Light homogenizing plate and manufacturing method therefor, backlight module, display panel, and display device

Abstract

The present application discloses a light homogenizing plate and a manufacturing method therefor, a backlight module, a display panel, and a display device. The light homogenizing plate is applied to the backlight module. The light homogenizing plate comprises a base material. The base material comprises a first part and a second part which are arranged opposite to each other in a thickness direction. A diffusion structure is provided inside the first part, and the diffusion structure is configured to diffuse incident light. A color conversion structure is provided inside the second part, and the color conversion structure is configured to be excited by light of a preset color so as to emit light of a color different from the preset color.

Description

Light-diffusing plate and preparation method thereof, backlight module, display panel and display device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 8, 2023, with application number 202311165854.0 and application name “Light-uniform plate and preparation method thereof, backlight module, display panel and display device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of display technology, and in particular relates to a light-diffusing plate and a preparation method thereof, a backlight module, a display panel, and a display device. Background Art

[0003] The backlight module is one of the key components of the display panel, used to illuminate the display panel so that it can display images normally.

[0004] In related technologies, a backlight module generally includes a back panel, a light emitting device and multiple optical films, which are respectively mounted on the back panel, so that the light emitted by the light emitting device is optically transformed by the multiple optical films to obtain a light source with uniform brightness. Technical issues

[0005] However, during the operation of the backlight module, the high temperature generated by the light-emitting device may easily interfere with the optical film, thereby affecting the display effect of the display panel.

[0006] Therefore, the existing technology needs to be improved and enhanced. Technical Solutions

[0007] The embodiments of the present application provide a light diffuser and a method for manufacturing the same, a backlight module, a display panel, and a display device, which can improve the reliability of the backlight module to ensure the display effect of the display panel.

[0008] In the first aspect, an embodiment of the present application provides a light-diffusing plate, which is applied to a backlight module and includes a substrate. The substrate includes a first part and a second part arranged opposite to each other along the thickness direction. A diffusion structure is provided inside the first part, and the diffusion structure is used to diffuse the incident light. A color conversion structure is provided inside the second part, and the color conversion structure is used to be excited by light of a preset color to emit light of a color different from the preset color.

[0009] Optionally, the color conversion structure includes quantum dots and / or fluorescent materials.

[0010] Optionally, a brightness enhancement structure is provided on a side of the substrate facing away from the first portion.

[0011] Optionally, the brightness enhancement structure includes an optical microstructure integrally formed on the substrate; and / or

[0012] The brightness enhancement structure includes a brightness enhancement film.

[0013] Optionally, a diffusion layer is provided on a side of the brightness enhancement structure facing away from the first portion.

[0014] Optionally, the diffusion layer includes a diffusion ink layer, and the diffusion ink layer is adhered to a surface of the substrate facing away from the first portion.

[0015] Optionally, the thickness of the diffusion ink layer is less than or equal to 100 microns.

[0016] In a second aspect, an embodiment of the present application further provides a method for preparing a light diffuser, wherein the light diffuser is applied to a backlight module, and the preparation method comprises the following steps:

[0017] Prepare a first substrate, wherein the first substrate is provided with one of a diffusion structure and a color conversion structure, wherein the diffusion structure is used to diffuse incident light, and the color conversion structure is used to be excited by light of a preset color to mix and form white light;

[0018] disposing the other of the diffusion structure and the color conversion structure on a first side of the first substrate in a thickness direction;

[0019] Disposing a semi-solid second substrate on the first side of the first substrate to cover the diffusion structure or the color conversion structure on the first side of the first substrate, wherein the second substrate is made of the same material as the first substrate;

[0020] The second substrate is cured so that the second substrate and the first substrate are fused to form an integrally formed target substrate.

[0021] Optionally, before curing the second substrate, the first substrate is in a semi-solid state;

[0022] The step of curing the second substrate so that the second substrate and the first substrate are fused to form an integrally formed target substrate includes:

[0023] The first substrate and the second substrate are cured simultaneously, so that the second substrate and the first substrate are fused to form an integrally formed target substrate.

[0024] Optionally, disposing the other of the diffusion structure and the color conversion structure on the first side of the first substrate in the thickness direction includes: forming a groove by embossing on the first side of the first substrate; and disposing quantum dots and / or fluorescent materials in the groove;

[0025] The step of disposing a semi-solid second substrate on the first side of the first substrate includes: sealing the quantum dots and / or fluorescent material in the groove via the second substrate.

[0026] Optionally, after curing the second substrate, the preparation method further comprises:

[0027] A brightness enhancement structure is formed by embossing a surface of one side of the target substrate formed by the second substrate.

[0028] Optionally, after the brightness enhancement structure is formed by embossing the surface of one side of the target substrate formed by the second substrate, the preparation method further comprises:

[0029] A diffusion ink layer is provided on the surface of the brightness enhancement structure.

[0030] In a third aspect, an embodiment of the present application further provides a method for preparing a light diffuser, wherein the light diffuser is applied to a backlight module, and the preparation method comprises the following steps:

[0031] Prepare a semi-solid first substrate, wherein the first substrate is provided with one of a diffusion structure and a color conversion structure, wherein the diffusion structure is used to diffuse incident light, and the color conversion structure is used to be excited by light of a preset color to mix and form white light;

[0032] Disposing a semi-solid second substrate on a first side of the first substrate in a thickness direction, the second substrate being made of the same material as the first substrate, and having the other of the diffusion structure and the color conversion structure disposed therein;

[0033] The first substrate and the second substrate are cured so that the first substrate and the second substrate are fused to form an integrally formed target substrate.

[0034] Optionally, after curing the second substrate, the preparation method further comprises:

[0035] A brightness enhancement structure is formed by embossing a surface of one side of the target substrate formed by the second substrate.

[0036] Optionally, after the brightness enhancement structure is formed by embossing the surface of one side of the target substrate formed by the second substrate, the preparation method further comprises:

[0037] A diffusion ink layer is provided on the surface of the brightness enhancement structure.

[0038] In a fourth aspect, an embodiment of the present application also provides a backlight module, including a light diffuser; the light diffuser includes a substrate, the substrate includes a first part and a second part arranged opposite to each other along the thickness direction, a diffusion structure is provided inside the first part, the diffusion structure is used to diffuse the incident light, and a color conversion structure is provided inside the second part, the color conversion structure is used to be excited by light of a preset color to emit light of a color different from the preset color.

[0039] Optionally, the color conversion structure includes quantum dots and / or fluorescent materials.

[0040] Optionally, a brightness enhancement structure is provided on a side of the substrate facing away from the first portion.

[0041] In a fifth aspect, an embodiment of the present application further provides a display panel comprising the backlight module as described above.

[0042] In a sixth aspect, an embodiment of the present application further provides a display device, comprising the display panel as described above and a housing that supports the display panel. Beneficial effects

[0043] In the embodiment of the present application, it can be understood that a single substrate simultaneously performs both the diffusion and color conversion functions, thereby allowing the use of a single substrate to replace both the diffusion film and the color conversion film. Consequently, during operation of the backlight module, the diffusion film and the color conversion film will not warp, separate, or even fall off due to inconsistent shrinkage rates. This demonstrates that the diffuser plate of the embodiment of the present application is stable and reliable, thereby ensuring the display quality of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and beneficial effects of the present application apparent.

[0045] FIG1 is a schematic diagram of a first structure of a light diffuser provided in an embodiment of the present application.

[0046] FIG2 is a schematic diagram of a structure of the light dodging plate shown in FIG1 after a brightness enhancement structure is provided.

[0047] FIG3 is a schematic structural diagram of the light dodging plate shown in FIG2 after a diffusion layer is provided.

[0048] FIG4 is a schematic structural diagram of the light dodging plate shown in FIG1 after a diffusion layer is provided.

[0049] FIG5 is a schematic structural diagram of a backlight module provided in an embodiment of the present application.

[0050] FIG6 is a schematic diagram of a first method for preparing a light diffuser provided in an embodiment of the present application.

[0051] FIG7 is a flow chart of the preparation method shown in FIG6 .

[0052] FIG8 is a schematic diagram of a second method for preparing a light diffuser provided in an embodiment of the present application.

[0053] FIG9 is a flow chart of the preparation method shown in FIG8 .

[0054] The numbers in the figure are:

[0055] 100. Base material;

[0056] S1, first part; S2, second part; 11, brightening structure;

[0057] 200, diffusion structure;

[0058] 300, color conversion structure;

[0059] 400, diffusion layer;

[0060] 500. Light-emitting unit. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0062] The backlight module is one of the key components of the display panel, used to illuminate the display panel so that it can display images normally.

[0063] In related art, a backlight module typically includes a backplane, light-emitting devices, and multiple optical films. The light-emitting devices and the multiple optical films are separately mounted on the backplane. This optical film optically modulates the light emitted by the light-emitting devices to produce a uniformly bright light source. However, during backlight module operation, the high temperatures generated by the light-emitting devices can easily interfere with the optical films, thereby affecting the display quality of the display panel.

[0064] Specifically, when the light-emitting device of the backlight module heats up, the shrinkage rates of different diaphragms are different. Therefore, the deformation amplitudes of different diaphragms due to thermal expansion and contraction are inconsistent, which may cause one diaphragm to partially warp relative to another diaphragm. To this end, the related art combines multiple diaphragms into a composite film and finds ways to improve the reliability of the connection between the different layers of the composite film. However, when the light-emitting device of the backlight module heats up, local warping, separation, and detachment between the different optical film layers are still inevitable, thereby affecting the display effect of the display panel.

[0065] Based on this, an embodiment of the present application provides a light diffuser, which is used in a backlight module to improve the reliability of the backlight module, thereby ensuring the display effect of the display panel.

[0066] Please refer to Figure 1, which is a schematic diagram of the first structural embodiment of a light diffuser provided in an embodiment of the present application. The light diffuser comprises a substrate 100, which comprises a first portion S1 and a second portion S2 arranged opposite each other along the thickness direction. A diffusion structure 200 is disposed within the first portion S1 to diffuse incident light. A color conversion structure 300 is disposed within the second portion S2 to be excited by light of a predetermined color and to emit light of a different color than the predetermined color.

[0067] For example, when the thickness of the substrate 100 is vertical, the lower half of the substrate 100 can be the first portion S1, and the upper half can be the second portion S2. The diffuser structure 200 of the light diffuser is built into the lower half of the substrate, i.e., the first portion S1, and the color conversion structure 300 of the light diffuser is built into the upper half of the substrate, i.e., the second portion S2. When the backlight module is operating, the light source of the backlight module can emit light from below the light diffuser, so that the light emitted by the light source enters the first portion S1 from below, diffuses through the back diffuser structure 200, and then excites the color conversion structure 300.

[0068] In the embodiment of the present application, it can be understood that a single substrate 100 simultaneously performs both diffusion and color conversion functions, thereby allowing the single substrate 100 to replace two optical films: a diffusion film or a diffusion plate and a color conversion film. Consequently, during operation of the backlight module, the diffusion film or the diffusion plate and the color conversion film will not warp, separate, or even fall off due to inconsistent shrinkage rates. This shows that the diffuser plate of the embodiment of the present application is stable and reliable, thereby ensuring the display quality of the display panel.

[0069] Specifically, the substrate 100 is a single-layer plate structure.

[0070] In some embodiments, the substrate 100 may be PMMA (methyl methacrylate), PS (general purpose polystyrene), MS (styrene-methyl methacrylate copolymer), or PC (Polycarbonate), which is not limited in the present embodiment.

[0071] In some embodiments, the diffusion structure 200 may include at least one of diffusion particles and foam particles. In other words, the diffusion structure 200 may include only diffusion particles distributed within the first portion S1, only foam particles distributed within the first portion S1, or both diffusion particles and foam particles distributed within the first portion S1. This is not limited in this embodiment of the present application.

[0072] Among them, the diffusion particles and foaming particles are nano / micro particles, which have a good scattering effect on light and can effectively scatter and disperse incident light sources at various angles, thereby achieving a diffusion effect on light to form a uniform distribution of light.

[0073] It is also understandable that the diffusion structures 200 may be uniformly distributed in the first portion S1 . The diffusion structures 200 may also be unevenly distributed in the first portion S1 , which is not limited in the embodiment of the present application.

[0074] In some embodiments, the color conversion structure 300 may include at least one of quantum dots and a fluorescent material. Specifically, the color conversion structure 300 may include only quantum dots disposed within the second portion S2, only fluorescent materials disposed within the second portion S2, or both quantum dots and fluorescent materials disposed within the second portion S2. This is not limited in this embodiment of the present application.

[0075] The color conversion structure 300 can be used to be excited by light of a preset color to mix and form white light.

[0076] For example, the color conversion structure 300 can be configured to be excited by light of a preset color to emit light of a different color from the preset color, thereby mixing to form white light. For example, blue light and green light can be simultaneously directed toward the light diffuser, with the blue light being the preset color. The color conversion structure 300, upon being excited by the blue light, emits red light, thereby forming white light from the mixture of the blue, green, and red lights.

[0077] Optionally, the color conversion structure 300 can be configured to be excited by light of a preset color to emit two different colors of light, which can then be mixed to form white light. For example, blue light can be directed toward the light diffuser, and the blue light is the preset color. When excited by the blue light, part of the color conversion structure 300 emits green light, while another part of the color conversion structure 300 emits red light. Thus, the blue, green, and red light mix to form white light.

[0078] In the following, the color conversion structure 300 including quantum dots and fluorescent materials is used as an example for illustration.

[0079] Taking the color conversion structure 300 including quantum dots as an example, the second portion S2 may be provided with a relatively large cavity, in which a quantum dot film is placed; alternatively, the second portion S2 may be provided with a plurality of micropores, in each of which a quantum dot particle is placed, and this embodiment of the present application is not limited thereto.

[0080] The quantum dots may include at least one of red quantum dots and green quantum dots, wherein the red quantum dots are quantum dots that emit red light when excited, and the green quantum dots are quantum dots that emit green light when excited.

[0081] For example, quantum dots can include red quantum dots and green quantum dots at the same time, that is, the color conversion structure 300 includes red quantum dots and green quantum dots. Then the light source of the backlight module can be used to emit blue light, so that the blue light emitted by the light source is diffused by the diffusion structure 200 and evenly emitted to the red quantum dots and green quantum dots, so that the red quantum dots and green quantum dots are excited to emit red light and green light respectively, so that the blue light emitted by the light source, the red light emitted by the red quantum dots and the green light emitted by the green quantum dots can be mixed to form uniform white light to light up the entire display panel.

[0082] Alternatively, the quantum dots may include only red quantum dots, and the light source may include a green light chip for emitting green light and a blue light chip for emitting blue light. Alternatively, the quantum dots may include only green quantum dots, and the light source may include a red light chip for emitting red light and a blue light chip for emitting blue light. This embodiment of the present application is not limited to this.

[0083] Taking the color conversion structure 300 including a fluorescent material as an example, the second portion S2 may be provided with a relatively large cavity, in which a fluorescent film is placed; alternatively, the second portion S2 may be provided with a plurality of micro-holes, in which each micro-hole is provided with a fluorescent particle, which is not limited in the embodiments of the present application.

[0084] The fluorescent material may include KSF (fluoride phosphor) and / or YAG (rare earth yttrium aluminum garnet) and other fluorescent substances. Accordingly, the light source of the backlight module is a blue light chip. The blue light emitted by the light source is diffused by the diffusion structure 200 and evenly directed toward the fluorescent material, stimulating it to emit red and green light. Finally, the blue light is directly mixed with the red and green light to form white light.

[0085] Please continue to refer to Figure 2, which is a schematic diagram of a structure in which the light diffuser shown in Figure 1 is provided with a brightness enhancement structure. In some embodiments, the side of the substrate 100 facing away from the first portion S1 is provided with a brightness enhancement structure 11. Of course, continuing with the above example where the first portion S1 is the lower half of the substrate 100 and the second portion S2 is the upper half of the substrate 100, it can also be understood that the brightness enhancement structure 11 is provided on the upper surface of the substrate 100.

[0086] Specifically, the brightness enhancement structure 11 is used to refract the light emitted from the second portion S2 , thereby utilizing the law of refraction to narrow the angle of the emitted light and focus the light on the front viewing surface, thereby increasing the front viewing angle brightness of the backlight module and ultimately achieving a brightness enhancement effect.

[0087] Exemplarily, the brightness enhancement structure 11 may include an optical microstructure integrally formed on the substrate 100. Then, it can also be understood that the substrate 100 simultaneously has the three functions of diffusion, color conversion and brightness enhancement, so that the three optical films of the diffusion film, the color conversion film and the brightness enhancement film can be replaced by one substrate 100. Then, during the operation of the backlight module, there will be no situation where the diffusion film, the color conversion film and the brightness enhancement film are warped, separated or even fall off due to inconsistent shrinkage rates. It can be seen that the light-diffusing plate of the embodiment of the present application has the advantages of stability and reliability, thereby ensuring the display effect of the display panel.

[0088] For example, the brightness enhancement structure 11 may include a prism, a truncated pyramid, a frustum, a cylinder, etc. integrally formed on the substrate 100, which is not limited in the embodiment of the present application.

[0089] Of course, in some other embodiments, the brightness enhancement structure 11 also includes a brightness enhancement film. When the brightness enhancement structure 11 includes a brightness enhancement film, the brightness enhancement film can be attached to the surface of the substrate 100 facing away from the first portion S1, so that the brightness enhancement film adheres to the substrate 100, thereby reducing the probability of film shrinkage, floating, or film separation between the substrate 100 and the brightness enhancement film.

[0090] Specifically, the brightness enhancement structure 11 may include only the aforementioned optical microstructure, only the aforementioned brightness enhancement film, or both the aforementioned optical microstructure and the brightness enhancement film. For example, the optical microstructure may be provided on the surface of the substrate 100 facing away from the first portion S1, and the brightness enhancement film may be attached to the optical microstructure. This dual brightness enhancement structure significantly improves the brightness of the front-view surface of the backlight module.

[0091] Please continue to refer to Figure 3, which is a schematic diagram of a structure in which a diffusion layer is provided on the light diffuser shown in Figure 2. In some embodiments, a diffusion layer 400 may be provided on the side of the substrate 100 facing away from the first portion S1 to atomize the light from the backlight module, focusing the brightened light on the front surface and improving the shielding effect of the backlight module.

[0092] For example, continuing with the above-mentioned case where the brightness enhancement structure 11 is provided on the side of the substrate 100 facing away from the first portion S1, a diffusion layer 400 may be provided on the side of the brightness enhancement structure 11 facing away from the first portion S1. The diffusion layer 400 can refract and reflect the enhanced light, thereby atomizing the light from the backlight module and concentrating the enhanced light toward the front, thereby improving the shielding effect of the backlight module.

[0093] For example, the diffusion layer 400 may include a diffusion ink layer. The diffusion ink layer is attached to the surface of the substrate 100 facing away from the first portion S1, so that the diffusion ink can further scatter and even the light, and the final emitted light has a good shielding effect and a relatively uniform optical effect.

[0094] Therefore, it can also be understood that the substrate 100 simultaneously performs the four functions of diffusion, color conversion, brightness enhancement, and light shielding, so that the four optical films of the first diffusion film, color conversion film, brightness enhancement film, and second diffusion film can be replaced by a single substrate 100. Then, during the operation of the backlight module, the first diffusion film, color conversion film, brightness enhancement film, and second diffusion film will not warp, separate, or even fall off due to inconsistent shrinkage rates. Therefore, it can be seen that the light diffuser of the embodiment of the present application has the advantages of stability and reliability, thereby ensuring the display effect of the display panel.

[0095] Of course, please continue to refer to Figure 4, which is a schematic diagram of a structure of the light diffuser shown in Figure 1 after the diffusion layer is provided. In some embodiments, the light diffuser can also be provided with a diffusion layer 400, such as a diffusion ink layer, instead of the aforementioned brightness enhancement structure 11. The diffusion ink layer is attached to the side of the substrate 100 facing away from the diffusion structure 200. This embodiment of the present application is not limited to this.

[0096] In some embodiments, the thickness of the diffusion ink layer is less than or equal to 100 microns. Thus, by controlling the thickness of the diffusion ink layer, the light diffuser can be made thinner and lighter, and the diameter of the diffusion ink particles formed by the diffusion ink layer can be made smaller, thereby improving the light diffusion effect.

[0097] For example, the thickness of the diffusion ink layer can be 100 microns, 94.2 microns, 83 microns, 78.1 microns, 71 microns, 65 microns, 57 microns, 52.2 microns, 43.8 microns, 39.9 microns, 35 microns, 30 microns, 24.5 microns, 22 microns, 20.4 microns, 15 microns, 9 microns or 3 microns, etc., and the embodiments of the present application are not limited to this.

[0098] The above are some examples of light diffusers in the embodiments of the present application.

[0099] The embodiment of the present application further provides a backlight module, which may be provided with the above-mentioned light diffuser.

[0100] In some embodiments, the backlight module may be an edge-type backlight module or a direct-type backlight module, which is not limited in the embodiments of the present application.

[0101] In some embodiments, the backlight module is a Mini LED (sub-millimeter light-emitting diode) backlight module or a Micro LED (micrometer light-emitting diode) backlight module, which is not limited in the embodiments of the present application.

[0102] Specifically, please continue to refer to Figure 5, which is a schematic structural diagram of the backlight module provided in an embodiment of the present application. The backlight module can be provided with a light-emitting unit 500, which is a Mini LED (sub-millimeter light-emitting diode) chip or a Micro LED (micrometer light-emitting diode) chip.

[0103] The embodiment of the present application further provides a display panel, which may include the above-mentioned backlight module. Specifically, the display panel may be a liquid crystal display panel.

[0104] An embodiment of the present application further provides a display device, which includes the above-mentioned display panel and a housing that supports the display panel.

[0105] Specifically, the display device can be any product with a display function, such as a liquid crystal display panel, electronic paper, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc., and the embodiments of the present application are not limited to this.

[0106] Please continue to refer to Figures 6 and 7. Figure 6 is a schematic diagram of the first method for preparing the light diffuser provided in the embodiment of the present application, and Figure 7 is a flow chart of the preparation method shown in Figure 6. The embodiment of the present application also provides a method for preparing the light diffuser, which is used to prepare the light diffuser. The preparation method includes the following steps:

[0107] 101. Prepare a first substrate, wherein the first substrate is provided with one of a diffusion structure and a color conversion structure, wherein the diffusion structure is used to diffuse incident light, and the color conversion structure is used to be excited by light of a preset color to mix and form white light.

[0108] That is to say, the first substrate may be provided with a diffusion structure or a color conversion structure, and this embodiment of the present application does not limit this.

[0109] Specifically, the first substrate may be prepared by a stretching process or extrusion.

[0110] Preparing the first substrate may include: obtaining a first substrate raw material in a molten state, wherein the molten first substrate raw material is doped with diffusion particles or color conversion particles; and forming the molten first substrate raw material into a first substrate through a stretching process, so that the diffusion particles in the first substrate form a diffusion structure, or the color conversion particles in the first substrate form a color conversion structure.

[0111] In some embodiments, the first substrate may be semi-solid.

[0112] It can be understood that the semi-solid state is an intermediate state of transition from a molten state to a solid state, or in other words, the semi-solid state is an incompletely solidified state.

[0113] 102. Dispose the other of a diffusion structure and a color conversion structure on a first side of the first substrate along a thickness direction.

[0114] Providing the other of the diffusion structure and the color conversion structure on the first side of the first substrate along the thickness direction may include: forming a groove by embossing on the first side of the first substrate; and disposing quantum dots and / or fluorescent materials in the groove.

[0115] Thus, the quantum dots and / or fluorescent materials can form a color conversion structure at an accurate position on the substrate.

[0116] 103. Dispose a semi-solid second substrate on the first side of the first substrate to cover the diffusion structure or the color conversion structure located on the first side of the first substrate, wherein the second substrate is made of the same material as the first substrate.

[0117] In some embodiments, disposing a semi-solid second substrate on the first side of the first substrate may include sealing quantum dots and / or fluorescent materials in the grooves via the second substrate. Furthermore, the quantum dots and / or fluorescent materials may form a color conversion structure.

[0118] 104. Curing the second substrate so that the second substrate and the first substrate are fused to form an integrally formed target substrate.

[0119] In some embodiments, curing the second substrate may include: curing the second substrate after natural cooling.

[0120] Optionally, curing the second substrate may further include: curing the second substrate by heating or UV (ultraviolet) light curing, which is not limited in the embodiment of the present application.

[0121] In some embodiments, the first substrate is in a semi-solid state prior to curing the second substrate.

[0122] That is, curing the second substrate so that the second substrate and the first substrate are fused to form an integrally formed target substrate may include: curing the semi-solid state and the first substrate and the second substrate simultaneously so that the second substrate and the first substrate are fused to form an integrally formed target substrate.

[0123] The target substrate thus comprises a first portion and a second portion disposed opposite each other along the thickness direction. The first portion houses the diffusion structure, while the second portion houses the color conversion structure. Furthermore, the portion of the target substrate formed by the first substrate and the portion formed by the second substrate seal the color conversion structure, providing excellent water and oxygen isolation.

[0124] In some embodiments, after curing the second substrate, the preparation method further includes: providing a brightness enhancement structure on a surface of the target substrate formed by the second substrate.

[0125] For example, providing a brightness enhancement structure on one side surface formed by the second substrate in the target substrate may include: embossing the brightness enhancement structure on one side surface formed by the second substrate in the target substrate.

[0126] Specifically, embossing the brightness enhancement structure on one side of the surface formed by the second substrate in the target substrate may include: embossing the surface of the target substrate by an embossing mold or a pressing roller to form the brightness enhancement structure.

[0127] Alternatively, providing a brightness enhancement structure on one side surface formed by the second substrate in the target substrate may include: laminating at least one brightness enhancement film on one side surface formed by the second substrate in the target substrate.

[0128] Alternatively, before curing the second substrate, the preparation method further comprises: embossing an optical microstructure on a surface of the second substrate facing away from the first substrate. Further, after curing the second substrate, the optical microstructure can form a brightness enhancement structure.

[0129] In some embodiments, the preparation method further includes: disposing a diffusion layer on the surface of the brightness enhancement structure.

[0130] For example, providing a diffusion layer on the surface of the brightness enhancement structure may include providing a diffusion ink layer on the surface of the brightness enhancement structure.

[0131] In some embodiments, disposing a diffusion ink layer on the surface of the brightness enhancement structure may include: disposing the diffusion ink layer on the surface of the brightness enhancement structure by spraying or printing.

[0132] Please continue to refer to Figures 8 and 9. Figure 8 is a schematic diagram of a second method for preparing a light diffuser provided in an embodiment of the present application, and Figure 9 is a flow chart of the preparation method shown in Figure 8. This embodiment of the present application also provides a method for preparing a light diffuser, which is used to prepare the above-mentioned light diffuser. The preparation method includes the following steps:

[0133] 201. Prepare a semi-solid first substrate, wherein the first substrate is provided with one of a diffusion structure and a color conversion structure, wherein the diffusion structure is used to diffuse incident light, and the color conversion structure is used to be excited by light of a preset color to mix and form white light.

[0134] That is to say, the first substrate may be provided with a diffusion structure or a color conversion structure, and this embodiment of the present application does not limit this.

[0135] Specifically, the first substrate may be prepared by a stretching process or extrusion.

[0136] Preparing the first substrate may include: obtaining a first substrate raw material in a molten state, wherein the first substrate raw material in the molten state is doped with diffusion particles or color conversion particles; supporting the semi-solid first substrate with the first substrate raw material in the molten state through a stretching process, so that the diffusion particles in the first substrate form a diffusion structure, or the color conversion particles in the first substrate form a color conversion structure.

[0137] It can be understood that the semi-solid state is an intermediate state of transition from a molten state to a solid state, or in other words, the semi-solid state is an incompletely solidified state.

[0138] 202. Dispose a semi-solid second substrate on a first side of the first substrate along the thickness direction. The second substrate is made of the same material as the first substrate, and the other of the diffusion structure and the color conversion structure is disposed in the second substrate.

[0139] In some embodiments, a semi-solid second substrate is disposed on a first side of a first substrate along a thickness direction: a molten second substrate raw material is obtained, wherein the molten second substrate raw material is doped with quantum dots and / or fluorescent materials; and the molten second substrate raw material is coated on the first side of the first substrate along the thickness direction in a semi-solid form.

[0140] 203. Curing the first substrate and the second substrate so that the first substrate and the second substrate are fused to form an integrally formed target substrate.

[0141] In some embodiments, curing the first substrate and the second substrate may include: curing the first substrate and the second substrate after natural cooling.

[0142] Optionally, curing the first substrate and the second substrate may further include: curing the first substrate and the second substrate by heating or UV (ultraviolet) light, which is not limited in the embodiment of the present application.

[0143] The target substrate thus comprises a first portion and a second portion disposed opposite each other along the thickness direction. The first portion houses the diffusion structure, while the second portion houses the color conversion structure. Furthermore, the portion of the target substrate formed by the first substrate and the portion formed by the second substrate seal the color conversion structure, providing excellent water and oxygen isolation.

[0144] In some embodiments, after curing the first substrate and the second substrate, the preparation method further includes: providing a brightness enhancement structure on a surface of the target substrate formed by the second substrate.

[0145] For example, providing a brightness enhancement structure on one side surface formed by the second substrate in the target substrate may include: embossing the brightness enhancement structure on one side surface formed by the second substrate in the target substrate.

[0146] Specifically, embossing the brightness enhancement structure on one side of the surface formed by the second substrate in the target substrate may include: embossing the surface of the target substrate by an embossing mold or a pressing roller to form the brightness enhancement structure.

[0147] Alternatively, providing a brightness enhancement structure on one side surface formed by the second substrate in the target substrate may include: laminating at least one brightness enhancement film on one side surface formed by the second substrate in the target substrate.

[0148] Alternatively, before curing the first substrate and the second substrate, the preparation method further comprises: embossing an optical microstructure on a surface of the second substrate facing away from the first substrate. Further, after curing the second substrate, the optical microstructure can form a brightness enhancement structure.

[0149] In some embodiments, the preparation method further includes: disposing a diffusion layer on the surface of the brightness enhancement structure.

[0150] For example, providing a diffusion layer on the surface of the brightness enhancement structure may include providing a diffusion ink layer on the surface of the brightness enhancement structure.

[0151] In some embodiments, disposing a diffusion ink layer on the surface of the brightness enhancement structure may include: disposing the diffusion ink layer on the surface of the brightness enhancement structure by spraying or printing.

[0152] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0153] The above is a detailed introduction to the light-homogenizing plate and its preparation method, backlight module, display panel and display device provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A light diffuser, applied to a backlight module, wherein: The invention comprises a substrate, wherein the substrate comprises a first part and a second part which are arranged opposite to each other in a thickness direction, wherein a diffusion structure is arranged inside the first part, and the diffusion structure is used to diffuse incident light, and wherein a color conversion structure is arranged inside the second part, and the color conversion structure is used to be excited by light of a preset color to emit light of a color different from the preset color.

2. The light diffuser according to claim 1, wherein: The color conversion structure includes quantum dots and / or fluorescent materials.

3. The light diffuser according to claim 1 or 2, wherein: A brightness enhancement structure is provided on a side of the substrate facing away from the first portion.

4. The light diffuser according to claim 3, wherein: The brightness enhancement structure comprises an optical microstructure integrally formed on the substrate; and / or The brightness enhancement structure includes a brightness enhancement film.

5. The light diffuser according to claim 3, wherein: A diffusion layer is provided on a side of the brightness enhancement structure facing away from the first portion.

6. The light diffuser according to claim 5, wherein: The diffusion layer comprises a diffusion ink layer, and the diffusion ink layer is attached to a surface of the substrate which is away from the first portion.

7. The light diffuser according to claim 6, wherein: The thickness of the diffusion ink layer is less than or equal to 100 micrometers.

8. A method for preparing a light diffuser, wherein the light diffuser is used in a backlight module, wherein: The preparation method comprises the following steps: Prepare a first substrate, wherein the first substrate is provided with one of a diffusion structure and a color conversion structure, wherein the diffusion structure is used to diffuse incident light, and the color conversion structure is used to be excited by light of a preset color to mix and form white light; Disposing the other of the diffusion structure and the color conversion structure on a first side of the first substrate in a thickness direction; A semi-solid second substrate is disposed on the first side of the first substrate to cover the a diffusion structure or a color conversion structure on a first side of a substrate, wherein the second substrate is made of the same material as the first substrate; The second substrate is cured so that the second substrate and the first substrate are fused to form an integrally formed target substrate.

9. The method for preparing a light diffuser according to claim 8, wherein: Before curing the second substrate, the first substrate is in a semi-solid state; The step of curing the second substrate so that the second substrate and the first substrate are fused to form an integrally formed target substrate includes: The first substrate and the second substrate are cured simultaneously, so that the second substrate and the first substrate are fused to form an integrally formed target substrate.

10. The method for preparing a light diffuser according to claim 8, wherein: The step of arranging the other of the diffusion structure and the color conversion structure on the first side of the first substrate in the thickness direction comprises: forming a groove by embossing on the first side of the first substrate; and arranging quantum dots and / or fluorescent materials in the groove; The step of disposing a semi-solid second substrate on the first side of the first substrate comprises: sealing the quantum dots and / or fluorescent material in the groove via the second substrate.

11. The method for preparing a light diffuser according to any one of claims 8 to 10, wherein: After curing the second substrate, the preparation method further comprises: A brightness enhancement structure is formed by embossing a surface of one side formed by the second substrate in the target substrate.

12. The method for preparing a light diffuser according to claim 11, wherein: After the surface of one side formed by the second substrate in the target substrate is embossed to form a brightness enhancement structure, the preparation method further comprises: A diffusion ink layer is arranged on the surface of the brightness enhancement structure.

13. A method for preparing a light diffuser, wherein the light diffuser is used in a backlight module, wherein: The preparation method comprises the following steps: A semi-solid first substrate is prepared, wherein the first substrate is provided with one of a diffusion structure and a color conversion structure, wherein the diffusion structure is used to diffuse incident light, and the color conversion structure The structure is used to be excited by light of a preset color to mix and form white light; A semi-solid second substrate is disposed on a first side of the first substrate along a thickness direction, the second substrate is made of the same material as the first substrate, and the other of the diffusion structure and the color conversion structure is disposed in the second substrate; The first substrate and the second substrate are cured so that the first substrate and the second substrate are fused to form an integrally formed target substrate.

14. The method for preparing a light diffuser according to claim 13, wherein: After curing the second substrate, the preparation method further comprises: A brightness enhancement structure is formed by embossing a surface of one side formed by the second substrate in the target substrate.

15. The method for preparing a light diffuser according to claim 14, wherein: After the surface of one side formed by the second substrate in the target substrate is embossed to form a brightness enhancement structure, the preparation method further comprises: A diffusion ink layer is arranged on the surface of the brightness enhancement structure.

16. A backlight module, wherein: The light homogenizing plate includes a substrate, the substrate includes a first part and a second part which are arranged opposite to each other in the thickness direction, a diffusion structure is arranged inside the first part, the diffusion structure is used to diffuse the incident light, and a color conversion structure is arranged inside the second part, the color conversion structure is used to be excited by light of a preset color to emit light of a color different from the preset color.

17. The backlight module according to claim 16, wherein: The color conversion structure includes quantum dots and / or fluorescent materials.

18. The backlight module according to claim 16 or 17, wherein: A brightness enhancement structure is provided on a side of the substrate facing away from the first portion.

19. A display panel, wherein: Comprising the backlight module as claimed in claim 16.

20. A display device, wherein: It comprises the display panel as claimed in claim 19 and a housing that carries the display panel.

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