A quantum dot diffusion plate and display device

Abstract

This utility model discloses a quantum dot diffuser plate and display device, relating to the field of quantum dot diffuser plate technology. The utility model includes a diffuser plate body, comprising a substrate layer, a quantum dot functional layer, and a diffuser layer arranged sequentially from the inside out, and a barrier transition layer disposed between the substrate layer and the quantum dot functional layer via a co-extrusion process. A UV filter layer is disposed between the barrier transition layer and the quantum dot functional layer via a co-extrusion process. A hardened coating is applied to the outside of the diffuser layer. This utility model significantly improves the overall performance of the quantum dot diffuser plate through its multi-layer structure design. The barrier transition layer and UV filter layer extend the lifespan of the quantum dots, ensuring long-term stable display performance. The hardened coating improves the durability of the diffuser plate and reduces damage during daily use.

Description

Technical Field

[0001] This utility model belongs to the field of quantum dot diffusion plates, specifically, it relates to a quantum dot diffusion plate and a display device. Background Technology

[0002] Quantum dot diffusers are a new type of optical element that combines the light conversion properties of quantum dots with the light-uniformation function of traditional diffusers. Their core function is to convert light sources (such as blue light from Mini / MicroLED) into high color gamut red / green / white light through quantum dots, while eliminating light source "hot spots" through the diffusion structure, thereby achieving a dual improvement in brightness uniformity and color performance. They are mainly used in high-end display devices (such as MiniLED TVs, gaming monitors, and automotive screens). However, existing quantum dot diffusers have poor heat resistance and are prone to interlayer delamination at high temperatures, resulting in a significant reduction in display performance, thus limiting their application.

[0003] Chinese patent publication number CN222599869U discloses a quantum dot diffuser plate and a display device. This device uses a diffuser plate and a first plate layer with the same coefficient of thermal expansion on both sides of an optical adhesive layer. When the quantum dot diffuser plate is heated or cooled, the diffuser plate and the first plate layer on both sides of the optical adhesive layer expand or contract synchronously. The diffuser plate and the first plate layer apply deformation forces with opposite directions and equal or similar magnitudes to the optical adhesive layer, so that the forces on both sides of the optical adhesive layer are balanced or at least close to balanced, and no delamination occurs. However, the structural design of this device has low protection performance, which makes it susceptible to damage from external environmental factors during long-term use, thus affecting its service life.

[0004] In view of this, this utility model is proposed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a quantum dot diffusion plate that solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows: A quantum dot diffusion plate includes: a diffusion plate body, which includes a substrate layer, a quantum dot functional layer and a diffusion layer disposed sequentially from the inside to the outside; A barrier transition layer is disposed between the substrate layer and the quantum dot functional layer by a co-extrusion process. A UV filter layer is provided between the barrier transition layer and the quantum dot functional layer by a co-extrusion process. A hardened coating is coated on the outside of the diffusion layer.

[0007] Optionally, the barrier transition layer is an inorganic ultrathin film.

[0008] Optionally, the thickness of the barrier transition layer ranges from 10 nm to 50 nm.

[0009] Optionally, the UV filter layer is made of a transparent UV-absorbing resin.

[0010] Optionally, the thickness of the UV filter layer is between 5 μm and 10 μm.

[0011] Optionally, a microprism array layer is pressed onto the surface of the quantum dot functional layer using a hot-press molding process.

[0012] Optionally, the material of the hardened coating is an organosilicon hardening liquid.

[0013] A display device comprising the quantum dot diffuser plate described in any of the preceding claims.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time: 1. By incorporating a barrier transition layer and a UV filter layer, the multi-layer structure design greatly enhances the overall performance of the quantum dot diffuser plate. The barrier transition layer and UV filter layer extend the lifespan of the quantum dots, ensuring long-term stable display effects. The hardened coating improves the durability of the diffuser plate and reduces damage during daily use. 2. By setting up a microprism array layer, the microprisms redirect light rays that originally had a large divergence angle, causing more light to be emitted towards the front, improving the light utilization efficiency, enhancing the brightness of the front of the display device, thereby increasing the brightness of the front of the display device, reducing light waste, improving the clarity and visual effect of the display without increasing the backlight power, and also improving the viewing angle characteristics to a certain extent.

[0015] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 A structural diagram from another perspective; Figure 3 This is a front view of the present invention; Figure 4 This is a top view of the present invention; Figure 5 This utility model Figure 4 Cross-sectional view at point AA; Figure 6 This is a schematic diagram of the barrier transition layer, UV filter layer and microprism array layer of this utility model.

[0017] The attached diagram lists the components represented by each number as follows: 1. Diffuser plate body; 101. Substrate layer; 102. Quantum dot functional layer; 103. Diffuser layer; 2. Barrier transition layer; 3. UV filter layer; 4. Microprism array layer; 5. Hardened coating.

[0018] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] Example 1 Please see Figure 1-6 As shown, this embodiment provides a quantum dot diffusion plate, including a diffusion plate body 1, which includes a substrate layer 101, a quantum dot functional layer 102 and a diffusion layer 103 arranged sequentially from the inside to the outside, a barrier transition layer 2, which is disposed between the substrate layer 101 and the quantum dot functional layer 102 by a co-extrusion process, a UV filter layer 3 is disposed between the barrier transition layer 2 and the quantum dot functional layer 102 by a co-extrusion process, and a hardened coating 5 is coated on the outside of the diffusion layer 103.

[0021] Specifically, the substrate layer 101 of the diffuser plate body 1 provides basic support. After the light from the backlight module passes through the substrate layer 101, it enters the quantum dot functional layer 102. Under blue light excitation, the quantum dots in the quantum dot functional layer 102 convert some of the blue light into red and green light, which mix with the remaining blue light to form purer white light, thus improving the color gamut. Subsequently, the light enters the diffuser layer 103, where it is scattered to ensure uniform light emission and prevent unevenness such as light spots. The barrier transition layer 2 effectively blocks water vapor, oxygen, and other substances that may be present in the substrate layer 101 from affecting the quantum dots. The functional layer 102 is permeable to prevent the quantum dots from degrading due to water and oxygen erosion. The UV filter layer 3 absorbs ultraviolet rays in light to prevent damage to the quantum dots and further ensure their stability. The outermost hardened coating 5 protects the entire diffuser plate and enhances its wear resistance and scratch resistance. The multi-layer structure design greatly improves the overall performance of the quantum dot diffuser plate. The barrier transition layer 2 and the UV filter layer 3 extend the service life of the quantum dots and ensure long-term stable display effects. The hardened coating 5 improves the durability of the diffuser plate and reduces damage during daily use.

[0022] It should be noted that in this embodiment, the substrate layer 101, the barrier transition layer 2, the UV filter layer 3, and the quantum dot functional layer 102 are formed continuously in one step by a four-layer co-extrusion equipment, with no physical interface between the layers, resulting in strong bonding. The materials of the substrate layer 101, the quantum dot functional layer 102, and the diffusion layer 103 are existing technologies and will not be described here. At the same time, the structure of the diffusion plate body 1 is not limited. Secondly, the hardening coating 5 is applied by coating, using a specific coating equipment to uniformly coat the silicone hardening liquid onto the surface of the diffusion layer 103, and then curing it to make it firmly adhere to the diffusion layer 103. Furthermore, all functional layers are made of highly transparent materials, and the overall stacking does not increase the thickness of the diffusion plate by more than 10% (to avoid affecting the assembly of the backlight module).

[0023] In this embodiment, as Figures 3 to 6 As shown, the barrier transition layer 2 is an inorganic ultrathin film with a thickness ranging from 10nm to 50nm. Specifically, the inorganic ultrathin film, as the barrier transition layer 2, has a tightly packed atomic arrangement and extremely small intermolecular gaps. Water and oxygen molecules have difficulty penetrating into the quantum dot functional layer 102 through these tiny gaps, thus providing protection for the quantum dots. Compared with other barrier materials, the inorganic ultrathin film has superior barrier performance, effectively reducing water and oxygen permeability, better protecting the quantum dots, significantly extending the service life of the quantum dot diffuser plate, and maintaining stable display performance.

[0024] It should be noted that common inorganic ultrathin film materials such as alumina and silicon oxide can be grown on the surface of the substrate layer 101 using techniques such as atomic layer deposition (ALD). ALD technology is a thin film deposition method based on gas-phase chemical reactions, which can precisely control the thickness and growth uniformity of the film, so that the inorganic ultrathin film is tightly bonded to the substrate layer 101. In other embodiments, if low cost is desired, a composite coating of inorganic nanoparticles and organic resins (such as SiO2 nanoparticles dispersed in acrylic resin) with a thickness of 50-100 nm can also be used, which can be achieved by a roll coating process.

[0025] In this embodiment, as Figures 3 to 6 As shown, the UV filter layer 3 is made of transparent UV-absorbing resin, and the thickness of the UV filter layer 3 is between 5μm and 10μm. Specifically, the absorber molecules in the transparent UV-absorbing resin can absorb the energy of ultraviolet photons and convert them into the vibration or rotation energy of molecules, thereby preventing ultraviolet rays from reaching the quantum dot functional layer 102, avoiding damage to the quantum dots from ultraviolet rays, protecting the quantum dots from ultraviolet damage, maintaining the stability and luminous performance of the quantum dots, and thus ensuring that the display device can stably present high-quality colors and brightness for a long time.

[0026] It should be noted that the transparent UV absorbing resin can be acrylic resin, polyurethane resin, etc., with the addition of ultraviolet absorbers such as benzotriazole and triazine. These absorbers can selectively absorb ultraviolet rays in a specific wavelength range and have good compatibility with the resin matrix. It is connected to the barrier transition layer 2 and the quantum dot functional layer 102 through a co-extrusion process. During the co-extrusion process, the transparent UV absorbing resin and other layer materials are fused under high temperature and high pressure to form a tight bond.

[0027] Example 2 In this embodiment, as Figures 3 to 6 As shown, a microprism array layer 4 is pressed onto the surface of the quantum dot functional layer 102 using a hot-press molding process. Specifically, the thickness of the microprism array layer 4 ranges from 5μm to 10μm. The microprism array layer 4 is composed of a series of tiny prism structures. When light emitted from the quantum dot functional layer 102 encounters a microprism, its propagation direction changes according to the refraction principle of the prism. The microprism redirects the light rays that originally had a large divergence angle, causing more light to be emitted towards the front, improving the light utilization efficiency, enhancing the front brightness of the display device, thereby increasing the front brightness of the display device, reducing light waste, improving the clarity and visual effect of the display without increasing the backlight power, and improving the viewing angle characteristics to a certain extent.

[0028] It should be noted that in the hot pressing molding process, the precision of the mold is crucial to the quality of the microprism array layer 4. The dimensional accuracy and surface roughness of the microprism structure of the mold will directly affect the optical performance and light refraction effect of the microprism. At the same time, the parameters such as temperature, pressure and time of hot pressing also need to be precisely controlled to ensure that the microprism is firmly bonded to the quantum dot functional layer 102 without damaging the quantum dot functional layer 102.

[0029] Example 3 In this embodiment, as Figures 3 to 6 As shown, the material of the hardened coating 5 is an organosilicon hardening liquid. Specifically, after the organosilicon hardening liquid is coated onto the surface of the diffusion layer 103 and cured, it forms a hard and dense protective film. This protective film can resist scratches and abrasions from external objects, protecting the diffusion layer 103 and other internal functional layers from physical damage, thereby significantly improving the wear resistance and scratch resistance of the quantum dot diffusion plate, extending the service life of the diffusion plate, and making it more suitable for application in various complex environments. It should be noted that the organosilicon hardening liquid is evenly covered on the surface of the diffusion layer 103 by coating methods such as scraping, spraying, or roller coating, and then cured by ultraviolet irradiation or heating. During the coating process, it is necessary to ensure the uniformity of the organosilicon hardening liquid coating; otherwise, it may lead to inconsistent local hardness and affect the overall protective effect.

[0030] Working principle: The substrate layer 101 of the diffuser plate body 1 provides basic support. After the light from the backlight module passes through the substrate layer 101, it enters the quantum dot functional layer 102. Under blue light excitation, the quantum dots in the quantum dot functional layer 102 convert some of the blue light into red and green light, which mix with the remaining blue light to form purer white light, thus improving the color gamut. Subsequently, the light enters the diffuser layer 103, where it is scattered to ensure uniform light emission and prevent unevenness such as light spots. The barrier transition layer 2 effectively blocks water vapor, oxygen, and other substances that may be present in the substrate layer 101 from affecting the quantum dot functional layer. Layer 102 permeates to prevent the quantum dots from degrading due to water and oxygen erosion. UV filter layer 3 absorbs ultraviolet rays in light, preventing UV damage to the quantum dots and further ensuring their stability. The outermost hardened coating layer 5 protects the entire diffuser plate, enhancing its wear resistance and scratch resistance. The multi-layer structure design greatly improves the overall performance of the quantum dot diffuser plate. The barrier transition layer 2 and UV filter layer 3 extend the lifespan of the quantum dots, ensuring long-term stable display effects. The hardened coating layer 5 improves the durability of the diffuser plate and reduces damage during daily use.

[0031] This embodiment provides a display device, which includes the quantum dot diffusion plate provided in the above embodiment.

[0032] This utility model is not limited to the above-described embodiments. Anyone should know that structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all publicly known technologies.

Claims

1. A quantum dot diffusion plate, characterized by, include: The diffuser plate body (1) includes a substrate layer (101), a quantum dot functional layer (102) and a diffuser layer (103) arranged sequentially from the inside to the outside; A barrier transition layer (2) is disposed between the substrate layer (101) and the quantum dot functional layer (102) by a co-extrusion process. A UV filter layer (3) is disposed between the barrier transition layer (2) and the quantum dot functional layer (102) by a co-extrusion process. A hardened coating (5) is coated on the outside of the diffusion layer (103).

2. The quantum dot diffusion plate of claim 1, wherein, The barrier transition layer (2) is an inorganic ultrathin film.

3. The quantum dot diffusion plate of claim 2, wherein, The thickness of the barrier transition layer (2) is between 10 nm and 50 nm.

4. A quantum dot diffusion plate according to claim 2, characterized in that, The UV filter layer (3) is made of transparent UV-absorbing resin.

5. The quantum dot diffusion plate of claim 4, wherein, The thickness of the UV filter layer (3) is between 5 μm and 10 μm.

6. The quantum dot diffusion plate of claim 1, wherein, The surface of the quantum dot functional layer (102) is pressed with a microprism array layer (4) by a hot pressing molding process.

7. The quantum dot diffusion plate of claim 1, wherein, The material of the hardened coating (5) is an organosilicon hardening liquid.

8. A display device, characterized by comprising: Includes the quantum dot diffusion plate as described in any one of claims 1 to 7.

Images