Optical film, polaroid, and display apparatus

Abstract

An optical film (101), a polaroid (100), and a display apparatus (10). Adjustment particles (1012) comprise first-type adjustment particles (1012a) and / or second-type adjustment particles (1012b), wherein the aspect ratio of the first-type adjustment particles (1012a) is greater than or equal to 5 and less than or equal to 50, the aspect ratio of the second-type adjustment particles (1012b) is greater than or equal to 1 and less than 5, the first-type adjustment particles (1012a) and / or the second-type adjustment particles (1012b) are dispersed inside a dispersion portion (1011a) of a base material (1011), and the ratio of the thickness of the dispersion portion (1011a) to the thickness of the base material (1011) is greater than or equal to 1:100 and less than 1:1.

Description

Optical film, polarizer and display device Technical Field

[0001] The present application relates to the field of display, and in particular to an optical film, a polarizer and a display device. Background Art

[0002] Currently, polarizers typically include a polarizing layer, and an optical film serves as a protective layer for the polarizing layer. Particles are typically dispersed throughout the optical film to improve its optical performance. However, to achieve this protective effect, the optical film requires a relatively thick thickness, making it difficult to match the required distribution thickness of the particles for optimal optical improvement. This leaves room for improvement in the display quality of display devices.

[0003] Therefore, an optical film, a polarizer, and a display device are urgently needed to solve the above technical problems. SUMMARY OF THE INVENTION

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

[0005] The present application provides an optical film, comprising:

[0006] A substrate comprising a dispersed portion, wherein a ratio of a thickness of the dispersed portion to a thickness of the substrate is greater than or equal to 1:100 and less than 1:1; and

[0007] Adjusting particles, dispersed in the dispersion portion, the adjusting particles comprising:

[0008] A first type of regulating particle has a plurality of first cross sections, each of the first cross sections has a first circumscribed circle, a ratio of the major axis length of the first type of regulating particle to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is greater than or equal to 5, and a ratio of the major axis length of the first type of regulating particle to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is less than or equal to 50; and / or

[0009] The second type of regulating particles has multiple second cross-sections, each of the second cross-sections has a second circumscribed circle, the ratio of the major axis length of the second type of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is greater than or equal to 1, and the ratio of the major axis length of the second type of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is less than 5.

[0010] The present application also 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 the second surface of the optical film is located on a side of the first surface of the optical film away from the polarizing layer;

[0011] The optical film comprises:

[0012] A substrate comprising a dispersed portion, wherein a ratio of a thickness of the dispersed portion to a thickness of the substrate is greater than or equal to 1:100 and less than 1:1; and

[0013] Adjusting particles, dispersed in the dispersion portion, the adjusting particles comprising:

[0014] A first type of regulating particle has a plurality of first cross sections, each of the first cross sections has a first circumscribed circle, a ratio of the major axis length of the first type of regulating particle to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is greater than or equal to 5, and a ratio of the major axis length of the first type of regulating particle to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is less than or equal to 50; and / or

[0015] The second type of regulating particles has multiple second cross-sections, each of the second cross-sections has a second circumscribed circle, the ratio of the major axis length of the second type of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is greater than or equal to 1, and the ratio of the major axis length of the second type of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is less than 5.

[0016] The present application also provides a display device, comprising a polarizer, wherein the polarizer comprises a polarizing layer and an optical film, wherein the polarizing layer is disposed on one side of the optical film, and the second surface of the optical film is located on a side of the first surface of the optical film away from the polarizing layer;

[0017] The optical film comprises:

[0018] A substrate comprising a dispersed portion, wherein a ratio of a thickness of the dispersed portion to a thickness of the substrate is greater than or equal to 1:100 and less than 1:1; and

[0019] Adjusting particles, dispersed in the dispersion portion, the adjusting particles comprising:

[0020] A first type of regulating particle has a plurality of first cross sections, each of the first cross sections has a first circumscribed circle, a ratio of the major axis length of the first type of regulating particle to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is greater than or equal to 5, and a ratio of the major axis length of the first type of regulating particle to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is less than or equal to 50; and / or

[0021] The second type of regulating particles has multiple second cross-sections, each of the second cross-sections has a second circumscribed circle, the ratio of the major axis length of the second type of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is greater than or equal to 1, and the ratio of the major axis length of the second type of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is less than 5. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] FIG1 is a schematic diagram of a first structure of an optical film provided in an embodiment of the present application;

[0024] FIG2 is a schematic diagram of a second structure of an optical film provided in an embodiment of the present application;

[0025] FIG3 is a schematic diagram of a third structure of an optical film provided in an embodiment of the present application;

[0026] FIG4 is a schematic diagram of a fourth structure of an optical film provided in an embodiment of the present application;

[0027] FIG5 is a schematic diagram of a fifth structure of an optical film provided in an embodiment of the present application;

[0028] FIG6 is a schematic diagram of a sixth structure of an optical film provided in an embodiment of the present application;

[0029] FIG7 is a schematic diagram of a first structure of a polarizer provided in an embodiment of the present application;

[0030] FIG8 is a schematic diagram of a second structure of a polarizer provided in an embodiment of the present application;

[0031] FIG9 is a schematic diagram of a third structure of a polarizer provided in an embodiment of the present application;

[0032] FIG10 is a schematic diagram of a fourth structure of a polarizer provided in an embodiment of the present application;

[0033] FIG11 is a schematic structural diagram of a display device provided in an embodiment of the present application. Modes for Carrying Out the Invention

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0035] Currently, the optical film used as a protective layer for the polarizing layer is relatively thick, which makes it difficult to match the distribution thickness of particles dispersed throughout the optical film to achieve a better optical improvement effect, resulting in a technical problem that the display quality of the display device still needs to be improved.

[0036] Referring to FIG. 1 to FIG. 4 , an embodiment of the present application provides an optical film 101, comprising:

[0037] The substrate 1011 includes a dispersion portion 1011 a , wherein a ratio of a thickness of the dispersion portion 1011 a to a thickness of the substrate 1011 is greater than or equal to 1:100 and less than 1:1; and

[0038] The regulating particles 1012 are dispersed in the dispersion portion 1011a. The regulating particles 1012 include:

[0039] The first type of regulating particle 1012a has a plurality of first cross sections, each of the first cross sections has a first circumscribed circle, the ratio of the major axis length of the first type of regulating particle 1012a to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is greater than or equal to 5, and the ratio of the major axis length of the first type of regulating particle 1012a to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is less than or equal to 50; and / or

[0040] The second type of regulating particle 1012b has multiple second cross-sections, each of which has a second circumscribed circle. The ratio of the long axis length of the second type of regulating particle 1012b to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is greater than or equal to 1, and the ratio of the long axis length of the second type of regulating particle 1012b to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is less than 5.

[0041] In the embodiment of the present application, by adding regulating particles 1012 to the substrate 1011 of the optical film 101, at least one of the first type regulating particles 1012a and the second regulating particles 1012 is dispersed in the dispersion portion 1011a, so that the regulating particles 1012 obtain a better optical improvement effect, thereby enhancing the display quality of the display device having the optical film 101.

[0042] Preferably, the ratio of the thickness of the dispersion portion to the thickness of the substrate is greater than or equal to 1:10, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is less than or equal to 9:10.

[0043] Preferably, along the thickness direction of the substrate, the substrate includes a first surface and a second surface disposed opposite to each other, a side of the dispersion portion close to the first surface is parallel to the first surface, and a side of the dispersion portion close to the second surface is parallel to or overlaps with the second surface;

[0044] Wherein, the ratio of the thickness of the dispersion portion to the thickness of the substrate is greater than or equal to 1:4, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is less than or equal to 1:2.

[0045] Preferably, along the thickness direction of the substrate, the first type of regulating particles are dispersed in the dispersion portion, and the long axis of the first type of regulating particles forms an acute angle with the plane where the first surface of the substrate is located, and the acute angle is greater than or equal to 0° and the acute angle is less than or equal to 40°.

[0046] Preferably, the regulating particles include the second type of regulating particles, and the second type of regulating particles are also dispersed outside the dispersion portion.

[0047] Preferably, the first type of regulating particles is selected from at least one of the first subtype regulating particles, the second subtype regulating particles, the third subtype regulating particles, the fourth subtype regulating particles, and the fifth subtype regulating particles, which have different shapes from each other; and the second type of regulating particles is selected from at least one of the sixth subtype regulating particles, the seventh subtype regulating particles, the eighth subtype regulating particles, the ninth subtype regulating particles, and the tenth subtype regulating particles, which have different shapes from each other.

[0048] Wherein, along the extension direction of the long axis of the first subtype regulating particle, the change value of the diameter of the first circumscribed circle of the first cross section of the first subtype regulating particle is less than or equal to 0.3 micrometers;

[0049] Along the extension direction of the long axis of the second subclass regulating particle, the change value of the diameter of the first circumscribed circle of the first cross section located in the middle portion of the second subclass regulating particle is less than or equal to 1 micron, and in the direction away from the middle portion of the second subclass regulating particle, the diameter of the first circumscribed circle of the first cross section located at the first end portion of the second subclass regulating particle gradually decreases, and the change value of the diameter of the first circumscribed circle of the first cross section located at the second end portion of the second subclass regulating particle is less than or equal to 1 micron;

[0050] Along the extension direction of the long axis of the third subclass regulating particle, the change value of the diameter of the first circumscribed circle of the first cross section located in the middle portion of the third subclass regulating particle is less than or equal to 1 micron, and in the direction away from the middle portion of the third subclass regulating particle, the diameter of the first circumscribed circle of the first cross section located at the first end portion of the third subclass regulating particle gradually decreases, and the diameter of the first circumscribed circle of the first cross section located at the second end portion of the third subclass regulating particle gradually decreases;

[0051] The first end of the fourth subclass regulating particle is connected to the second end of the fourth subclass regulating particle, and the diameter of a first circumscribed circle located at the first cross section of the fourth subclass regulating particle gradually decreases along the direction from the first end of the fourth subclass regulating particle to the second end of the fourth subclass regulating particle;

[0052] The first end of the fifth subclass regulating particle is connected to the second end of the fifth subclass regulating particle, and the diameter of the first circumscribed circle of the first cross-section located at the first end of the fifth subclass regulating particle gradually decreases in a direction away from the second end of the fifth subclass regulating particle, and the diameter of the first circumscribed circle of the first cross-section located at the second end of the fifth subclass regulating particle gradually decreases in a direction away from the first end of the fifth subclass regulating particle;

[0053] Along the extension direction of the long axis of the sixth subclass of regulating particles, a change in the diameter of the second circumscribed circle of the second cross-section of the sixth subclass of regulating particles is less than or equal to 0.3 micrometers;

[0054] The first end of the seventh subclass regulating particle is connected to the second end of the seventh subclass regulating particle, and the diameter of the second circumscribed circle of the second cross-section at the first end of the seventh subclass regulating particle gradually decreases in a direction away from the second end of the seventh subclass regulating particle, and the diameter of the second circumscribed circle of the second cross-section at the second end of the seventh subclass regulating particle gradually decreases in a direction away from the first end of the seventh subclass regulating particle;

[0055] Along the extension direction of the long axis of the eighth subclass regulating particle, the change value of the diameter of the second circumscribed circle of the second cross-section located in the middle portion of the eighth subclass regulating particle is less than or equal to 1 micron, and in the direction away from the middle portion of the eighth subclass regulating particle, the diameter of the second circumscribed circle of the second cross-section located at the first end portion of the eighth subclass regulating particle gradually decreases, and the change value of the diameter of the second circumscribed circle of the second cross-section located at the second end portion of the eighth subclass regulating particle is less than or equal to 1 micron;

[0056] Along the extension direction of the long axis of the ninth subclass regulating particle, the change value of the diameter of the second circumscribed circle of the second cross-section located in the middle portion of the ninth subclass regulating particle is less than or equal to 1 micron, and in the direction away from the middle portion of the ninth subclass regulating particle, the diameter of the second circumscribed circle of the second cross-section located at the first end portion of the ninth subclass regulating particle gradually decreases, and the diameter of the second circumscribed circle of the second cross-section located at the second end portion of the ninth subclass regulating particle gradually decreases;

[0057] The first end of the tenth subclass regulating particle is connected to the second end of the tenth subclass regulating particle, and the diameter of the second circumscribed circle of the second cross-section of the tenth subclass regulating particle gradually decreases along the direction from the first end of the tenth subclass regulating particle to the second end of the tenth subclass regulating particle.

[0058] Preferably, the regulating particles include the first type regulating particles and the second type regulating particles, the mass fraction of the first type regulating particles in the regulating particles is less than 50%, and the mass fraction of the second type regulating particles in the regulating particles is greater than 50%.

[0059] Preferably, the mass fraction of the regulating particles in the substrate is greater than or equal to 0.0001% and less than or equal to 5%, and the tensile strength of the optical film is greater than or equal to 30 MPa and less than or equal to 150 MPa.

[0060] Preferably, the substrate includes a first sublayer, a second sublayer and a third sublayer that are stacked, the first sublayer and the third sublayer are located on opposite sides of the second sublayer, and the dispersion portion is located in at least one of the first sublayer, the second sublayer and the third sublayer.

[0061] Preferably, the dispersion portion is located in the first sub-layer and / or in the third sub-layer.

[0062] Preferably, the dispersion portion is located on a side of the first sub-layer away from the second sub-layer, and / or the dispersion portion is located on a side of the third sub-layer away from the second sub-layer.

[0063] 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.

[0064] 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.

[0065] Preferably, the elongation at break of the optical film is greater than or equal to 1% and less than or equal to 300%.

[0066] Preferably, the breaking strength of the optical film is greater than or equal to 50 N / mm and less than or equal to 500 N / mm, and the thermal shrinkage rate of the optical film is less than 2%.

[0067] The technical solution of this application is now described in conjunction with specific embodiments.

[0068] Please refer to Figures 1 to 4. In this embodiment, the first type of regulating particles 1012a and / or the second type of regulating particles 1012b are dispersed in the dispersion portion 1011a of the substrate 1011. When 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: the distribution range of the first type of regulating particles 1012a in the substrate 1011 is only in the dispersion portion 1011a, that is, the distribution range of the first type of regulating particles 1012 in the substrate 1011 forms the dispersion portion 1011a of the substrate 1011; or the distribution range of the second type of regulating particles 1012b in the substrate 1011 is only in the dispersion portion 1011a. Part 1011a, that is, the second regulating particles 1012 form the dispersed part 1011a of the substrate 1011 in the distribution range 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 in the dispersed part 1011a, that is, the first regulating particles 1012 and the second regulating particles 1012 form the dispersed part 1011a of the substrate 1011 in the distribution range of the substrate 1011.

[0069] In some embodiments, along the thickness direction of the substrate 1011, the substrate 1011 includes a first surface and a second surface disposed opposite to each other. The dispersing portion 1011a includes a first side surface and a second side surface disposed opposite to each other along the thickness direction of the substrate 1011, wherein the first side surface is located on a side of the second side surface closer to the first surface. The thickness of the dispersing portion 1011a is the maximum value of the distance between the first side surface and the second side surface of the dispersing portion 1011a, and the ratio of the thickness of the dispersing portion 1011a to the thickness of the substrate 1011 is greater than or equal to 1:100 and less than 1:1, that is, the ratio of the thickness of the dispersing portion 1011a is the maximum value of the distance between the first side surface and the second side surface of the dispersing portion 1011a to the thickness of the substrate 1011 is greater than or equal to 1:100 and less than 1:1.

[0070] In some embodiments, the ratio of the thickness of the dispersed portion 1011a to the thickness of the substrate 1011 is greater than or equal to 1:100. When the ratio of the thickness of the dispersed portion 1011a to the thickness of the substrate 1011 is less than 1:1, along the thickness direction of the substrate 1011, the dispersed portion 1011a overlaps with a region of the substrate 1011 whose thickness accounts for greater than or equal to 1%, and the dispersed portion 1011a overlaps with a region of the substrate 1011 whose thickness accounts for less than 100%.

[0071] In some embodiments, the thickness of the dispersed portion 1011a is uniformly distributed, that is, the difference between the maximum and minimum values ​​of the distance between the side of the dispersed portion 1011a closer to the first surface and the side of the dispersed portion 1011a closer to the second side does not exceed 5% of the average value of the two values. Furthermore, the side of the dispersed portion closer to the first surface is parallel to the first surface, and the side of the dispersed portion closer to the second surface is parallel to or coincides with the second surface, that is, the maximum and minimum values ​​of the distance between the side of the dispersed portion 1011a closer to the first surface and the side of the dispersed portion 1011a closer to the second side are equal.

[0072] 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.

[0073] In some embodiments, when the dispersing portion 1011a is positioned close to the first surface, the first side surface is coplanar with the first surface; preferably, the first side surface coincides with the first surface. When the dispersing portion 1011a is positioned close to the second surface, the second side surface is coplanar with the second surface; preferably, the second side surface coincides with the second surface.

[0074] In some embodiments, a plane where the first surface is located is parallel to a plane where the second surface is located, the first side surface is parallel to the first surface, and the second side surface is parallel to the second surface.

[0075] In some embodiments, when the first side surface is not coplanar with the first surface, the first side surface is tangential to the regulating particle 1012 closest to the first side surface among the regulating particles 1012 dispersed only within the dispersed portion 1011a. For example, if the first type regulating particles 1012a are dispersed only within the dispersed portion 1011a, the first side surface is tangential to the one of the first type regulating particles 1012a closest to the first side surface; if the second type regulating particles 1012b are dispersed only within the dispersed portion 1011a, the first side surface is tangential to the one of the second type regulating particles 1012b closest to the first side surface; if both the first type regulating particles 1012a and the second type regulating particles 1012b are dispersed only within the dispersed portion 1011a, the first side surface is tangential to the one of the first type regulating particles 1012a and the second type regulating particles 1012b closest to the first side surface.

[0076] In some embodiments, when the second side surface is not coplanar with the second surface, the second side surface is tangential to the regulating particle 1012 closest to the second side surface among the regulating particles 1012 dispersed only within the dispersed portion 1011a. For example, if the first type regulating particles 1012a are dispersed only within the dispersed portion 1011a, the second side surface is tangential to the first type regulating particle 1012a closest to the second side surface; if the second type regulating particles 1012b are dispersed only within the dispersed portion 1011a, the second side surface is tangential to the second type regulating particle 1012b closest to the second side surface; if both the first type regulating particles 1012a and the second type regulating particles 1012b are dispersed only within the dispersed portion 1011a, the second side surface is tangential to the first type regulating particle 1012a and the second type regulating particle 1012b closest to the second side surface.

[0077] In some embodiments, the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is greater than or equal to 1:100. When 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 can 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 dispersed portion 1011a to the thickness of the substrate 1011 is greater than or equal to 1:10, and the ratio of the thickness of the dispersed portion 1011a to the thickness of the substrate 1011 is less than or equal to 9:10, which is beneficial for making the regulating particles 1012 dispersed only in the dispersed portion 1011a closer to the distribution thickness with better optical improvement effect, improving the optical improvement effect of the optical film 101 (such as contrast, chromaticity viewing angle, etc.), thereby improving the display quality of the display device having the optical film 101. More preferably, the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is greater than or equal to 1:4, and the ratio of the thickness of the dispersion portion 1011a to the thickness of the substrate 1011 is less than or equal to 1:2, which is beneficial for making the regulating particles 1012 dispersed only in the dispersion portion 1011a closer to the distribution thickness with better optical improvement effect, improving the optical improvement effect of the optical film 101 (such as contrast, chromaticity viewing angle, etc.), thereby improving the display quality of the display device having the optical film 101.

[0078] In some embodiments, the optical film 101 is formed by a multi-layer co-extrusion process, wherein the optical film 101 is formed by co-extrusion and compounding of multiple optical sub-layers on the same production line to form the optical film 101. Accordingly, the substrate 1011 is formed by co-extrusion and compounding of multiple substrate sub-layers. During the formation of 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 layers of substrate sublayers (for example, the total number of substrate sublayers of the substrate 1011 is M, M is an integer greater than or equal to 2, then the first type of regulating particles 1012a and / or the second type of regulating particles 1012b can be dispersed in a substrate sublayer with a number of layers less than M), so that the distribution thickness of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b in the optical film 101 is less than the thickness of the optical film 101, and the substrate sublayer in which the first type of regulating particles 1012a and / or the second type of regulating particles 1012b are dispersed forms the dispersed portion 1011a, which is beneficial to simplify the manufacturing process while enabling the regulating particles 1012 to better improve the optical properties of the optical film 101 and enhance the display quality of the display device having the optical film 101. For example, the substrate 1011 can be formed by co-extrusion and compounding of three substrate sublayers, wherein the three substrate sublayers are an upper substrate sublayer, a middle substrate sublayer, and a lower substrate sublayer. The first type of regulating particles 1012a can be dispersed in the upper substrate sublayer or the lower substrate sublayer. The upper substrate sublayer, the middle substrate sublayer, and the lower substrate sublayer are co-extruded and compounded to form the optical film 101. In this case, the upper substrate sublayer or the lower substrate sublayer forms the dispersed portion 1011a. When the optical film 101 is applied to a display device, the optical film 101 can be located on the light-emitting side of a display panel of the display device, the upper substrate sublayer is located on the side of the middle substrate sublayer away from the display panel, and the lower substrate sublayer is located on the side of the middle substrate sublayer close to the display panel.

[0079] For example, referring to Figure 5, the substrate 1011 includes a first sublayer 112, a second sublayer 113 and a third sublayer 114 that are stacked, the first sublayer 112 and the third sublayer 114 are located on opposite sides of the second sublayer 113, and the dispersion portion 1011a is located in at least one of the first sublayer 112, the second sublayer 113 and the third sublayer 114.

[0080] Further preferably, the dispersed portion 1011a is located in the first sub-layer 112 and / or the third sub-layer 114. The first sub-layer 112 and the third sub-layer 114 can be considered as the surface layers of the substrate 1011, while the second sub-layer 113 can be considered as the core layer of the substrate 1011. In the embodiment of the present application, the dispersed portion 1011a is disposed in the surface layer of the optical film 10 rather than being distributed in the core layer of the optical film 10. Since the film breaks preferentially in the surface layer during stretching, disposing the regulating particles 1012 in the surface layer in the embodiment of the present application is more conducive to improving the tensile strength of the film.

[0081] In some embodiments, referring to Figure 6, the dispersion portion 1011a is located on a side of the first sub-layer 112 away from the second sub-layer 113, and / or the dispersion portion 1011a is located on a side of the third sub-layer 114 away from the second sub-layer 113; that is, the diffusion particles 1012 can be distributed on a side surface of the first sub-layer 112 away from the second sub-layer 113, or the diffusion particles 1012 can be distributed on a side surface of the third sub-layer 114 away from the second sub-layer 113, or the diffusion particles 1012 can be distributed on a side surface of the first sub-layer 112 away from the second sub-layer 113 and a side surface of the third sub-layer 114 away from the second sub-layer 113; in the embodiment of the present application, distributing the diffusion particles 12 on the outer surface of the optical film 10 can improve the tensile strength of the film layer.

[0082] Please refer to FIG. 5 or FIG. 6 . In the embodiment of the present application, the tensile strength and optical improvement effect of the optical film 10 are improved by differentially setting the performance of the stacked first sub-layer 112 , the second sub-layer 113 and the third sub-layer 114 .

[0083] In some embodiments, the tensile strength of the first sub-layer 112 is greater than the tensile strength of the second sub-layer 113, and the tensile strength of the third sub-layer 114 is greater than the tensile strength of the second sub-layer 113. Since the film breaks preferentially in the surface layer during the stretching process, the embodiment of the present application sets the tensile strength of the first sub-layer 112 and the third sub-layer 114 located on the surface layer to be larger, which is beneficial to improving the tensile strength of the optical film 101.

[0084] In some embodiments, the transmittance of the second sub-layer 113 is greater than the transmittance of the first sub-layer 112, and the transmittance of the second sub-layer 113 is greater than the transmittance of the third sub-layer 114. The embodiment of the present application can compensate for the transmittance loss of the first sub-layer 112 and the third sub-layer 114 due to the doping of the regulating particles 1012 by increasing the transmittance of the second sub-layer 113.

[0085] 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 where the first surface is located, and the acute angle is greater than 0° and the acute angle is less than or equal to 40°. For example, it can be 1°, 2°, 5°, 8°, 10°, 12°, 15°, 18°, 20°, 25°, 28°, 30°, 35°, 38°, etc. When the first type of regulating particles 1012a are dispersed in the dispersion portion 1011a, the distribution thickness of the first type of regulating particles 1012a decreases, and the angle formed between the long axis of the first type of regulating particles 1012a and the plane on which the first surface is located is easier to control and easier to regularize until the acute angle between the long axis of the first type of regulating particles 1012a and the plane on which the first surface is located is less than or equal to 40 degrees. This increases the amount of light scattering by the first type of regulating particles 1012a in a direction parallel to the first surface, thereby enhancing the effect of the first type of regulating particles 1012a on improving the chromaticity, viewing angle, and contrast of the optical film 101. The acute angle being greater than 0° and less than or equal to 20° is conducive to further enhancing the effect of the first type of regulating particles 1012a on improving the chromaticity, viewing angle, and contrast of the optical film 101.

[0086] In some embodiments, the dispersion section 1011a includes a first dispersion sub-section, in which the first type of regulating particles 1012a are dispersed. When the first type of regulating particles 1012a are dispersed only in the dispersion section 1011a and the regulating particles further include the second type of regulating particles 1012b, the dispersion section 1011a further includes a second dispersion sub-section, in which the second type of regulating particles 1012b are dispersed only in the second dispersion sub-section. In the thickness direction of the substrate 1011, the first dispersion sub-section may overlap or be arranged to coincide with the second dispersion sub-section, or the first dispersion sub-section may be arranged separately from the second dispersion sub-section.

[0087] In some embodiments, a side of the first dispersing sub-portion close to the first surface is parallel to the plane where the first surface is located, and a side of the first dispersing sub-portion close to the second surface is parallel to or coincides with the plane where the second surface is located.

[0088] In some embodiments, a side of the second dispersing sub-portion close to the first surface is parallel to the plane where the first surface is located, and a side of the second dispersing sub-portion close to the second surface is parallel to or coincides with the plane where the second surface is located.

[0089] In some embodiments, when the first type of regulating particles 1012a are dispersed in the dispersion portion 1011a and the regulating particles further include the second type of regulating particles 1012b, the second type of regulating particles 1012b may also be dispersed outside the dispersion portion 1011a, and the second type of regulating particles 1012b may be distributed within the substrate 1011. In the thickness direction of the substrate 1011, the ratio of the distribution thickness of the second type of regulating particles 1012b within the substrate 1011 to the thickness of the substrate 1011 is greater than or equal to 1:100 and less than or equal to 1:1.

[0090] When the ratio of the distribution thickness of the second type regulating particles 1012b in the substrate 1011 to the thickness of the substrate 1011 is 1:1, the second type regulating particles 1012b are dispersed outside the dispersion portion 1011a, and the first dispersion sub-portion and the second dispersion sub-portion overlap.

[0091] In some embodiments, the regulating particle 1012 has a long axis and a diameter. The length of the long axis of the regulating particle 1012 is the distance between the two endpoints of the long axis of the regulating particle 1012. Each regulating particle 1012 has multiple cross-sections extending perpendicularly to the long axis of the regulating particle 1012. Each cross-section has a circumscribed circle. The diameter of the regulating particle 1012 corresponds to the diameter of the circumscribed circle with the largest diameter among the multiple cross-sections. The two most distant points in a cross-section of the regulating particle 1012 are located on the circumscribed circle of the cross-section, and the distance between the two most distant points in the cross-section is the diameter of the circumscribed circle.

[0092] In some embodiments, the regulating particles 1012 include first-type regulating particles 1012a, which reduce the rainbow stripe problem of the optical film 101 while improving the chromaticity, viewing angle, and contrast of the optical film 101. The first-type regulating particles 1012a have multiple first cross-sections, each of which has a first circumscribed circle. The ratio of the major axis length of the first-type regulating particle 1012a to the diameter of the first circumscribed circle with the largest diameter among the multiple first circumscribed circles is greater than or equal to 5, and the ratio of the major axis length of the first-type regulating particle 1012a to the diameter of the first circumscribed circle with the largest diameter among the multiple first circumscribed circles is less than 50. The first cross-section is perpendicular to the extension direction of the major axis of the first-type regulating particle 1012a, and can be, for example, 10, 12, 15, 16, 18, 20, 30, 32, 34, 35, 36, 38, 40, 42, 45, 46, 48, etc. The diameter of the first circumscribed circle of the first cross-section of the first-type regulating particle 1012a is the distance between the two most distant points in the first cross-section. Using first-type regulating particles 1012a with a larger aspect ratio (the ratio of the major axis length to the diameter of the first circumscribed circle with the largest diameter) allows more light to pass through the regulating particle 1012 and change its propagation direction, thereby facilitating the improvement of chromaticity, viewing angle, and contrast achieved by the regulating particle 1012.

[0093] In some embodiments, the first type of regulating particles 1012a are selected from at least one of the first subtype regulating particles, the second subtype regulating particles, the third subtype regulating particles, the fourth subtype regulating particles, and the fifth subtype regulating particles, which have different shapes.

[0094] Wherein, along the direction of extension of the long axis of the first subclass of regulating particles, the change value of the diameter of the first circumscribed circle of the first cross section of the first subclass of regulating particles is less than or equal to 0.3 micrometers, for example, can be 0 micrometers, 0.28 micrometers, 0.25 micrometers, 0.22 micrometers, 0.2 micrometers, 0.18 micrometers, 0.15 micrometers, 0.12 micrometers, 0.1 micrometers, 0.08 micrometers, 0.05 micrometers, 0.02 micrometers, etc. In some embodiments, along the direction of extension of the long axis of the first subclass of regulating particles, the diameter of the first circumscribed circle of the first cross section at the first end of the first subclass of regulating particles is the same as the diameter of the first circumscribed circle of the first cross section at the middle portion of the first subclass of regulating particles, and the diameter of the first circumscribed circle at the second end of the first subclass of regulating particles is the same as the diameter of the first circumscribed circle at the middle portion of the first subclass of regulating particles.

[0095] In some embodiments, the first cross-section of the first subtype regulating particles can be a regular shape such as a circle, an ellipse, a triangle, a quadrilateral, or an irregular shape.

[0096] In some embodiments, the first subclass of regulating particles may be rod-shaped particles. When the first subclass of regulating particles is rod-shaped, the first cross-section of the first subclass of regulating particles is circular or elliptical. When the first cross-section of the first subclass of regulating particles is circular, the first circumscribed circle of the first cross-section of the first subclass of regulating particles may coincide with the first cross-section. When the first cross-section of the first subclass of regulating particles is elliptical, the diameter of the first circumscribed circle of each of the first cross-sections of the first subclass of regulating particles is the length of the major axis of the ellipse presented by each of the first cross-sections of the first subclass of regulating particles. The ratio of the major axis of the ellipse presented by the first cross-section of a first subclass of regulating particles to the minor axis of the ellipse presented by the first cross-section of the first subclass of regulating particles is greater than 1 and less than or equal to 3, for example, it may be 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0097] Along the extension direction of the long axis of the second subclass regulating particles, the change value of the diameter of the first circumscribed circle of the first cross-section located in the middle part of the second subclass regulating particles is less than or equal to 1 micron, for example, it can be 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, 0.35 micron, 0.32 micron, 0.3 micron, 0.28 micron, 0.25 micron, 0.22 micron, 0.2 micron, 0.18 micron, 0.15 micron, 0.12 micron, 0.1 micron, 0.08 micron, 0.05 micron, 0.02 micron, etc. In the direction away from the middle part of the second subclass regulating particle, the diameter of the first circumscribed circle of the first cross section at the first end of the second subclass regulating particle gradually decreases, and the change value of the diameter of the first circumscribed circle of the first cross section at the second end of the second subclass regulating particle is less than or equal to 1 micron, for example, can be 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. .1 μm, 0.08 μm, 0.05 μm, 0.02 μm, etc. In some embodiments, the diameter of the first circumscribed circle of the first cross section at the first end of the second subclass of regulating particles gradually decreases in a direction away from the middle portion of the second subclass of regulating particles, and the diameter of the first circumscribed circle of the first cross section at the second end of the second subclass of regulating particles is the same as the diameter of the first circumscribed circle of the first cross section at the middle portion of the second subclass of regulating particles.

[0098] It can be understood that the diameter of the first circumscribed circle of the first cross-section located at the first end of the second subclass regulating particle gradually decreases in the direction away from the middle part of the second subclass regulating particle, indicating that in the direction away from the middle part of the second subclass regulating particle, the diameter of the first circumscribed circle of the first cross-section located at the first end of the second subclass regulating particle shows a decreasing trend, including but not limited to the diameter of the first circumscribed circle of the first cross-section located at the first end of the second subclass regulating particle gradually decreasing in the direction away from the middle part of the second subclass regulating particle.

[0099] In some embodiments, the first cross-section of the second subtype regulating particles can be a regular shape such as a circle, an ellipse, a triangle, a quadrilateral, or an irregular shape.

[0100] In some embodiments, the second subtype of regulating particles may be needle-shaped particles with a reduced diameter at one end.

[0101] In some embodiments, when the second subclass of regulating particles is a needle-shaped particle with a reduced diameter at one end, the first cross-section of the second subclass of regulating particles may be circular or elliptical. When the first cross-section at the second end of the second subclass of regulating particles or the first cross-section at the middle of the second subclass of regulating particles is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse at either the first cross-section at the second end or the middle of the second subclass of regulating particles is 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. The shape of the first cross-section at the first end of the second subclass of regulating particles is consistent with the shape of the first cross-section at the middle of the second subclass of regulating particles, and the area gradually decreases away from the middle of the second subclass of regulating particles.

[0102] Along the extension direction of the long axis of the third subclass regulating particles, the change value of the diameter of the first circumscribed circle of the first cross section located in the middle part of the third subclass regulating particles is less than or equal to 1 micron, for example, it can be 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. In some embodiments, the diameter of the first circumscribed circle of the first cross section at the first end of the third subclass regulating particle gradually decreases as the distance from the middle of the third subclass regulating particle is gradually reduced, and the diameter of the first circumscribed circle of the first cross section at the second end of the third subclass regulating particle gradually decreases. In some embodiments, along the extension direction of the long axis of the third subclass regulating particle, the diameter of the first circumscribed circle of the first cross section at the middle of the third subclass regulating particle is uniform, and the diameters of the first circumscribed circles of the first cross section at the first end of the third subclass regulating particle and the second end of the third subclass regulating particle gradually change.

[0103] It can be understood that the diameter of the first circumscribed circle of the first cross-section located at the first end of the third subclass regulating particle gradually decreases in the direction away from the middle part of the third subclass regulating particle, indicating that the diameter of the first circumscribed circle of the first cross-section located at the first end of the third subclass regulating particle shows a decreasing trend in the direction away from the middle part of the third subclass regulating particle, including but not limited to the diameter of the first circumscribed circle of the first cross-section located at the first end of the third subclass regulating particle decreasing successively in the direction away from the middle part of the third subclass regulating particle.

[0104] It can be understood that the diameter of the first circumscribed circle of the first cross-section located at the second end of the third subclass regulating particle gradually decreases in the direction away from the middle part of the third subclass regulating particle, indicating that in the direction away from the middle part of the third subclass regulating particle, the diameter of the first circumscribed circle of the first cross-section located at the second end of the third subclass regulating particle shows a decreasing trend, including but not limited to the diameter of the first circumscribed circle of the first cross-section located at the second end of the third subclass regulating particle gradually decreasing in the direction away from the middle part of the third subclass regulating particle.

[0105] In some embodiments, the first cross-section of the third subtype regulating particles can be a regular shape such as a circle, an ellipse, a triangle, a quadrilateral, or an irregular shape.

[0106] In some embodiments, the third subtype of regulating particles may be needle-shaped particles with decreasing diameters at both ends.

[0107] In some embodiments, when the third subclass of regulating particles is a needle-shaped particle with a decreasing diameter at both ends, the first cross-section of the third subclass of regulating particles may be circular or elliptical. When the first cross-section located in the middle of the third subclass of regulating particles is elliptical, the ratio of the major axis of the ellipse to the minor axis of any first cross-section located in the middle of the third subclass of regulating particles is 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. The first cross-sections located at the first end and the second end of the third subclass of regulating particles have the same shape as the first cross-section located in the middle of the third subclass of regulating particles, and their areas gradually decrease away from the middle of the third subclass of regulating particles.

[0108] The first end of the fourth subclass regulating particle is connected to the second end of the fourth subclass regulating particle, and the diameter of the first circumscribed circle of the first cross-section of the fourth subclass regulating particle gradually decreases along the direction from the first end of the fourth subclass regulating particle to the second end of the fourth subclass regulating particle.

[0109] It can be understood that, along the direction from the second end of the fourth subclass regulating particle to the second end of the fourth subclass regulating particle, the diameter of the first circumscribed circle of the ninth cross-section of the fourth subclass regulating particle gradually decreases, indicating that in the direction from the first end of the fourth subclass regulating particle to the second end of the fourth subclass regulating particle, the diameter of the first circumscribed circle of the first cross-section of the fourth subclass regulating particle shows a decreasing trend, including but not limited to in the direction from the first end of the fourth subclass regulating particle to the second end of the fourth subclass regulating particle, the diameter of the first circumscribed circle of the first cross-section of the fourth subclass regulating particle decreases successively.

[0110] In some embodiments, the first cross-section of the fourth subtype regulating particles can be a regular shape such as a circle, an ellipse, a triangle, a quadrilateral, or an irregular shape.

[0111] In some embodiments, the fourth subclass of regulating particles can be long tapered particles.

[0112] In some embodiments, when the fourth subclass of regulating particles is a long conical particle, the first cross-section of the fourth subclass of regulating particles is circular or elliptical. Along the direction from the first end of the fourth subclass of regulating particles to the second end of the fourth subclass of regulating particles, the shape of the first cross-section of the fourth subclass of regulating particles is consistent and the area gradually decreases. When the first cross-section of the fourth subclass of regulating particles is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse presented by any first cross-section of the fourth subclass of regulating particles is greater than 1 and less than or equal to 3, for example, it can be 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0113] The first end of the fifth subclass regulating particle is connected to the second end of the fifth subclass regulating particle, and the diameter of the first circumscribed circle of the first cross-section located at the first end of the fifth subclass regulating particle gradually decreases in the direction away from the second end of the fifth subclass regulating particle, and the diameter of the first circumscribed circle of the first cross-section located at the second end of the fifth subclass regulating particle gradually decreases in the direction away from the first end of the fifth subclass regulating particle.

[0114] It can be understood that the diameter of the first circumscribed circle of the first cross-section located at the first end of the fifth subclass regulating particle gradually decreases in the direction away from the second end of the fifth subclass regulating particle, indicating that in the direction away from the second end of the fifth subclass regulating particle, the diameter of the first circumscribed circle of the first cross-section located at the first end of the fifth subclass regulating particle shows a decreasing trend, including but not limited to the diameter of the first circumscribed circle of the first cross-section located at the first end of the fifth subclass regulating particle decreasing successively in the direction away from the second end of the fifth subclass regulating particle.

[0115] It can be understood that the diameter of the first circumscribed circle of the first cross-section located at the second end of the fifth subclass regulating particle gradually decreases in the direction away from the first end of the fifth subclass regulating particle, indicating that in the direction away from the first end of the fifth subclass regulating particle, the diameter of the first circumscribed circle of the first cross-section located at the second end of the fifth subclass regulating particle shows a decreasing trend, including but not limited to the diameter of the first circumscribed circle of the first cross-section located at the second end of the fifth subclass regulating particle decreasing successively in the direction away from the first end of the fifth subclass regulating particle.

[0116] In some embodiments, the first cross-section of the fifth subtype regulating particles can be a regular shape such as a circle, an ellipse, a triangle, a quadrilateral, or an irregular shape.

[0117] In some embodiments, the fifth subtype of regulating particles can be biconical particles and / or ellipsoidal particles.

[0118] In some embodiments, when the fifth subclass of regulating particles is a biconical particle and / or an ellipsoidal particle, the first cross-section of the fifth subclass of regulating particles is circular or elliptical. Along the direction away from the second end of the fifth subclass of regulating particles, the shape of the first cross-section at the first end of the fifth subclass of regulating particles is consistent and the area gradually decreases; along the direction away from the first end of the fifth subclass of regulating particles, the shape of the first cross-section at the second end of the fifth subclass of regulating particles is consistent and the area gradually decreases. When the first cross-section of the fifth subclass of regulating particles is elliptical, the ratio of the major axis of the ellipse presented by any first cross-section of the fifth subclass of regulating particles to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, it can be 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0119] The difference between the fifth subclass regulating particles being biconical particles and ellipsoidal particles is that when the fifth subclass regulating particles are biconical particles, the cross-section of the fifth subclass regulating particles in the direction parallel to the long axis of the fifth subclass regulating particles is a polygon such as a triangle or a quadrilateral; when the fifth subclass regulating particles are ellipsoidal particles, the cross-section of the fifth subclass regulating particles in the direction parallel to the long axis of the fifth subclass regulating particles is an ellipse.

[0120] In some embodiments, the long axis length of the first type of regulating particles 1012a is greater than or equal to 1 micron, and the long axis length of the first type of regulating particles 1012a is less than or equal to 200 microns. For example, it can be 5 microns, 10 microns, 50 microns, 60 microns, 70 microns, 80 microns, 90 microns, 100 microns, 120 microns, 150 microns, 180 microns, etc., so as to effectively improve the chromaticity and viewing angle of the optical film 101 while reducing the rainbow stripe problem of the optical film 101. Preferably, the long axis length of the first type of regulating particles 1012a is greater than or equal to 40 microns, and the long axis length of the first type of regulating particles 1012a is less than or equal to 100 microns, so that the size of the first type of regulating particles 1012a is more concentrated, which is conducive to further comprehensive improvement of the optical performance of the optical film 101.

[0121] In some embodiments, the regulating particles 1012 include a second type of regulating particles 1012b.

[0122] In some embodiments, the second type of regulating particle 1012b has multiple second cross-sections, each of the second cross-sections has a second circumscribed circle, the ratio of the long axis length of the second type regulating particle 1012b to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is greater than or equal to 1, and the ratio of the long axis length of the second type regulating particle 1012b to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is less than 5, for example, it can be 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-section is perpendicular to the extension direction of the long axis of the first type regulating particle 1012a. By making the regulating particles 1012 include the second type of regulating particles 1012b with a smaller aspect ratio (the ratio of the major axis length to the diameter of the second circumscribed circle with the largest diameter), it is beneficial to effectively reduce the in-plane retardation value of the optical film 101 to below 3000 nanometers, and it is beneficial to effectively reduce the difference between the in-plane retardation value of the optical film 101 and the thickness direction retardation value of the optical film 101, improve the rainbow pattern problem of the optical film 101, and enhance the display quality of the display device having the optical film 101.

[0123] In some embodiments, the second type of regulation particles 1012b are selected from at least one of the sixth subtype of regulation particles, the seventh subtype of regulation particles, the eighth subtype of regulation particles, the ninth subtype of regulation particles, and the tenth subtype of regulation particles, which have different shapes.

[0124] Wherein, along the extension direction of the long axis of the sixth subclass of regulating particles, the change value of the diameter of the second circumscribed circle of the second cross-section of the sixth subclass of regulating particles is less than or equal to 0.3 micrometers. For example, it can be 0 micrometers, 0.28 micrometers, 0.25 micrometers, 0.22 micrometers, 0.2 micrometers, 0.18 micrometers, 0.15 micrometers, 0.12 micrometers, 0.1 micrometers, 0.08 micrometers, 0.05 micrometers, 0.02 micrometers, etc. In some embodiments, along the extension direction of the long axis of the sixth subclass of regulating particles, the diameter of the second circumscribed circle of the second cross-section at the first end of the sixth subclass of regulating particles is the same as the diameter of the second circumscribed circle of the second cross-section at the middle of the sixth subclass of regulating particles, and the diameter of the second circumscribed circle of the second cross-section at the second end of the sixth subclass of regulating particles is the same as the diameter of the second circumscribed circle of the second cross-section at the middle of the sixth subclass of regulating particles.

[0125] In some embodiments, the second cross-section of the sixth subtype regulating particles can be a regular shape such as a circle, an ellipse, a triangle, a quadrilateral, or an irregular shape.

[0126] In some embodiments, the sixth subclass regulating particles are cubic particles or rectangular particles, the second cross-section of the sixth subclass regulating particles is a square or a rectangle, and the diameter of the second circumscribed circle of any second cross-section of the sixth subclass regulating particles is the diagonal length of the square or rectangle of the second cross-section.

[0127] The ratio of the long axis length of the sixth subclass regulating particle to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles of the sixth subclass regulating particle is more preferably close to 1, for example, it can be 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.

[0128] The first end of the seventh subclass regulating particle is connected to the second end of the seventh subclass regulating particle, and the diameter of the second circumscribed circle of the second cross-section located at the first end of the seventh subclass regulating particle gradually decreases in the direction away from the second end of the seventh subclass regulating particle, and the diameter of the second circumscribed circle of the second cross-section located at the second end of the seventh subclass regulating particle gradually decreases in the direction away from the first end of the seventh subclass regulating particle.

[0129] It can be understood that the diameter of the second circumscribed circle of the second cross-section located at the first end of the seventh subclass regulating particle gradually decreases in the direction away from the second end of the seventh subclass regulating particle, indicating that the diameter of the second circumscribed circle of the second cross-section located at the first end of the seventh subclass regulating particle shows a decreasing trend in the direction away from the second end of the seventh subclass regulating particle, including but not limited to the diameter of the second circumscribed circle of the second cross-section located at the first end of the seventh subclass regulating particle decreasing successively in the direction away from the second end of the seventh subclass regulating particle.

[0130] It can be understood that the diameter of the second circumscribed circle of the second cross-section located at the second end of the seventh subclass regulating particle gradually decreases in the direction away from the first end of the seventh subclass regulating particle, indicating that in the direction away from the first end of the seventh subclass regulating particle, the diameter of the second circumscribed circle of the second cross-section located at the second end of the seventh subclass regulating particle shows a decreasing trend, including but not limited to the diameter of the second circumscribed circle of the second cross-section located at the second end of the seventh subclass regulating particle decreasing successively in the direction away from the first end of the seventh subclass regulating particle.

[0131] In some embodiments, the second cross-section of the seventh subtype regulating particles can be a regular shape such as a circle, an ellipse, a triangle, a quadrilateral, or an irregular shape.

[0132] In some embodiments, the seventh subclass of regulating particles is a spherical particle or an ellipsoidal particle, and the second cross-section of the seventh subclass of regulating particles is circular or elliptical. When the second cross-section of the seventh subclass of regulating particles is elliptical, the ratio of the major axis of the ellipse presented by any second cross-section of the seventh subclass of regulating particles to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, it can be 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. When the seventh subclass of regulating particles is a spherical particle, any second cross-section of the seventh subclass of regulating particles is circular and the second circumscribed circle of any second cross-section coincides with the second cross-section, and the ratio of the major axis of the seventh subclass of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second cross-sections of the seventh subclass of regulating particles is 1.

[0133] The ratio of the major axis length of the seventh subclass regulating particle to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles of the seventh subclass regulating particle is preferably close to 1; when the seventh subclass regulating particle is an ellipsoidal particle, its shape is more preferably close to a spherical particle, that is, the closer the major axis length of the seventh subclass regulating particle is to the diameter of the seventh subclass regulating particle, the better. Preferably, the ratio of the long axis length of the seventh subclass regulating particle to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles of the seventh subclass regulating particle is greater than or equal to 1, and the ratio of the long axis length of the seventh subclass regulating particle to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles of the seventh subclass regulating particle is less than or equal to 3; more preferably, the ratio of the long axis length of the seventh subclass regulating particle to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles of the seventh subclass regulating particle is greater than or equal to 1, and the ratio of the long axis length of the seventh subclass regulating particle to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles of the seventh subclass regulating particle is less than or equal to 1.5.

[0134] Along the extension direction of the long axis of the eighth subclass regulating particles, the change value of the diameter of the second circumscribed circle of the second cross-section located in the middle part of the eighth subclass regulating particles is less than or equal to 1 micron, for example, it can be 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, 0.35 micron, 0.32 micron, 0.3 micron, 0.28 micron, 0.25 micron, 0.22 micron, 0.2 micron, 0.18 micron, 0.15 micron, 0.12 micron, 0.1 micron, 0.08 micron, 0.05 micron, 0.02 micron, etc. In the direction away from the middle part of the eighth subclass regulating particle, the diameter of the second circumscribed circle of the second cross section at the first end of the eighth subclass regulating particle gradually decreases, and the change value of the diameter of the first circumscribed circle of the second cross section at the second end of the eighth subclass regulating particle is less than or equal to 1 micron, for example, can be 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. .1 μm, 0.08 μm, 0.05 μm, 0.02 μm, etc. In some embodiments, the diameter of the second circumscribed circle of the second cross section at the first end of the eighth subclass of regulating particles gradually decreases in a direction away from the middle portion of the eighth subclass of regulating particles, and the diameter of the second circumscribed circle of the second cross section at the second end of the eighth subclass of regulating particles is the same as the diameter of the second circumscribed circle of the second cross section at the middle portion of the eighth subclass of regulating particles.

[0135] It can be understood that the diameter of the second circumscribed circle of the second cross-section located at the first end of the eighth subclass regulating particle gradually decreases in the direction away from the middle part of the eighth subclass regulating particle, indicating that in the direction away from the middle part of the eighth subclass regulating particle, the diameter of the second circumscribed circle of the second cross-section located at the first end of the eighth subclass regulating particle shows a decreasing trend, including but not limited to the diameter of the second circumscribed circle of the second cross-section located at the first end of the eighth subclass regulating particle gradually decreasing in the direction away from the middle part of the eighth subclass regulating particle.

[0136] In some embodiments, the second cross-section of the eighth subtype regulating particles can be a regular shape such as a circle, an ellipse, a triangle, a quadrilateral, or an irregular shape.

[0137] In some embodiments, the eighth subtype of regulating particles can be needle-shaped particles with a reduced diameter at one end.

[0138] In some embodiments, when the eighth subclass of regulating particles is a needle-shaped particle with a reduced diameter at one end, the second cross-section of the eighth subclass of regulating particles may be circular or elliptical. When the second cross-section at the second end of the eighth subclass of regulating particles or the second cross-section at the middle of the eighth subclass of regulating particles is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse at either the second cross-section at the second end or the middle of the eighth subclass of regulating particles is 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. The shape of the second cross-section at the first end of the eighth subclass of regulating particles is consistent with the shape of the second cross-section at the middle of the eighth subclass of regulating particles, and the area gradually decreases away from the middle of the eighth subclass of regulating particles.

[0139] Along the extension direction of the long axis of the ninth subclass regulating particle, the change value of the diameter of the second circumscribed circle of the second cross section located in the middle part of the ninth subclass regulating particle is less than or equal to 1 micron, for example, it can be 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. In some embodiments, the diameter of the second circumscribed circle of the second cross section at the first end of the ninth subclass regulating particle gradually decreases as the distance from the middle portion of the ninth subclass regulating particle is gradually reduced, and the diameter of the second circumscribed circle of the second cross section at the second end of the ninth subclass regulating particle gradually decreases. In some embodiments, along the extension direction of the long axis of the ninth subclass regulating particle, the diameter of the second circumscribed circle of the second cross section at the middle portion of the ninth subclass regulating particle is uniform, and the diameters of the second circumscribed circles of the second cross section at the first end of the ninth subclass regulating particle and the second end of the ninth subclass regulating particle gradually change.

[0140] It can be understood that the diameter of the second circumscribed circle of the second cross-section located at the first end of the ninth subclass regulating particle gradually decreases in the direction away from the middle part of the ninth subclass regulating particle, indicating that the diameter of the second circumscribed circle of the second cross-section located at the first end of the ninth subclass regulating particle shows a decreasing trend in the direction away from the middle part of the ninth subclass regulating particle, including but not limited to the diameter of the second circumscribed circle of the second cross-section located at the first end of the ninth subclass regulating particle decreasing successively in the direction away from the middle part of the ninth subclass regulating particle.

[0141] It can be understood that the diameter of the second circumscribed circle of the second cross-section located at the second end of the ninth subclass regulating particle gradually decreases in the direction away from the middle part of the ninth subclass regulating particle, indicating that the diameter of the second circumscribed circle of the second cross-section located at the second end of the ninth subclass regulating particle shows a decreasing trend in the direction away from the middle part of the ninth subclass regulating particle, including but not limited to the diameter of the second circumscribed circle of the second cross-section located at the second end of the ninth subclass regulating particle decreasing successively in the direction away from the middle part of the ninth subclass regulating particle.

[0142] In some embodiments, the second cross-section of the ninth subclass of regulating particles can be a regular shape such as a circle, an ellipse, a triangle, a quadrilateral, or an irregular shape.

[0143] In some embodiments, the ninth subtype of regulating particles may be needle-shaped particles with decreasing diameters at both ends.

[0144] In some embodiments, when the ninth subclass of regulating particles is a needle-shaped particle with a decreasing diameter at both ends, the second cross-section of the ninth subclass of regulating particles may be circular or elliptical. When the second cross-section located in the middle of the ninth subclass of regulating particles is elliptical, the ratio of the major axis to the minor axis of the ellipse of any second cross-section located in the middle of the ninth subclass of regulating particles is 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. The second cross-sections located at the first end and the second end of the ninth subclass of regulating particles are consistent with the second cross-section located in the middle of the ninth subclass of regulating particles, and their area gradually decreases away from the middle of the ninth subclass of regulating particles.

[0145] The first end of the tenth subclass regulating particle is connected to the second end of the tenth subclass regulating particle, and the diameter of the second circumscribed circle of the second cross-section of the tenth subclass regulating particle gradually decreases along the direction from the first end of the tenth subclass regulating particle to the second end of the tenth subclass regulating particle.

[0146] It can be understood that, along the direction from the first end of the tenth subclass regulating particle to the second end of the tenth subclass regulating particle, the diameter of the second circumscribed circle of the second cross-section of the tenth subclass regulating particle gradually decreases, indicating that in the direction from the first end of the tenth subclass regulating particle to the second end of the tenth subclass regulating particle, the diameter of the second circumscribed circle of the second cross-section of the tenth subclass regulating particle shows a decreasing trend, including but not limited to, in the direction from the first end of the tenth subclass regulating particle to the second end of the tenth subclass regulating particle, the diameter of the second circumscribed circle of the second cross-section of the tenth subclass regulating particle decreases successively.

[0147] In some embodiments, the second cross-section of the tenth subclass of regulating particles can be a regular shape such as a circle, an ellipse, a triangle, a quadrilateral, or an irregular shape.

[0148] In some embodiments, the tenth subclass of regulatory particles can be long conical particles.

[0149] In some embodiments, when the tenth subclass of regulating particles is a long conical particle, the second cross-section of the tenth subclass of regulating particles is circular or elliptical. Along the direction from the first end of the tenth subclass of regulating particles to the second end of the tenth subclass of regulating particles, the shape of the second cross-section of the tenth subclass of regulating particles is consistent and the area gradually decreases. When the second cross-section of the tenth subclass of regulating particles is elliptical, the ratio of the major axis of the ellipse presented by any second cross-section of the tenth subclass of regulating particles to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, it can be 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0150] In some embodiments, the sixth subclass of regulating particles and the seventh subclass of regulating particles have a better improvement effect on reducing the difference between the in-plane retardation value of the optical film 101 and the thickness direction retardation value of the optical film 101 than the eighth subclass of regulating particles, the ninth subclass of regulating particles, and the tenth subclass of regulating particles, and the improvement effect of the seventh subclass of regulating particles is better than that of the sixth subclass of regulating particles. Therefore, preferably, the regulating particles 1012 include the sixth subclass of regulating particles and / or the seventh subclass of regulating particles. When the regulating particles 1012 include the sixth subclass of regulating particles and the seventh subclass of regulating particles, the mass fraction of the sixth subclass of regulating particles in the regulating particles 1012 is greater than the mass fraction of the seventh subclass of regulating particles in the regulating particles 1012. Preferably, the second class of regulating particles 1012b is composed of the seventh subclass of regulating particles and / or the sixth subclass of regulating particles. More preferably, the second class of regulating particles 1012b is composed of the seventh subclass of regulating particles.

[0151] In some embodiments, the regulating particles 1012 include the first type regulating particles 1012a and the second type regulating particles 1012b, so as to improve the rainbow pattern problem caused by the optical film 101 while improving the chromaticity viewing angle and contrast improvement effect of the optical film 101, thereby improving the display quality of the display device having the optical film 101.

[0152] In some embodiments, the first type of regulating particles 1012a have a slightly weaker effect on 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 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 and 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 less 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 regulating particles 1012b in the regulating particles 1012 can be 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 99%, etc.

[0153] In some embodiments, when the regulating particles 1012 include the second type of regulating particles 1012b and the first type of regulating particles 1012a, and the second type of regulating particles 1012b include the sixth subclass of regulating particles and the seventh subclass of regulating particles, the mass fraction of the seventh subclass of regulating particles in the regulating particles 1012 is greater than the mass fraction of the sixth subclass of regulating particles in the regulating particles 1012, and the mass fraction of the sixth subclass of regulating particles in the regulating particles 1012 is greater than or equal to the mass fraction of the first type of regulating particles 1012a in the regulating particles 1012.

[0154] In some embodiments, the mass fraction of the sixth subclass of regulating particles in the regulating particles 1012 is greater than or equal to 50%, for example, 55%, 60%, 70%, 75%, 80%, 85%, 90%, 95%, 99%, 100%, etc. The mass fraction of the seventh subclass of regulating particles in the regulating particles 1012 is less than or equal to 25%, for example, 20%, 15%, 10%, 5%, 3%, 1%, 0%, etc. The mass fraction of the first subclass of regulating particles 1012a in the regulating particles 1012 is less than or equal to 25%, for example, 20%, 15%, 10%, 5%, 3%, 1%, 0%, etc.

[0155] In some embodiments, the first type of regulating particles 1012a is selected from at least two of the first sub-type regulating particles, the second sub-type regulating particles, the third sub-type regulating particles, the fourth sub-type regulating particles, and the fifth sub-type regulating particles. Preferably, the first type of regulating particles 1012a is a mixture of the first sub-type regulating particles, the second sub-type regulating particles, and the third sub-type regulating particles, or the first type of regulating particles 1012a is a mixture of the first sub-type regulating particles, the fourth sub-type regulating particles, and the fifth sub-type regulating particles. Alternatively, the first type of regulating particles 1012a is a mixture of the first sub-type regulating particles, the second sub-type regulating particles, the third sub-type regulating particles, the fourth sub-type regulating particles, and the fifth sub-type regulating particles. By selecting the first type of regulating particles 1012a from at least two particles with different shapes, the shape diversity 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 enhancement effect of the first type of regulating particles 1012a is improved. The first type of regulating particles 1012a is selected from the first subtype regulating particles, the second subtype regulating particles and the third subtype regulating particles, or the first type of regulating particles 1012a is selected from the first subtype regulating particles, the fourth subtype regulating particles and the fifth subtype regulating particles, or the first type of regulating particles 1012a is a mixture of the first subtype regulating particles, the second subtype regulating particles, the third subtype regulating particles, the fourth subtype regulating particles and the fifth subtype regulating particles, the mass fraction of the first subtype regulating particles in the first type of regulating particles 1012a is 1% to 8%, for example, it can be 1.5%, 2%, 2.5%. , 3%, 3.5%, 4%, 4.5%, 5%, 6%, 6.5%, 7%, 7.5%, etc.; the mass fraction of the second subclass regulating particles and / or the fourth subclass regulating particles in the first class regulating particles 1012a is 40% to 50%, for example, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, etc.; the mass fraction of the third subclass regulating particles and / or the fifth subclass regulating particles in the first class regulating particles 1012a is 45% to 55%, for example, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, etc. By mixing the first subclass regulating particles, the second subclass regulating particles and / or the fourth subclass regulating particles, the third subclass regulating particles and / or the fifth subclass regulating particles in the first class regulating particles 1012a in the above proportions, it is helpful to further improve the contrast and brightness enhancement effect of the obtained regulating particles 1012.

[0156] In some embodiments, the mass fraction of the regulating particles 1012 in the optical film 101 is less than or equal to 20%, for example, 0.0001%, 0.001%, 0.01%, 0.02%, 0.05%, 0.1%, 0.5%, 1%, 5%, 8%, 10%, 12%, 15%, 18%, etc., so as to be uniformly dispersed in the optical film 101 and effectively improve the rainbow stripe problem of the optical film 101 at large angles, thereby improving the display quality of a display device having the optical film 101. A smaller mass fraction of the regulating particles 1012 in the optical film 101 can effectively reduce the rainbow stripes of the optical film 101 at large angles, and the smaller the mass fraction, the better the dispersibility. Preferably, the mass fraction of the regulating particles 1012 in the optical film 101 is less than or equal to 10%; further preferably, the mass fraction of the regulating particles 1012 in the optical film 101 is less than or equal to 5%; more preferably, the mass fraction of the regulating particles 1012 in the optical film 101 is less than or equal to 1%; further preferably, the mass fraction of the regulating particles 1012 in the optical film 101 is less than or equal to 0.05%. At the same time, in order to ensure that the amount of the regulating particles 1012 in the optical film 101 is sufficient to effectively improve the rainbow pattern of the optical film 101 at large angles, the mass fraction of the regulating particles 1012 in the optical film 101 can be greater than or equal to 0.0001%. Further, the mass fraction of the regulating particles 1012 in the optical film 101 can be greater than or equal to 0.001%, preferably greater than or equal to 0.003%, more preferably greater than or equal to 0.005%, further preferably greater than or equal to 0.015%, and further preferably greater than or equal to 0.03%.

[0157] In some embodiments, the first type of regulating particles 1012a are whiskers. The material of the second type of regulating particles 1012b and the material of the first type of regulating particles 1012a are at least one selected from silicon dioxide, silicon carbide, silicon nitride, zinc oxide, magnesium oxide, aluminum oxide, calcium sulfate, calcium carbonate, potassium titanate, and aluminum borate.

[0158] 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 dispersibility of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b in the substrate 1011, or to enhance the toughness and other functional properties 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 surface of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b is modified with at least one of an inorganic cation, an inorganic anion, a polymer, a coupling agent, or a surfactant, i.e., the surface of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b includes at least one of an inorganic cation group, an inorganic anion group, a polymer group, a coupling agent group, or a surfactant group.

[0159] Specifically, the surfaces of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b are modified by at least one selected from magnesium chloride, calcium chloride, barium chloride, strontium chloride, stearic acid, sodium stearate, zinc octadecanoate, sulfonic acid surfactants, thio surfactants, titanates, aluminates, polyacrylamides, silanes, alkyl phosphates, aryl phosphates, alkyl phosphates, aryl phosphates, alkylolamide phosphates, alkylolamide phosphates, imidazoline phosphates, imidazoline phosphates, high polyphosphates, high polyphosphates, and siloxane phosphates. Preferably, the surfaces of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b are modified by at least one selected from sulfonic acid surfactants or thio surfactants. The sulfonic acid surfactant can be selected from at least one of alkyl sulfonates and fluoroalkyl sulfonates, specifically, such as at least one of sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, and sodium fluorododecyl sulfonate; the thio surfactant can be selected from at least one of thiols and fluorothiols, specifically, such as at least one of octyl mercaptan, dodecanethiol, tetradecyl mercaptan, octadecanethiol, fluorooctyl mercaptan, and fluorododecyl mercaptan. When the sulfonic acid surfactant is mixed with the regulating particles 1012 to be surface-modified, the sulfonic acid surfactant groups form a sulfonic acid shell layer on the surface of the whisker, such as a benzene ring sulfonic acid shell layer, which is beneficial to protecting the regulating particles 1012, enhancing the toughness of the regulating particles 1012, and reducing the breakage of the first type regulating particles 1012a and / or the second type regulating particles 1012b in the optical film 101; when the thio surfactant groups are mixed with the regulating particles 1012 to be surface-modified, the thio surfactant groups form a cross-linked network of OSO with the hydroxyl groups on the surface of the whiskers, OS The bond energy of O is relatively large, which is beneficial to 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 and forming the optical film 101, reducing the breakage of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b, and improving the improvement effect of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b on optical functions such as contrast and brightness.More preferably, the first type of regulating particles 1012a and / or the second type of regulating particles 1012b are treated with at least one of a sulfonic acid surfactant containing a fluorine-containing substituent and a thio surfactant containing a fluorine-containing substituent, specifically, at least one of sodium fluorododecylsulfonate, fluorooctanethiol, and fluorododecylthiol, wherein the fluorine atom has high stability in the alkyl chain, the bond energy of the carbon-fluorine bond is higher than the bond energy of the carbon-carbon bond, and the carbon-fluorine bond has a shielding effect on the carbon-carbon bond, which is beneficial to protecting the carbon-carbon bond, thereby improving the stability of the first type of regulating particles 1012a and / or the second type of regulating particles 1012b.

[0160] In some embodiments, the optical film 101 has an in-plane retardation value. By adding the adjusting particles 1012, the difference between the in-plane retardation value and the thickness direction retardation value of the optical film 101 is reduced. 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.

[0161] In some embodiments, the in-plane retardation of the optical film 101 is the retardation of the optical film 101 within the plane in which the optical film 101 is located, and the plane in which the optical film 101 is located is perpendicular to the thickness direction Y of the optical film 101. The optical film 101 has a thickness direction retardation in the thickness direction Y of the optical film 101. When light passes through the optical film 101, the difference between the refractive index of the light in the plane in which the optical film 101 is located and the refractive index of the light in the thickness direction Y of the optical film 101 causes a difference between the in-plane retardation and the thickness direction retardation of the optical film 101. When the in-plane retardation of the optical film 101 is greater than or equal to 3000 nanometers, the difference between the in-plane retardation and the thickness direction retardation of the optical film 101 is too large. When light passes through the optical film 101 and is observed at a large angle (for example, an angle of 45 degrees, 60 degrees, etc. with the thickness direction Y of the optical film 101), a rainbow pattern phenomenon is observed. By adding the regulating particles 1012, the difference between the refractive index of light in the plane of the optical film 101 and the light in the thickness direction Y of the optical film 101 is reduced, so that the in-plane delay value of the optical film 101 is less than 3000 nanometers, thereby improving the rainbow pattern problem of the optical film 101 in the large angle direction and improving the display quality of the display device having the optical film 101.

[0162] In some embodiments, the in-plane retardation value of the optical film 101 can be calculated using the following formula:

[0163] Re=d×|n x -n y ∣

[0164] Wherein, Re represents the in-plane retardation value of the optical film 101, n x represents the extraordinary refractive index, n y represents the ordinary light refractive index, and d represents the thickness of the optical film 101 .

[0165] In some embodiments, the in-plane retardation value of the optical film 101 can be obtained by using a phase retardation measuring instrument (such as Optipro-micro from Shintech) under a continuous spectrum white light source to obtain the difference between the extraordinary light refractive index and the ordinary light refractive index of the optical film 101, thereby obtaining the in-plane retardation value of the optical film 101 using the above formula.

[0166] In some embodiments, the retardation in the thickness direction of the optical film 101 can be the anisotropy values ​​ΔN of two sets of refractive indices observed on a cross section of the optical film 101 perpendicular to the plane where the optical film 101 is located. xz =△|n x -n z ∣、△N yz =△|n y -n z |The average value of the product of the thickness of the optical film 101, n z is the refractive index of the optical film 101 in the thickness direction.

[0167] In some embodiments, the in-plane retardation value of the optical film 101 is greater than or equal to 0 nm, and the in-plane retardation value of the optical film 101 is less than or equal to 1000 nm, which is beneficial to further reduce the difference between the in-plane retardation value of the optical film 101 and the thickness direction retardation value of the optical film 101. For example, it can be 20 nm, 50 nm, 100 nm, 120 nm, 150 nm, 200 nm, 220 nm, 250 nm, 300 nm, 320 nm, 350 nm, 400 nm, 420 nm, 450 nm, 500 nm, 520 nm, 550 nm, 600 nm, 620 nm, 650 nm, 700 nm, 720 nm, 750 nm, 800 nm, 820 nm, 850 nm, 900 nm, 920 nm, 950 nm, etc., thereby effectively improving the rainbow pattern problem of the optical film 101 in the large angle direction and improving the display quality of the display device having the optical film 101. Preferably, the in-plane retardation value of the optical film 101 is greater than or equal to 0 nanometers, and the in-plane retardation value of the optical film 101 is less than or equal to 500 nanometers, which further effectively improves the rainbow stripe problem of the optical film 101 in the large-angle direction and improves the display quality of the display device having the optical film 101; more preferably, the in-plane retardation value of the optical film 101 is greater than or equal to 0 nanometers, and the in-plane retardation value of the optical film 101 is less than or equal to 200 nanometers, so that the range of the in-plane retardation value of the optical film 101 is closest to the range of the thickness direction retardation value of the optical film 101, thereby most effectively improving the rainbow stripe problem of the optical film 101 in the large-angle direction and improving the display quality of the display device having the optical film 101.

[0168] 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 the light in the plane of the optical film 101 and the refractive index of the light in the thickness direction Y of the optical film 101 is, and the more conducive to eliminating the rainbow stripe problem. 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, it can be 0.2, 0.5, 0.6, 0.8, 1, 1.2, 1.4, 1.5, 1.6, 1.8, etc., which can effectively improve the rainbow stripe problem. Preferably, 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 or equal to 0.5, 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 or equal to 1.5, the rainbow stripe problem can be basically avoided. More preferably, 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 or equal to 0.6, 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 or equal to 1.2, the rainbow stripe problem can be completely eliminated.

[0169] 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.

[0170] 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, and modified or unmodified polyethylene terephthalate. The modified or unmodified cellulose acetate may include modified or unmodified cellulose triacetate.

[0171] In some embodiments, the substrate 1011 may include a first sub-substrate and / or a second sub-substrate. 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. In the substrate 1011, the mass fraction of the first sub-substrate is greater than the mass fraction of the second sub-substrate.

[0172] 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 greater than or equal to 65%, for example, it can be 70%, 75%, 80%, 85%, 90%, 95%, 99%, etc. The mass fraction of the second sub-substrate in the substrate 1011 is less than or equal to 35%, for example, it can be 1%, 5%, 10%, 15%, 20%, 25%, 30%, etc. It is beneficial to have good mutual solubility between modified polyesters such as polyethylene terephthalate and unmodified polyesters such as polyethylene terephthalate, or good mutual solubility between modified cellulose acetate and unmodified cellulose acetate such as triacetate, which helps to improve the mechanical properties, flatness, and crystallinity of the substrate 1011 and improve the dispersibility of the regulating particles 1012, thereby improving the optical properties of the optical film 101.

[0173] In some embodiments, the modified triacetyl cellulose, modified polyethylene terephthalate, modified polycarbonate, modified polymethyl methacrylate or modified polyethylene naphthalate can be obtained by respectively subjecting unmodified triacetyl cellulose, unmodified polyethylene terephthalate, unmodified polycarbonate, unmodified polymethyl methacrylate or unmodified polyethylene naphthalate to hydrophilic modification or lipophilic modification. For example, the 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 group into the unmodified polyethylene terephthalate; when the modified polyethylene terephthalate is obtained by introducing a carboxyl side chain and / or a hydroxyl side chain into the unmodified polyethylene terephthalate, the modified polyethylene terephthalate can be obtained by introducing a phenyl group into the unmodified polyethylene terephthalate. 、 A group, wherein n and m are both integers greater than or equal to 0 and less than or equal to 10.

[0174] In some embodiments, when the first sub-substrate is selected from unmodified polyethylene terephthalate, the second sub-substrate is selected from modified polyethylene terephthalate, which is beneficial to the good mutual solubility of the modified polyethylene terephthalate and the unmodified polyethylene terephthalate, helps to improve the mechanical properties, flatness, and crystallinity of the substrate 1011 and improve the dispersibility of the regulating particles 1012, thereby improving the optical properties of the optical film 101.

[0175] In some embodiments, the difference in refractive index between the substrate 1011 and the regulating particles 1012 is greater than or equal to 0.02, for example, it can be 0.03, 0.05, 0.09, 0.1, 0.15, 0.2, etc., so that the regulating particles 1012 can improve the rainbow problem of the optical film 101 while achieving a light diffusion function, further improving the optical performance of the optical film 101. Preferably, the difference in refractive index between the substrate 1011 and the regulating particles 1012 is greater than or equal to 0.1, for example, it can be 0.12, 0.13, 0.14, 0.15, 0.2, etc.

[0176] In some embodiments, the substrate 1011 has a glass transition temperature of 70°C to 600°C, 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.

[0177] In some embodiments, the substrate 1011 has an elastic modulus of 500 MPa to 5000 MPa at 23° C., 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.

[0178] In some embodiments, the elastic modulus of the substrate 1011 can be obtained at a humidity of 50%.

[0179] In some embodiments, the thickness of the optical film 101 is greater than or equal to 5 microns, and the thickness of the optical film 101 is less than or equal to 100 microns, for example, it can be 10 microns, 50 microns, 60 microns, 80 microns, 90 microns, etc., so as to facilitate the processing of the optical film 101 and maintain the appropriate light transmittance of the optical film 101. Preferably, the thickness of the optical film 101 is greater than or equal to 15 microns, and the thickness of the optical film 101 is less than or equal to 100 microns, for example, it can be 20 microns, 25 microns, 30 microns, 40 microns, 50 microns, 60 microns, 80 microns, etc.

[0180] The optical film 101 provided in the embodiment of the present application adds regulating particles 1012 to the substrate 1011 of the optical film 101, so that at least one of the first type regulating particles 1012a and the second regulating particles 1012 is dispersed in the dispersion portion 1011a, so that the regulating particles 1012 obtain a better optical improvement effect, thereby improving the display quality of the display device having the optical film 101.

[0181] Furthermore, in the embodiment of the present application, the mechanical properties of the optical film 101 are tested, wherein the testing equipment is a single-column computer system tensile testing machine (model AI-3000, manufactured by Gaotie Testing Instrument Co., Ltd.).

[0182] Test steps: Take a sample with a width × thickness of 250mm × 200mm and place it on the test instrument with a clamp at a speed of 100-200mm / min.

[0183] The calculation formula for tensile strength includes:

[0184] .

[0185] Wherein, σ is the tensile strength, in MPa; p is the maximum load, in N; b is the specimen width, in mm; h is the specimen thickness, in mm.

[0186] The calculation formula for elongation at break is:

[0187] .

[0188] Wherein, e is the elongation at break, in %; L1 is the distance between the two marking lines of the unstretched specimen, in mm; L2 is the distance between the two marking lines when the specimen breaks, in mm.

[0189] It should be noted that the median of the five calculated values ​​in the longitudinal and transverse directions is taken as the test result, and the maximum and minimum values ​​in each direction are reported. The tensile strength results are rounded to three significant figures; the elongation at break results are rounded to two significant figures, and the results are shown in Table 1 below:

[0190] Table 1

[0191] Particle shape mass fraction tensile strength elongation at break comparative example / 0% 180 MPa 55% Example 01 spherical 0.5% 200 MPa 120% Example 02 spherical 1% 250 MPa 260% Example 03 rod-shaped 0.5% 205 MPa 136%

[0192] As can be seen from Table 1, the embodiment of the present application can effectively improve the mechanical properties of the optical film 101 by adding the regulating particles 1012 into the optical film 101.

[0193] It should be noted that 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 .

[0194] In some embodiments, the tensile strength of the optical film 101 is greater than or equal to 30 MPa and less than or equal to 300 MPa. Further preferably, the tensile strength of the optical film 101 is greater than 180 MPa, for example, it can be 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.

[0195] 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%. Further preferably, the elongation at break of the optical film 101 is greater than 55%, for example, it can be 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%.

[0196] In some embodiments, the optical film 101 has a breaking strength greater than or equal to 50 N / mm and less than or equal to 500 N / mm; for example, it can be 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 rate less than 2%, for example, it can be 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%.

[0197] 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 greater than or equal to 30 and less than or equal to 150 MPa, and the elongation at break of the optical film 101 may be greater than or equal to 5% and less than or equal 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 greater than or equal to 100 MPa and less than or equal to 300 MPa, and the elongation at break of the optical film 101 may be greater than or equal to 50% and less than or equal to 300%.

[0198] Referring to FIG. 7 to FIG. 10 , an embodiment of the present application further provides a polarizer 100 , including the optical film 101 as described above.

[0199] The polarizer 100 further includes a polarizing layer 102 located on one side of the optical film 101 .

[0200] 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 close to the optical film 101 , and the second surface of the optical film 101 is located on the side of the first surface of the optical film 101 away from the polarizing layer.

[0201] Preferably, the polarizer further comprises a first optical functional layer located on at least one side of the substrate, the first optical functional layer comprising at least one of an anti-glare sublayer, a transparent hardening sublayer, a low-reflection sublayer, an anti-reflection sublayer, an anti-fingerprint sublayer, and an anti-static electron layer, and the side of the dispersion portion away from the polarizing layer is coplanar with the second surface;

[0202] Wherein, the first optical functional layer is located between the polarizing layer and the optical film; or

[0203] The first optical functional layer is located on a side of the optical film away from the polarizing layer.

[0204] Specifically, the polarizer 100 further includes a first adhesive layer 104 located on the optical film 101 close to the polarizing layer 102 , and the first surface of the optical film is adhered to a side of the polarizing layer 102 close to the optical film 101 through the first adhesive layer 104 .

[0205] Referring to Figures 7 to 10 , in some embodiments, the side of the dispersion portion 1011a away from the polarizing layer is coplanar with the second surface. When the polarizer 100 is used in a display device, the polarizer 100 can be located on the light-emitting side of the display panel of the display device. In this case, the optical film 101 is located on the light-emitting side of the polarizing layer 102. By coplanarizing the side of the dispersion portion 1011a away from the polarizing layer with the second surface, the dispersion portion 1011a is closer to the user side of the display device, which facilitates the optical improvement effect achieved by the first type of regulating particles 1012a and / or the second type of regulating particles 1012b dispersed within the dispersion portion 1011a to the user, thereby improving the display quality of the display device equipped with the polarizer 100.

[0206] Referring to FIG. 7 to FIG. 10 , in some embodiments, the polarizer 100 further includes a first optical functional layer 103 located on at least one side of the substrate 1011 .

[0207] 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 a side of the optical film 101 away from the polarizing layer 102 (as shown in FIG. 7 to FIG. 9 ).

[0208] Referring to Figures 7 to 8 and Figure 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 Figure 9, the polarizer 100 further includes a protective layer 105 located 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.

[0209] In some embodiments, the first adhesive layer 104 is in direct contact with the optical film 101 and the polarizing layer 102 ; or, the first adhesive layer 104 is in direct contact with the optical film 101 and the protective layer 105 .

[0210] In some embodiments, the first adhesive layer 104 can be selected from at least one of water-based adhesive, pressure-sensitive adhesive, and UV adhesive. The material of the water-based adhesive can be selected from polyvinyl alcohol, the material of the pressure-sensitive adhesive can be selected from acrylate copolymers, and the material of the UV adhesive can be selected from multifunctional acrylate monomers.

[0211] Referring to Figures 7 to 9 , in some embodiments, the first optically functional layer 103 includes a transparent hardened sublayer 107 (as shown in Figures 7 and 8 ), a low-reflection sublayer 108 (as shown in Figure 9 ), an anti-reflection sublayer, an anti-fingerprint sublayer, and an anti-static electron layer. Referring to Figure 9 , when the first optically functional layer 103 is the low-reflection sublayer 108, the low-reflection sublayer 108 may be formed by stacking a transparent hardened sublayer 108b and a low-refractive sublayer 108a.

[0212] Referring to FIG. 10 , in some embodiments, the protective layer 105 is located on a side of the optical film 101 away from the polarizing layer 102 .

[0213] In some embodiments, the polarizing layer 102 is composed of polyvinyl alcohol and dye.

[0214] Referring to Figures 7 to 10 , in some embodiments, the polarizer 100 further includes a release layer 109 located on a side of the polarizing layer 102 away from the optical film 101. The release layer 109 is bonded to the polarizing layer 102 via a second adhesive layer 110. When the polarizer 100 is applied to the display device, the release layer 109 is removed to expose the second adhesive layer 110, allowing the polarizer 100 to be bonded to the display panel via the second adhesive layer 110.

[0215] Referring to FIG. 7 to FIG. 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 .

[0216] In the embodiment of the present application, the optical film 101 is provided to avoid optical defects such as moiré or white spots caused by the polarizer 100 , while improving the chromaticity, viewing angle and contrast of the display device using the polarizer 100 .

[0217] Referring to FIG. 11 , an embodiment of the present application further provides a display device 10 , including the polarizer 100 as described above.

[0218] Specifically, the display device includes a display panel 200 and a first polarizer 300 . The first polarizer 300 is located on the light-emitting side of the display panel 200 . The first polarizer 300 is selected from the polarizer 100 described above.

[0219] In some embodiments, the display panel 200 may be a liquid crystal display panel, a self-luminous display panel, etc. The self-luminous display panel may be an OLED (Organic Light-Emitting Diode) display panel, etc.

[0220] In some embodiments, the optical film 101 in the first polarizer 300 is located on a side of the polarizing layer 102 in the first polarizer 300 away from the display panel.

[0221] When the display panel 200 is a liquid crystal display panel, the display device 10 further includes a backlight module 400 located on a side of the display panel 200 away from the first polarizer 300. The backlight module 400 is used to provide light for the display panel 200. 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 can be selected from the polarizer 100 described above, or the second polarizer 500 can be selected from a different polarizer 100.

[0222] Next, the present application will be described in more detail with reference to some embodiments. However, it should be noted that these examples are provided for illustration only and should not be understood in any way as limiting the present application.

[0223] Example 1

[0224] In this embodiment, the material of the substrate is unmodified polyethylene terephthalate, the regulating particles in the substrate are spherical polystyrene, and the regulating particles are dispersed in an upper substrate sublayer with a thickness of 20 microns in the substrate. The upper substrate sublayer with a thickness of 20 microns, the middle substrate sublayer with a thickness of 20 microns, and the lower substrate sublayer with a thickness of 20 microns are stretched in the MD direction (Moving Direction) and the TD direction (Transfer Direction) (stretching ratio MD×TD is 5×3) to form an optical film 1 with a thickness of 60 microns. The mass fraction of the regulating particles in the optical film 1 is 0.5%.

[0225] Example 2

[0226] This embodiment is the same as or similar to the embodiment 1, except that the adjustment particles are rod-shaped calcium carbonate to form the optical film 2 .

[0227] Example 3

[0228] This embodiment is the same as or similar to the embodiment 1, except that the particles are adjusted to be cubic calcium carbonate to form the optical film 3 .

[0229] Example 4

[0230] This embodiment is similar to the embodiment 1, except that the regulating particles are formed by mixing rod-shaped calcium carbonate, spherical polystyrene, and cubic silicon dioxide in a mass ratio of 2:6:2 to form the optical film 4 .

[0231] Example 5

[0232] This embodiment is similar to embodiment 2, except that the particles are dispersed in an upper substrate sublayer having a thickness of 18 μm to form an optical film 5 .

[0233] Example 6

[0234] This embodiment is similar to the embodiment 3, except that the particles are dispersed in a middle substrate sublayer with a thickness of 20 μm in the substrate to form the optical film 6 .

[0235] Example 7

[0236] This embodiment is similar to embodiment 6, except that the particles are dispersed in a lower substrate sublayer with a thickness of 20 μm in the substrate to form an optical film 7 .

[0237] Example 8

[0238] This embodiment is similar to embodiment 4, except that the particles are dispersed in an upper substrate sublayer with a thickness of 2 μm in the substrate to form an optical film 8 .

[0239] Example 9

[0240] This embodiment is similar to embodiment 4, except that the particles are dispersed in an upper substrate sublayer having a thickness of 6 μm to form an optical film 9 .

[0241] Example 10

[0242] This embodiment is similar to embodiment 4, except that the particles are dispersed in an upper substrate sublayer having a thickness of 12 μm to form the optical film 10 .

[0243] Example 11

[0244] This embodiment is similar to embodiment 4, except that the particles are dispersed in an upper substrate sublayer with a thickness of 15 μm in the substrate to form the optical film 11 .

[0245] Example 12

[0246] This embodiment is similar to the embodiment 4, except that the particles are dispersed in an upper substrate sublayer with a thickness of 30 μm in the substrate to form the optical film 12 .

[0247] Example 13

[0248] This embodiment is similar to the embodiment 4, except that the particles are dispersed in an upper substrate sublayer with a thickness of 40 μm in the substrate to form the optical film 13 .

[0249] Example 14

[0250] This embodiment is similar to the embodiment 4, except that the particles are dispersed in an upper substrate sublayer having a thickness of 48 μm to form the optical film 14 .

[0251] Example 15

[0252] This embodiment is similar to embodiment 4, except that the particles are dispersed in an upper substrate sublayer having a thickness of 54 μm to form an optical film 15 .

[0253] Example 16

[0254] This embodiment is similar to embodiment 4, except that the particles are dispersed in an upper substrate sublayer having a thickness of 58 μm in the substrate to form the optical film 16 .

[0255] Comparative Example 1

[0256] This comparative example is similar to Example 2, except that the particles are distributed in the upper substrate sublayer, the middle substrate sublayer, and the lower substrate sublayer to form a comparative optical film 1.

[0257] 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 phase retardation measuring instrument from Shintech to obtain in-plane retardation values. The results are shown in Table 1.

[0258] 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. The polarizers were then attached to the surface of a 75-inch liquid crystal display panel and observed for rainbow patterns when viewed from the front and side. The results are shown in Table 1. The polarizer to be tested included a compensation layer, a polarizing layer, a protective layer, an optical film (or comparative optical film), and a transparent hardened sublayer, stacked in this order.

[0259] The optical films obtained in Examples 1 to 16 were placed on the side of the polarizer away from the display panel. The upper substrate sublayer was located on the side of the middle substrate sublayer away from the display panel, and the lower substrate sublayer was located on the side of the middle substrate sublayer away from the display panel. The polarizers were then attached to the surface of a 75-inch liquid crystal display panel for further optical performance testing. The results are shown in Table 2. The polarizers to be tested included a compensation layer, a polarizing layer, a protective layer, an optical film (or a comparison optical film), and a transparent hardened sublayer, stacked in this order.

[0260] Contrast ratio is the ratio of the brightness of the display panel in the white state to the brightness in the dark state. In this test, the center brightness of the display panel in the white state and the center brightness of the display panel in the dark state are measured.

[0261] The chromaticity viewing angle measurement is performed based on the CESI standard (CESI 0.03).

[0262] Table 2

[0263] In-plane retardation value (nm) Rainbow pattern Contrast ratio Chromaticity Viewing angle ° Optical film 14 No rainbow pattern 3986144 Optical film 218 No rainbow pattern 3100160 Optical film 310 No rainbow pattern 3658150 Optical film 413 No rainbow pattern 3534155 Optical film 520 No rainbow pattern 3015163 Optical film 611 No rainbow pattern 3587151 Optical film 711 No rainbow pattern 3523152 Optical film 832 No rainbow pattern 4326138 Optical film 928 without rainbow pattern 3001164 Optical film 1016 without rainbow pattern 3122160 Optical film 1122 without rainbow pattern 3221156 Optical film 1219 without rainbow pattern 3523149 Optical film 1317 without rainbow pattern 3745145 Optical film 1412 without rainbow pattern 3978141 Optical film 159 without rainbow pattern 4141139 Optical film 168 without rainbow pattern 4326138 Comparison Optical film 115 without rainbow pattern 3366158

[0264] As shown in Table 2, by dispersing the regulating particles in the substrate sublayer of the substrate, the in-plane retardation value of the optical film is effectively reduced, the rainbow stripe problem is eliminated, and the contrast and Seesi viewing angle are improved. Dispersing the regulating particles in the dispersion portion (upper substrate sublayer) on the side farther away from the display panel has a better optical improvement effect on the optical film in terms of contrast and Seesi viewing angle. Compared with dispersing the regulating particles throughout the optical film, dispersing the regulating particles in the dispersion portion (for example, the upper substrate sublayer) has a better optical improvement effect on the optical film in terms of contrast and Seesi viewing angle. In terms of reducing the in-plane retardation value of the optical film, spherical particles are the most effective in reducing the in-plane retardation value of the optical film, followed by cubic particles. Regulating particles composed of a mixture of particles of various shapes are the third most effective in reducing the in-plane retardation value of the optical film, and rod-shaped particles are the least effective in reducing the in-plane retardation value of the optical film. In terms of improving the chromaticity, viewing angle and contrast of optical films, rod-shaped particles have the best improvement effect, followed by regulating particles composed of a mixture of particles of various shapes, cube-shaped particles have the third best improvement effect, and spherical particles have the worst improvement effect.

[0265] The embodiments of the present application disclose an optical film, a polarizer and a display device. The optical film includes a substrate and regulating particles. The regulating particles include first-type regulating particles and / or second-type regulating particles. The aspect ratio of the first-type regulating particles is greater than or equal to 5 and less than or equal to 50, and the aspect ratio of the second-type regulating particles is greater than or equal to 1 and less than 5. The first-type regulating particles and / or the second-type regulating particles are dispersed in a dispersed portion of the substrate. The ratio of the thickness of the dispersed portion to the thickness of the substrate is greater than or equal to 1:100 and less than 1:1. The present application adds regulating particles to the substrate of the optical film so that at least one of the first-type regulating particles and the second regulating particles is dispersed in the dispersed portion, so that the regulating particles obtain better optical improvement effect and enhance the display quality of the display device having the optical film.

[0266] The above is a detailed introduction to an optical film, a polarizer, and a display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An optical film comprising: A substrate, comprising a dispersion portion, wherein a ratio of a thickness of the dispersion portion to a thickness of the substrate is greater than or equal to 1:100 and less than 1:1; as well as Adjusting particles, dispersed in the dispersion portion, the adjusting particles comprising: The first type of regulating particles has a plurality of first cross sections, each of the first cross sections has a first circumscribed circle, the ratio of the major axis length of the first type of regulating particles to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is greater than or equal to 5, and the ratio of the major axis length of the first type of regulating particles to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is less than or equal to 50; and / or The second type of regulating particles has multiple second cross-sections, each of the second cross-sections has a second circumscribed circle, the ratio of the major axis length of the second type of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is greater than or equal to 1, and the ratio of the major axis length of the second type of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is less than 5.

2. The optical film according to claim 1, wherein The ratio of the thickness of the dispersing portion to the thickness of the substrate is greater than or equal to 1:10, and the ratio of the thickness of the dispersing portion to the thickness of the substrate is less than or equal to 9:

10.

3. The optical film according to claim 1, wherein Along the thickness direction of the substrate, the substrate includes a first surface and a second surface that are arranged opposite to each other, a side of the dispersion portion close to the first surface is parallel to the first surface, and a side of the dispersion portion close to the second surface is parallel to or overlaps with the second surface; Wherein, the ratio of the thickness of the dispersion portion to the thickness of the substrate is greater than or equal to 1:4, and the ratio of the thickness of the dispersion portion to the thickness of the substrate is less than or equal to 1:

2.

4. The optical film according to any one of claims 1 to 3, wherein The regulating particles include the first type of regulating particles, the first type of regulating particles are dispersed in the dispersion portion, the long axis of the first type of regulating particles forms an acute angle with the plane where the first surface of the substrate is located, and the acute angle is greater than or equal to 0° and less than or equal to 40°.

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

6. The optical film according to claim 1, wherein: The first type of regulating particles is selected from at least one of the first sub-type regulating particles, the second sub-type regulating particles, the third sub-type regulating particles, the fourth sub-type regulating particles, and the fifth sub-type regulating particles, which have different shapes from each other; the second type of regulating particles is selected from at least one of the sixth sub-type regulating particles, the seventh sub-type regulating particles, the eighth sub-type regulating particles, the ninth sub-type regulating particles, and the tenth sub-type regulating particles, which have different shapes from each other; Wherein, along the extension direction of the long axis of the first sub-category regulating particle, the change value of the diameter of the first circumscribed circle of the first cross section of the first sub-category regulating particle is less than or equal to 0.3 micrometers; Along the extension direction of the long axis of the second subclass regulating particle, the change value of the diameter of the first circumscribed circle of the first cross section located at the middle part of the second subclass regulating particle is less than or equal to 1 micron, and along the direction away from the middle part of the second subclass regulating particle, the diameter of the first circumscribed circle of the first cross section located at the first end of the second subclass regulating particle gradually decreases, and the change value of the diameter of the first circumscribed circle of the first cross section located at the second end of the second subclass regulating particle is less than or equal to 1 micron; Along the extension direction of the long axis of the third subclass regulating particle, the change value of the diameter of the first circumscribed circle of the first cross section located in the middle of the third subclass regulating particle is less than or equal to 1 micron, and along the direction away from the middle of the third subclass regulating particle, the diameter of the first circumscribed circle of the first cross section located at the first end of the third subclass regulating particle gradually decreases, and the diameter of the first circumscribed circle of the first cross section located at the second end of the third subclass regulating particle gradually decreases; The first end of the fourth subclass regulating particle is connected to the second end of the fourth subclass regulating particle, and the diameter of the first circumscribed circle located at the first cross section of the fourth subclass regulating particle gradually decreases along the direction from the first end of the fourth subclass regulating particle to the second end of the fourth subclass regulating particle; The first end of the fifth subclass regulating particle is connected to the second end of the fifth subclass regulating particle, and the diameter of the first circumscribed circle of the first cross section located at the first end of the fifth subclass regulating particle gradually decreases along the direction away from the second end of the fifth subclass regulating particle, and the diameter of the first circumscribed circle of the first cross section located at the second end of the fifth subclass regulating particle gradually decreases along the direction away from the first end of the fifth subclass regulating particle; Along the extension direction of the long axis of the sixth subclass regulating particle, the change value of the diameter of the second circumscribed circle of the second cross section of the sixth subclass regulating particle is less than or equal to 0.3 micrometers; The first end of the seventh subclass regulating particle is connected to the second end of the seventh subclass regulating particle, and the diameter of the second circumscribed circle of the second cross section located at the first end of the seventh subclass regulating particle gradually decreases in a direction away from the second end of the seventh subclass regulating particle, and the diameter of the second circumscribed circle of the second cross section located at the second end of the seventh subclass regulating particle gradually decreases in a direction away from the first end of the seventh subclass regulating particle; Along the extension direction of the long axis of the eighth subclass regulating particle, the change value of the diameter of the second circumscribed circle of the second cross section located in the middle part of the eighth subclass regulating particle is less than or equal to 1 micron, along the direction away from the middle part of the eighth subclass regulating particle, the diameter of the second circumscribed circle of the second cross section located at the first end of the eighth subclass regulating particle gradually decreases, and the change value of the diameter of the second circumscribed circle of the second cross section located at the second end of the eighth subclass regulating particle is less than or equal to 1 micron; Along the extension direction of the long axis of the ninth subclass regulating particle, the change value of the diameter of the second circumscribed circle of the second cross section located in the middle part of the ninth subclass regulating particle is less than or equal to 1 micron, and along the direction away from the middle part of the ninth subclass regulating particle, the diameter of the second circumscribed circle of the second cross section located at the first end of the ninth subclass regulating particle gradually decreases, and the diameter of the second circumscribed circle of the second cross section located at the second end of the ninth subclass regulating particle gradually decreases; The first end of the tenth subclass regulating particle is connected to the second end of the tenth subclass regulating particle, and the diameter of the second circumscribed circle of the second cross-section of the tenth subclass regulating particle gradually decreases along the direction from the first end of the tenth subclass regulating particle to the second end of the tenth subclass regulating particle.

7. The optical film according to claim 6, wherein: The regulating particles include the first type of regulating particles and the second type of regulating particles, 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%.

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

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

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

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

12. The optical film according to claim 9, wherein: The tensile strength of the first sublayer is greater than that of the second sublayer, and the tensile strength of the third sublayer is greater than that of the second sublayer.

13. The optical film according to claim 9, wherein: 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.

14. The optical film according to claim 1, wherein: The elongation at break of the optical film is greater than or equal to 1% and less than or equal to 300%.

15. The optical film according to claim 1, wherein The breaking strength of the optical film is greater than or equal to 50 N / mm and less than or equal to 500 N / mm, and the heat shrinkage rate of the optical film is less than 2%.

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 the second surface of the optical film is located on a side of the first surface of the optical film away from the polarizing layer; The optical film comprises: A substrate, comprising a dispersion portion, wherein a ratio of a thickness of the dispersion portion to a thickness of the substrate is greater than or equal to 1:100 and less than 1:1; and Adjusting particles, dispersed in the dispersion portion, the adjusting particles comprising: The first type of regulating particles has a plurality of first cross sections, each of the first cross sections has a first circumscribed circle, the ratio of the major axis length of the first type of regulating particles to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is greater than or equal to 5, and the ratio of the major axis length of the first type of regulating particles to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is less than or equal to 50; and / or The second type of regulating particles has multiple second cross-sections, each of the second cross-sections has a second circumscribed circle, the ratio of the major axis length of the second type of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is greater than or equal to 1, and the ratio of the major axis length of the second type of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is less than 5.

17. The polarizer according to claim 16, wherein: The substrate includes a first sublayer, a second sublayer and a third sublayer which are stacked, the first sublayer and the third sublayer are located on opposite sides of the second sublayer, and the dispersion portion is located in at least one of the first sublayer, the second sublayer and the third sublayer.

18. The polarizer according to claim 17, wherein: The dispersion portion is located in the first sub-layer and / or in the third sub-layer.

19. The polarizer according to claim 16, wherein: The polarizer further includes a first optical functional layer located on at least one side of the substrate, the first optical functional layer includes at least one of an anti-glare sublayer, a transparent hardening sublayer, a low-reflection sublayer, an anti-reflection sublayer, an anti-fingerprint sublayer, and an anti-static electron layer, and the side of the dispersion portion away from the polarizing layer is coplanar with the second surface; Wherein, the first optical function layer is located between the polarizing layer and the optical film; or, The first optical function layer is located on a side of the optical film away from the polarizing layer.

20. A display device, comprising a polarizer, wherein the polarizer comprises a polarizing layer and an optical film, wherein the polarizing layer is disposed on one side of the optical film, and the second surface of the optical film is located on a side of the first surface of the optical film away from the polarizing layer; The optical film comprises: A substrate, comprising a dispersion portion, wherein a ratio of a thickness of the dispersion portion to a thickness of the substrate is greater than or equal to 1:100 and less than 1:1; and Adjusting particles, dispersed in the dispersion portion, the adjusting particles comprising: The first type of regulating particles has a plurality of first cross sections, each of the first cross sections has a first circumscribed circle, the ratio of the major axis length of the first type of regulating particles to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is greater than or equal to 5, and the ratio of the major axis length of the first type of regulating particles to the diameter of the first circumscribed circle with the largest diameter among the plurality of first circumscribed circles is less than or equal to 50; and / or The second type of regulating particles has multiple second cross-sections, each of the second cross-sections has a second circumscribed circle, the ratio of the major axis length of the second type of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is greater than or equal to 1, and the ratio of the major axis length of the second type of regulating particles to the diameter of the second circumscribed circle with the largest diameter among the multiple second circumscribed circles is less than 5.

Images