory particle is connected to a second end of the fourth subtype regulatory particle, and a diameter of a first circumscribing circle of the first cross section of the fourth subtype regulatory particle gradually decreases along a direction from the first end of the fourth subtype regulatory particle to the second end of the fourth subtype regulatory particle; a first end of the fifth subtype regulatory particle is connected to a second end of the fifth subtype regulatory particle, and a diameter of a first circumscribing circle of the first cross section located at the first end of the fifth subtype regulatory particle gradually decreases along a direction away from the second end of the fifth subtype regulatory particle; and a diameter of a first circumscribing circle of the first cross section located at the second end of the fifth subtype regulatory particle gradually decreases along a direction away from the first end of the fifth subtype regulatory particle; The diameter of the second circumscribing circle of the second cross section of the sixth subtype regulatory particle varies by 0.3 microns or less along the longitudinal axis of the sixth subtype regulatory particle; a first end of the seventh subtype regulatory particle is connected to a second end of the seventh subtype regulatory particle, and a diameter of a second circumscribing circle of the second cross section located at the first end of the seventh subtype regulatory particle gradually decreases along a direction away from the second end of the seventh subtype regulatory particle; and a diameter of a second circumscribing circle of the second cross section located at the second end of the seventh subtype regulatory particle gradually decreases along a direction away from the first end of the seventh subtype regulatory particle; Along the extension direction of the long axis of the eighth subtype regulatory particle, the change in diameter of the second circumscribing circle of the second cross section located at the center of the eighth subtype regulatory particle is 1 micron or less, and along the direction away from the center of the eighth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the eighth subtype regulatory particle gradually decreases, and the change in diameter of the second circumscribing circle of the second cross section located at the second end of the eighth subtype regulatory particle is 1 micron or less; Along the extension direction of the long axis of the ninth subtype regulatory particle, the change in diameter of the second circumscribing circle of the second cross section located at the center of the ninth subtype regulatory particle is 1 micron or less, and along the direction away from the center of the ninth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the ninth subtype regulatory particle gradually decreases, and the diameter of the second circumscribing circle of the second cross section located at the second end of the ninth subtype regulatory particle gradually decreases; The first end of the tenth subtype regulatory particle is connected to the second end of the tenth subtype regulatory particle, and the diameter of the second circumscribing circle of the second cross section of the tenth subtype regulatory particle gradually decreases along the direction from the first end of the tenth subtype regulatory particle to the second end of the tenth subtype regulatory particle. The optical film according to claim 1 .

7. The modulating particles include the first type of modulating particles and the second type of modulating particles, wherein the mass fraction of the first type of modulating particles in the modulating particles is less than 50% and the mass fraction of the second type of modulating particles in the modulating particles is greater than 50%. The optical film according to claim 6 .

8. The mass fraction of the regulating particles in the substrate is 0.0001% to 5%, and the tensile strength of the optical film is 30 MPa to 300 MPa. The optical film according to claim 1 .

9. The substrate includes a first sublayer, a second sublayer, and a third sublayer stacked together, the first sublayer and the third sublayer being located on opposite sides of the second sublayer, and the dispersion portion being located in at least one of the first sublayer, the second sublayer, and the third sublayer. The optical film according to claim 1 .

10. The dispersion portion is located in the first sub-layer and / or the third sub-layer. The optical film according to claim 9 .

11. the dispersion portion is located on a side of the first sublayer away from the second sublayer, and / or the dispersion portion is located on a side of the third sublayer away from the second sublayer. The optical film according to claim 10.

12. The tensile strength of the first sub-layer is greater than the tensile strength of the second sub-layer, and the tensile strength of the third sub-layer is greater than the tensile strength of the second sub-layer. The optical film according to claim 9 .

13. The transmittance of the second sublayer is greater than the transmittance of the first sublayer, and the transmittance of the second sublayer is greater than the transmittance of the third sublayer. The optical film according to claim 9 .

14. The optical film has a breaking elongation of 1% or more and 300% or less. The optical film according to claim 1 .

15. The optical film has a breaking strength of 50 N / mm or more and 500 N / mm or less, and a thermal shrinkage rate of less than 2%. The optical film according to claim 1 .

16. A polarizer comprising a polarizing layer and an optical film, wherein the polarizing layer is disposed on one side of the optical film, and a second surface of the optical film is located on an opposite side of the first surface of the optical film from the polarizing layer; The optical film includes a substrate and regulating particles, the substrate includes a dispersion portion, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is 1:100 or more and less than 1:1; The regulatory particles are dispersed in the dispersion portion, and the regulatory particles include a first type of regulatory particles and / or a second type of regulatory particles; The first type of regulating particle has a plurality of first cross sections, each of which has one first circumscribing circle, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 5 or more, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 50 or less; The second type of regulatory particle has a plurality of second cross sections, each of which has one second circumscribing circle, and the ratio of the length of the major axis of the second type of regulatory particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is 1 or more, and the ratio of the length of the major axis of the second type of regulatory particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is less than 5. Polarizer.

17. The substrate includes a first sublayer, a second sublayer, and a third sublayer stacked together, the first sublayer and the third sublayer being located on opposing sides of the second sublayer, and the dispersion portion being located in at least one of the first sublayer, the second sublayer, and the third sublayer. The polarizer of claim 16.

18. The dispersion portion is located in the first sub-layer and / or the third sub-layer.

18. The polarizer of claim 17.

19. the polarizer further comprises a first optically functional layer located on at least one side of the substrate, the first optically functional layer comprising at least one of an antiglare sublayer, a transparent cured sublayer, a low-reflection sublayer, an antireflection sublayer, an anti-fingerprint sublayer, and an antistatic sublayer, and a side of the dispersion portion away from the polarizing layer is flush with the second surface; wherein the first optical functional layer is located between the polarizing layer and the optical film, or The first optical functional layer is located on the opposite side of the optical film from the polarizing layer. The polarizer of claim 16.

20. A display device including a polarizer, the polarizer including a polarizing layer and an optical film, the polarizing layer being disposed on one side of the optical film, and a second surface of the optical film being located on an opposite side of the first surface of the optical film from the polarizing layer; The optical film includes a substrate and regulating particles, the substrate includes a dispersion portion, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is 1:100 or more and less than 1:1; The regulatory particles are dispersed in the dispersion portion, and the regulatory particles include a first type of regulatory particles and / or a second type of regulatory particles; The first type of regulating particle has a plurality of first cross sections, each of which has one first circumscribing circle, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 5 or more, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 50 or less; The second type of regulatory particle has a plurality of second cross sections, each of which has one second circumscribing circle, and the ratio of the length of the major axis of the second type of regulatory particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is 1 or more, and the ratio of the length of the major axis of the second type of regulatory particle to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is less than 5. Display device.

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