Optical film, polarizer, and display device

Abstract

To solve the following problems in which stable product quality or optical effect of an optical film cannot be easily maintained and product quality of a display device cannot be easily stabilized due to a wide size distribution of adjusting particles added to the optical film.SOLUTION: An optical film 101 comprises a base material 1011 and adjusting particles 1012 dispersed in the base material. The adjusting particles 1012 comprise a first type of adjusting particles 1012a and / or a second type of adjusting particles. The aspect ratio of the first type of adjusting particles 1012a is greater than or equal to 1 and less than 5, and the aspect ratio of the second type of adjusting particles is greater than or equal to 5 and smaller than or equal to 50. The particle size value of the first type of adjusting particles 1012a larger than or equal to 80% is within the range of 50%-140% of the first center particle size value, and the particle size value of the second type of adjusting particles larger than or equal to 80% is within the range of 50%-140% of the second center particle size value. The particle size distribution range of the adjusting particles 1012 is controlled so that the particle size values of most of the adjusting particles 1012 are close to the center particle size value.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Currently, polarizers generally have a polarizing layer, and an optical film is used as a protective layer for the polarizing layer to protect the polarizing layer, and at the same time, control particles are added to the optical film to improve the optical performance of the optical film (increasing the viewing angle, etc.). However, since the control particles added to the optical film have a wide particle size distribution, it is difficult to maintain stable product quality and optical effects of the optical film, and there is a problem that it is difficult to stabilize the product quality of a display device equipped with the optical film.

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

[0004] The present invention provides an optical film, a polarizer and a display device that can alleviate the current technical problem that it is difficult to stabilize the product quality of a display device due to the optical film.

[0005] The present invention relates to A substrate; and modulating particles, the modulating particles being dispersed in the substrate; wherein the regulatory particles include a first type of regulatory particle and / or a second type of regulatory particle; The first type of regulating particle has a plurality of first cross sections, each of the first cross sections having one first circumscribing circle, the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle having the largest diameter among the plurality of first circumscribing circles is 1 or more, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle having the largest diameter among the plurality of first circumscribing circles is less than 5; The second type of regulating particle has a plurality of second cross sections, each of the second cross sections having one second circumscribing circle, the ratio of the length of the major axis of the second type of regulating particle to the diameter of the second circumscribing circle having the largest diameter among the plurality of second circumscribing circles is 5 or more, and the ratio of the length of the major axis of the second type of regulating particle to the diameter of the second circumscribing circle having the largest diameter among the plurality of second circumscribing circles is 50 or less; Each of the first type regulating particles has a first particle size value, the first particle size values ​​of all the first type regulating particles are distributed in a certain range, all the first type regulating particles correspond to one first median particle size value, and among all the first type regulating particles, the first particle size values ​​of 80% or more of the first type regulating particles are located within 50% to 140% of the range of the first median particle size value; Each of the second type regulating particles has a second particle size value, the second particle size values ​​of all the second type regulating particles are distributed in a certain range, all the second type regulating particles correspond to one second median particle size value, and among all the second type regulating particles, the second particle size values ​​of 80% or more of the second type regulating particles are located within 50% to 140% of the range of the second median particle size value. An optical film is provided.

[0006] Preferably, the first particle size value of 80% or more of the first type of regulating particles among all the first type of regulating particles is located within 70% to 110% of the range of the first median particle size value, and / or Of all the second type regulating particles, 80% or more of the second type regulating particles have a second particle size value within a range of 70% to 110% of the second median particle size value.

[0007] Preferably, the optical film has an in-plane retardation value, and the in-plane retardation value of the optical film is less than 3000 nanometers. Preferably, the optical film has a thickness retardation value, and a ratio of an in-plane retardation value of the optical film to a thickness retardation value of the optical film is greater than 0.1, and a ratio of an in-plane retardation value of the optical film to a thickness retardation value of the optical film is less than 2.

[0008] Preferably, the first type of regulatory particles are selected from at least one of a first subtype of regulatory particles, a second subtype of regulatory particles, a third subtype of regulatory particles, a fourth subtype of regulatory particles, and a fifth subtype of regulatory particles having different shapes, and the second type of regulatory particles are selected from at least one of a sixth subtype of regulatory particles, a seventh subtype of regulatory particles, an eighth subtype of regulatory particles, a ninth subtype of regulatory particles, and a tenth subtype of regulatory particles having different shapes; wherein the change in diameter of the first circumscribing circle of the first cross section of the first subtype regulatory particle along the extension direction of the long axis of the first subtype regulatory particle is 0.3 microns or less; a first end of the second subtype regulatory particle is connected to a second end of the second subtype regulatory particle, and along a direction away from the second end of the second subtype regulatory particle, a diameter of a first circumscribing circle of the first cross-section located at the first end of the second subtype regulatory particle gradually decreases; along a direction away from the first end of the second subtype regulatory particle, a diameter of a first circumscribing circle of the first cross-section located at the second end of the second subtype regulatory particle gradually decreases; Along the extension direction of the long axis of the third subtype regulatory particle, the change in diameter of the first circumscribing circle of the first cross-section located at the center of the third subtype regulatory particle is 1 micron or less, and along the direction away from the center of the third subtype regulatory particle, the diameter of the first circumscribing circle of the first cross-section located at the first end of the third subtype regulatory particle gradually decreases, and the change in diameter of the first circumscribing circle of the first cross-section located at the second end of the third subtype regulatory particle is 1 micron or less; Along the extension direction of the long axis of the fourth subtype regulatory particle, the change in diameter of the first circumscribing circle of the first cross-section located at the center of the fourth subtype regulatory particle is 1 micron or less, along the direction away from the center of the fourth subtype regulatory particle, the diameter of the first circumscribing circle of the first cross-section located at the first end of the fourth subtype regulatory particle gradually decreases, and the diameter of the first circumscribing circle of the first cross-section located at the second end of the fourth subtype regulatory particle gradually decreases, a first end of the fifth subtype regulatory particle is connected to a second end of the fifth subtype regulatory particle, and a diameter of a first circumscribing circle of the first cross section of the fifth subtype regulatory particle gradually decreases along a direction from the first end of the fifth subtype regulatory particle to the second end of the fifth subtype regulatory particle; The change in diameter of the second circumscribing circle of the second cross section of the sixth subtype regulatory particle along the extension direction of the long axis of the sixth subtype regulatory particle is 0.3 microns or less; Along the extension direction of the long axis of the seventh subtype regulatory particle, the change in diameter of the second circumscribing circle of the second cross section located at the center of the seventh subtype regulatory particle is 1 micron or less, and along the direction away from the center of the seventh subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the seventh subtype regulatory particle gradually decreases, and the change in diameter of the second circumscribing circle of the second cross section located at the second end of the seventh subtype regulatory particle is 1 micron or less; Along the extension direction of the long axis of the eighth subtype regulatory particle, the change in diameter of the second circumscribing circle of the second cross section located at the center of the eighth subtype regulatory particle is 1 micron or less, along the direction away from the center of the eighth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the eighth subtype regulatory particle gradually decreases, and the diameter of the second circumscribing circle of the second cross section located at the second end of the eighth subtype regulatory particle gradually decreases, a first end of the ninth subtype regulatory particle is connected to a second end of the ninth subtype regulatory particle, and a diameter of a second circumscribing circle of the second cross section of the ninth subtype regulatory particle gradually decreases along a direction from the first end of the ninth subtype regulatory particle to the second end of the ninth subtype regulatory particle; The first end of the tenth subtype regulatory particle is connected to the second end of the tenth subtype regulatory particle, and along the direction away from the second end of the tenth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the tenth subtype regulatory particle gradually decreases, and along the direction away from the first end of the tenth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the second end of the tenth subtype regulatory particle gradually decreases.

[0009] Preferably, the first subtype of regulating particles is selected from cubic particles or rectangular particles, the second subtype of regulating particles is selected from spherical particles or ellipsoidal particles, the third subtype of regulating particles is selected from needle-shaped particles with a reduced diameter at one end, the fourth subtype of regulating particles is selected from needle-shaped particles with a reduced diameter at both ends, the fifth subtype of regulating particles is selected from cone-shaped particles, the sixth subtype of regulating particles is selected from rod-shaped particles, the seventh subtype of regulating particles is selected from needle-shaped particles with a reduced diameter at one end, the eighth subtype of regulating particles is selected from needle-shaped particles with a reduced diameter at both ends, the ninth subtype of regulating particles is selected from cone-shaped particles, and the tenth subtype of regulating particles is selected from bicone-shaped particles or ellipsoidal particles.

[0010] Preferably, the first median particle size value is less than 20 microns and the second median particle size value is less than 20 microns. Preferably, the mass fraction of the regulating particles in the optical film is 20% or less.

[0011] The present invention further provides a polarizer comprising the above-described optical film. The present invention further provides a display device comprising the polarizer described above.

[0012] The present invention controls the particle size distribution range of the regulating particles so that the particle size values ​​of the majority of the regulating particles approach the median particle size value, thereby improving the product stability of the optical film and improving the stability of the product quality of the display device equipped with the optical film. [Brief description of the drawings]

[0013] In order to more clearly describe the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can obtain other drawings based on these drawings without creative efforts.

[0014] [Figure 1] FIG. 1 is a first structural schematic diagram of an optical film provided in an embodiment of the present invention. [Diagram 2] FIG. 2 is a second structural schematic diagram of the optical film provided in the embodiment of the present invention. [Diagram 3] FIG. 1 is a first structural schematic diagram of a polarizer provided in an embodiment of the present invention. [Figure 4] FIG. 2 is a second structural schematic diagram of a polarizer provided in an embodiment of the present invention. [Diagram 5] FIG. 3 is a third structural schematic diagram of a polarizer provided in an embodiment of the present invention. [Figure 6] FIG. 4 is a schematic diagram of the fourth structure of a polarizer provided in an embodiment of the present invention. [Figure 7] FIG. 2 is a structural schematic diagram of a display device provided in an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. All other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention are included in the scope of protection of the present invention. In addition, it should be understood that the specific embodiments described herein are only used to explain and interpret the present invention, and are not intended to limit the present invention. In the present invention, unless otherwise specified, terms indicating directions such as "upper", "lower", etc. usually refer to the upper and lower positions of the device in actual use or working state, specifically the direction of the drawing. Meanwhile, "inner" and "outer" refer to the contour of the device.

[0016] Currently, the regulating particles added to optical films for polarizing layers have a wide particle size distribution, making it difficult to improve the product stability of the optical films, and as a result, there is a technical problem that it is difficult to stabilize the product quality of display devices equipped with the optical films.

[0017] 1 to 2, an embodiment of the present invention provides an optical film 101, the optical film 101 comprising: A substrate 1011; and a regulatory particle 1012, the regulatory particle 1012 being dispersed in the substrate 1011; Wherein the regulatory particles 1012 include a first type regulatory particle 1012a and / or a second type regulatory particle 1012b; The first type regulating particle 1012a has a plurality of first cross sections, each of the first cross sections having one first circumscribing circle, the ratio of the length of the major axis of the first type regulating particle 1012a to the diameter of the first circumscribing circle having the largest diameter among the plurality of first circumscribing circles is 1 or more, and the ratio of the length of the major axis of the first type regulating particle 1012a to the diameter of the first circumscribing circle having the largest diameter among the plurality of first circumscribing circles is less than 5; The second type regulating particle 1012b has a plurality of second cross sections, each of the second cross sections having one second circumscribing circle, the ratio of the length of the major axis of the second type regulating particle 1012b to the diameter of the second circumscribing circle having the largest diameter among the plurality of second circumscribing circles is 5 or more, and the ratio of the length of the major axis of the second type regulating particle 1012b to the diameter of the second circumscribing circle having the largest diameter among the plurality of second circumscribing circles is 50 or less, Each of the first type regulating particles 1012a has a first particle size value, the first particle size values ​​of all the first type regulating particles 1012a are distributed in a certain range, all the first type regulating particles 1012a correspond to one first median particle size value, and among all the first type regulating particles 1012a, the first particle size values ​​of 80% or more of the first type regulating particles 1012a are located within 50% to 140% of the range of the first median particle size value; Each of the second type regulating particles 1012b has a second particle size value, the second particle size values ​​of all of the second type regulating particles 1012b are distributed within a certain range, all of the second type regulating particles 1012b correspond to one second central particle size value, and the second particle size values ​​of more than 80% of all the second type regulating particles 1012b are within the range of 50% to 140% of the second central particle size value.

[0018] In an embodiment of the present invention, the particle size distribution range of the regulating particles 1012 added to the substrate 1011 of the optical film 101 is controlled so that the particle size values ​​of the majority of the regulating particles 1012 are close to the median particle size value, thereby improving the product stability of the optical film 101 and improving the stability of the product quality of a display device equipped with the optical film 101.

[0019] Next, the technical solutions of the present invention will be described with reference to specific embodiments.

[0020] In this embodiment, the particle size value of the regulating particles 1012 is the actual particle size value of the regulating particles 1012. The particle size distribution curve of the regulating particles 1012 can be obtained by performing particle size statistics on the actual particle size values ​​of the regulating particles 1012 in the optical film 101. The particle size value of the regulating particles 1012 corresponding to 50% of the volume distribution in the particle size distribution curve is the median particle size value of the regulating particles 1012. When the regulating particles 1012 include types of regulating particles 1012 with significantly different ratios of the major axis length to the diameter, the different types of regulating particles 1012 are individually statistically analyzed. Specifically, the ratio of the length of the major axis of the first type regulating particle 1012a to the diameter of the first type regulating particle 1012a is 1 or more, the ratio of the length of the major axis of the first type regulating particle 1012a to the diameter of the first type regulating particle 1012a is less than 5, each of the first type regulating particles 1012a has a first particle size value, the first particle size values ​​of all the first type regulating particles 1012a are distributed within a certain range, all the first type regulating particles 1012a correspond to one first median particle size value, the first particle size value of each of the first type regulating particles 1012a is the same as the length of the major axis of each of the first type regulating particles 1012a, and the first particle size values ​​of 80% or more of the first type regulating particles 1012a among all the first type regulating particles 1012a are located within 50% to 140% of the range of the first median particle size value.The ratio of the length of the major axis of the second type regulating particle 1012b to the diameter of the second type regulating particle 1012b is 5 or more, the ratio of the length of the major axis of the second type regulating particle 1012b to the diameter of the second type regulating particle 1012b is 50 or less, each of the second type regulating particles 1012b has a second particle size value, the second particle size values ​​of all of the second type regulating particles 1012b are distributed within a certain range, the second particle size value of each of the second type regulating particles 1012b is the same as the length of the major axis of each of the second type regulating particles 1012b, all of the second type regulating particles 1012b correspond to one second median particle size value, and the second particle size values ​​of 80% or more of the second type regulating particles 1012b are within the range of 50% to 140% of the second median particle size value.

[0021] In some embodiments, the particle size distribution of the regulating particles 1012 can be determined by sieving. Specifically, the regulating particles 1012 are placed on a sieve surface with sieve holes of a certain pore size, and the particle size value of the regulating particles 1012 passing through the sieve holes is smaller than the pore size of the sieve holes, and the particle size value of the regulating particles 1012 captured on the sieve surface is larger than the pore size of the sieve holes. By repeating sieving and replacing the sieve surface with a different pore size, the particle size distribution of the regulating particles 1012 can be obtained. When the regulating particles 1012 include the first type regulating particles 1012a and the second type regulating particles 1012b, the particle size difference between the first type regulating particles 1012a and the second type regulating particles 1012b can be used to first distinguish between the two, and then the first type regulating particles 1012a and the second type regulating particles 1012b can be repeatedly sieved respectively to obtain the particle size distributions of the first type regulating particles 1012a and the second type regulating particles 1012b respectively.

[0022] In some embodiments, the particle size distribution of the regulating particles 1012 can be obtained by measuring the morphology of the regulating particles 1012 using an optical microscope or an electron microscope. Specifically, an electron microscope result including a plurality of the regulating particles 1012 can be obtained through an electron microscope (such as a scanning electron microscope), and the particle size values ​​of the plurality of the regulating particles 1012 can be measured using specialized particle size measurement software (such as Nano Measurer) to obtain the particle size distribution of the regulating particles 1012. When the regulating particles 1012 include the first type regulating particles 1012a and the second type regulating particles 1012b, the particle size distribution of the first type regulating particles 1012a and the particle size distribution of the second type regulating particles 1012b can be obtained simultaneously by an optical microscope or an electron microscope, and it is not necessary to first distinguish the first type regulating particles 1012a and the second type regulating particles 1012b and then sieve them separately to obtain the respective particle size distributions, as in the sieving method.

[0023] In some embodiments, the particle size distribution of the regulating particle 1012 can be obtained by both sieving and microscopy. For example, the sieving method can obtain the approximate shape of the particle size distribution curve of the regulating particle 1012, and the microscopy method can obtain and adjust the particle size value corresponding to each point of the particle size distribution curve of the regulating particle 1012.

[0024] In this embodiment, the particle size values ​​of more than 80% of the regulating particles 1012 are within 50% to 140% of the range of the median particle size value, that is, if the median particle size value of the regulating particles 1012 is D, then 50% x D ≦ particle size value of 80% of the regulating particles 1012 in the optical film 101 ≦ 140% x D. When the regulating particles 1012 include types of regulating particles 1012 with significantly different ratios of major axis length to diameter, the different types of regulating particles 1012 are controlled individually. Specifically, each of the first type regulating particles 1012a has a first particle size value, all of the first type regulating particles 1012a correspond to one first central particle size value, and the particle size values ​​of 80% or more of the first type regulating particles 1012a are located within 50% to 140% of the first central particle size value range, that is, when the first central particle size value of the first type regulating particles 1012a is D1, 50%×D1≦the first particle size value of 80% of the first type regulating particles 1012a in the optical film 101≦140%×D1; and / or, each of the second type regulating particles 1012b has a second particle size value, all of the second type regulating particles 1012b correspond to one second central particle size value, and the second particle size values ​​of more than 80% of the second type regulating particles 1012b among the second type regulating particles 1012b are located within 50% to 140% of the range of the second central particle size value, that is, if the second central particle size value of the second type regulating particles 1012b is D2, 50% × D2 ≦ the second particle size value of 80% of the second type regulating particles 1012b in the optical film 101 ≦ 140% × D2.

[0025] In some embodiments, the particle size value of 80% of the regulating particles 1012 in the optical film 101 may correspond to the particle size value of the regulating particles 1012 corresponding to the volume distribution range of 10% to 90% in the particle size distribution curve of the regulating particles 1012 in the optical film 101.

[0026] In this embodiment, the optical film 101 is formed by adding the regulating particles 1012 to the substrate 1011 and then undergoing a process such as stretching. In the process of forming the optical film 101, the substrate 1011 forms crystals with each of the regulating particles 1012 as a nucleus. However, the degree of crystallization formed with the regulating particles 1012 of different particle sizes as nuclei is different. Therefore, if the particle size distribution of the regulating particles 1012 in the optical film 101 is wide, it is difficult to control the product quality of the formed optical film 101 and the stability of the optical effect achieved. By setting the particle size value of the regulating particles 1012 of 80% or more, for example 85%, 90%, 95%, 100%, etc., of the regulating particles 1012 within the range of 50% to 140% of the central particle size value, the crystallization degree of the substrate 1011 with the regulating particles 1012 as a nucleus in the process of forming the optical film 101 can be made uniform, and the product quality and stability of the optical performance of the optical film 101 can be improved.

[0027] Preferably, the particle size values ​​of 80% or more of the regulating particles 1012 are within 70% to 110% of the range of the median particle size value, that is, when the median particle size value of the regulating particles 1012 is D, 70% x D ≦ particle size value of 80% of the regulating particles 1012 in the optical film 101 ≦ 110% x D. When the regulating particles 1012 include types of regulating particles 1012 with significantly different ratios of major axis length to diameter, the different types of regulating particles 1012 are controlled individually. Specifically, each of the first type regulating particles 1012a has a first particle size value, and all of the first type regulating particles 1012a correspond to one first central particle size value. The first particle size values ​​of 80% or more of the first type regulating particles 1012a among the first type regulating particles 1012a are within the range of 70% to 110% of the first central particle size value. In other words, when the first central particle size value of the first type regulating particles 1012a is D1, 70%×D1≦the first particle size value of 80% of the first type regulating particles 1012a in the optical film 101≦110%×D1. And / or, each of the second type regulating particles 1012b has a second particle size value, all of the second type regulating particles 1012b correspond to one second central particle size value, and the second particle size values ​​of more than 80% of the second type regulating particles 1012b among the second type regulating particles 1012b are within the range of 70% to 110% of the second central particle size value, that is, if the second central particle size value of the second type regulating particles 1012b is D2, 70% x D2 ≦ the second particle size value of 80% of the second type regulating particles 1012b in the optical film 101 ≦ 110% x D2. By setting the particle size value of the adjustment particles 1012 to be within the range of 70% to 110% of the median particle size value for 80% or more of the adjustment particles 1012, for example 85%, 90%, 95%, 100%, etc., the crystallization degree of the substrate 1011 with the adjustment particles 1012 as the core in the formation process of the optical film 101 can be made more uniform, and the product quality and stability of the optical performance of the optical film 101 can be improved.

[0028] In some embodiments, the optical film 101 has an in-plane retardation value, and the in-plane retardation value of the optical film 101 is less than 3000 nanometers. The in-plane retardation value of the optical film 101 is the retardation value of the optical film 101 in the plane in which the optical film 101 is disposed, and the plane in which the optical film 101 is disposed is perpendicular to the thickness direction of the optical film 101. The optical film 101 has a thickness direction retardation value in the thickness direction of the optical film 101. When light passes through the optical film 101, a difference between the refractive index of light in the plane where the optical film 101 is disposed and the refractive index of light in the thickness direction of the optical film 101 causes a difference between the in-plane retardation value of the optical film 101 and the retardation value in the thickness direction. When the in-plane retardation value of the optical film 101 is 3000 nanometers or more, the difference between the in-plane retardation value of the optical film 101 and the retardation value in the thickness direction of the optical film 101 is too large, so that a rainbow pattern phenomenon occurs when light passes through the optical film 101 and is observed in a large angle direction (for example, 45 degrees, 60 degrees, etc. with respect to the thickness direction of the optical film 101). By adding the regulating particles 1012, the difference between the refractive index of light in the plane on which the optical film 101 is disposed and the refractive index of light in the thickness direction of the optical film 101 is reduced, and the in-plane retardation value of the optical film 101 is less than 3000 nanometers, thereby improving the problem of rainbow patterns in the large angle direction of the optical film 101 and improving the display quality of the display device equipped with the optical film 101.

[0029] In some embodiments, the in-plane retardation value of the optical film 101 can be calculated by the following formula: Re=d×|n x -n y | Here, Re represents the in-plane retardation value of the optical film 101, and n x represents the extraordinary refractive index, and n y represents the ordinary refractive index, and d represents the thickness of the optical film 101 .

[0030] In some embodiments, the in-plane retardation value of the optical film 101 can be calculated from the difference between the extraordinary refractive index and the ordinary refractive index of the optical film 101 obtained by a retardation measuring device (e.g., Shintech's Optipro-micro, etc.) under a continuous spectrum white light source, and therefore the in-plane retardation value of the optical film 101 can be calculated by the above formula.

[0031] In some embodiments, the retardation in the thickness direction of the optical film 101 is determined by the two pairs of refractive index anisotropy values ​​ΔN xz =Δ|n x -n z |, ΔN yz =Δ|n y -n z and the thickness of the optical film 101, z is the refractive index in the thickness direction of the optical film 101.

[0032] In some embodiments, 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 1000 nm, which is advantageous in further reducing the difference between the in-plane retardation value of the optical film 101 and the retardation value in the thickness direction of the optical film 101, for example, 20 nanometers, 50 nanometers, 100 nanometers, 120 nanometers, 150 nanometers, 200 nanometers, 220 nanometers, 250 nanometers, 300 nanometers, 320 nanometers, 350 nanometers, 400 nanometers. 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., so as to effectively improve the rainbow pattern problem of the optical film 101 in a large angle direction, and improve the display quality of the display device including the optical film 101. Preferably, the in-plane retardation value of the optical film 101 is equal to or greater than 0 nm, and the in-plane retardation value of the optical film 101 is equal to or less than 500 nm, so as to more effectively improve the rainbow pattern problem of the optical film 101 in a large angle direction, and improve the display quality of the display device including the optical film 101. More preferably, the in-plane retardation value of the optical film 101 is not less than 0 nanometers, and the in-plane retardation value of the optical film 101 is not more than 200 nanometers, so that the range of the in-plane retardation value of the optical film 101 is closest to the range of the retardation value in the thickness direction of the optical film 101, thereby most effectively improving the problem of rainbow patterns of the optical film 101 in large angle directions, and improving the display quality of a display device including the optical film 101.

[0033] In some embodiments, the closer the ratio of the in-plane retardation value of the optical film 101 to the retardation value in the thickness direction of the optical film 101 is to 1, the smaller the difference between the refractive index of light in the plane where the optical film 101 is disposed and the refractive index of light in the thickness direction of the optical film 101 is, which is advantageous for solving the problem of rainbow patterns. The ratio of the in-plane retardation value of the optical film 101 to the retardation value in the thickness direction of the optical film 101 is greater than 0.1, and the ratio of the in-plane retardation value of the optical film 101 to the retardation value in the thickness direction of the optical film 101 is less than 2, for example, 0.2, 0.5, 0.6, 0.8, 1, 1.2, 1.4, 1.5, 1.6, 1.8, etc., which can effectively improve the problem of rainbow patterns. Preferably, the problem of rainbow patterns can be basically avoided if the ratio of the in-plane retardation value of the optical film 101 to the retardation value in the thickness direction of the optical film 101 is 0.5 or more and 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 1.5 or less. More preferably, the ratio of the in-plane retardation value of the optical film 101 to the retardation value in the thickness direction of the optical film 101 is 0.6 or more and 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 1.2 or less, the problem of rainbow patterns can be completely solved.

[0034] In some embodiments, the regulating particle 1012 has a major axis and a diameter, the length of the major axis of the regulating particle 1012 is the distance between the two end points of the major axis of the regulating particle 1012, and the length of the major axis of the regulating particle 1012 is the particle size value of the regulating particle 1012. Each of the regulating particles 1012 has multiple cross sections in an extension direction perpendicular to the major axis of the regulating particle, each cross section has one circumscribing circle, and the diameter of the regulating particle 1012 corresponds to the diameter of the circumscribing circle with the largest diameter among the multiple cross sections. Here, the two most distant points in the cross section of the regulating particle 1012 are located on the circumscribing circle of the cross section, and the distance between the two most distant points in the cross section is the diameter of the circumscribing circle.

[0035] In some embodiments, the first size value of each of the first type regulating particles 1012a is the same as the length of the major axis of each of the first type regulating particles 1012a, the first median size value of the first type regulating particles 1012a is less than 20 microns, e.g., 0.5 microns, 1 micron, 3 microns, 5 microns, 8 microns, 10 microns, 12 microns, 15 microns, 18 microns, etc., and / or the first size value of each of the first type regulating particles 1012a and the size value of each of the second type regulating particles 1012b are equal to or greater than the length of the major axis of the second type regulating particles 1012b. The length of the axis is the same as the second median particle size value of the second type of regulating particles 1012b, and the second median particle size value of the second type of regulating particles 1012b is less than 20 microns, for example, 0.5 microns, 1 micron, 3 microns, 5 microns, 8 microns, 10 microns, 12 microns, 15 microns, 18 microns, etc., so that the sieving method can quickly obtain the first type of regulating particles 1012a having a particle size value close to the first median particle size value and / or the second type of regulating particles 1012b having a particle size value close to the second median particle size value, which is advantageous for mass production of the optical film 101.

[0036] Referring to FIG. 1, the regulatory particles 1012 include a first type of regulatory particle 1012a. Here, the first type regulating particle 1012a has a plurality of first cross sections, each of the first cross sections has one first circumscribing circle, the ratio of the length of the major axis of the first type regulating particle 1012a to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is 1 or more, and the ratio of the length of the major axis of the first type regulating particle 1012a to the diameter of the first circumscribing circle with the largest diameter among the plurality of first circumscribing circles is less than 5, for example, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.2, 2.5, 2.8, 3, 3.5, 4, 4.5, etc., and the first cross sections are perpendicular to the extension direction of the major axis of the second type regulating particle 1012b. By including the first type of regulating particles 1012a having a small aspect ratio (the ratio of the length of the major axis to the diameter of the first circumscribing circle having the largest diameter) in the regulating particles 1012, it is advantageous to effectively reduce the in-plane retardation value of the optical film 101 to 3,000 nanometers or less, and is advantageous to effectively reduce the difference between the in-plane retardation value of the optical film 101 and the retardation value in the thickness direction of the optical film 101, thereby improving the problem of rainbow patterns in the optical film 101 and improving the display quality of a display device equipped with the optical film 101.

[0037] In some embodiments, the first type of regulatory particle 1012a is selected from at least one of a first subtype of regulatory particle, a second subtype of regulatory particle, a third subtype of regulatory particle, a fourth subtype of regulatory particle, and a fifth subtype of regulatory particle having different shapes. Here, along the extension direction of the long axis of the first subtype regulatory particle, the change in diameter of the first circumscribing circle of the first cross section of the first subtype regulatory particle is 0.3 microns or less, for example, 0 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. In some embodiments, along the extension direction of the long axis of the first subtype regulatory particle, the diameter of the first circumscribing circle of the first cross section located at the first end of the first subtype regulatory particle is the same as the diameter of the first circumscribing circle of the first cross section located at the center of the first subtype regulatory particle, and the diameter of the first circumscribing circle of the first cross section located at the second end of the first subtype regulatory particle is the same as the diameter of the first circumscribing circle of the first cross section located at the center of the first subtype regulatory particle.

[0038] In some embodiments, the first cross-section of the first sub-type of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, etc., or may be an irregular shape. In some embodiments, the first subtype of regulating particles are cubic or rectangular particles, the first cross-section of the first subtype of regulating particles is a square or rectangular, and the diameter of a first circumscribing circle of any of the first cross-sections of the first subtype of regulating particles is the diagonal length of the square or rectangle formed by the first cross-section.

[0039] It is more preferable that the ratio of the length of the major axis of the first subtype regulatory particle to the diameter of the first circumscribing circle with the largest diameter among the first circumscribing circles of the multiple first cross sections of the first subtype regulatory particle is close to 1, and may be, for example, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.2, 2.5, 3, etc. The first end of the second subtype regulating particle is connected to the second end of the second subtype regulating particle, and along the direction away from the second end of the second subtype regulating particle, the diameter of the first circumscribing circle of the first cross-section located at the first end of the second subtype regulating particle gradually decreases, and along the direction away from the first end of the second subtype regulating particle, the diameter of the first circumscribing circle of the first cross-section located at the second end of the second subtype regulating particle gradually decreases.

[0040] The gradual decrease in diameter of the first circumscribing circle of the first cross section located at the first end of the second subtype regulating particle along the direction away from the second end of the second subtype regulating particle means a tendency for the diameter of the first circumscribing circle of the first cross section located at the first end of the second subtype regulating particle to decrease in the direction away from the second end of the second subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in the diameter of the first circumscribing circle of the first cross section located at the first end of the second subtype regulating particle in the direction away from the second end of the second subtype regulating particle.

[0041] The gradual decrease in diameter of the first circumscribing circle of the first cross section located at the second end of the second subtype regulating particle along the direction away from the first end of the second subtype regulating particle means a tendency for the diameter of the first circumscribing circle of the first cross section located at the second end of the second subtype regulating particle to decrease in the direction away from the first end of the second subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in diameter of the first circumscribing circle of the first cross section located at the second end of the second subtype regulating particle in the direction away from the first end of the second subtype regulating particle.

[0042] In some embodiments, the first cross-section of the second sub-type of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, etc., or may be an irregular shape. In some embodiments, the second subtype regulatory particle is a spherical particle or an ellipsoidal particle, and the first cross-section of the second subtype regulatory particle is a circle or an ellipsoid. If the first cross-section of the second subtype regulatory particle is an ellipsoid, the ratio of the major axis of the ellipse formed by any of the first cross-sections of the second subtype regulatory particle to the minor axis of the ellipse is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. If the second subtype regulatory particle is a spherical particle, any of the first cross-sections of the second subtype regulatory particle is a circle, a first circumscribing circle of any of the first cross-sections coincides with the first cross-section, and the ratio of the major axis of the second subtype regulatory particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first cross-sections of the second subtype regulatory particle is 1.

[0043] It is preferable that the ratio of the length of the major axis of the second subtype regulating particle to the diameter of the first circumscribing circle with the largest diameter among the multiple first circumscribing circles of the second subtype regulating particle is close to 1, and if the second subtype regulating particle is an ellipsoidal particle, it is more preferable that its shape is an approximately spherical particle, i.e., the closer the length of the major axis of the second subtype regulating particle is to the diameter of the second subtype regulating particle, the more preferable. Preferably, the ratio of the length of the major axis of the second subtype regulatory particle to the diameter of the first circumscribing circle with the largest diameter among the multiple first circumscribing circles of the second subtype regulatory particle is 1 or more, and the ratio of the length of the major axis of the second subtype regulatory particle to the diameter of the first circumscribing circle with the largest diameter among the multiple first circumscribing circles of the second subtype regulatory particle is 3 or less; more preferably, the ratio of the length of the major axis of the second subtype regulatory particle to the diameter of the first circumscribing circle with the largest diameter among the multiple first circumscribing circles of the second subtype regulatory particle is 1 or more, and the ratio of the length of the major axis of the second subtype regulatory particle to the diameter of the first circumscribing circle with the largest diameter among the multiple first circumscribing circles of the second subtype regulatory particle is 1.5 or less.

[0044] Along the extension direction of the long axis of the third subtype regulatory particle, the change in diameter of the first circumscribing circle of the first cross section located in the central part of the third subtype regulatory particle is 1 micron or less, for example, 0 microns, 0.95 microns, 0.8 microns, 0.78 microns, 0.75 microns, 0.72 microns, 0.7 microns, 0.68 microns, 0.65 microns, 0.62 microns, 0.6 microns, 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. Along a direction away from the center of the third subtype regulatory particle, the diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulatory particle gradually decreases, and the change in diameter of the second end of the third subtype regulatory particle is 1 micron or less, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, 0.68 micron, 0.65 micron, 0.62 micron, 0.6 The diameter may be 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc.In some embodiments, along a direction away from the central portion of the third subtype regulatory particle, the diameter of the first circumscribing circle of the first cross-section located at the first end of the third subtype regulatory particle gradually decreases, and the diameter of the first circumscribing circle of the first cross-section located at the second end of the third subtype regulatory particle is the same as the diameter of the first circumscribing circle of the first cross-section located at the central portion of the third subtype regulatory particle.

[0045] The gradual decrease in diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulating particle along the direction away from the central portion of the third subtype regulating particle means a tendency for the diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulating particle to decrease in the direction away from the central portion of the third subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in the diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulating particle in the direction away from the central portion of the third subtype regulating particle.

[0046] In some embodiments, the first cross-section of the third sub-type of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, etc., or may be an irregular shape. In some embodiments, the third subtype of regulatory particles may be needle-like particles with a reduced diameter at one end.

[0047] In some embodiments, when the third subtype regulatory particle is a needle-like particle with a reduced diameter at one end, the first cross-section of the third subtype regulatory particle may be circular or elliptical, and when the first cross-section located at the second end of the third subtype regulatory particle or the first cross-section located at the center of the third subtype regulatory particle is elliptical, the ratio of the major axis of this ellipse to the minor axis of the ellipse of any of the first cross-sections located at the second end or the center of the third subtype regulatory particle is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The shape of the first cross-section located at the first end of the third subtype regulatory particle is consistent with the shape of the first cross-section located at the center of the third subtype regulatory particle, with the area gradually decreasing along a direction away from the center of the third subtype regulatory particle.

[0048] Along the extension direction of the long axis of the fourth subtype regulatory particle, the change in diameter of the first circumscribing circle of the first cross section located in the center of the fourth subtype regulatory particle is 1 micron or less, for example, 0 microns, 0.95 microns, 0.8 microns, 0.78 microns, 0.75 microns, 0.72 microns, 0.7 microns, 0.68 microns, 0.65 microns, 0.62 microns, 0.6 microns, 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0. 35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc., and along a direction away from the center of the fourth subtype regulatory particle, the diameter of the first circumscribing circle of the first cross-section located at the first end of the fourth subtype regulatory particle gradually decreases, and the diameter of the first circumscribing circle of the first cross-section located at the second end of the fourth subtype regulatory particle gradually decreases. In some embodiments, along the extension direction of the major axis of the fourth subtype regulatory particle, the diameter of the first circumscribing circle of the first cross-section located at the center of the fourth subtype regulatory particle is uniform, and the diameters of the first circumscribing circle of the first cross-section located at the first end of the fourth subtype regulatory particle and the second end of the fourth subtype regulatory particle gradually change.

[0049] The gradual decrease in diameter of the first circumscribing circle of the first cross-section located at the first end of the fourth subtype regulating particle along the direction away from the central portion of the fourth subtype regulating particle means that the diameter of the first circumscribing circle of the first cross-section located at the first end of the fourth subtype regulating particle shows a tendency to decrease in diameter in the direction away from the central portion of the fourth subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in diameter of the first circumscribing circle of the first cross-section located at the first end of the fourth subtype regulating particle in the direction away from the central portion of the fourth subtype regulating particle.

[0050] The gradual decrease in diameter of the first circumscribing circle of the first cross section located at the second end of the fourth subtype regulating particle along the direction away from the central portion of the fourth subtype regulating particle means that the diameter of the first circumscribing circle of the first cross section located at the second end of the fourth subtype regulating particle shows a tendency to decrease in diameter in the direction away from the central portion of the fourth subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in diameter of the first circumscribing circle of the first cross section located at the second end of the fourth subtype regulating particle in the direction away from the central portion of the fourth subtype regulating particle.

[0051] In some embodiments, the first cross-section of the fourth sub-type of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, etc., or may be an irregular shape. In some embodiments, the fourth sub-type of regulatory particle may be a needle-like particle with a reduced diameter at both ends.

[0052] In some embodiments, when the fourth subtype regulatory particle is an acicular particle with a diameter decreasing at both ends, the shape of the first cross-section of the fourth subtype regulatory particle may be circular or elliptical, and when the first cross-section located at the center of the fourth subtype regulatory particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse formed by any of the first cross-sections located at the center of the fourth subtype regulatory particle is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The shape of the first cross-section located at the first end of the fourth subtype regulatory particle and the second end of the fourth subtype regulatory particle are consistent with the shape of the first cross-section located at the center of the fourth subtype regulatory particle, and the area gradually decreases along a direction away from the center of the fourth subtype regulatory particle.

[0053] The first end of the fifth subtype regulatory particle is connected to the second end of the fifth subtype regulatory particle, and along the direction from the first end of the fifth subtype regulatory particle to the second end of the fifth subtype regulatory particle, the diameter of the first circumscribing circle of the first cross section of the fifth subtype regulatory particle gradually decreases.

[0054] The gradual decrease in the diameter of the first circumscribing circle of the first cross section of the fifth subtype regulating particle along the direction from the first end of the fifth subtype regulating particle to the second end of the fifth subtype regulating particle means that the diameter of the first circumscribing circle of the first cross section of the fifth subtype regulating particle shows a tendency to decrease in the direction from the first end of the fifth subtype regulating particle to the second end of the fifth subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in the diameter of the first circumscribing circle of the first cross section of the fifth subtype regulating particle in the direction from the first end of the fifth subtype regulating particle to the second end of the fifth subtype regulating particle.

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

[0056] In some embodiments, when the fifth subtype regulatory particle is a pyramidal particle, the first cross-section of the fifth subtype regulatory particle is circular or elliptical. Along a direction from the first end of the fifth subtype regulatory particle to the second end of the fifth subtype regulatory particle, the shape of the first cross-section of the fifth subtype regulatory particle is constant and its area gradually decreases. When the first cross-section of the fifth subtype regulatory particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse formed by any of the first cross-sections of the fifth subtype regulatory particle 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.

[0057] In some embodiments, compared with the third subtype, the fourth subtype, and the fifth subtype, the first subtype and the second subtype have better improving effects in 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, and the improving effect of the second subtype is better than that of the first subtype. Therefore, preferably, the regulating particles 1012 include the first subtype and / or the second subtype. When the regulating particles 1012 include the first subtype and the second subtype, the mass fraction of the first subtype in the regulating particles 1012 is greater than the mass fraction of the second subtype in the regulating particles 1012. Preferably, the first type regulating particles 1012a are composed of the second subtype and / or the first subtype. More preferably, said first type of regulatory particle 1012a is composed of said second subtype of regulatory particle.

[0058] Referring to FIG. 1, in some embodiments, the regulatory particles 1012 may consist of the first type of regulatory particle 1012a.

[0059] Referring to FIG. 2, in some embodiments, the modulation particles 1012 include a second type of modulation particles 1012b to improve the chromaticity viewing angle and contrast of the optical film 101 while reducing the rainbow pattern problem of the optical film 101. Here, the second type regulating particle 1012b has a plurality of second cross sections, each of the second cross sections has one second circumscribing circle, the ratio of the length of the long axis of the second type regulating particle 1012b to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is 5 or more, and the ratio of the length of the long axis of the second type regulating particle 1012b to the diameter of the second circumscribing circle with the largest diameter among the plurality of second circumscribing circles is less than 100, for example, 10, 12, 15, 16, 18, 20, 30, 32, 34, 35, 36, 38, 40, 42, 45, 46, 48, 50, 52, 55, 56, 58, 60, 62, 65, 68, 70, 80, 90, etc., and the second cross sections are perpendicular to the extension direction of the long axis of the second type regulating particle 1012b. The diameter of the second circumscribing circle of the second cross section of the second type modulation particle 1012b is the distance between the two farthest points in the second cross section. Using the second type modulation particle 1012b with a large aspect ratio (the ratio of the length of the major axis to the diameter of the second circumscribing circle with the largest diameter) makes it easier for more light to change the propagation direction through the modulation particle 1012, which is advantageous in improving the rainbow problem while obtaining the improvement effect of the modulation particle 1012 on chromaticity viewing angle and contrast.

[0060] The second type regulating particles 1012b have a slightly weaker effect of 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 first type regulating particles 1012a, and the chromaticity viewing angle of the optical film 101 can be significantly improved with a smaller amount of the second type regulating particles 1012b. Therefore, the mass fraction of the second type regulating particles 1012b in the regulating particles 1012 is smaller than the mass fraction of the first type regulating particles 1012a in the regulating particles 1012. For example, the mass fraction of the first type regulating particles 1012a in the regulating particles 1012 is greater than 50%, and the mass fraction of the second type regulating particles 1012b in the regulating particles 1012 is less than 50%. The mass fraction of the first type of regulatory particle 1012a in the regulatory particle 1012 may be 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 99%, etc.

[0061] In some embodiments, the second type of regulatory particle 1012b particles are selected from at least one of a sixth subtype regulatory particle, a seventh subtype regulatory particle, an eighth subtype regulatory particle, a ninth subtype regulatory particle, and a tenth subtype regulatory particle having a different shape; Here, along the extension direction of the long axis of the sixth subtype regulatory particle, the change in diameter of the second circumscribing circle of the second cross section of the sixth subtype regulatory particle is 0.3 microns or less, for example, 0 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. In some embodiments, along the extension direction of the long axis of the sixth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the sixth subtype regulatory particle is the same as the diameter of the second circumscribing circle of the second cross section of the central part of the sixth subtype regulatory particle, and the diameter of the second circumscribing circle located at the second end of the sixth subtype regulatory particle is the same as the diameter of the second circumscribing circle of the central part of the sixth subtype regulatory particle.

[0062] In some embodiments, the second cross-section of the sixth sub-type regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, etc., or may be an irregular shape. In some embodiments, the sixth subtype regulatory particle may be a rod-shaped particle, and when the sixth subtype regulatory particle is rod-shaped, the second cross-section of the sixth subtype regulatory particle may be circular or elliptical. When the second cross-section of the sixth subtype regulatory particle is circular, the second circumscribing circle of the second cross-section of the sixth subtype regulatory particle may coincide with the second cross-section. When the second cross-section of the sixth subtype regulatory particle is elliptical, the diameter of the second circumscribing circle of each of the second cross-sections of the sixth subtype regulatory particle is the length of the major axis of the ellipse formed by each of the second cross-sections of the sixth subtype regulatory particle, and the ratio of the major axis of the ellipse formed by the second cross-section of the sixth subtype regulatory particle to the minor axis of the ellipse formed by the second cross-section of the sixth subtype regulatory particle may be greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0063] Along the extension direction of the long axis of the seventh subtype regulatory particle, the change in diameter of the second circumscribing circle of the second cross section located in the central part of the seventh subtype regulatory particle is 1 micron or less, for example, 0 microns, 0.95 microns, 0.8 microns, 0.78 microns, 0.75 microns, 0.72 microns, 0.7 microns, 0.68 microns, 0.65 microns, 0.62 microns, 0.6 microns, 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. Along a direction away from the center of the seventh subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the seventh subtype regulatory particle gradually decreases, and the change value of the diameter of the second end of the seventh subtype regulatory particle is 1 micron or less, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, 0.68 micron, 0.65 micron, 0.62 micron, 0.6 The diameter may be 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc.In some embodiments, along a direction away from the central portion of the seventh subtype regulatory particle, the diameter of the second circumscribing circle of the second cross-section located at the first end of the seventh subtype regulatory particle gradually decreases, and the diameter of the second circumscribing circle of the second cross-section located at the second end of the seventh subtype regulatory particle is the same as the diameter of the second circumscribing circle of the second cross-section located at the central portion of the seventh subtype regulatory particle.

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

[0065] In some embodiments, the second cross-section of the seventh sub-type regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, etc., or may be an irregular shape. In some embodiments, the seventh sub-type of regulatory particle may be a needle-like particle with a reduced diameter at one end.

[0066] In some embodiments, when the seventh subtype regulatory particle is a needle-like particle with a reduced diameter at one end, the second cross-section of the seventh subtype regulatory particle may be circular or elliptical, and when the second cross-section located at the second end of the seventh subtype regulatory particle or the second cross-section located at the center of the seventh subtype regulatory particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse of any of the second cross-sections located at the second end or the center of the seventh subtype regulatory particle is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The shape of the second cross-section located at the first end of the seventh subtype regulatory particle is consistent with the shape of the second cross-section located at the center of the seventh subtype regulatory particle, with the area gradually decreasing along a direction away from the center of the seventh subtype regulatory particle.

[0067] Along the extension direction of the long axis of the regulatory particle of the eighth subtype, the change in diameter of the second circumscribing circle of the second cross section located in the center of the regulatory particle of the eighth subtype is 1 micron or less, for example, 0 microns, 0.95 microns, 0.8 microns, 0.78 microns, 0.75 microns, 0.72 microns, 0.7 microns, 0.68 microns, 0.65 microns, 0.62 microns, 0.6 microns, 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0. 35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc., and along a direction away from the center of the eighth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross-section located at the first end of the eighth subtype regulatory particle gradually decreases, and the diameter of the second circumscribing circle of the second cross-section located at the second end of the eighth subtype regulatory particle gradually decreases. In some embodiments, along the extension direction of the major axis of the eighth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross-section located at the center of the eighth subtype regulatory particle is uniform, and the diameters of the second circumscribing circle of the second cross-section located at the first end of the eighth subtype regulatory particle and the second end of the eighth subtype regulatory particle gradually change.

[0068] The gradual decrease in the diameter of the second circumscribing circle of the second cross section located at the first end of the eighth subtype regulating particle along the direction away from the central portion of the eighth subtype regulating particle means that the diameter of the second circumscribing circle of the second cross section located at the first end of the eighth subtype regulating particle shows a tendency to decrease in the direction away from the central portion of the eighth subtype regulating particle, and can be understood to include, but is not limited to, the sequential decrease in the diameter of the second circumscribing circle of the second cross section located at the first end of the eighth subtype regulating particle in the direction away from the central portion of the eighth subtype regulating particle.

[0069] The gradual decrease in the diameter of the second circumscribing circle of the second cross section located at the second end of the eighth subtype regulating particle along the direction away from the central portion of the eighth subtype regulating particle means that the diameter of the second circumscribing circle of the second cross section located at the second end of the eighth subtype regulating particle shows a tendency to decrease in the direction away from the central portion of the eighth subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in the diameter of the second circumscribing circle of the second cross section located at the second end of the eighth subtype regulating particle in the direction away from the central portion of the eighth subtype regulating particle.

[0070] In some embodiments, the second cross-section of the eighth sub-type regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, etc., or may be an irregular shape. In some embodiments, the eighth sub-type of regulatory particle may be a needle-like particle with a reduced diameter at both ends.

[0071] In some embodiments, when the eighth subtype regulatory particle is a needle-like particle with a diameter decreasing at both ends, the shape of the second cross-section of the eighth subtype regulatory particle may be circular or elliptical, and when the second cross-section located at the center of the eighth subtype regulatory particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse formed by any of the second cross-sections located at the center of the eighth subtype regulatory particle is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The shape of the second cross-section located at the first end of the eighth subtype regulatory particle and the second end of the eighth subtype regulatory particle are consistent with the shape of the second cross-section located at the center of the eighth subtype regulatory particle, and the area gradually decreases along a direction away from the center of the eighth subtype regulatory particle.

[0072] The first end of the ninth subtype regulatory particle is connected to the second end of the ninth subtype regulatory particle, and along the direction from the first end of the ninth subtype regulatory particle to the second end of the ninth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section of the ninth subtype regulatory particle gradually decreases.

[0073] The gradual decrease in the diameter of the second circumscribing circle of the second cross section of the 9th subtype regulating particle along the direction from the first end of the 9th subtype regulating particle to the second end of the 9th subtype regulating particle means that the diameter of the second circumscribing circle of the second cross section of the 9th subtype regulating particle shows a tendency to decrease in the direction from the first end of the 9th subtype regulating particle to the second end of the 9th subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in the diameter of the second circumscribing circle of the second cross section of the 9th subtype regulating particle in the direction from the first end of the 9th subtype regulating particle to the second end of the 9th subtype regulating particle.

[0074] In some embodiments, the second cross-section of the ninth subtype of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, etc., or may be an irregular shape. In some embodiments, the ninth subtype of regulatory particles may be cone-shaped particles.

[0075] In some embodiments, when the ninth subtype regulatory particle is a cone-shaped particle, the second cross-section of the ninth subtype regulatory particle is circular or elliptical. Along a direction from the first end of the ninth subtype regulatory particle to the second end of the ninth subtype regulatory particle, the shape of the second cross-section of the ninth subtype regulatory particle is constant and its area gradually decreases. When the second cross-section of the ninth subtype regulatory particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse formed by any of the second cross-sections of the ninth subtype regulatory particle 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.

[0076] The first end of the tenth subtype regulatory particle is connected to the second end of the tenth subtype regulatory particle, and along the direction away from the second end of the tenth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the tenth subtype regulatory particle gradually decreases, and along the direction away from the first end of the tenth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the second end of the tenth subtype regulatory particle gradually decreases.

[0077] The gradual decrease in the diameter of the second circumscribing circle of the second cross section located at the first end of the tenth subtype regulating particle along the direction away from the second end of the tenth subtype regulating particle means that the diameter of the second circumscribing circle of the second cross section located at the first end of the tenth subtype regulating particle shows a tendency to decrease in the direction away from the second end of the tenth subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in the diameter of the second circumscribing circle of the second cross section located at the first end of the tenth subtype regulating particle in the direction away from the second end of the tenth subtype regulating particle.

[0078] The gradual decrease in the diameter of the second circumscribing circle of the second cross section located at the second end of the tenth subtype regulating particle along the direction away from the first end of the tenth subtype regulating particle means that the diameter of the second circumscribing circle of the second cross section located at the second end of the tenth subtype regulating particle shows a tendency to decrease in the direction away from the first end of the tenth subtype regulating particle, and can be understood to include, but is not limited to, a sequential decrease in the diameter of the second circumscribing circle of the second cross section located at the second end of the tenth subtype regulating particle in the direction away from the first end of the tenth subtype regulating particle.

[0079] In some embodiments, the second cross-section of the tenth subtype of regulatory particle may be a regular shape, such as a circle, an oval, a triangle, a square, etc., or may be an irregular shape. In some embodiments, the tenth sub-type of regulatory particles may be biconical particles and / or ellipsoidal particles.

[0080] In some embodiments, when the 10th subtype regulatory particle is a bipyramidal particle and / or an elliptical particle, the second cross-section of the 10th subtype regulatory particle is circular or elliptical. Along a direction away from the second end of the 10th subtype regulatory particle, the shape of the second cross-section located at the first end of the 10th subtype regulatory particle is constant and its area gradually decreases, and along a direction away from the first end of the 10th subtype regulatory particle, the shape of the second cross-section located at the second end of the 10th subtype regulatory particle is constant and its area gradually decreases. When the 10th subtype regulatory particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse formed by any of the second cross-sections of the 10th subtype regulatory particle 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.

[0081] The difference between when the 10th subtype regulating particle is a bipyramidal particle and when it is an elliptical particle is that when the 10th subtype regulating particle is a bipyramidal particle, the cross-section of the 10th subtype regulating particle in a direction parallel to the long axis of the 10th subtype regulating particle is a polygon such as a triangle or a rectangle, and when the 10th subtype regulating particle is an elliptical particle, the cross-section of the 10th subtype regulating particle in a direction parallel to the long axis of the 10th subtype regulating particle is an ellipse.

[0082] In some embodiments, when the regulatory particles 1012 include the first type of regulatory particles 1012a and the second type of regulatory particles 1012b, and the first type of regulatory particles 1012a includes the first subtype of regulatory particles and the second subtype of regulatory particles, the mass fraction of the second subtype of regulatory particles in the regulatory particles 1012 is greater than the mass fraction of the first subtype of regulatory particles in the regulatory particles 1012, and the mass fraction of the first subtype of regulatory particles in the regulatory particles 1012 is greater than or equal to the mass fraction of the second type of regulatory particles 1012b in the regulatory particles 1012.

[0083] In some embodiments, the mass fraction of the first subtype of regulatory particles in the regulatory particle 1012 may be 50% or more, such as 55%, 60%, 70%, 75%, 80%, 85%, 90%, 95%, 99%, 100%, etc. The mass fraction of the second subtype of regulatory particles in the regulatory particle 1012 may be 25% or less, such as 20%, 15%, 10%, 5%, 3%, 1%, 0%, etc. The mass fraction of the second type of regulatory particles 1012b in the regulatory particle 1012 may be 25% or less, such as 20%, 15%, 10%, 5%, 3%, 1%, 0%, etc.

[0084] In some embodiments, the second type of regulatory particles 1012b are selected from at least two of the third subtype of regulatory particles, the fourth subtype of regulatory particles, the fifth subtype of regulatory particles, the sixth subtype of regulatory particles, and the seventh subtype of regulatory particles, and preferably the second type of regulatory particles 1012b are a mixture of the third subtype of regulatory particles, the fourth subtype of regulatory particles, and the fifth subtype of regulatory particles, or the second type of regulatory particles 1012b are a mixture of the third subtype of regulatory particles, the sixth subtype of regulatory particles, and the seventh subtype of regulatory particles, or the second type of regulatory particles 1012b are a mixture of the third subtype of regulatory particles, the fourth subtype of regulatory particles, the fifth subtype of regulatory particles, the sixth subtype of regulatory particles, and the seventh subtype of regulatory particles. By selecting the second type of regulating particles 1012b from at least two particles of different shapes, the diversity of shapes of the second type of regulating particles 1012b is increased, the optical anisotropy of the second type of regulating particles 1012b is increased, and the contrast and brightness improvement effect of the second type of regulating particles 1012b is improved.If the second type of regulatory particles 1012b is selected from the third subtype of regulatory particles, the fourth subtype of regulatory particles, and the fifth subtype of regulatory particles, or if the second type of regulatory particles 1012b is selected from the third subtype of regulatory particles, the sixth subtype of regulatory particles, and the seventh subtype of regulatory particles, or if the second type of regulatory particles 1012b is a mixture of the third subtype of regulatory particles, the fourth subtype of regulatory particles, the fifth subtype of regulatory particles, the sixth subtype of regulatory particles, and the seventh subtype of regulatory particles, the mass fraction of the third subtype of regulatory particles in the second type of regulatory particles 1012b is 1 % to 8%, for example, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 6.5%, 7%, 7.5%, etc., the mass fraction of the fourth subtype regulatory particles and / or the sixth subtype regulatory particles in the second type regulatory particles 1012b may be 40% to 50%, for example, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, etc., and the mass fraction of the fifth subtype regulatory particles and / or the seventh subtype regulatory particles in the second type regulatory particles 1012b may be 45% to 55%, for example, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, etc. By mixing the third subtype regulating particles, the fourth subtype regulating particles and / or the sixth subtype regulating particles, the fifth subtype regulating particles and / or the seventh subtype regulating particles in the above-mentioned ratios, the contrast and brightness enhancement effect of the resulting regulating particles 1012 can be further improved.

[0085] In some embodiments, the mass fraction of the regulating particles 1012 in the optical film 101 is 20% or less, 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 that the regulating particles 1012 are uniformly dispersed in the optical film 101, and the product stability of the optical film 101 is improved, while the optical performance of the optical film 101, such as the problem of rainbow pattern in a large angle direction, can be effectively improved, and the product quality and stability of the display device including the optical film 101 can be improved. The smaller the mass fraction of the regulating particles 1012 in the optical film 101, the more effectively the rainbow pattern of the optical film 101 in a large angle direction can be reduced, and the smaller the mass fraction, the better the dispersion. Preferably, the mass fraction of the regulating particles 1012 in the optical film 101 is 10% or less, more preferably, the mass fraction of the regulating particles 1012 in the optical film 101 is 5% or less, more preferably, the mass fraction of the regulating particles 1012 in the optical film 101 is 1% or less, more preferably, the mass fraction of the regulating particles 1012 in the optical film 101 is 0.05% or less. At the same time, in order to ensure that the number of the regulating particles 1012 in the optical film 101 is sufficient to effectively improve the rainbow pattern of the optical film 101 in a large angle direction, the mass fraction of the regulating particles 1012 in the optical film 101 may be 0.001% or more, preferably 0.003% or more, more preferably 0.005% or more, even more preferably 0.015% or more, more preferably 0.03% or more.

[0086] In some embodiments, the second type of regulating particles 1012b are whiskers. The material of the first type of regulating particles 1012a and the material of the second type of regulating particles 1012b are selected from at least one of silicon dioxide, silicon carbide, silicon nitride, zinc oxide, magnesium oxide, aluminum oxide, calcium sulfate, calcium carbonate, potassium titanate, aluminum borate, and a polymer (such as polystyrene).

[0087] In some embodiments, the second type regulating particles 1012b and / or the first type regulating particles 1012a may be surface modified to facilitate dispersion of the second type regulating particles 1012b and / or the first type regulating particles 1012a within the substrate 1011 or to enhance functionality, such as toughness, of the second type regulating particles 1012b and / or the first type regulating particles 1012a. When the second type regulating particle 1012b and / or the first type regulating particle 1012a are surface-modified, the surface of the second type regulating particle 1012b and / or the first type regulating particle 1012a 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 second type regulating particle 1012b and / or the first type regulating particle 1012a includes at least one of an inorganic cation group, an inorganic anion group, a polymer group, a coupling agent group, or a surfactant group.

[0088] Specifically, the surface of the second type regulating particle 1012b and / or the first type regulating particle 1012a is modified with at least one selected from magnesium chloride, calcium chloride, barium chloride, strontium chloride, stearic acid, sodium stearate, zinc stearate, sulfonic acid surfactant, thio surfactant, titanate, aluminate, polyacrylamide, silane, alkyl phosphate, aryl phosphate, alkyl phosphate, aryl phosphate, alkyl alcohol amide phosphate, imidazoline phosphate, imidazoline phosphate, high polyphosphate, high polyphosphate, and siloxane phosphate. Preferably, the surface of the second type regulating particle 1012b and / or the first type regulating particle 1012a is modified with at least one of sulfonic acid surfactant or thio surfactant. The sulfonic acid surfactant may be selected from at least one of alkyl sulfonate and fluoroalkyl sulfonate, specifically at least one of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, and sodium fluorododecyl sulfonate, and the thio surfactant may be selected from at least one of mercaptan and fluoromercaptan, specifically at least one of octane thiol, dodecane thiol, tetradecane thiol, octadecane thiol, fluorooctane thiol, and fluorododecane thiol. When the sulfonic acid surfactant is mixed with the regulating particle 1012 to be surface-modified, the sulfonic acid surfactant forms a sulfonic acid shell layer, such as a benzene ring sulfonic acid shell layer, on the surface of the whisker, which is advantageous for protecting the regulating particle 1012, increasing the toughness of the regulating particle 1012, and reducing the breakage of the second type regulating particle 1012b and / or the first type regulating particle 1012a in the optical film 101.When a thio-based surfactant group is mixed with the regulating particles 1012 to be surface-modified, the thio-based surfactant group and the hydroxyl groups on the whisker surface form an OSO cross-linked network, and the binding energy of OSO is relatively large, which is advantageous for protecting the second type regulating particles 1012b and / or the first type regulating particles 1012a during the process of mixing the second type regulating particles 1012b and / or the first type regulating particles 1012a with the material of the substrate 1011 to form the optical film 101, reducing damage to the second type regulating particles 1012b and / or the first type regulating particles 1012a, and improving the effect of the second type regulating particles 1012b and / or the first type regulating particles 1012a in improving optical functions such as contrast and brightness. More preferably, the second type regulating particles 1012b and / or the first type regulating particles 1012a are modified with at least one of a sulfonic acid surfactant having a fluorine substituent and a thio surfactant having a fluorine substituent, specifically at least one of sodium fluorododecylsulfonate, fluorooctanethiol, and fluorododecanethiol, wherein fluorine atoms are highly stable within alkyl chains, the bond energy of carbon-fluorine bonds is higher than that of carbon-carbon bonds, and carbon-fluorine bonds have the effect of shielding carbon-carbon bonds and are advantageous for protecting carbon-carbon bonds, thereby improving the stability of the second type regulating particles 1012b and / or the first type regulating particles 1012a.

[0089] In some embodiments, the refractive index difference between the substrate 1011 and the regulating particles 1012 is greater than or equal to 0.02, such as 0.03, 0.05, 0.09, 0.1, 0.15, 0.2, etc., so that the regulating particles 1012 can improve the rainbow pattern problem of the optical film 101 and at the same time realize the function of light diffusion to further improve the optical performance of the optical film 101. Preferably, the refractive index difference between the substrate 1011 and the regulating particles 1012 is greater than or equal to 0.1, such as 0.12, 0.13, 0.14, 0.15, 0.2, etc.

[0090] In some embodiments, the glass transition temperature of the substrate 1011 may be between 70°C and 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. In some embodiments, the elastic modulus of the substrate 1011 is 500 MPa to 5000 MPa at 23° C., and may be, 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.

[0091] In some embodiments, the elastic modulus of the substrate 1011 is obtainable at a humidity of 50%. In some embodiments, the substrate 1011 is selected from at least one of modified or unmodified polyester, modified or unmodified cellulose acetate. In some examples, 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. The modified or unmodified cellulose acetate may include modified or unmodified cellulose triacetate.

[0092] In some embodiments, the substrate 1011 may include a first sub-substrate and a second sub-substrate, and the first sub-substrate may be selected from at least one of an unmodified polyester and an unmodified cellulose acetate. The second sub-substrate may be selected from at least one of a modified polyester and a modified cellulose acetate. In the substrate 1011, a mass fraction of the first sub-substrate is greater than a mass fraction of the second sub-substrate.

[0093] In some embodiments, the first sub-substrate and the second sub-substrate are uniformly mixed with each other, and the mass fraction of the first sub-substrate in the substrate 1011 is 65% or more, such as 70%, 75%, 80%, 85%, 90%, 95%, 99%, etc. The mass fraction of the second sub-substrate in the substrate 1011 is 35% or less, such as 1%, 5%, 10%, 15%, 20%, 25%, 30%, etc. It is advantageous for the good mutual solubility of the modified polyester polyethylene terephthalate and the unmodified polyester polyethylene terephthalate, or the good mutual solubility of the modified cellulose acetate and the unmodified cellulose acetate cellulose triacetate, which is helpful in improving the mechanical properties, flatness, and crystallinity of the substrate 1011 and improving the dispersion of the regulating particles 1012, thereby improving the optical performance of the optical film 101.

[0094] In some embodiments, modified cellulose triacetate, modified polyethylene terephthalate, modified polycarbonate, modified polymethacrylate, or modified polyethylene naphthalate can be obtained by modifying unmodified cellulose triacetate, unmodified polyethylene terephthalate, unmodified polycarbonate, unmodified polymethacrylate, or unmodified polyethylene naphthalate to make them hydrophilic or oleophilic, respectively. For example, modified polyethylene terephthalate can be obtained by introducing a linear alkyl side chain, a carboxyl side chain, a hydroxyl side chain, or a fluorine-containing side chain into unmodified polyethylene terephthalate. When modified polyethylene terephthalate is unmodified polyethylene terephthalate into which a carboxyl side chain and / or a hydroxyl side chain has been introduced, modified polyethylene terephthalate can be obtained by introducing a phenyl group of unmodified polyethylene terephthalate. TIFF2025054187000002.tif1122, TIFF2025054187000003.tif1127 group may be introduced, where n and m are both integers of 0 or more and 10 or less.

[0095] In some embodiments, when the first sub-substrate is selected from unmodified polyethylene terephthalate, when the second sub-substrate is selected from modified polyethylene terephthalate, it is advantageous for the good mutual solubility of modified polyethylene terephthalate and unmodified polyethylene terephthalate, which helps to improve the mechanical properties, flatness, and crystallinity of the substrate 1011 and improve the dispersion of the regulating particles 1012, thereby improving the optical performance of the optical film 101.

[0096] In some embodiments, the thickness of the optical film 101 is 5 microns or more, and the thickness of the optical film 101 is 500 microns or less, such as 10 microns, 50 microns, 60 microns, 100 microns, 150 microns, 200 microns, 250 microns, 300 microns, 350 microns, 400 microns, 450 microns, etc., which facilitates processing of the optical film 101 and helps maintain suitable light transmittance of the optical film 101. Preferably, the thickness of the optical film 101 is 15 microns or more, and the thickness of the optical film 101 is 150 microns or less, such as 20 microns, 25 microns, 30 microns, 40 microns, 50 microns, 60 microns, 80 microns, 100 microns, 120 microns, 130 microns, 140 microns, etc.

[0097] The optical film 101 provided in the embodiment of the present invention improves the product stability of the optical film 101 by controlling the particle size distribution range of the regulating particles 1012 added to the substrate 1011 of the optical film 101 so that the particle size values ​​of the majority of the regulating particles 1012 are close to the median particle size value, thereby improving the stability of the product quality of the display device including the optical film 101.

[0098] 3 to 6, an embodiment of the present invention further provides a polarizer 100 including the optical film 101 described above. The polarizer 100 further includes a polarizing layer 102 disposed on one side of the optical film 101 . Referring to FIGS. 3 to 6, in some embodiments, the polarizer 100 further includes a second optically functional layer 103 located on at least one side of the substrate 1011 . Here, the second optical functional layer 103 is located between the polarizing layer 102 and the optical film 101, or the second optical functional layer 103 is located on the side of the optical film 101 away from the polarizing layer 102.

[0099] In some embodiments, the second optically functional layer 103 is located on the side of the optical film 101 away from the polarizing layer 102, and the polarizer 100 further includes a first adhesive layer 104 arranged on the optical film 101 adjacent to the polarizing layer 102. Here, the first adhesive layer 104 is in direct contact with the polarizing layer 102, or 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.

[0100] In some embodiments, the first adhesive layer 104 is in direct contact with the optical film 101, the first adhesive layer 104 is in direct contact with the polarizing layer 102, or the first adhesive layer 104 is in direct contact with the optical film 101 and the first adhesive layer 104 is in direct contact with the protective layer 105. In some embodiments, the first adhesive layer 104 may be selected from at least one of a water-based adhesive, a pressure-sensitive adhesive, and a UV adhesive, where the water-based adhesive material may be selected from polyvinyl alcohol, the pressure-sensitive adhesive material may be selected from an acrylate copolymer, and the UV adhesive material may be selected from a multifunctional acrylate monomer.

[0101] 3 to 5, in some embodiments, the second optical functional layer 103 includes at least one of a transparent hardening sub-layer 107, a low-reflection sub-layer 108, an anti-reflection sub-layer, an anti-fingerprint sub-layer, and an anti-static sub-layer. When the second optical functional layer 103 is a low-reflection sub-layer 108, the low-reflection sub-layer 108 may be formed by stacking a transparent hardening sub-portion 108a and a low refractive index sub-portion 108b. In some embodiments, the polarizing layer 102 is composed of polyvinyl alcohol and a dye.

[0102] In some embodiments, the polarizer 100 further includes a release layer 109 located on the side of the polarizing layer 102 away from the optical film 101, and the release layer 109 and the polarizing layer 102 are bonded via a second adhesive layer 110. When the polarizer 100 is used in the display device, the release layer 109 is removed to expose the second adhesive layer 110, and the polarizer 100 is attached to a display panel via the second adhesive layer 110. In some embodiments, the polarizer 100 further includes a compensation layer 111 located between the second adhesive layer 110 and the polarizing layer 102 .

[0103] In an embodiment of the present invention, by arranging the optical film 101, optical defects such as moire and white spots caused by the polarizer 100 can be avoided, while at the same time improving the chromaticity, viewing angle, and contrast of a display device using the polarizer 100.

[0104] Referring to FIG. 7, an embodiment of the present invention further provides a display device 10 including the polarizer 100 described above. Specifically, the display device includes a display panel 200 and a first polarizer 300, the first polarizer 300 is disposed on the light-emitting side of the display panel 200, and the first polarizer 300 is selected from the polarizers 100 described above.

[0105] In some embodiments, the display panel 200 may be a liquid crystal display panel, a self-luminous display panel, etc., and the self-luminous display panel may be an OLED (Organic Light-Emitting Diode) display panel, etc. In some embodiments, the optical film 101 of the first polarizer 300 is disposed on the side of the polarizing layer 102 of the first polarizer 300 that is away from the display panel.

[0106] When the display panel 200 is a liquid crystal display panel, the display device 10 further includes a backlight module 400 disposed on a side of the display panel 200 away from the first polarizer 300, the backlight module 400 being used to provide a light source for the display panel 200, and the display device 10 further includes a second polarizer 500 located between the backlight module 400 and the display panel 200. The second polarizer 500 may be selected from the polarizers 100 described above, or the second polarizer 500 may not be selected from the polarizers 100 described above.

[0107] The present invention will now be described in more detail with reference to some examples. However, it should be noted that these examples are provided for illustrative purposes only and should not be construed as limiting the present invention in any way.

[0108] Example 1 In this embodiment, the substrate material is unmodified polyethylene terephthalate, and the regulating particles in the substrate are needle-shaped calcium carbonate whiskers with reduced diameters at both ends. The substrate and the regulating particles are mixed and stretched in the MD (moving direction) and TD (transfer direction) directions (stretching ratio is MD×TD=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 0.05%, and the median particle size of the regulating particles is 18 microns, where the volume fractions of the regulating particles with particle sizes of 0-10um, 10-18um, 18-25um, and 25um or more are 10%, 40%, 40%, and 10%, respectively.

[0109] Example 2 This example is similar to Example 1, except that the mass fraction of the regulating particles in the formed optical film 2 is 0.5%.

[0110] Example 3 This example is similar to Example 1, except that the mass fraction of the regulating particles in the formed optical film 3 is 1%.

[0111] Example 4 This example is similar to Example 1, except that the mass fraction of the regulating particles in the formed optical film 4 is 3%.

[0112] Example 5 This embodiment is similar to Example 1 except that the median particle size of the regulating particles in the formed optical film 5 is 18 microns, the regulating particles in the optical film 5 are obtained by sieving the same regulating particles as in Example 1 through a 625 mesh sieve, and the volume fractions of regulating particles with particle sizes of 0-10 um, 10-18 um, 18-20 um, and 20 um or more are 16%, 42%, 35%, and 7%, respectively.

[0113] Example 6 This example is similar to Example 5, except that the mass fraction of the regulating particles in the formed optical film 6 is 0.5%.

[0114] Example 7 This example is similar to Example 5, except that the mass fraction of the regulating particles in the formed optical film 7 is 1%.

[0115] Example 8 This example is similar to Example 5, except that the mass fraction of the regulating particles in the formed optical film 8 is 3%.

[0116] Example 9 This embodiment is similar to Example 1 except that the median particle size of the regulating particles in the formed optical film 9 is 18 microns, the regulating particles in the optical film 9 are obtained by sieving the same regulating particles as in Example 5 through a 1000 mesh sieve, and the volume fractions of regulating particles with particle sizes of 0 to 13 um, 13 to 18 um, 18 to 20 um, and 20 um or more are 10%, 44%, 36%, and 10%, respectively.

[0117] Example 10 This example is similar to Example 9, except that the mass fraction of the regulating particles in the formed optical film 10 is 0.5%.

[0118] Example 11 This example is similar to Example 9, except that the mass fraction of the regulating particles in the formed optical film 11 is 1%.

[0119] Example 12 This example is similar to Example 9, except that the mass fraction of the control particles in the formed optical film 12 is 3%.

[0120] Example 13 This embodiment is the same as Example 1, except that the regulating particles in the optical film 13 are polystyrene spherical particles, the median particle size of the regulating particles is 2 microns, the volume fractions of regulating particles with particle sizes of 0-1 um, 1-2 um, 2-3 um, and 3-40 um are 20%, 35%, 35%, and 10%, respectively, and the mass fraction of the regulating particles in the optical film 13 is 0.001%.

[0121] Example 14 This example is similar to Example 13, except that the mass fraction of the regulating particles in the optical film 14 is 0.005%.

[0122] Example 15 This example is similar to Example 13, except that the mass fraction of the regulating particles in the optical film 15 is 0.05%.

[0123] Example 16 This example is similar to Example 13, except that the mass fraction of the regulating particles in the optical film 16 is 0.5%.

[0124] Example 17 This example is similar to Example 13, except that the mass fraction of the regulating particles in optical film 17 is 1%.

[0125] Example 18 This example is similar to Example 13, except that the mass fraction of the regulating particles in optical film 18 is 3%.

[0126] Example 19 This embodiment is similar to Example 15, except that the median particle size of the regulating particles in optical film 19 is 2 microns, and the volume fractions of regulating particles with particle sizes of 0-1 um, 1-2 um, 2-3 um, and 3-40 um are 5%, 45%, 45%, and 5%, respectively.

[0127] Example 20 This example is similar to Example 19, except that the mass fraction of the regulating particles in the optical film 20 is 0.5%.

[0128] Example 21 This example is similar to Example 19, except that the mass fraction of the regulating particles in the optical film 21 is 1%.

[0129] Example 22 This example is similar to Example 19, except that the mass fraction of the regulating particles in the optical film 22 is 3%.

[0130] Example 23 This embodiment is similar to Example 1, except that the regulating particles in the optical film 23 consist of calcium carbonate whiskers and spherical polystyrene mixed in a mass ratio of 50:50, in which the median particle size of the calcium carbonate whiskers is 15 microns, the volume fractions of calcium carbonate whiskers with particle sizes of 5-10 um, 10-15 um, 15-20 um and 20-25 um are 20%, 30%, 30% and 20%, respectively, the median particle size of the spherical polystyrene is 2 microns, and the particle size range is greater than 0 microns and less than 5 microns.

[0131] Example 24 This example is similar to Example 23, except that the mass fraction of the control particles in the formed optical film 24 is 0.5%.

[0132] Example 25 This example is similar to Example 23, except that the mass fraction of the control particles in the formed optical film 25 is 1%.

[0133] Example 26 This example is similar to Example 23, except that the mass fraction of the control particles in the formed optical film 26 is 3%.

[0134] Comparative Example 1 This comparative example is similar to Example 1, except that no conditioning particles are included to form Comparative Optical Film 1.

[0135] The optical films obtained in Examples 1 to 26 and the comparative optical film obtained in Comparative Example 1 were placed on the side of a polarizer away from the display panel, and the polarizer was attached to the surface of a 75-inch liquid crystal display panel to observe the rainbow pattern from the front and side, and the optical effect was further tested, and the results are shown in Table 1. The tested polarizer includes a compensation layer, a polarizing layer, a protective layer, an optical film (or a comparative optical film), and a transparent cured sub-layer, which are laminated in order.

[0136] The in-plane retardation values ​​of the optical films obtained in Examples 1 to 26 and the comparative optical film obtained in Comparative Example 1 were measured using Shintech's Optipro-micro retardation measurement device. The results are shown in Table 1.

[0137] The light diffusion films obtained in Examples 1 to 26 and the comparative optical film obtained in Comparative Example 1 were placed on the side of a polarizer away from the display panel, and the polarizer was attached to the surface of a 75-inch liquid crystal display panel, and the rainbow pattern was observed from the front and side, and the results are shown in Table 1. Here, the observation results of "clear", "relatively clear", and "slight" mean that the degree to which the rainbow pattern was observed decreases in order, and "none" means that the rainbow pattern phenomenon was not observed.

[0138] The haze is measured using a haze measuring instrument NDH7000. Contrast is the ratio of the brightness of the white state of a display panel to the brightness of the dark state. This test measures the central luminance of the display panel in the white state and the central luminance of the display panel in the dark state. The transmittance is the ratio of the white state luminance to the emission luminance of the backlight module. The chromaticity viewing angle measurement is based on the CESI standard (CESI0.03). [Table 1]

[0139] From the optical performance results of optical film 1 to optical film 26 and comparative optical film 1 in Table 1, it can be seen that the optical film after adding the control particles to the substrate can effectively improve or eliminate the rainbow phenomenon, and improve the optical performance of the optical film. At the same time, by analyzing the optical performance results such as haze, transmittance, contrast, and seg. viewing angle of optical film 1 to optical film 12 and optical film 13 to optical film 22, it can be seen that the more the particle size of the control particles is concentrated toward the central particle size, the better the overall improvement of the optical performance of the optical film. Finally, from the optical performance results of optical film 23 to optical film 26, it can be seen that when the first type control particles and the second type control particles are simultaneously present in the optical film, the overall improvement effect of the optical performance of the optical film is better than when only the first type control particles or only the second type control particles are present in the optical film.

[0140] The embodiments of the present invention disclose an optical film, a polarizer and a display device, the optical film comprising a substrate and regulating particles dispersed in the substrate, the regulating particles comprising a first type regulating particles and / or a second type regulating particles, the aspect ratio of the first type regulating particles being 1 or more and less than 5, the aspect ratio of the second type regulating particles being 5 or more and 50 or less, the particle size value of 80% or more of the first type regulating particles being within 50%-140% of the range of the first median particle size value, and the particle size value of 80% or more of the second type regulating particles being within 50%-140% of the range of the second median particle size value, the present invention controls the particle size distribution range of the regulating particles so that the particle size value of the majority of the regulating particles is close to the median particle size value, thereby improving the product stability of the optical film and improving the stability of the display device.

[0141] Although the optical film, polarizer and display device provided in the examples of the present invention have been introduced in detail, specific examples are used in this specification to explain the principles and embodiments of the present invention. The above description of the examples is only used to understand the method of the present invention and its core concept. At the same time, those skilled in the art will be able to change the specific embodiments and application scope based on the idea of ​​the present invention. In short, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A substrate; and modulating particles, the modulating particles being dispersed in the substrate; Here, each of the adjustment particles has a particle size value, the particle size values ​​of all the adjustment particles are distributed in a certain range, each of the adjustment particles corresponds to one central particle size value, and the particle size values ​​of 80% or more of the adjustment particles are located within 50% to 140% of the range of the corresponding central particle size value of each of the adjustment particles. An optical film characterized by:

2. Of all the regulating particles, 80% or more of the regulating particles have particle sizes within a range of 70% to 110% of the corresponding median particle size value of each of the regulating particles.

2. The optical film according to claim 1 .

3. The regulatory particles include a first type of regulatory particle and / or a second type of regulatory particle; The first type of regulating particle has a plurality of first cross sections, each of the first cross sections having one first circumscribing circle, the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle having the largest diameter among the plurality of first circumscribing circles is 1 or more, and the ratio of the length of the major axis of the first type of regulating particle to the diameter of the first circumscribing circle having the largest diameter among the plurality of first circumscribing circles is less than 5; The second type of regulating particle has a plurality of second cross sections, each of the second cross sections having one second circumscribing circle, the ratio of the length of the major axis of the second type of regulating particle to the diameter of the second circumscribing circle having the largest diameter among the plurality of second circumscribing circles is 5 or more, and the ratio of the length of the major axis of the second type of regulating particle to the diameter of the second circumscribing circle having the largest diameter among the plurality of second circumscribing circles is 50 or less; Each of the first type of regulating particles has a first particle size value, the first particle size values ​​of all of the first type of regulating particles are distributed in a certain range, all of the first type of regulating particles correspond to one first median particle size value, and among all of the first type of regulating particles, the first particle size values ​​of 80% or more of the first type of regulating particles are located within 50% to 140% of the range of the first median particle size value; Each of the second type regulating particles has a second particle size value, the second particle size values ​​of all of the second type regulating particles are distributed in a certain range, all of the second type regulating particles correspond to one second median particle size value, and among all of the second type regulating particles, the second particle size values ​​of 80% or more of the second type regulating particles are located within 50% to 140% of the range of the second median particle size value.

2. The optical film according to claim 1 .

4. and / or, among all the first type of regulating particles, 80% or more of the first type of regulating particles have a first particle size value that is within 70% to 110% of the range of the first median particle size value; Of all the second type of regulating particles, 80% or more of the second type of regulating particles have a second particle size value that is within a range of 70% to 110% of the second median particle size value. The optical film according to claim 3 .

5. The first type of regulatory particles are selected from at least one of a first subtype of regulatory particles, a second subtype of regulatory particles, a third subtype of regulatory particles, a fourth subtype of regulatory particles, and a fifth subtype of regulatory particles having different shapes, and the second type of regulatory particles are selected from at least one of a sixth subtype of regulatory particles, a seventh subtype of regulatory particles, an eighth subtype of regulatory particles, a ninth subtype of regulatory particles, and a tenth subtype of regulatory particles having different shapes; wherein the change in diameter of the first circumscribing circle of the first cross section of the first subtype regulatory particle along the extension direction of the long axis of the first subtype regulatory particle is 0.3 microns or less; a first end of the second subtype regulatory particle is connected to a second end of the second subtype regulatory particle, and along a direction away from the second end of the second subtype regulatory particle, a diameter of a first circumscribing circle of the first cross-section located at the first end of the second subtype regulatory particle gradually decreases; along a direction away from the first end of the second subtype regulatory particle, a diameter of a first circumscribing circle of the first cross-section located at the second end of the second subtype regulatory particle gradually decreases; Along the extension direction of the long axis of the third subtype regulatory particle, the change in diameter of the first circumscribing circle of the first cross section located at the center of the third subtype regulatory particle is 1 micron or less, and along the direction away from the center of the third subtype regulatory particle, the diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulatory particle gradually decreases, and the change in diameter of the first circumscribing circle of the first cross section located at the second end of the third subtype regulatory particle is 1 micron or less; Along the extension direction of the long axis of the fourth subtype regulatory particle, the change in diameter of the first circumscribing circle of the first cross section located at the center of the fourth subtype regulatory particle is 1 micron or less, and along the direction away from the center of the fourth subtype regulatory particle, the diameter of the first circumscribing circle of the first cross section located at the first end of the fourth subtype regulatory particle gradually decreases, and the diameter of the first circumscribing circle of the first cross section located at the second end of the fourth subtype regulatory particle gradually decreases; a first end of the fifth subtype regulatory particle is connected to a second end of the fifth subtype regulatory particle, and a diameter of a first circumscribing circle of the first cross section of the fifth subtype regulatory particle gradually decreases along a direction from the first end of the fifth subtype regulatory particle to the second end of the fifth subtype regulatory particle; The change in diameter of the second circumscribing circle of the second cross section of the sixth subtype regulatory particle along the extension direction of the long axis of the sixth subtype regulatory particle is 0.3 microns or less; Along the extension direction of the long axis of the seventh subtype regulatory particle, the change in diameter of the second circumscribing circle of the second cross section located at the center of the seventh subtype regulatory particle is 1 micron or less, and along the direction away from the center of the seventh subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the seventh subtype regulatory particle gradually decreases, and the change in diameter of the second circumscribing circle of the second cross section located at the second end of the seventh subtype regulatory particle is 1 micron or less; Along the extension direction of the long axis of the eighth subtype regulatory particle, the change in diameter of the second circumscribing circle of the second cross section located at the center of the eighth subtype regulatory particle is 1 micron or less, and along the direction away from the center of the eighth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the eighth subtype regulatory particle gradually decreases, and the diameter of the second circumscribing circle of the second cross section located at the second end of the eighth subtype regulatory particle gradually decreases; a first end of the ninth subtype regulatory particle is connected to a second end of the ninth subtype regulatory particle, and a diameter of a second circumscribing circle of the second cross section of the ninth subtype regulatory particle gradually decreases along a direction from the first end of the ninth subtype regulatory particle to the second end of the ninth subtype regulatory particle; The first end of the tenth subtype regulatory particle is connected to the second end of the tenth subtype regulatory particle, and along a direction away from the second end of the tenth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the tenth subtype regulatory particle gradually decreases, and along a direction away from the first end of the tenth subtype regulatory particle, the diameter of the second circumscribing circle of the second cross section located at the second end of the tenth subtype regulatory particle gradually decreases. The optical film according to claim 3 .

6. The first subtype of regulating particles is selected from cubic particles or rectangular particles, the second subtype of regulating particles is selected from spherical particles or ellipsoid particles, the third subtype of regulating particles is selected from needle-shaped particles with a reduced diameter at one end, the fourth subtype of regulating particles is selected from needle-shaped particles with a reduced diameter at both ends, the fifth subtype of regulating particles is selected from pyramidal particles, the sixth subtype of regulating particles is selected from rod-shaped particles, the seventh subtype of regulating particles is selected from needle-shaped particles with a reduced diameter at one end, the eighth subtype of regulating particles is selected from needle-shaped particles with a reduced diameter at both ends, the ninth subtype of regulating particles is selected from pyramidal particles, and the tenth subtype of regulating particles is selected from bipyramidal particles or ellipsoidal particles.

6. The optical film according to claim 5.

7. The first type of regulatory particle includes the first subtype of regulatory particle and / or the second subtype of regulatory particle.

6. The optical film according to claim 5.

8. The mass fraction of the regulating particles in the optical film is 20% or less.

2. The optical film according to claim 1 .

9. The optical film according to any one of claims 1 to 8 is included. A polarizer characterized by:

10. The polarizer according to claim 9 A display device comprising:

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