Optical film, polarizing plate, and display device

Abstract

To provide an optical film which can alleviate a conventional technical issue in which a rainbow pattern resulting from the optical film lowers the display quality of a display device, to provide a polarizing plate, and to provide a display device.SOLUTION: An optical film 101, a polarizing plate and a display device are disclosed. The optical film 101 includes a base material 1011, and adjustment particles 1012 dispersed in the base material 1011. The optical film 101 includes an in-plane phase difference value, and the in-plane phase difference value of the optical film 101 is below 3000 nanometers. By inputting the adjustment particles into the base material of the optical film, the in-plane phase difference value of the optical film is reduced to below 3000 nanometers, a difference between the in-plane phase difference value and a thickness direction phase difference value of the optical film is made to be small, and the problem of a rainbow pattern by the optical film is improved.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the display field, and specifically to an optical film, a polarizing plate and a display device. [Background technology]

[0002] At present, a polarizing plate generally includes a polarizing layer, and an optical film is used as a protective layer for the polarizing layer, which functions to protect the polarizing layer. However, since the optical film used as the protective layer has properties such as birefringence, when the polarizing plate is applied to a display device, a rainbow pattern appears when the display device is viewed from an oblique direction, which causes a problem of degraded display quality of the display device.

[0003] Therefore, there is a demand for optical films, polarizing plates and display devices that can solve the above problems. Summary of the Invention [Problem to be solved by the invention]

[0004] Provided are an optical film, a polarizing plate, and a display device that can alleviate the conventional technical problem that rainbow patterns caused by optical films deteriorate the display quality of display devices. [Means for solving the problem]

[0005] The optical film provided by the present invention includes a substrate and controlled particles dispersed within the substrate, and the optical film has an in-plane retardation value, and the in-plane retardation value of the optical film is less than 3000 nanometers.

[0006] Preferably, the optical film has an in-plane retardation value of 1000 nanometers or less.

[0007] Preferably, the optical film has an in-plane retardation value of 500 nanometers or less.

[0008] Preferably, the optical film has an in-plane retardation value of 200 nanometers or less.

[0009] Preferably, the optical film has a thickness direction retardation value, and the ratio of the in-plane retardation value of the optical film to the thickness direction retardation value of the optical film is greater than 0.1, and the ratio of the in-plane retardation value of the optical film to the thickness direction retardation value of the optical film is less than 2.

[0010] Preferably, the adjusting particles include first type adjusting particles and / or second type adjusting particles, the first type adjusting particles have a plurality of first cross sections, each of the first cross sections having one first circumscribing circle, the ratio of the long axis length of the first type adjusting particle to the first circumscribing circle having the largest diameter among the plurality of first circumscribing circles is 1 or more, the ratio of the long axis length of the first type adjusting 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 adjusting particles have a plurality of second cross sections, each of the second cross sections having one second circumscribing circle, the ratio of the long axis length of the second type adjusting 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 long axis length of the second type adjusting particle to the second circumscribing circle having the largest diameter among the plurality of second circumscribing circles is 50 or less.

[0011] Preferably, the first type controlled particles are at least one selected from the first subtype controlled particles and the second subtype controlled particles, which have different shapes from each other, the second type controlled particles are at least one selected from the sixth subtype controlled particles, the seventh subtype controlled particles, the eighth subtype controlled particles, the ninth subtype controlled particles, and the tenth subtype controlled particles, which have different shapes from each other, the first type controlled particles are at least one selected from the first subtype controlled particles, the second subtype controlled particles, the third subtype controlled particles, the fourth subtype controlled particles, and the fifth subtype controlled particles, which have different shapes from each other, the second type controlled particles are at least one selected from the sixth subtype controlled particles, the seventh subtype controlled particles, the eighth subtype controlled particles, the ninth subtype controlled particles, and the tenth subtype controlled particles, which have different shapes from each other, and the change in diameter of the first circumscribing circle of the first cross section of the first subtype controlled particles along the extension direction of the major axis of the first subtype controlled particles is 0.a first end of the second subtype adjusting particle is connected to a second end of the second subtype adjusting particle, a diameter of a first circumscribing circle of the first cross section located at the first end of the second subtype adjusting particle decreases along a direction away from the second end of the second subtype adjusting particle, a diameter of a first circumscribing circle of the first cross section located at the second end of the second subtype adjusting particle decreases along a direction away from the first end of the second subtype adjusting particle, a change in diameter of the first circumscribing circle of the first cross section located at a middle part of the third subtype adjusting particle along an extension direction of a major axis of the third subtype adjusting particle is 1 micrometer or less, a diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype adjusting particle decreases along a direction away from the middle part of the third subtype adjusting particle, a change in diameter of the first circumscribing circle of the first cross section located at the second end of the third subtype adjusting particle decreases a diameter change value is 1 micrometer or less, a change value of the diameter of the first circumscribing circle of the first cross section located at the middle part of the fourth subtype adjustment particle is 1 micrometer or less along the extension direction of the long axis of the fourth subtype adjustment particle, a diameter of the first circumscribing circle of the first cross section located at the first end of the fourth subtype adjustment particle decreases along a direction away from the middle part of the fourth subtype adjustment particle, a diameter of the first circumscribing circle of the first cross section located at the second end of the fourth subtype adjustment particle decreases, a first end of the fifth subtype adjustment particle is connected to a second end of the fifth subtype adjustment particle, a diameter of the first circumscribing circle of the first cross section of the fifth subtype adjustment particle decreases along a direction from the first end of the fifth subtype adjustment particle to the second end of the fifth subtype adjustment particle, and a change value of the diameter of the second circumscribing circle of the second cross section of the sixth subtype adjustment particle is 0.a change in diameter of the second circumscribing circle of the second cross section located at a middle part of the seventh subtype adjustment particle along the extension direction of the long axis of the seventh subtype adjustment particle is 1 micrometer or less, a change in diameter of the second circumscribing circle of the second cross section located at a first end of the seventh subtype adjustment particle along a direction away from the middle part of the seventh subtype adjustment particle is smaller, a change in diameter of the second circumscribing circle of the second cross section located at the second end of the seventh subtype adjustment particle is 1 micrometer or less, a change in diameter of the second circumscribing circle of the second cross section located at a middle part of the eighth subtype adjustment particle along the extension direction of the long axis of the eighth subtype adjustment particle is 1 micrometer or less, and a change in diameter of the second circumscribing circle of the second cross section located at a first end of the eighth subtype adjustment particle along a direction away from the middle part of the eighth subtype adjustment particle is smaller. the diameter of the second circumscribing circle of the second cross section located at the second end of the 8 subtype adjusting particle becomes smaller; the first end of the 9 subtype adjusting particle is connected to the second end of the 9 subtype adjusting particle, and the diameter of the second circumscribing circle of the second cross section of the 9 subtype adjusting particle becomes smaller along the direction from the first end of the 9 subtype adjusting particle to the second end of the 9 subtype adjusting particle; the first end of the 10 subtype adjusting particle is connected to the second end of the 10 subtype adjusting particle, and the diameter of the second circumscribing circle of the second cross section located at the first end of the 10 subtype adjusting particle becomes smaller along the direction away from the second end of the 10 subtype adjusting particle; and the diameter of the second circumscribing circle of the second cross section located at the second end of the 10 subtype adjusting particle becomes smaller along the direction away from the first end of the 10 subtype adjusting particle.

[0012] Preferably, the regulating particles include the first type regulating particles and the second type regulating particles, the mass fraction of the first type regulating particles being greater than 50% and the mass fraction of the second type regulating particles being less than 50%.

[0013] Preferably, the substrate includes a first sub-substrate and / or a second sub-substrate, the first sub-substrate being at least one selected from unmodified polyester and unmodified acetate fiber, the second sub-substrate being at least one selected from modified polyester and modified acetate cellulose, the mass fraction of the first sub-substrate in the substrate being 65% or more, the mass fraction of the first sub-substrate in the substrate being 100% or less, the mass fraction of the second sub-substrate in the substrate being 0% or more, and the mass fraction of the second sub-substrate in the substrate being 35% or less.

[0014] The present invention further provides a polarizing plate, which comprises the optical film.

[0015] The present invention further provides a display device, which includes the polarizing plate. Effect of the Invention

[0016] By incorporating the control particles into the substrate of the optical film, the difference between the in-plane retardation value and the thickness direction retardation value of the optical film is reduced, and the problem of rainbow patterns caused by the optical film is improved. [Brief description of the drawings]

[0017] In order to more clearly describe the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without any creative efforts.

[0018] [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. 3 is a third structural schematic diagram of the optical film provided in the embodiment of the present invention. [Figure 4]FIG. 2 is a first structural schematic diagram of a polarizing plate provided in an embodiment of the present invention; [Diagram 5] FIG. 2 is a second structural schematic diagram of a polarizing plate provided in an embodiment of the present invention. [Figure 6] FIG. 3 is a third structural schematic diagram of a polarizing plate provided in an embodiment of the present invention. [Figure 7] FIG. 4 is a fourth structural schematic diagram of a polarizing plate provided in an embodiment of the present invention. [Figure 8] 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

[0019] Hereinafter, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention, and obviously, the described embodiments are only some of the embodiments of the present invention, and are not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative labor also belong to the protection scope of the present invention. In addition, it should be understood that the specific embodiments described herein are for explaining and interpreting the present invention, and do not limit the present invention. In the present invention, unless otherwise described, the directional terms "up" and "down" used generally refer to the up and down of the device in the actual use or operation state, specifically the drawing direction in the drawing, and "inside" and "outside" refer to the contour of the device.

[0020] Currently, because the optical film of the protective layer of the polarizing layer has properties such as birefringence, when a polarizing plate is applied to a display device, there is a technical problem in that a rainbow pattern is seen when the display device is viewed from an oblique direction, thereby degrading the display quality of the display device.

[0021] Referring to Figures 1 to 3, an optical film 101 provided in an embodiment of the present invention includes a substrate 1011 and adjustment particles 1012 dispersed in the substrate, and 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.

[0022] In an embodiment of the present invention, the adjustment particles 1012 are put into the substrate 1011 of the optical film 101, thereby reducing the in-plane retardation value of the optical film to less than 3000 nanometers, reducing the difference between the in-plane retardation value and the thickness direction retardation value of the optical film 101, and improving the problem of rainbow patterns caused by the optical film.

[0023] The technical solution of the present invention will now be described with reference to specific embodiments.

[0024] In this embodiment, 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 located, and the plane in which the optical film 101 is located 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 a light ray passes through the optical film 101, a difference between an in-plane retardation value and a thickness direction retardation value of the optical film 101 is formed due to a difference between a refractive index of the light ray in a plane where the optical film 101 is located and a refractive index of the light ray in the thickness direction of the optical film 101. When the in-plane retardation value of the optical film 101 is 3000 nanometers or more, the difference between the in-plane retardation value and the thickness direction retardation value of the optical film 101 is too large, and when the light ray passes through the optical film 101, a rainbow phenomenon exists when the light ray is observed at a large angle (for example, the angle between the optical film 101 and the thickness direction is 45 degrees, 60 degrees, etc.). By adding the adjusting particles 1012, the difference between the refractive index of the light in the plane where the optical film 101 is located and the 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 large angle directions of the optical film 101 and improving the display quality of the display device using the optical film 101.

[0025] In some embodiments, the in-plane retardation value of the optical film 101 can be calculated by the following formula: JPEG2025054174000002.jpg644, where 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 .

[0026] In some embodiments, the in-plane retardation value of the optical film 101 can be obtained by measuring the difference between the extraordinary refractive index and the ordinary refractive index of the optical film 101 under a continuous spectrum white light source using a phase retardation measuring instrument (e.g., Shintech's Optipo-micro), thereby obtaining the in-plane retardation value of the optical film 101 according to the above formula.

[0027] In some embodiments, the retardation amount in the thickness direction of the optical film 101 is determined by the anisotropy values ​​of two sets of refractive indexes of the optical film 101 observed on a cross section perpendicular to the plane on which the optical film 101 is located. JPEG2025054174000003.jpg646, JPEG2025054174000004.jpg646 and the thickness of the optical film 101, n z is the refractive index in the thickness direction of the optical film 101. In some embodiments, the in-plane retardation value of the optical film 101 is 0 nanometers or more, and the in-plane retardation value of the optical film 101 is 1000 nanometers or less, which contributes to further reducing the difference between the in-plane retardation value of the optical film 101 and the in-plane 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., thereby effectively improving the rainbow pattern problem in a large angle direction of the optical film 101, and improving the display quality of the display device having the optical film 101. Preferably, the in-plane retardation value of the optical film 101 is equal to or greater than 0 nm, and the in-plane retardation value of the film 101 is equal to or less than 500 nm, further effectively improving the rainbow pattern problem in a large angle direction of the optical film 101, and improving the display quality of the display device having the optical film 101. More preferably, the in-plane retardation value of the optical film 101 is 0 nanometers or more, and the in-plane retardation value of the optical film 101 is 200 nanometers or less. The range of the in-plane retardation value of the optical film 101 is closest to the range of the in-plane retardation value in the thickness direction of the optical film 101, thereby most effectively improving the problem of rainbow patterns in large angle directions of the optical film 101 and improving the display quality of a display device having the optical film 101.

[0028] In some embodiments, the closer the ratio of the in-plane retardation value of the optical film 101 to the thickness direction retardation value of the optical film 101 is to 1, and the smaller the difference between the refractive index of the light in the plane where the optical film 101 is located and the refractive index of the light in the thickness direction of the optical film 101 is, the more the problem of rainbow patterns can be solved. The ratio of the in-plane retardation value of the optical film 101 to the thickness direction retardation value 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 thickness direction retardation value 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., that is, the problem of rainbow patterns can be effectively improved. Preferably, the ratio of the in-plane retardation value of the optical film 101 to the thickness direction retardation value 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 thickness direction retardation value of the optical film 101 is 1.5 or less, that is, the occurrence of the rainbow pattern problem can be basically avoided. More preferably, the ratio of the in-plane retardation value of the optical film 101 to the thickness direction retardation value 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 thickness direction retardation value of the optical film 101 is 1.2 or less, and the rainbow pattern problem can be completely solved.

[0029] In some embodiments, the substrate 1011 is at least one selected from the following: modified or unmodified polyester, modified or unmodified acetate cellulose.

[0030] In some embodiments, the modified or unmodified polyester may include at least one of modified or unmodified polyethylene terephthalate, modified or unmodified polycarbonate, modified or unmodified polymethyl methacrylate, modified or unmodified polyethylene naphthalate. The modified or unmodified acetate cellulose may include modified or unmodified triacetate cellulose.

[0031] In some embodiments, the substrate 1011 may include a first sub-substrate and / or a second sub-substrate, the first sub-substrate being at least one selected from unmodified polyester and unmodified acetate cellulose, and the second sub-substrate being at least one selected from modified polyester and modified acetate cellulose. In the substrate 1011, the mass fraction of the first sub-substrate is greater than the mass fraction of the second sub-substrate.

[0032] 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, for example, 70%, 75%, 80%, 85%, 90%, 95%, 99%, etc. The mass fraction of the second sub-substrate in the substrate 1011 is 35% or more, for example, 1%, 5%, 10%, 15%, 20%, 25%, 30%, etc. The mutual solubility of the polyester, which is advantageous for modification such as polyethylene terephthalate, and the unmodified polyester, such as polyethylene terephthalate, is good, or the mutual solubility of the unmodified acetate cellulose, such as triacetate cellulose, and the unmodified acetate cellulose, such as triacetate cellulose, is good, which improves the mechanical properties, flatness, and crystallinity of the substrate 1011 and improves the dispersibility of the adjustment particles 1012, thereby contributing to improving the optical performance of the optical film 101.

[0033] In some embodiments, modified triacetate cellulose, modified polyethylene terephthalate, modified polycarbonate, modified polymethacrylate, or modified polyethylene naphthalate can be obtained by hydrophilically or lipophilically modifying unmodified triacetate fiber, unmodified polyethylene terephthalate, unmodified polycarbonate, unmodified polymethacrylate, or unmodified polyethylene naphthalate, respectively. For example, modified polyethylene terephthalate can be obtained by introducing a linear alkyl side chain, a carboxyl side chain, a hydroxyl side chain, or a fluorine-containing group side chain into unmodified polyethylene terephthalate. When modified polyethylene terephthalate is obtained by introducing a carboxyl side chain and / or a hydroxyl side chain into unmodified polyethylene terephthalate, modified polyethylene terephthalate is obtained by introducing a carboxyl side chain and / or a hydroxyl side chain into the phenyl group of unmodified polyethylene terephthalate. JPEG2025054174000005.jpg1021, JPEG2025054174000006.jpg1026 groups can be introduced, where n and m are both integers between 0 and 10.

[0034] In some embodiments, when the first sub-substrate is selected from unmodified polyethylene terephthalate, the second sub-substrate is selected from modified polyethylene terephthalate, and the mutual solubility between polyethylene terephthalate and unmodified polyethylene terephthalate, which is advantageous for modification, is good, and the mechanical properties, flatness, and crystallinity of the substrate 1011 are improved, and the dispersibility of the adjustment particles 1012 is improved, thereby contributing to improving the optical performance of the optical film 101.

[0035] In some embodiments, the adjustment particle 1012 has a major axis and a diameter, the major axis length of the adjustment particle 1012 is the distance between the two end points of the major axis of the adjustment particle 1012, each of the adjustment particles 1012 includes multiple cross sections in the extension direction perpendicular to the major axis of the adjustment particle, each cross section includes one circumscribing circle, and the diameter of the adjustment particle 1012 corresponds to the diameter of the circumscribing circle with the largest diameter among the multiple cross sections. Here, the two points that are the furthest apart in one cross section of the adjustment particle 1012 are located on the circumscribing circle of the cross section, and the distance between the two points that are the furthest apart in the cross section is the diameter of the circumscribing circle. The adjustment particle 1012 includes a first type adjustment particle 1012a.

[0036] Here, the first type regulated particle 1012a includes a plurality of first cross sections, each of the first cross sections includes one first circumscribing circle, the ratio of the long axis length of the first type regulated 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, the ratio of the long axis length of the first type regulated 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, 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 long axis of the second type regulated particle 1012b. The adjustment particles 1012 include the first type adjustment particles 1012a having a relatively small aspect ratio (the ratio of the major axis length to the diameter of the first circumscribing circle having the largest diameter), which effectively contributes to reducing the in-plane retardation value of the optical film 101 to 3,000 nanometers or less, and effectively contributes to reducing the difference between the in-plane retardation value of the optical film 101 and the thickness direction retardation value of the optical film 101, thereby improving the problem of rainbow patterns in the optical film 101 and improving the display quality of a display device having the optical film 101.

[0037] In some embodiments, the first type regulated particle 1012a is at least one selected from the group consisting of a first subtype regulated particle, a second subtype regulated particle, a third subtype regulated particle, a fourth subtype regulated particle, and a fifth subtype regulated particle, each of which has a different shape from the others.

[0038] Here, the change in diameter of the first circumscribing circle of the first cross section of the first subtype controlling particle along the extension direction of the long axis of the first subtype controlling particle is 0.3 micrometers or less, for example, 0 micrometers, 0.28 micrometers, 0.25 micrometers, 0.22 micrometers, 0.2 micrometers, 0.18 micrometers, 0.15 micrometers, 0.12 micrometers, 0.1 micrometers, 0.08 micrometers, 0.05 micrometers, 0.02 micrometers, etc. In some embodiments, along the extension direction of the long axis of the first subtype controlling particle, the diameter of the first circumscribing circle of the first cross section located at the first end of the first subtype controlling particle is the same as the diameter of the first circumscribing circle of the first cross section located at the middle part of the sixth subtype controlling particle, and the diameter of the first circumscribing circle of the first cross section located at the second end of the first subtype controlling particle is the same as the diameter of the first circumscribing circle of the first cross section located at the middle part of the first subtype controlling particle.

[0039] In some embodiments, the first cross-section of the first subtype conditioning particle may be a regular shape, such as a circle, an oval, a triangle, a square, or an irregular shape.

[0040] In some embodiments, the first subtype controlling particles are cubic particles or rectangular particles, the first cross-section of the first subtype controlling particles is square or rectangular, and the diameter of a first circumscribing circle of the first cross-section of any of the first subtype controlling particles is the diagonal length of the square or rectangle formed by the first cross-section.

[0041] It is more preferable that the ratio of the long axis length of the first subtype controlling particle to the diameter of the first circumscribing circle that has the largest diameter among the first circumscribing circles of the multiple first cross sections of the first subtype controlling 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.

[0042] A first end of the second subtype adjusting particle is connected to a second end of the second subtype adjusting particle, and a diameter of a first circumscribing circle of the first cross section located at the first end of the second subtype adjusting particle becomes smaller along a direction away from the second end of the second subtype adjusting particle, and a diameter of a first circumscribing circle of the first cross section located at the second end of the second subtype adjusting particle becomes smaller along a direction away from the first end of the second subtype adjusting particle.

[0043] As can be understood, this includes, but is not limited to, the diameter of the first circumscribing circle of the first cross section located at the first end of the second subtype regulating particle becomes smaller 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 tends to become smaller along the direction away from the first end of the second subtype regulating particle, and the diameter of the first circumscribing circle of the first cross section located at the first end of the second subtype regulating particle tends to become smaller along the direction away from the second end of the second subtype regulating particle.

[0044] As can be understood, this includes, but is not limited to, the diameter of the first circumscribing circle of the first cross section located at the second end of the second subtype regulating particle becomes smaller 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 tends to become smaller along the direction away from the first end of the second subtype regulating particle, and the diameter of the first circumscribing circle of the first cross section located at the second end of the second subtype regulating particle tends to become smaller along the direction away from the first end of the second subtype regulating particle.

[0045] In some embodiments, the first cross-section of the second subtype conditioning particle may be a regular or irregular shape, such as a circle, an oval, a triangle, a square, etc.

[0046] In some embodiments, when the second subtype control particles are spherical particles and / or ellipsoidal particles, the first cross-section of the second subtype control particles is circular or elliptical. When the first cross-section of the second subtype control particles is elliptical, the ratio of the major axis of the ellipse of any of the first cross-sections of the second subtype control particles to the minor axis of the ellipse is greater than 1 and not greater than 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. When the second subtype control particles are spherical particles, the first cross-section of any of the second subtype control particles is circular, the first circumscribing circle of any of the first cross-sections of the second subtype control particles overlaps with the first cross-section, and the ratio of the major axis length of the second subtype control particle to the diameter of the first circumscribing circle with the largest diameter among the plurality of first cross-sections of the second subtype control particles is 1.

[0047] The ratio of the major axis length of the second subtype control particle to the diameter of the first circumscribing circle having the largest diameter among the plurality of first circumscribing circles of the second subtype control particle is preferably close to 1, and when the second subtype control particle is an ellipsoidal spherical particle, its shape is more preferably close to a spherical particle. That is, the closer the major axis length of the second subtype control particle to the diameter of the second subtype control particle, the better. Preferably, the ratio of the major axis length of the second subtype control particle to the diameter of the first circumscribing circle having the largest diameter among the plurality of first circumscribing circles of the second subtype control particle is 1 or more, and the ratio of the major axis length of the second subtype control particle to the diameter of the first circumscribing circle having the largest diameter among the plurality of first circumscribing circles of the second subtype control particle is 3 or less. More preferably, the ratio of the long axis length of the second subtype control particle to the diameter of the first circumscribing circle having the largest diameter among the multiple first circumscribing circles of the second subtype control particle is 1 or more, and the ratio of the long axis length of the second subtype control particle to the diameter of the first circumscribing circle having the largest diameter among the multiple first circumscribing circles of the second subtype control particle is 1.5 or less.

[0048] The change in diameter of the first circumscribing circle of the first cross section located in the middle of the third subtype control particle along the extension direction of the long axis of the third subtype control particle is 1 micrometer or less, for example, 0 micrometers, 0.95 micrometers, 0.8 micrometers, 0.78 micrometers, 0.75 micrometers, 0.72 micrometers, 0.7 micrometers, 0.68 micrometers, 0.65 micrometers, 0.62 micrometers, 0.6 micrometers, 0.58 micrometers, 0.55 micrometers, 0.52 micrometers, It may be 0.5 micrometers, 0.48 micrometers, 0.45 micrometers, 0.42 micrometers, 0.4 micrometers, 0.38 micrometers, 0.35 micrometers, 0.32 micrometers, 0.3 micrometers, 0.28 micrometers, 0.25 micrometers, 0.22 micrometers, 0.2 micrometers, 0.18 micrometers, 0.15 micrometers, 0.12 micrometers, 0.1 micrometers, 0.08 micrometers, 0.05 micrometers, 0.02 micrometers, and the like.Along a direction away from the middle portion of the third subtype controlling particle, a diameter of a first circumscribing circle of the first cross section located at a first end of the third subtype controlling particle becomes smaller, and a change value of the diameter of the second end of the third subtype controlling particle is 1 micrometer or less, for example, 0 micrometer, 0.95 micrometer, 0.8 micrometer, 0.78 micrometer, 0.75 micrometer, 0.72 micrometer, 0.7 micrometer, 0.68 micrometer, 0.65 micrometer, 0.62 micrometer, 0.6 micrometer, 0.58 micrometer, 0.55 micrometer. The diameter of the third subtype adjusting particle may be 0.52 micrometers, 0.5 micrometers, 0.48 micrometers, 0.45 micrometers, 0.42 micrometers, 0.4 micrometers, 0.38 micrometers, 0.35 micrometers, 0.32 micrometers, 0.3 micrometers, 0.28 micrometers, 0.25 micrometers, 0.22 micrometers, 0.2 micrometers, 0.18 micrometers, 0.15 micrometers, 0.12 micrometers, 0.1 micrometers, 0.08 micrometers, 0.05 micrometers, 0.02 micrometers, etc. In some embodiments, the diameter of a first circumscribing circle of the first cross section located at a first end of the third subtype adjusting particle decreases along a direction away from the intermediate portion of the third subtype adjusting particle, and the diameter of a first circumscribing circle of the first cross section located at a second end of the third subtype adjusting particle is the same as the diameter of a first circumscribing circle of the first cross section located at the intermediate portion of the third subtype adjusting particle.

[0049] As can be understood, the diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulating particle becomes smaller along the direction away from the middle part of the third subtype regulating particle, and the diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulating particle tends to become smaller in the direction away from the middle part of the third subtype regulating particle, including, but not limited to, the diameter of the first circumscribing circle of the first cross section located at the first end of the third subtype regulating particle gradually becomes smaller in the direction away from the middle part of the third subtype regulating particle.

[0050] In some embodiments, the first cross-section of the third subtype conditioning particle may be a regular or irregular shape, such as a circle, an oval, a triangle, a square, or the like.

[0051] In some embodiments, the third subtype controlling particles may be needle-shaped particles having a smaller diameter at one end.

[0052] In some embodiments, when the third subtype controlling particle is a needle-shaped particle with a smaller diameter at one end, the first cross section of the third subtype controlling particle may be circular or elliptical. When the first cross section located at the second end of the third subtype controlling particle or the first cross section located at the middle part of the third subtype controlling particle is elliptical, the ratio of the major axis of the ellipse of the first cross section located at either the second end or the middle part of the third subtype controlling particle to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The shape of the first cross section located at the first end of the third subtype controlling particle is the same as the shape of the first cross section located at the middle part of the third subtype controlling particle, and the area decreases along the direction away from the middle part of the third subtype controlling particle.

[0053] The change in diameter of the first circumscribing circle of the first cross section located in the middle of the fourth subtype control particle along the extension direction of the long axis of the fourth subtype control particle is 1 micrometer or less, for example, 0 micrometers, 0.95 micrometers, 0.8 micrometers, 0.78 micrometers, 0.75 micrometers, 0.72 micrometers, 0.7 micrometers, 0.68 micrometers, 0.65 micrometers, 0.62 micrometers, 0.6 micrometers, 0.58 micrometers, 0.55 micrometers, 0.52 micrometers, It may be 0.5 micrometers, 0.48 micrometers, 0.45 micrometers, 0.42 micrometers, 0.4 micrometers, 0.38 micrometers, 0.35 micrometers, 0.32 micrometers, 0.3 micrometers, 0.28 micrometers, 0.25 micrometers, 0.22 micrometers, 0.2 micrometers, 0.18 micrometers, 0.15 micrometers, 0.12 micrometers, 0.1 micrometers, 0.08 micrometers, 0.05 micrometers, 0.02 micrometers, etc. Along a direction away from the intermediate portion of the fourth subtype adjusting particle, the diameter of the first circumscribing circle of the first cross section located at a first end of the fourth subtype adjusting particle becomes smaller, and the diameter of the first circumscribing circle of the first cross section located at a second end of the fourth subtype adjusting particle becomes smaller. In some embodiments, along the extension direction of the long axis of the fourth subtype control particle, the diameter of the first circumscribing circle of the first cross-section located at the middle part of the fourth subtype control particle is uniform, and the diameters of the first circumscribing circle of the first cross-section located at the first end part of the fourth subtype control particle and located at the second end part of the fourth subtype control particle vary.

[0054] As can be understood, the diameter of the first circumscribing circle of the first cross section located at the first end of the fourth subtype regulating particle becomes smaller along the direction away from the intermediate portion of the fourth subtype regulating particle, and the diameter of the first circumscribing circle of the first cross section located at the first end of the fourth subtype regulating particle tends to become smaller in the direction away from the intermediate portion of the fourth subtype regulating particle, including, but not limited to, the diameter of the first circumscribing circle of the first cross section located at the first end of the fourth subtype regulating particle gradually becomes smaller in the direction away from the intermediate portion of the fourth subtype regulating particle.

[0055] As can be understood, the diameter of the first circumscribing circle of the first cross section located at the second end of the fourth subtype regulating particle becomes smaller along the direction away from the intermediate portion of the fourth subtype regulating particle, and the diameter of the first circumscribing circle of the first cross section located at the second end of the fourth subtype regulating particle tends to become smaller in the direction away from the intermediate portion of the fourth subtype regulating particle, including, but not limited to, the diameter of the first circumscribing circle of the first cross section located at the second end of the fourth subtype regulating particle gradually becomes smaller in the direction away from the intermediate portion of the fourth subtype regulating particle.

[0056] In some embodiments, the first cross-section of the fourth subtype conditioning particle may be a regular shape, such as a circle, an oval, a triangle, a square, or an irregular shape.

[0057] In some embodiments, the fourth subtype controlling particles may be needle-shaped particles with narrowing diameters at both ends.

[0058] In some embodiments, when the fourth subtype control particle is a needle-like particle with a smaller diameter at both ends, the shape of the first cross section of the fourth subtype control particle may be circular or elliptical. When the first cross section located at the middle part of the fourth subtype control particle is elliptical, the ratio of the major axis of the ellipse of the first cross section located at any part of the middle part of the fourth subtype control particle to the minor axis of the ellipse is greater than 1 and not greater than 3, for example, 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 control particle and at the second end of the fourth subtype control particle is the same as the shape of the first cross section located at the middle part of the fourth subtype control particle, and the area decreases along the direction away from the middle part of the fourth subtype control particle.

[0059] A first end of the fifth subtype adjusting particle is connected to a second end of the fifth subtype adjusting particle, and a diameter of a first circumscribing circle of the first cross section of the fifth subtype adjusting particle decreases along a direction from the first end of the fifth subtype adjusting particle to the second end of the fifth subtype adjusting particle.

[0060] As can be understood, this includes, but is not limited to, that along the direction from the first end of the fifth subtype conditioned particle to the second end of the fifth subtype conditioned particle, the diameter of the first circumscribing circle of the first cross section of the fifth subtype conditioned particle becomes smaller, that in the direction from the first end of the fifth subtype conditioned particle to the second end of the fifth subtype conditioned particle, the diameter of the first circumscribing circle of the first cross section of the fifth subtype conditioned particle tends to become smaller, and that in the direction from the first end of the fifth subtype conditioned particle to the second end of the fifth subtype conditioned particle, the diameter of the first circumscribing circle of the first cross section of the fifth subtype conditioned particle becomes successively smaller.

[0061] In some embodiments, the first cross-section of the fifth subtype conditioning particle may be a regular shape, such as a circle, an oval, a triangle, a square, or an irregular shape.

[0062] In some embodiments, the fifth subtype modulating particles may be long tapered particles.

[0063] In some embodiments, when the fifth subtype control particle is a long tapered particle, the first cross section of the fifth subtype control particle is circular or elliptical. Along the direction from the first end of the fifth subtype control particle to the second end of the fifth subtype control particle, the shape of the first cross section of the fifth subtype control particle is consistent and the area is reduced. When the fifth subtype control particle has an elliptical first cross section, the ratio of the major axis of the ellipse to the minor axis of the ellipse of any of the fifth subtype control particles is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0064] In some embodiments, the first subtype controlled particles and the second subtype controlled particles have a better effect of reducing the difference between the in-plane retardation value of the optical film 101 and the thickness direction retardation value of the optical film 101 than the third subtype controlled particles, the fourth subtype controlled particles, and the fifth subtype controlled particles, and the second subtype controlled particles have a better effect of reducing the difference between the in-plane retardation value of the optical film 101 and the thickness direction retardation value of the optical film 101 than the first subtype controlled particles. Therefore, preferably, the controlled particles 1012 include the first subtype controlled particles and / or the second subtype controlled particles. When the controlled particles 1012 include the first subtype controlled particles and the second subtype controlled particles, the mass fraction of the first subtype controlled particles in the controlled particles 1012 is greater than the mass fraction of the second subtype controlled particles in the controlled particles 1012. Preferably, the first type controlled particles 1012a are made of the second subtype controlled particles and / or the first subtype controlled particles. More preferably, the first type controlled particles 1012a are made of the second subtype controlled particles.

[0065] Referring to FIG. 1, in some embodiments, the conditioning particles 1012a may comprise the first type conditioning particles 1012a.

[0066] 2 and 3, in some embodiments, the adjustment particles 1012 include a second type adjustment particle 1012b in order to reduce the rainbow pattern problem of the optical film 101 while improving the chromaticity viewing angle and contrast of the optical film 101.

[0067] Here, the second type regulated particle 1012b includes a plurality of second cross sections, each of the second cross sections includes one second circumscribing circle, the ratio of the long axis length of the second type regulated 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, the ratio of the long axis length of the second type regulated particle 1012b to the diameter of the second circumscribing circle having the largest diameter among the plurality of second circumscribing circles is less than 100, and the second cross sections are perpendicular to the extension direction of the long axis of the second type regulated particle 1012b, and may be, 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. The diameter of the second circumscribing circle of one of the second cross sections of the second type adjustment particles 1012b is the distance between the two points on the second cross section that are the furthest apart. By using the second type adjustment particles 1012b with a relatively large aspect ratio (the ratio of the major axis length to the diameter of the first circumscribing circle with the largest diameter), more light rays can easily change the propagation direction through the adjustment particles 1012, which improves the rainbow problem and contributes to obtaining an improvement effect on the chromaticity viewing angle and contrast of the adjustment particles 1012.

[0068] The second type adjustment particles 1012b have a slightly weaker effect of reducing the difference between the in-plane retardation value of the optical film 101 and the thickness direction retardation value of the optical film 101 than the first type adjustment particles 1012a, and the relatively small second type adjustment particles 1012b can have a significant effect of improving the chromaticity viewing angle of the optical film 101. Therefore, the mass fraction of the second type adjustment particles 1012b in the adjustment particles 1012 is less than the mass fraction of the first type adjustment particles in the adjustment particles 1012a. For example, the mass fraction of the first type adjustment particles 1012a in the adjustment particles 1012 is greater than 50%, and the mass fraction of the second type adjustment particles in the adjustment particles 1012b is less than 50%. The mass fraction of the first type conditioning particles 1012a in the conditioning particles 1012 may be 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 99%, and the like.

[0069] In some embodiments, the particles of the second type regulated particles 1012b are at least one selected from the sixth subtype regulated particles, the seventh subtype regulated particles, the eighth subtype regulated particles, the ninth subtype regulated particles, and the tenth subtype regulated particles, which have different shapes from each other. Here, the change in diameter of the second circumscribing circle of the second cross section of the sixth subtype control particle along the extension direction of the long axis of the sixth subtype control particle is 0.3 micrometers or less, for example, 0 micrometers, 0.28 micrometers, 0.25 micrometers, 0.22 micrometers, 0.2 micrometers, 0.18 micrometers, 0.15 micrometers, 0.12 micrometers, 0.1 micrometers, 0.08 micrometers, 0.05 micrometers, 0.02 micrometers, etc. In some embodiments, along the extension direction of the long axis of the sixth subtype control particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the sixth subtype control particle is the same as the diameter of the second circumscribing circle of the second cross section at the middle part of the sixth subtype control particle, and the diameter of the second circumscribing circle of the second end of the sixth subtype control particle is the same as the diameter of the second circumscribing circle at the middle part of the sixth subtype control particle.

[0070] In some embodiments, the second cross-section of the sixth subtype conditioning particle may be a regular or irregular shape, such as a circle, an oval, a triangle, a square, or the like.

[0071] In some embodiments, the sixth subtype adjusting particle may be a rod-shaped particle, and when the sixth subtype adjusting particle is rod-shaped, the second cross section of the sixth subtype adjusting particle may be circular or elliptical. When the second cross section of the sixth subtype adjusting particle is circular, the second circumscribing circle of the second cross section of the sixth subtype adjusting particle may overlap with the second cross section. When the second cross section of the sixth subtype adjusting particle is elliptical, the diameter of the second circumscribing circle of each of the second cross sections of the sixth subtype adjusting particle is the major axis length of the ellipse of each of the second cross sections of the sixth subtype adjusting particle, and the ratio of the major axis of the ellipse of one of the second cross sections of one of the sixth subtype adjusting particles to the minor axis of the ellipse of the second cross section of the sixth subtype adjusting particle is greater than 1 and less than or equal to 3, and may be, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.2, 2.5, 2.8, etc.

[0072] The change in diameter of the second circumscribing circle of the second cross section located in the middle of the seventh subtype control particle along the extension direction of the long axis of the seventh subtype control particle is 1 micrometer or less, for example, 0 micrometers, 0.95 micrometers, 0.8 micrometers, 0.78 micrometers, 0.75 micrometers, 0.72 micrometers, 0.7 micrometers, 0.68 micrometers, 0.65 micrometers, 0.62 micrometers, 0.6 micrometers, 0.58 micrometers, 0.55 micrometers, 0.52 micrometers, It may be 0.5 micrometers, 0.48 micrometers, 0.45 micrometers, 0.42 micrometers, 0.4 micrometers, 0.38 micrometers, 0.35 micrometers, 0.32 micrometers, 0.3 micrometers, 0.28 micrometers, 0.25 micrometers, 0.22 micrometers, 0.2 micrometers, 0.18 micrometers, 0.15 micrometers, 0.12 micrometers, 0.1 micrometers, 0.08 micrometers, 0.05 micrometers, 0.02 micrometers, and the like.Along a direction away from the middle portion of the seventh subtype control particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the seventh subtype control particle becomes smaller, and the change in diameter of the second end of the seventh subtype control particle is 1 micrometer or less, for example, 0 micrometers, 0.95 micrometers, 0.8 micrometers, 0.78 micrometers, 0.75 micrometers, 0.72 micrometers, 0.7 micrometers, 0.68 micrometers, 0.65 micrometers, 0.62 micrometers, 0.6 micrometers, 0.58 micrometers, 0.55 micrometers. The diameter of the second circumscribing circle of the second cross section located at the first end of the seventh subtype adjustment particle may be smaller along a direction away from the intermediate portion of the seventh subtype adjustment particle, and the diameter of the second circumscribing circle of the second cross section located at the second end of the seventh subtype adjustment particle may be the same as the diameter of the second circumscribing circle of the second cross section located at the intermediate portion of the seventh subtype adjustment particle.

[0073] As can be understood, the diameter of the second circumscribing circle of the second cross section located at the first end of the seventh subtype regulating particle tends to become smaller along the direction away from the intermediate portion of the seventh subtype regulating particle, including, but not limited to, the diameter of the second circumscribing circle of the second cross section located at the first end of the seventh subtype regulating particle tends to become smaller in the direction away from the intermediate portion of the seventh subtype regulating particle, and the diameter of the second circumscribing circle of the second cross section located at the first end of the seventh subtype regulating particle tends to become smaller in the direction away from the intermediate portion of the seventh subtype regulating particle.

[0074] In some embodiments, the second cross-section of the seventh subtype conditioning particle may be a regular shape, such as a circle, an oval, a triangle, a square, or an irregular shape.

[0075] In some embodiments, the seventh subtype controlling particles may be needle-shaped particles having a smaller diameter at one end.

[0076] In some embodiments, when the seventh subtype controlling particle is a needle-shaped particle with a smaller diameter at one end, the second cross section of the seventh subtype controlling particle may be circular or elliptical. When the second cross section located at the second end of the seventh subtype controlling particle or located at the middle part of the seventh subtype controlling particle is elliptical, the ratio of the major axis of the ellipse of the second cross section located at either the second end or the middle part of the seventh subtype controlling particle to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The shape of the second cross section located at the first end of the seventh subtype controlling particle is the same as the shape of the second cross section located at the middle part of the seventh subtype controlling particle, and the area decreases along the direction away from the middle part of the seventh subtype controlling particle.

[0077] The change in diameter of the second circumscribing circle of the second cross section located in the middle of the eighth subtype control particle along the extension direction of the long axis of the eighth subtype control particle is 1 micrometer or less, for example, 0 micrometers, 0.95 micrometers, 0.8 micrometers, 0.78 micrometers, 0.75 micrometers, 0.72 micrometers, 0.7 micrometers, 0.68 micrometers, 0.65 micrometers, 0.62 micrometers, 0.6 micrometers, 0.58 micrometers, 0.55 micrometers, 0.52 micrometers, It may be 0.5 micrometers, 0.48 micrometers, 0.45 micrometers, 0.42 micrometers, 0.4 micrometers, 0.38 micrometers, 0.35 micrometers, 0.32 micrometers, 0.3 micrometers, 0.28 micrometers, 0.25 micrometers, 0.22 micrometers, 0.2 micrometers, 0.18 micrometers, 0.15 micrometers, 0.12 micrometers, 0.1 micrometers, 0.08 micrometers, 0.05 micrometers, 0.02 micrometers, etc. Along a direction away from the middle portion of the eighth subtype adjustment particle, the diameter of the second circumscribing circle of the second cross section located at a first end of the eighth subtype adjustment particle becomes smaller, and the diameter of the second circumscribing circle of the second cross section located at a second end of the eighth subtype adjustment particle becomes smaller. In some embodiments, the diameter of the second circumscribing circle of the second cross section located at the middle part of the eighth subtype control particle is uniform along the extension direction of the long axis of the eighth subtype control particle, and the diameters of the second circumscribing circle of the second cross section located at the first end of the eighth subtype control particle and located at the second end of the eighth subtype control particle vary.

[0078] As can be understood, the diameter of the second circumscribing circle of the second cross section located at the first end of the 8th subtype regulating particle tends to become smaller along the direction away from the intermediate portion of the 8th subtype regulating particle, including, but not limited to, the diameter of the second circumscribing circle of the second cross section located at the first end of the 8th subtype regulating particle tends to become smaller in the direction away from the intermediate portion of the 8th subtype regulating particle, and the diameter of the second circumscribing circle of the second cross section located at the first end of the 8th subtype regulating particle tends to become smaller in the direction away from the intermediate portion of the 8th subtype regulating particle.

[0079] As can be understood, the diameter of the second circumscribing circle of the second cross section located at the second end of the 8th subtype regulating particle becomes smaller along the direction away from the intermediate portion of the 8th subtype regulating particle, and the diameter of the second circumscribing circle of the second cross section located at the second end of the 8th subtype regulating particle tends to become smaller in the direction away from the intermediate portion of the 8th subtype regulating particle, including, but not limited to, the diameter of the second circumscribing circle of the second cross section located at the second end of the 8th subtype regulating particle gradually becomes smaller in the direction away from the intermediate portion of the 8th subtype regulating particle.

[0080] In some embodiments, the second cross-section of the eighth subtype conditioning particle may be a regular shape, such as a circle, an oval, a triangle, a square, or an irregular shape.

[0081] In some embodiments, the eighth subtype conditioning particles may be needle-shaped particles with narrowing diameters at both ends.

[0082] In some embodiments, when the 8th subtype adjusting particle is a needle-like particle with a smaller diameter at both ends, the shape of the second cross section of the 8th subtype adjusting particle may be circular or elliptical. When the second cross section located at the middle part of the 8th subtype adjusting particle is elliptical, the ratio of the long axis of the ellipse of the second cross section located at any part of the middle part of the 8th subtype adjusting particle to the short axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The shape of the second cross section located at the first end of the 8th subtype adjusting particle and at the second end of the 8th subtype adjusting particle is the same as the shape of the second cross section located at the middle part of the 8th subtype adjusting particle, and the area decreases along the direction away from the middle part of the 8th subtype adjusting particle.

[0083] A first end of the 9th subtype regulating particle is connected to a second end of the 9th subtype regulating particle, and a diameter of a second circumscribing circle of the second cross section of the 9th subtype regulating particle becomes smaller along a direction from the first end of the 9th subtype regulating particle to the second end of the 9th subtype regulating particle.

[0084] As can be understood, this includes, but is not limited to, a tendency that the diameter of the second circumscribing circle of the ninth cross section of the 9th subtype conditioned particle becomes smaller along the direction from the second end of the 9th subtype conditioned particle to the second end of the 9th subtype conditioned particle, a tendency that the diameter of the second circumscribing circle of the second cross section of the 9th subtype conditioned particle becomes smaller in the direction from the first end of the 9th subtype conditioned particle to the second end of the 9th subtype conditioned particle, and a tendency that the diameter of the second circumscribing circle of the second cross section of the 9th subtype conditioned particle becomes sequentially smaller in the direction from the first end of the 9th subtype conditioned particle to the second end of the 9th subtype conditioned particle.

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

[0086] In some embodiments, the ninth subtype modulating particles may be long tapered particles.

[0087] In some embodiments, when the 9th subtype adjusting particle is a long tapered particle, the second cross section of the 9th subtype adjusting particle is circular or elliptical. Along the direction from the first end of the 9th subtype adjusting particle to the second end of the 9th subtype adjusting particle, the shape of the second cross section of the 9th subtype adjusting particle is consistent and the area is reduced. When the second cross section of the 9th subtype adjusting particle is elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse of the second cross section of any of the 9th subtype adjusting particles is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0088] A first end of the 10th subtype adjusting particle is connected to a second end of the 10th subtype adjusting particle, and along a direction away from the second end of the 10th subtype adjusting particle, the diameter of a second circumscribing circle of the second cross section located at the first end of the 10th subtype adjusting particle becomes smaller, and along a direction away from the first end of the 10th subtype adjusting particle, the diameter of a second circumscribing circle of the second cross section located at the second end of the 10th subtype adjusting particle becomes smaller.

[0089] As can be understood, the diameter of the second circumscribing circle of the second cross section located at the first end of the 10 subtype regulated particle becomes smaller along the direction away from the second end of the 10 subtype regulated particle, the diameter of the second circumscribing circle of the second cross section located at the first end of the 10 subtype regulated particle tends to become smaller along the direction away from the second end of the 10 subtype regulated particle, and the diameter of the second circumscribing circle of the second cross section located at the first end of the 10 subtype regulated particle tends to become smaller along the direction away from the second end of the 10 subtype regulated particle, including, but not limited to, the diameter of the second circumscribing circle of the second cross section located at the first end of the 10 subtype regulated particle becomes sequentially smaller along the direction away from the second end of the 10 subtype regulated particle.

[0090] As can be understood, the diameter of the second circumscribing circle of the second cross section located at the second end of the 10 subtype regulated particle becomes smaller along the direction away from the first end of the 10 subtype regulated particle, the diameter of the second circumscribing circle of the second cross section located at the second end of the 10 subtype regulated particle tends to become smaller along the direction away from the first end of the 10 subtype regulated particle, and the diameter of the second circumscribing circle of the second cross section located at the second end of the 10 subtype regulated particle tends to become smaller along the direction away from the first end of the 10 subtype regulated particle, including, but not limited to, the diameter of the second circumscribing circle of the second cross section located at the second end of the 10 subtype regulated particle becomes sequentially smaller along the direction away from the first end of the 10 subtype regulated particle.

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

[0092] In some embodiments, the tenth subtype controlling particles may be double tapered particles and / or oval spherical particles.

[0093] In some embodiments, when the 10th subtype control particle is a double tapered particle and / or an oval spherical particle, the second cross section of the 10th subtype control particle is circular or elliptical. Along the direction away from the second end of the 10th subtype control particle, the shape of the second cross section located at the first end of the 10th subtype control particle is consistent and the area is reduced, and along the direction away from the first end of the 10th subtype control particle, the shape of the second cross section located at the second end of the 10th subtype control particle is consistent and the area is reduced. When the 10th subtype control particle has an elliptical shape, the ratio of the major axis of the ellipse to the minor axis of the ellipse of any of the second cross sections of the 10th subtype control particle is greater than 1 and less than or equal to 3, and may be, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0094] The difference between the 10th subtype control particle being a double tapered particle and an ellipsoidal particle is that when the 10th subtype control particle is a double tapered particle, the cross section parallel to the long axis direction of the 10th subtype control particle is a polygon such as a triangle or a rectangle, and when the 10th subtype control particle is an ellipsoidal particle, the cross section parallel to the long axis direction of the 10th subtype control particle is an ellipse.

[0095] In some embodiments, the major axis length of the second type adjustment particles 1012b is 1 micrometer or more, and the major axis length of the second type adjustment particles 1012b is 200 micrometers or less, for example, 5 micrometers, 10 micrometers, 50 micrometers, 60 micrometers, 70 micrometers, 80 micrometers, 90 micrometers, 100 micrometers, 120 micrometers, 150 micrometers, 180 micrometers, micrometers, etc., so as to effectively improve the chromaticity viewing angle of the optical film 101 while reducing the rainbow pattern problem of the optical film 101. Preferably, the major axis length of the second type adjustment particles 1012b is 40 micrometers or more, and the major axis length of the second type adjustment particles 1012b is 100 micrometers or less, so as to make the size of the second type adjustment particles 1012b more concentrated, which contributes to further comprehensively improving the optical performance of the optical film 101.

[0096] In some embodiments, when the regulating particles 1012 include the first type regulating particles 1012a and the second type regulating particles 1012b, and the first type regulating particles 1012a include the first subtype regulating particles and the second subtype regulating particles, the mass fraction of the second subtype regulating particles in the regulating particles 1012 is greater than the mass fraction of the first subtype regulating particles in the regulating particles 1012, and the mass fraction of the first subtype regulating particles in the regulating particles 1012 is greater than or equal to the mass fraction of the second subtype regulating particles 1012b in the regulating particles 1012.

[0097] In some embodiments, the mass fraction of the first subtype adjusting particles in the adjusting particle 1012 is 50% or more, such as 55%, 60%, 70%, 75%, 80%, 85%, 90%, 95%, 99%, 100%, etc. The mass fraction of the second subtype adjusting particles in the adjusting particle 1012 is 25% or more, such as 20%, 15%, 10%, 5%, 3%, 1%, 0%, etc. The mass fraction of the second subtype adjusting agent 1012b in the adjusting particle 1012 is 25% or more, such as 20%, 15%, 10%, 5%, 3%, 1%, 0%, etc.

[0098] In some embodiments, the second type regulated particle 1012b is at least two selected from the sixth subtype regulated particle, the seventh subtype regulated particle, the eighth subtype regulated particle, the ninth subtype regulated particle, and the tenth subtype regulated particle. Preferably, the second type regulated particle 1012b is a mixture of the sixth subtype regulated particle, the seventh subtype regulated particle, and the eighth subtype regulated particle, or the second type regulated particle 1012b is a mixture of the sixth subtype regulated particle, the ninth subtype regulated particle, and the tenth subtype regulated particle, or the second type regulated particle 1012b is a mixture of the sixth subtype regulated particle, the seventh subtype regulated particle, the eighth subtype regulated particle, the ninth subtype regulated particle, and the tenth subtype regulated particle. Since the second type regulated particles 1012b are selected from microparticles of at least two different shapes, the shape diversity of the second type regulated particles 1012b is increased, the optical anisotropy of the second type regulated particles 1012b is increased, and this contributes to improving the enhancing effect of the second type regulated particles 1012b on contrast and brightness. The second type controlled particles 1012b are selected from the 6th subtype controlled particles, the 7th subtype controlled particles, and the 8th subtype controlled particles, or the second type controlled particles 1012b are selected from the 6th subtype controlled particles, the 9th subtype controlled particles, and the 10th subtype controlled particles, or when the second type controlled particles 1012b are a mixture of the 6th subtype controlled particles, the 7th subtype controlled particles, the 8th subtype controlled particles, the 9th subtype controlled particles, and the 10th subtype controlled particles, the mass fraction of the 6th subtype controlled particles in the controlled particles 1012b is 1% to 8% or more, and may be, 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 7 subtype controlled particles in the controlled particles and / or the 9 subtype controlled particles in the 2 type controlled particles 1012b is 40% to 50% or more, and may be, for example, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, etc.The mass fraction of the 8th subtype controlled particle in the controlled particle and / or the 10th subtype controlled particle in the 2nd type controlled particle 1012b is 45% to 55% or more, and may be, for example, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, etc. Mixing the 6th subtype controlled particle, the 7th subtype controlled particle and / or the 9th subtype controlled particle, the 8th subtype controlled particle and / or the 10th subtype controlled particle in the above ratio contributes to further improving the contrast and brightness improvement effect of the obtained controlled particle 1012.

[0099] In some embodiments, the mass fraction of the adjusting particles 1012 in the optical film 101 is 20% or more, for example, 0.0001%, 0.001%, 0.01%, 0.02%, 0.05%, 0.1%, 0.5%, 1%, 5%, 8%, 10%, 12%, 15%, 18%, etc., and is uniformly dispersed in the optical film 101, effectively improving the rainbow pattern problem in the large angle direction of the optical film 101, and improving the display quality of the display device having the optical film 101. The adjusting particles 1012 have a small mass fraction in the optical film 101, which can effectively reduce the rainbow pattern in the large angle direction of the optical film 101, and the smaller the mass fraction, the better the dispersibility. Preferably, the mass fraction of the adjusting particles 1012 in the optical film 101 is 10% or less. More preferably, the mass fraction of the adjusted particles 1012 in the optical film 101 is 5% or less. Even more preferably, the mass fraction of the adjusted particles 1012 in the optical film 101 is 1% or less. Even more preferably, the mass fraction of the adjusted 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 adjusted particles 1012 in the optical film 101 can fully exert the effect of effectively improving the rainbow pattern in the large angle direction of the optical film 101, the mass fraction of the adjusted particles 1012 in the optical film 101 may be 0.001% or more, preferably 0.003% or more, more preferably 0.005% or more, even more preferably 0.015% or more, and even more preferably 0.03% or more.

[0100] In some embodiments, the second type adjusted particles 1012b are whiskers. The material of the first type adjusted particles 1012a and the material of the second type adjusted particles 1012b are at least one selected from the group consisting of silica, silicon carbide, silicon nitride, zinc oxide, magnesium oxide, aluminum oxide, calcium sulfate, calcium carbonate, potassium titanate, and aluminum borate.

[0101] In some embodiments, the second type regulated particles 1012b and / or the first type regulated particles 1012a may be surface-modified to improve the dispersibility of the second type regulated particles 1012b and / or the first type regulated particles 1012ab in the substrate 1011 or to improve the functionality of the second type regulated particles 1012b and / or the first type regulated particles 1012a, such as toughness. When the second type regulated particles 1012b and / or the first type regulated particles 1012a are surface-modified, the surface of the second type regulated particles 1012b and / or the first type regulated particles 1012a is modified by at least one of inorganic cations, inorganic anions, polymers, coupling agents, or surfactants. That is, the surface of the second type regulated particles 1012b and / or the first type regulated particles 1012a includes at least one of inorganic cation groups, inorganic anion groups, polymer groups, coupling agent groups, or surfactant groups.

[0102] Specifically, the surface of the second type control particle 1012b and / or the first type control particle 1012a is modified with at least one selected from magnesium chloride, calcium chloride, barium chloride, strontium chloride, stearic acid, sodium stearate, zinc octadecanoate, sulfonic acid surfactant, thio surfactant, titanate ester, aluminum acid ester, polyacrylamide, silane, alkyl phosphate ester, aryl phosphate ester, alkyl phosphate, aryl phosphate, alkyl alcohol amide phosphate ester, imidazoline phosphate ester, imidazoline phosphate, high polyphosphate ester, high polyphosphate, and silicone phosphate ester. Preferably, the surface of the second type control particle 1012b and / or the first type control particle 1012a is modified with at least one of sulfonic acid surfactant or thio surfactant. The sulfonic acid surfactant is at least one selected from alkyl sulfonates and fluoroalkyl sulfonates, specifically, for example, at least one selected from sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, and sodium fluorododecyl sulfonate. The thio surfactant is at least one selected from thiols and fluorothiols, specifically, for example, at least one selected from octylthiol, dodecylthiol, tetradecylthiol, octadecylthiol, fluorooctylthiol, and fluorododecylthiol. After the sulfonic acid-based surfactant is mixed with the surface-modified regulating particles 1012, the sulfonic acid-based surfactant groups form a sulfonic acid group shell layer, such as a benzene ring sulfonic acid group shell layer, on the surface of the whiskers, protecting the regulating particles 1012, improving the toughness of the regulating particles 1012, and contributing to reducing breakage of the second type regulating particles 1012b and / or the first type regulating particles 1012a in the optical film 101.After the thio surfactant group is mixed with the surface-modified regulating particles 1012, the thio surfactant group and the hydroxyl group on the whisker surface form an O-S-O crosslinked network, and the bond energy of O-S-O is relatively large, which protects 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 light diffusion film 101, reduces the breakage of the second type regulating particles 1012b and / or the first type regulating particles 1012a, and contributes to enhancing the improving effect of the second type regulating particles 1012b and / or the first type regulating particles 1012a on optical functions such as contrast and brightness. More preferably, the second type regulating particles 1012b and / or the first type regulating particles 1012a are at least one of fluorine-substituted sulfonic acid surfactants and fluorine-substituted thio surfactants, specifically, for example, at least one of sodium fluorododecylsulfonate, fluorooctylthiol, and fluorothiol, so that the fluorine atoms have high stability in the alkyl chain, the bond energy of the carbon-fluorine bond is higher than the bond energy of the carbon-carbon bond, and the carbon-fluorine bond has a shielding effect on the carbon-carbon bond, contributing to the protection of the carbon-carbon bond, thereby improving the stability of the second type regulating particles 1012b and / or the first type regulating particles 1012a.

[0103] In some embodiments, the refractive index difference between the substrate 1011 and the adjusting particles 1012 is greater than 0.02, such as 0.03, 0.05, 0.09, 0.1, 0.15, 0.2, etc., and the adjusting particles 1012 can improve the rainbow problem caused by the optical film 101, achieve light diffusion function, and further improve the optical performance of the optical film 101. Preferably, the refractive index difference between the substrate 1011 and the adjusting particles 1012 is greater than 0.1, such as 0.12, 0.13, 0.14, 0.15, 0.2, etc.

[0104] In some embodiments, the substrate 1011 has a glass transition temperature between 70°C and 600°C, such as 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.

[0105] In some embodiments, the substrate 1011 has a modulus of elasticity of 5000 MPa to 5000 MPa at 23° C., for example, 600 MPa, 700 MPa, 800 MPa, 900 MPa, 1000 MPa, 1200 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2200 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3200 MPa, 3500 MPa, 3800 MPa, 4000 MPa, 4200 MPa, 4500 MPa, 4800 MPa, etc.

[0106] In some embodiments, the elastic modulus of the substrate 1011 is obtainable at a humidity of 50%.

[0107] In some embodiments, the thickness of the optical film 101 is 5 micrometers or more, and the thickness of the optical film 101 may be 500 micrometers or less, such as 10 micrometers, 50 micrometers, 60 micrometers, 100 micrometers, 150 micrometers, 200 micrometers, 250 micrometers, 300 micrometers, 350 micrometers, 400 micrometers, 450 micrometers, etc., to facilitate processing of the optical film 101 and maintain suitable light transmittance of the optical film 101. Preferably, the thickness of the light diffusion film is 15 micrometers or more, and the thickness of the light diffusion film may be 150 micrometers or less, such as 20 micrometers, 25 micrometers, 30 micrometers, 40 micrometers, 50 micrometers, 60 micrometers, 80 micrometers, 100 micrometers, 120 micrometers, 130 micrometers, 140 micrometers, etc.

[0108] The optical film 101 provided in the embodiment of the present invention is used to reduce the difference between the in-plane retardation value and the thickness direction retardation value of the optical film 101 by adding the adjusting particles 1012 to the substrate 1011 of the optical film 101, thereby improving the problem of rainbow patterns caused by the optical film 101.

[0109] 4 to 7, the embodiment of the present invention further provides a polarizer 100, which includes an optical film 101. The polarizer 100 includes an optical film 101, which is a light-transmitting film.

[0110] The polarizing plate 100 further includes a polarizing layer 102 disposed on one side of the optical film 101 .

[0111] 4 to 7, in some embodiments, the polarizer 100 further includes a second optical functional layer 103 located on at least one side of the substrate 1011.

[0112] 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 .

[0113] In some embodiments, the second optical functional layer 103 is located on the side of the optical film 101 away from the polarizing layer 102, and the polarizing plate 100 further includes a first adhesive layer 104 located on the side of the optical film 101 closer to the polarizing layer 102.

[0114] Here, the first adhesive layer 104 is in direct contact with the polarizing layer 102, or the polarizing plate 100 further includes a protective layer 105 positioned between the optical film 101 and the polarizing layer 102, and the first adhesive layer 104 is in direct contact with the protective layer 105.

[0115] In some embodiments, the first adhesive layer 104 is in direct contact with the optical film 101, and the first adhesive layer 104 is in direct contact with the polarizing layer 102, or the first adhesive layer 104 is in direct contact with the optical film 101 and the first adhesive layer 104 is in direct contact with the protective layer 105.

[0116] In some embodiments, the first adhesive layer 104 is at least one selected from the group consisting of water gum, pressure sensitive adhesive, and UV adhesive, where the water gum material can be selected from polyvinyl alcohol, the pressure sensitive adhesive material can be selected from acrylic ester copolymers, and the UV adhesive material can be selected from multifunctional acrylic ester monomers.

[0117] 4 to 6, 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 layer. When the second optical functional layer 103 is a low-reflection sub-layer 108, the low-reflection sub-layer 108 can be formed by laminating a transparent hardening sub-portion 108a and a low-refractive sub-portion 108b.

[0118] In some embodiments, the polarizing layer 102 is made of polyvinyl alcohol and a dye.

[0119] In some embodiments, the polarizing plate 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 adhered to each other via a second adhesive layer 110. When the polarizing plate 100 is applied to a display device, the release layer 109 is removed to expose the second adhesive layer 110, and the polarizing plate 100 is attached to a display panel via the second adhesive layer 110.

[0120] In some embodiments, the polarizer 100 further includes a compensation layer 111 located between the second adhesive layer 110 and the polarizing layer 102 .

[0121] In the embodiment of the present invention, the optical film 101 is provided to avoid optical defects such as moire and white spots caused by the polarizing plate 100, and to improve the chromaticity viewing angle and contrast when a display device having the polarizing plate 100 is used.

[0122] Referring to FIG. 8, an embodiment of the present invention further provides a display device 10 , which includes the polarizer 100 .

[0123] Specifically, the display device includes a display panel 200 and a first polarizer 300, the first polarizer 300 being located on the light-emitting side of the display panel 200, and the first polarizer 300 being selected from the polarizers 100 described above.

[0124] 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.

[0125] In some embodiments, the optical film 101 of the first polarizer 300 is located on the side of the polarizing layer 102 of the first polarizer 300 that is away from the display panel.

[0126] When the display panel 200 is a liquid crystal display panel, the display device 10 further includes a backlight module 400 located on a side of the display panel 200 farther from the first polarizer 300, the backlight module 400 being used to provide a light source to 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 polarizer 100, or the second polarizer 500 may not be selected from the polarizer 100. EXAMPLES

[0127] 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 understood as limiting the present invention in any way.

[0128] [Example 1] In this embodiment, the substrate material is unmodified polyethylene terephthalate, and the control particles in the substrate are spherical silica. After mixing the substrate and the control particles, an optical film 1 having a thickness of 60 micrometers is formed by MD (moving direction) stretching and TD (transfer direction) stretching (stretching ratio MD×TD is 5×3), and the mass fraction of the control particles in the optical film 1 is 0.05%.

[0129] [Example 2] This embodiment is the same as or similar to embodiment 1, except that the mass fraction of the controlled particles in the formed optical film 2 is 0.1%.

[0130] [Example 3] This embodiment is the same as or similar to Example 1, except that the mass fraction of the controlled particles in the formed optical film 3 is 0.2%.

[0131] [Example 4] This embodiment is similar to Example 1, except that the mass fraction of the controlled particles in the formed optical film 4 is 0.5%.

[0132] [Example 5] This embodiment is similar to Example 1, except that the mass fraction of the controlled particles in the formed optical film 5 is 0.8%.

[0133] [Example 6] This embodiment is similar to Example 1, except that the mass fraction of the controlled particles in the formed optical film 6 is 1%.

[0134] [Example 7] This embodiment is similar to Example 4, except that the thickness of the optical film 7 is 55 micrometers.

[0135] [Example 8] This embodiment is similar to the embodiment 4, except that the controlled particles are rod-shaped silica, and an optical film 8 is formed.

[0136] [Example 9] This embodiment is similar to the embodiment 4, except that the controlled particles are formed by mixing rod-shaped silica, spherical silica, and cubic silica in a mass ratio of 2:6:2 to form the optical film 9.

[0137] [Example 10] In this embodiment, the material of the substrate is unmodified polymethyl methacrylate, the control particles in the substrate are spherical polystyrene, the substrate is mixed with the control particles to form an optical film 10 having a thickness of 40 micrometers, and the mass fraction of the control particles in the optical film 10 is 0.02%.

[0138] [Example 11] This embodiment is similar to the embodiment 10, except that the controlled particles are rod-shaped polystyrene to form the optical film 11, and the mass fraction of the controlled particles in the optical film 11 is 0.05%.

[0139] [Example 12] This embodiment is similar to Example 10, except that the controlled particles are formed by mixing rod-shaped polystyrene, spherical polystyrene, and cubic polystyrene in a mass ratio of 2:6:2 to form the optical film 12, and the mass fraction of the controlled particles in the optical film 12 is 0.5%.

[0140] [Example 13] In this embodiment, the material of the substrate is unmodified polycarbonate, the control particles in the substrate are spherical polystyrene, the substrate is mixed with the control particles to form an optical film 12 having a thickness of 50 micrometers, and the mass fraction of the control particles in the optical film 13 is 0.2%.

[0141] [Example 14] This embodiment is similar to the embodiment 13, except that the adjusting particles are rod-shaped polystyrene, and the optical film 14 is formed.

[0142] [Example 15] This embodiment is similar to the embodiment 13, except that the controlled particles are formed by mixing rod-shaped polystyrene, spherical polystyrene, and cubic polystyrene in a mass ratio of 2:6:2 to form the optical film 15.

[0143] [Example 16] This embodiment is similar to Example 11, except that the substrate and the control particles are mixed to form an optical film 16 having a thickness of 80 micrometers, and the mass fraction of the control particles in the optical film 16 is 0.03%.

[0144] [Example 17] This embodiment is similar to embodiment 16, except that the mass fraction of the control particles in the optical film 17 is 0.015%.

[0145] [Example 18] This embodiment is similar to embodiment 16, except that the mass fraction of the tuning particles in the optical film 18 is 0.005%.

[0146] [Example 19] This embodiment is similar to Example 16, except that the mass fraction of the controlled particles in the optical film 19 is 0.003%.

[0147] [Example 20] This embodiment is similar to Example 16, except that the mass fraction of the control particles in the optical film 20 is 0.001%.

[0148] [Comparative Example 1] This comparative example is similar to Example 1, except that it does not have adjustment particles, and a comparative optical film 1 is formed.

[0149] The in-plane retardation values ​​of the optical films obtained in Examples 1 to 15 and the comparative optical film obtained in Comparative Example 1 were measured using an Optipro-micro phase retardation measuring device manufactured by Shintech. The results are shown in Table 1.

[0150] The optical films obtained in Examples 1 to 15 and the comparative optical film obtained in Comparative Example 1 were placed on the side of a polarizing plate farther from the display panel, and the polarizing plate was attached to the surface of a 75-inch liquid crystal display panel to observe the rainbow pattern in normal and side views, and the results are shown in Table 1. Here, the observation results of "clear rainbow pattern", "relatively clear rainbow pattern", "slight rainbow pattern", and "unclear rainbow pattern" indicate that the conspicuousness of the observed rainbow pattern decreases in order, and "no rainbow pattern" indicates that the rainbow pattern phenomenon is not observed. The polarizing plate to be tested includes a compensation layer, a polarizing layer, a protective layer, a light diffusion film (or a comparative optical film), and a transparent cured sub-layer, which are laminated in this order.

[0151] The light diffusion films obtained in Examples 4 and 8 were placed on the side of a polarizing plate farther from the display panel, and the polarizing plate was attached to the surface of a 75-inch liquid crystal display panel to carry out further optical effect tests, the results of which are shown in Table 2. The polarizing plate to be tested includes a compensation layer, a polarizing layer, a protective layer, a light diffusion film (or a comparative optical film), and a transparent cured sub-layer, which are laminated in this order.

[0152] The luminance viewing angle is the value of the lateral viewing angle corresponding to the case where the luminance at the lateral viewing angle is half that at the square viewing angle.

[0153] Chrominance visual angle measurement is based on the CCIS standard (CESI 0.03).

[0154] [Table 1]

[0155] [Table 2]

[0156] From Table 1, it can be seen that by adding the adjusting particles into the optical film, the in-plane retardation value of the optical film is effectively reduced, and the rainbow pattern problem is improved and even eliminated. In addition, regarding the reduction of the in-plane retardation value of the optical film, the spherical particles have the highest effect of reducing the in-plane retardation value of the optical film, the adjusting particles using a mixed composition of particles of multiple shapes have the next highest effect of reducing the in-plane retardation value of the optical film, and the rod-shaped particles have the lowest effect of reducing the in-plane retardation value of the optical film. In addition, when the in-plane retardation value is reduced to 1000 nanometers or less, the rainbow pattern problem of the optical film is more significantly improved, and when the in-plane retardation value is reduced to 200 nanometers or less, the rainbow pattern of the optical film is completely eliminated. From Table 2, it can be seen that the rod-shaped particles are superior to the spherical particles in adjusting the chromaticity viewing angle and luminance viewing angle of the optical film.

[0157] The embodiments of the present invention disclose an optical film, a polarizing plate and a display device. The optical film comprises a substrate and adjustment particles dispersed in the substrate, the optical film has an in-plane retardation value, and the in-plane retardation value of the optical film is less than 3000 nanometers. The present invention reduces the in-plane retardation value of the optical film to less than 3000 nanometers by putting adjustment particles into the substrate of the optical film, and reduces the difference between the in-plane retardation value of the optical film and the thickness direction retardation value, thereby improving the problem of rainbow pattern caused by the optical film.

[0158] The above provides a detailed description of the optical film, polarizing plate, and display device provided in the examples of the present invention, and specific examples are applied to the text to describe the principles and embodiments of the present invention. However, the above description of the examples is intended to aid in understanding the method of the present invention and its central idea. At the same time, those skilled in the art will recognize that there are changes in the specific embodiments and application scope based on the idea of ​​the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An optical film, A substrate and adjustment particles dispersed within the substrate, The optical film has an in-plane retardation value, and the in-plane retardation value of the optical film is less than 3000 nanometers; Optical film.

2. The in-plane retardation value of the optical film is 1000 nanometers or less.

2. The optical film according to claim 1 .

3. The in-plane retardation value of the optical film is 500 nanometers or less.

3. The optical film according to claim 2.

4. The in-plane retardation value of the optical film is 200 nanometers or less.

2. The optical film according to claim 1 .

5. The optical film has a thickness direction retardation value, a ratio of an in-plane retardation value of the optical film to a thickness direction retardation value of the optical film is greater than 0.1; The ratio of the in-plane retardation value of the optical film to the thickness direction retardation value of the optical film is less than 2.

5. The optical film according to claim 1, wherein the optical film is a fluororesin.

6. The adjusting particles include a first type adjusting particle and / or a second type adjusting particle, The first type conditioning particle has a plurality of first cross sections, each of the first cross sections having a first circumscribing circle; a ratio of a major axis length of the first type adjustment particle to a diameter of the first circumscribing circle having a maximum diameter among the plurality of first circumscribing circles is 1 or more; The ratio of the major axis length of the first type adjustment 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 conditioning particle has a plurality of second cross sections, each of the second cross sections having a second circumscribing circle; a ratio of the length of the major axis of the second type adjustment particle to the diameter of the second circumscribing circle having the largest diameter among the plurality of second circumscribing circles is 5 or more; The ratio of the length of the major axis of the second type adjustment particle to the diameter of the second circumscribing circle having the largest diameter among the plurality of second circumscribing circles is 50 or less.

2. The optical film according to claim 1 .

7. The first type control particle is at least one selected from the group consisting of a first subtype control particle, a second subtype control particle, a third subtype control particle, a fourth subtype control particle, and a fifth subtype control particle, which have different shapes from each other; The second type control particle is at least one selected from the group consisting of a sixth subtype control particle, a seventh subtype control particle, an eighth subtype control particle, a ninth subtype control particle, and a tenth subtype control particle, each having a different shape; a change in diameter of a first circumscribing circle of the first cross section of the first subtype controlling particle along the extending direction of the long axis of the first subtype controlling particle is 0.3 micrometers or less; a first end of the second subtype controlling particle is connected to a second end of the second subtype controlling particle, and a diameter of a first circumscribing circle of the first cross section located at the first end of the second subtype controlling particle gradually decreases along a direction away from the second end of the second subtype controlling particle; Along a direction away from the first end of the second subtype controlling particle, a diameter of a first circumscribing circle of the first cross section located at the second end of the second subtype controlling particle gradually decreases, a change in diameter of a first circumscribing circle of the first cross section located at a middle portion of the third subtype control particle along an extension direction of the long axis of the third subtype control particle is 1 micrometer or less; a diameter of a first circumscribing circle of the first cross section located at a first end of the third subtype controlling particle gradually decreases along a direction away from the middle portion of the third subtype controlling particle; The diameter change value of the first circumscribing circle of the first cross section located at the second end of the third subtype adjusting particle is 1 micrometer or less; the change in diameter of the first circumscribing circle of the first cross section located at the middle of the fourth subtype control particle along the extending direction of the long axis of the fourth subtype control particle is 1 micrometer or less; a diameter of a first circumscribing circle of the first cross section located at a first end of the fourth subtype controlling particle gradually decreases along a direction away from the intermediate portion of the fourth subtype controlling particle; The diameter of the first circumscribing circle of the first cross section located at the second end of the fourth subtype adjusting particle is gradually reduced; a first end of the fifth subtype adjusting particle is connected to a second end of the fifth subtype adjusting particle, and a diameter of a first circumscribing circle of the first cross section of the fifth subtype adjusting particle gradually decreases along a direction from the first end of the fifth subtype adjusting particle to the second end of the fifth subtype adjusting particle; a change in diameter of a second circumscribing circle of a second cross section of the sixth subtype controlling particle along an extension direction of the long axis of the sixth subtype controlling particle is 0.3 micrometers or less; a change in diameter of a second circumscribing circle of the second cross section located at a middle portion of the seventh subtype control particle along a direction in which the long axis of the seventh subtype control particle extends is 1 micrometer or less; a diameter of a second circumscribing circle of the second cross section located at a first end of the seventh subtype control particle gradually decreases along a direction away from the middle portion of the seventh subtype control particle; The diameter change value of the second circumscribing circle of the second cross section located at the second end of the seventh subtype adjusting particle is 1 micrometer or less; a change in diameter of a second circumscribing circle of the second cross section located at a middle portion of the eighth subtype control particle along a direction in which the long axis of the eighth subtype control particle extends is 1 micrometer or less; Along a direction away from the middle portion of the eighth subtype control particle, a diameter of a second circumscribing circle of the second cross section located at a first end portion of the eighth subtype control particle gradually decreases; The diameter of the second circumscribing circle of the second cross section located at the second end of the eighth subtype adjusting particle is gradually reduced; a first end of the ninth subtype adjusting particle is connected to a second end of the ninth subtype adjusting particle, and a diameter of a second circumscribing circle located on the second cross section of the ninth subtype adjusting particle gradually decreases along a direction from the first end of the ninth subtype adjusting particle to the second end of the ninth subtype adjusting particle; a first end of the 10th subtype adjusting particle is connected to a second end of the 10th subtype adjusting particle, and a diameter of a second circumscribing circle of the second cross section located at the first end of the 10th subtype adjusting particle gradually decreases along a direction away from the second end of the 10th subtype adjusting particle; Along a direction away from the first end of the 10th subtype control particle, a diameter of a second circumscribing circle of the second cross section located at the second end of the 10th subtype control particle gradually decreases.

7. The optical film according to claim 6.

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

9. The substrate includes a first sub-substrate and / or a second sub-substrate, The first sub-substrate is at least one selected from the group consisting of unmodified polyester and unmodified acetate fiber; The second sub-substrate is at least one selected from the group consisting of modified polyester and modified acetate cellulose; The mass fraction of the first sub-substrate in the substrate is 65% or more, and the mass fraction of the first sub-substrate in the substrate is 100% or less, The mass fraction of the second sub-substrate in the substrate is 0% or more, and the mass fraction of the second sub-substrate in the substrate is 35% or less.

2. The optical film according to claim 1 .

10. A polarizing plate, The optical film according to any one of claims 1 to 9, A polarizing plate characterized by:

11. A display device, comprising: The polarizing plate according to claim 10, A display device comprising:

Images