CN115712213A - Optical diaphragm and backlight module - Google Patents
Optical diaphragm and backlight module Download PDFInfo
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- CN115712213A CN115712213A CN202211274586.1A CN202211274586A CN115712213A CN 115712213 A CN115712213 A CN 115712213A CN 202211274586 A CN202211274586 A CN 202211274586A CN 115712213 A CN115712213 A CN 115712213A
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Abstract
The application discloses optical film and backlight module, optical film includes basement, a plurality of micro-structure and a plurality of diffusion particle. The plurality of microstructures are arranged on the substrate, and one side, far away from the substrate, of each microstructure is provided with a concave groove. The diffusion particles are disposed in the recess grooves. The microstructures are used for dividing incident light into a plurality of emergent light. The microstructure with the concave groove can divide incident light into a plurality of emergent light beams, so that the light beams are uniformly emergent, and the emergent uniformity is improved. And arranging the diffusion particles in the concave grooves of the microstructure, and irradiating the light rays passing through the microstructure to the surfaces of the diffusion particles. Part of the light forms diffuse transmission on the surface of the diffusion particles, and the scattering effect is realized. Part of the light forms diffuse reflection on the surface of the diffusion particles, and the reflection effect is realized. And the diffusion particles are arranged in the concave groove, the thickness of the optical film can be reduced. The optical film can simultaneously realize light splitting and scattering to uniform light, and avoids the problem of overlarge film thickness caused by the superposition use of multiple layers of optical films.
Description
Technical Field
The application belongs to the technical field of display, and particularly relates to an optical film of a backlight module.
Background
Generally, light emitted by an Led lamp panel is direct light, and the display light effect is poor due to dazzling light and single direction. Although the Led lamps are uniformly distributed on the Led lamp plate, an interval exists between the Led lamps and the lamp, and a gap also exists between the lamp plate and the lamp plate, so that the whole light is not uniform in light emitting, and further, the picture display is not uniform. The existing optical film can only realize the light splitting effect of light or can only realize the scattering effect, so that the multilayer optical films are required to be overlapped for use, and the problem of overlarge film thickness also occurs.
Therefore, in order to make the Led backlight module emit light uniformly and softly, the thickness of the Led backlight module can be reduced, and the optical film capable of realizing the light splitting effect and the scattering effect at the same time becomes a problem to be solved urgently.
Disclosure of Invention
The application aims to provide an optical film, can realize beam split effect and scattering effect simultaneously, improves backlight unit's light-emitting homogeneity, improves out bright dark uneven problem.
In order to solve the above technical problem, the present application provides an optical film, including:
a substrate;
the microstructures are arranged on the substrate, and one side of each microstructure, which is far away from the substrate, is provided with a concave groove; the microstructure is used for dividing incident light into a plurality of emergent light rays;
a plurality of diffusion particles disposed within the recessed trench.
In some embodiments, the surface of the microstructure remote from the substrate has a concave surface; the diffusion particles are attached to the concave surface.
In some embodiments, the optical film further includes a colloid, and the diffusion particles are doped in the colloid, and the colloid is disposed in the concave groove.
In some embodiments, the diffusion particles have a particle size less than the depth of the recessed grooves; the height of any of the diffusion particles is less than or equal to the height of the microstructure, based on the substrate.
In some embodiments, a plurality of the diffusion particles differ in particle size.
In some embodiments, the plurality of diffusion particles includes first particles and second particles, a particle size of the first particles is larger than a particle size of the second particles, and a ratio of the number of the first particles to the number of the second particles is less than 1.
In some embodiments, the refractive index of the diffusing particles is different from the refractive index of the microstructures.
In some embodiments, the plurality of diffusion particles includes first particles and second particles, and the refractive index of the first particles is different from the refractive index of the second particles.
In some embodiments, the microstructure comprises a plurality of sub-portions, and the plurality of sub-portions are sequentially connected end to end along the circumferential direction to form a closed structure; in the microstructure, the width of the sub-portion decreases in a direction from a side close to the substrate to a side far from the substrate.
The embodiment of the application further provides a backlight module, which comprises a light-emitting substrate and the optical film arranged on the light-emitting substrate.
The optical film provided by the embodiment of the application comprises a substrate, a plurality of microstructures and a plurality of diffusion particles. The plurality of microstructures are arranged on the substrate, and one side of each microstructure, which is far away from the substrate, is provided with a concave groove. A plurality of diffusion particles are disposed in the recess groove. The microstructure is used for dividing incident light into a plurality of emergent light beams.
The optical film provided by the embodiment of the application divides incident light into a plurality of emergent light rays through the micro structure with the concave groove, so that the light rays are uniformly emitted, and the light emitting uniformity is improved. And then the diffusion particles are arranged in the concave grooves of the microstructure, and the light rays passing through the microstructure irradiate the surfaces of the diffusion particles. Part of the light forms diffuse transmission on the surface of the diffusion particles, and the scattering effect is realized. Part of the light forms diffuse reflection on the surface of the diffusion particles, and the reflection effect is realized. And because the microstructure is provided with the concave groove, the diffusion particles are arranged in the concave groove, and the thickness of the optical film is reduced. Because the optical film can realize the functions of light splitting and scattering at the same time, the problem of overlarge film thickness caused by the superposition use of multiple layers of optical films is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings may be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view of a first structure of an optical film provided in an embodiment of the present application;
FIG. 2 is a second schematic diagram of an optical film provided in an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a third structure of an optical film provided in the embodiment of the present application;
FIG. 4 is a schematic diagram of a fourth structure of an optical film provided in the embodiment of the present application;
FIG. 5 is a schematic diagram illustrating a fifth structure of an optical film according to an embodiment of the present disclosure;
FIG. 6 is a schematic perspective view of a microstructure and diffusion particles provided in an embodiment of the present application;
FIG. 7 is a top view of an optical film provided by an embodiment of the present application;
fig. 8 is a schematic structural diagram of a backlight module according to an embodiment of the present application.
Reference numerals: 1-a substrate; 2-microstructure; 3-diffusing particles; 4-colloid; 2 a-a concave trough; 2 b-a concave surface; 2 p-subsection; 3 a-first particles; 3 b-second particles; 10-an optical film; 20-a light-emitting substrate; 100-backlight module.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that in the description of the present application, it is to be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific direction, be configured and operated in a specific direction, and thus, cannot be construed as limiting the present application.
Referring to fig. 1, an embodiment of the present disclosure provides an optical film 10 including a substrate 1, a plurality of microstructures 2, and a plurality of diffusion particles 3. The plurality of microstructures 2 are arranged on the substrate 1, and one side of the microstructures 2 far away from the substrate 1 is provided with a concave groove 2a. A plurality of diffusion particles 3 are disposed in the concave groove 2a. The microstructure 2 is used for dividing incident light into a plurality of emergent light.
Wherein, the length of the micro-structure 2 can be 50 to 200 micrometers. For example, the length of the microstructures 2 is 50 microns, 100 microns, 150 microns, or 200 microns.
The optical film 10 provided by the embodiment of the application divides incident light into a plurality of emergent light beams by arranging the microstructure 2 with the concave groove 2a, so that the light beams are uniformly emitted, and the light emitting uniformity is improved. Then, the diffusion particles 3 are disposed in the concave grooves 2a of the microstructure 2, and light passing through the microstructure 2 is irradiated to the surfaces of the diffusion particles 3. Part of the light forms diffuse transmission on the surface of the diffusion particles 3, and the scattering effect is realized. Part of the light forms diffuse reflection on the surface of the diffusion particles 3, and the reflection effect is realized. And since the microstructures 2 have the concave grooves 2a, the diffusion particles 3 are disposed in the concave grooves 2a, reducing the thickness of the optical film 10. Because the optical film 10 can realize the functions of light splitting and scattering at the same time, the problem of overlarge film thickness caused by the overlapping use of the multilayer optical film 10 is avoided.
Specifically, when the incident light is dispersed into a plurality of light beams by the microstructures 2, the light beams are emitted from a surface of one side of the microstructures 2 away from the substrate 1. Since the surfaces of the diffusion particles 3 are curved surfaces, the light passing through the microstructure 2 is irradiated to the surfaces of the diffusion particles 3. Part of the light rays are subjected to diffuse transmission, and part of the light rays are subjected to diffuse reflection. The term "diffuse reflection" refers to a phenomenon in which light projected on a rough surface is reflected in various directions. Diffuse transmission, which means that when light passes through a transmitting material with a rough surface, the transmitted light diffuses out and there is no regular transmission on a macroscopic scale.
In the embodiment of the present application, the surface of the microstructure 2 away from the substrate 1 has a concave surface 2b. The diffusion particles 3 are attached to the concave surface 2b.
Specifically, the plurality of diffusion particles 3 are attached to the concave surface 2b of the microstructure 2, so that the surface of the microstructure 2 away from the substrate 1 is in a concave-convex shape. The light rays entering the microstructure 2 irradiate to the interface between the diffusion particles 3 and the microstructure 2, the light rays are scattered in different directions and penetrate through the diffusion particles 3 to form diffuse transmission, and the uniformity of the brightness of the light rays in all directions is further improved.
Alternatively, the microstructures 2 may be formed by a transfer process and then cured by Ultraviolet (UV) irradiation. The diffusion particles 3 are sprayed or spin-coated on the surface of the microstructure 2. The microstructures 2 may also be formed by a nip extrusion process.
When the microstructure 2 is prepared by a transfer printing process, a substrate 1 may be formed of a resin material such as polyethylene terephthalate (PET) or Polycarbonate (PC), and the microstructure 2 may be formed by transfer printing on the substrate 1. During the transfer process, the microstructures 2 are cured using ultraviolet irradiation. Before the microstructure 2 is not completely cured, the diffusion particles 3 are attached to the surface of the microstructure 2 by spraying or spin coating to form a concave surface 2b, and then the microstructure is cured and molded. Thereby bonding the diffusion particles 3 to the microstructure 2. The shape of the microstructures 2 and the diffusion particles 3 can also be set by metal micro-engraving. Taking a micro-engraved copper wheel as an example, the shape of the micro-engraved copper wheel is designed in advance in a simulated manner, and the microstructure 2 and the diffusion particles 3 are primarily transferred onto the substrate 1 through micro-engraving transfer printing, so that the preparation of the optical membrane 10 is completed.
It should be noted that, the diffusion particles 3 are attached to the surface of the microstructure 2, and the density, the particle size ratio and the arrangement of the diffusion particles 3 are advantageously tested and adjusted by using a metal micro-engraving transfer printing or spraying or spin coating manner.
Optionally, when the microstructure 2 is prepared by using a press-fit extrusion process, the substrate 1 and the microstructure 2 are press-fit and extruded at one time, that is, the substrate 1 and the microstructure 2 are integrally prepared.
Referring to fig. 2, in some embodiments of the present disclosure, the optical film 10 may further include a colloid 4. The diffusion particles 3 are doped in the colloid 4, and the colloid 4 is disposed in the concave groove 2a.
It is easily understood that the gel 4 can be bonded in the concave groove 2a. The diffusion particles 3 can be fixed in the concave groove 2a by doping the diffusion particles 3 in the colloid 4. That is, the colloid 4 can bind the diffusion particles 3 in the concave groove 2a. Similarly, the surface of the diffusion particle 3 in contact with the colloid 4 has a concave-convex shape. The light passing through the microstructure 2 irradiates the surface of the diffusion particle 3 or the surface of the diffusion particle 3 contacting with the colloid 4, and the light is scattered to different directions and penetrates through the diffusion particle 3 to form diffuse transmission, so that the brightness uniformity of the light in all directions is further improved.
In the present embodiment, the particle diameter of the diffusion particles 3 is smaller than the depth of the concave groove 2a. The height of the optional diffusing particles 3 is less than or equal to the height of the microstructure 2, based on the substrate 1.
Specifically, when the particle diameter of the diffusion particles 3 is smaller than the depth of the concave groove 2a with respect to the substrate 1, the diffusion particles 3 can be completely accommodated in the concave groove 2a. The height of any diffusion particle 3 in the concave groove 2a does not exceed the height of the microstructure 2, that is, the height of any diffusion particle 3 is less than or equal to the height of the microstructure 2. In order to achieve that the height of any diffusion particle 3 is less than or equal to the height of the microstructure 2, the particle diameter of the diffusion particle 3 should be less than the depth of the concave groove 2a.
Specifically, the height of the microstructure 2 is 20 to 50 micrometers. For example, the height of the microstructures 2 may be 20 micrometers, 30 micrometers, 50 micrometers. It is understood that when the height of the microstructures 2 is 20 micrometers, the particle diameter of the diffusion particles 3 is less than 20 micrometers. When the height of the microstructure 2 is 30 micrometers, the particle diameter of the diffusion particle 3 is less than 30 micrometers.
It is easily understood that if the height of any diffusion particle 3 exceeds the height of the microstructure 2 based on the substrate 1, the thickness of the optical film 10 is the thickness from the substrate 1 to the highest point of the diffusion particle 3. When the height of any diffusion particle 3 is less than or equal to the height of the microstructure 2, the thickness of the optical film 10 is the sum of the thickness of the substrate 1 and the height of the microstructure 2. That is, when the height of any diffusion particle 3 is less than or equal to the height of the microstructure 2, it is advantageous to thin the optical film 10.
Referring to fig. 3, in the present embodiment, the plurality of diffusion particles 3 have different particle sizes.
Alternatively, the plurality of diffusion particles 3 may have particle diameters of 5 micrometers, 10 micrometers, and 20 micrometers, respectively.
It is easy to understand that the particle diameters of the plurality of diffusion particles 3 are different, and the exit angles of the light rays dispersed after being irradiated onto the surfaces of the diffusion particles 3 are different. That is to say, the light passes through a plurality of diffusion particles 3 with different particle sizes, the angle of emergent light is more, that is, the scattering of light is more uniform, and the brightness of light emergent on the whole is more uniform.
Alternatively, the plurality of diffusion particles 3 includes first particles 3a and second particles 3b. The first particles 3a have a larger particle diameter than the second particles 3b. The ratio of the number of the first particles 3a to the number of the second particles 3b is less than 1.
Optionally, the first particles 3a have a particle size of 10 to 50 micrometers, and the second particles 3b have a particle size of 10 micrometers or less. The ratio of the number of first particles 3a to the number of second particles 3b may be 1.
It is easily understood that the number of the second particles 3b having a smaller particle diameter is larger, and the number of the diffusion particles 3 which can be accommodated in the concave groove 2a is larger. The light can be easily irradiated on the surface of the diffusion particle 3 to be scattered, so that the light can be scattered more fully, and the irradiation brightness of the light is more uniform. Second, the second particles 3b having a smaller particle size are more numerous, and the concave surfaces 2b formed by contact with the surface of the microstructure 2 or the colloid 4 are more numerous. I.e. the interface contacting with the diffusion particles 3 is rougher, which is beneficial to the diffuse transmission of light and further makes the scattering of light more sufficient.
Optionally, in the recessed groove 2a of the microstructure 2, the first particles 3a are disposed on the surface of the microstructure 2 close to the substrate 1, and the second particles 3b are disposed on the inner surface of the microstructure 2 far from the substrate 1. In other words, the diffusion particles 3 having a larger particle diameter are provided on the inner surface of the concave groove 2a close to the base 1, and the diffusion particles 3 having a smaller particle diameter are provided on the inner surface of the concave groove 2a far from the base 1.
Such arrangement of the diffusion particles 3 makes it possible to dispose the first particles 3a having a larger particle diameter deeper in the concave groove 2a. Meanwhile, the second particles 3b having a smaller particle diameter may be provided on the surface of the concave groove 2a away from the substrate 1. Thus, the height of the first particles 3a from the substrate 1 is low, and the height of the second particles 3b is not easy to exceed the height of the microstructure 2. It is advantageous to reduce the thickness of the optical film 10.
Optionally, referring to fig. 4, in the concave groove 2a of the microstructure 2, the second particles 3b, the first particles 3a, and the second particles 3b are sequentially arranged from the surface of the microstructure 2 close to the substrate 1 to the surface of the microstructure 2 far from the substrate 1. That is, the diffusion particles 3 are arranged so that the particle diameters thereof are small, large, and small from the surface of the microstructure 2 close to the substrate 1 to the surface of the microstructure 2 far from the substrate 1.
The diffusion particles 3 are arranged at intervals of small, large and small particle sizes, so that the light scattering effect is better and more uniform.
Alternatively, the material forming the microstructures 2 may also contain diffusion particles 3. The diffusion particles 3 are arranged in the formed microstructure 2 and on the surface of the microstructure, so that the uniformity of light emission is further improved.
Alternatively, in the present embodiment, the refractive index of the diffusion particles 3 is the same as the refractive index of the microstructures 2.
It is understood that when the refractive index of the diffusion particles 3 is the same as that of the microstructures 2, light is not refracted at the interface where the diffusion particles 3 and the microstructures 2 are in contact. Thereby, light loss due to light refraction can be reduced.
Alternatively, the refractive index of the diffusion particles 3 is different from the refractive index of the microstructures 2.
Specifically, when the refractive index of the diffusion particles 3 is different from the refractive index of the microstructure 2, light is refracted through the surface of the diffusion particles 3 in contact with the microstructure 2. The refraction effect is increased, so that the emergent angle and the emergent direction of the light rays are increased, and the light-equalizing effect is further improved.
Optionally, the difference between the refractive index of the diffusion particles 3 and the refractive index of the microstructure 2 is less than 0.05.
Specifically, if the difference between the refractive index of the diffusion particles 3 and the refractive index of the microstructure 2 is too large, the angle at which light is refracted through the interface where the diffusion particles 3 and the microstructure 2 are in contact is large. The light refraction angle is too large, so that part of light is emitted towards the non-light-emitting direction of the backlight module, and the light-emitting brightness of the backlight module is obviously reduced. For example, to the side of the backlight module and the light incident side. So that the light received by the light-emitting side of the backlight module is reduced and light loss is formed. When the difference between the refractive index of the diffusion particles 3 and the refractive index of the microstructure 2 is less than 0.05, the light loss caused by refraction can be effectively reduced, the emergent angle and the emergent direction of the light are increased, and the emergent uniformity of the light is further improved.
Optionally, referring to fig. 5, the plurality of diffusion particles 3 include first particles 3a and second particles 3b, and a refractive index of the first particles 3a is different from a refractive index of the second particles 3b.
It is easily understood that the diffusion particles 3 are not identical in refractive index to the microstructures 2. Further, the refractive indices of the first particles 3a and the second particles 3b are different. When the light rays of the same angle are irradiated to the first particles 3a and the second particles 3b, the angles at which the light rays are refracted are different. The refraction angle of the light is more, the emergent angle and the emergent direction of the light are further increased, and the light uniformity is improved.
Alternatively, the diffusion particles 3 may be prepared by using materials having different refractive indexes such that the refractive indexes of the first particles 3a and the second particles 3b are different. Or by forming different polymerization degrees using the same polymer material so that the diffusion particles 3 have at least two different refractive indices.
Referring to fig. 6 and 7, in the embodiment of the present application, the microstructure 2 includes a plurality of sub-portions 2p, and the sub-portions 2p are sequentially connected end to end along a circumferential direction to form a closed structure; in the microstructure 2, the width of the sub-portion 2p decreases in a direction from the side close to the substrate 1 to the side away from the substrate 1.
Optionally, the number of subsections 2p is 2, 4 or 8.
It is easily understood that, in the microstructure 2, the width of the sub-portion 2p decreases from the side close to the substrate 1 to the side away from the substrate 1. The side of the microstructure 2 facing away from the substrate 1 forms a surface structure with a plurality of flat or at least one curved surface. Incident light is dispersed into a plurality of outgoing light rays of different angles by multiple refractions of the surface of the microstructure 2.
In addition, since the width of the sub-portion 2p decreases from the side close to the substrate 1 to the side far from the substrate 1, the surface of the microstructure 2 encloses to form the concave groove 2a. The diffusion particles 3 may be disposed in the concave groove 2a.
Alternatively, the shape of the concave groove 2a may be an inverted quadrangular pyramid shape, an inverted triangular pyramid shape, or an inverted cone shape. It is easily understood that the light rays are refracted in the microstructures 2 at different times and angles according to the surface structure of the microstructures 2.
Here, the term "light splitting" refers to dispersing light. I.e. the light is refracted out of a plurality of light rays without changing the wavelength of the light.
Optionally, the surface of the substrate 1 away from the microstructure 2 may be a smooth surface or a rough matte surface, and the same microstructure 2 may also be provided. This application does not limit this, can see through light can.
Referring to fig. 8, an embodiment of the present invention further provides a backlight module 100, which includes a light-emitting substrate 20 and the optical film 10 disposed on the light-emitting substrate 20.
The backlight module 100 includes the optical film 10, so that light splitting and scattering of a light source can be realized, and light emitting uniformity of the backlight module 100 can be improved.
Alternatively, the light emitting substrate 20 may be an LED substrate or a Mini-LED substrate. The height, width and surface shape of the microstructures 2 in the optical film 10 depend on the distribution pitch of the lamps in the LED substrate/Mini-LED substrate.
The optical film and the backlight module provided by the present application are described in detail above.
In the optical film and the backlight module provided by the embodiment of the application, the optical film comprises a substrate, a plurality of microstructures and a plurality of diffusion particles. The plurality of microstructures are arranged on the substrate, and one side of each microstructure, which is far away from the substrate, is provided with a concave groove. A plurality of diffusion particles are disposed in the recess groove. The microstructure is used for dividing incident light into a plurality of emergent light beams.
In the optical film and the backlight module provided by the embodiment of the application, the optical film comprises a microstructure provided with a concave groove, and incident light is divided into a plurality of beams of emergent light, so that the light is uniformly emergent, and the light emergent uniformity is improved. And then the diffusion particles are arranged in the concave grooves of the microstructure, and the light rays passing through the microstructure irradiate the surfaces of the diffusion particles. Part of the light forms diffuse transmission on the surface of the diffusion particles, and the scattering effect is achieved. Part of the light forms diffuse reflection on the surface of the diffusion particles, and the reflection effect is realized. And because the microstructure is provided with the concave groove, the diffusion particles are arranged in the concave groove, and the thickness of the optical film is reduced. Because the optical film can realize the functions of light splitting and scattering at the same time, the problem of overlarge film thickness caused by the overlapping use of multiple layers of optical films is avoided.
The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principle of the present application, the present application can also make several improvements and modifications, and those improvements and modifications also fall into the protection scope of the claims of the present application.
Claims (10)
1. An optical film, comprising:
a substrate;
the microstructures are arranged on the substrate, and one side of each microstructure, which is far away from the substrate, is provided with a concave groove; the microstructure is used for dividing incident light into a plurality of emergent light beams;
a plurality of diffusion particles disposed within the recessed trench.
2. The optical film according to claim 1, wherein the surface of the microstructure remote from the substrate has a concave surface; the diffusion particles are attached to the concave surface.
3. The optical film according to claim 1, further comprising a colloid, wherein the diffusion particles are doped in the colloid, and the colloid is disposed in the recess.
4. The optical film according to claim 1, wherein the diffusion particles have a particle size smaller than the depth of the concave groove; the height of any of the diffusion particles is less than or equal to the height of the microstructure, based on the substrate.
5. The optical film according to claim 1, wherein a plurality of the diffusion particles are different in particle size.
6. The optical film according to claim 5, wherein the plurality of diffusion particles include first particles and second particles, a particle size of the first particles is larger than a particle size of the second particles, and a ratio of the number of the first particles to the number of the second particles is smaller than 1.
7. The optical film of claim 1 wherein the diffusing particles have a refractive index that is different from the refractive index of the microstructures.
8. The optical film according to claim 7, wherein the plurality of diffusion particles include first particles and second particles, and a refractive index of the first particles is different from a refractive index of the second particles.
9. The optical film according to claim 1, wherein the microstructure comprises a plurality of sub-portions, and the plurality of sub-portions are sequentially connected end to end along a circumferential direction to form a closed structure; in the microstructure, the width of the sub-portion decreases in a direction from a side close to the substrate to a side far from the substrate.
10. A backlight module comprising a light-emitting substrate and the optical film of claims 1-9 disposed on the light-emitting substrate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211274586.1A CN115712213A (en) | 2022-10-18 | 2022-10-18 | Optical diaphragm and backlight module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211274586.1A CN115712213A (en) | 2022-10-18 | 2022-10-18 | Optical diaphragm and backlight module |
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| CN115712213A true CN115712213A (en) | 2023-02-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116106999A (en) * | 2023-04-13 | 2023-05-12 | Tcl华星光电技术有限公司 | Light diffusion film and polarizer |
| US12032244B1 (en) | 2023-04-13 | 2024-07-09 | Tcl China Star Optoelectronics Technology Co., Ltd. | Light diffusion film, polarizer, and liquid crystal display device |
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| KR100793091B1 (en) * | 2006-11-24 | 2008-01-10 | 엘지전자 주식회사 | A brightness improving sheet and a backlight unit including the same |
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| CN215180976U (en) * | 2021-04-23 | 2021-12-14 | 合肥京东方显示技术有限公司 | Scattering film, display module and display device |
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| CN116106999B (en) * | 2023-04-13 | 2023-08-22 | Tcl华星光电技术有限公司 | Light diffusion film and polarizer |
| US12032244B1 (en) | 2023-04-13 | 2024-07-09 | Tcl China Star Optoelectronics Technology Co., Ltd. | Light diffusion film, polarizer, and liquid crystal display device |
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