High-brightness blue light blocking quantum dot optical plate, its manufacturing method and backlight module

Abstract

The present invention relates to a high-brightness blue light-cut quantum dot optical plate, a manufacturing method thereof, and a backlight module, which belong to the technical fields of display and lighting. The quantum dot optical plate is configured to include a light diffusion layer (5), a quantum dot layer (3), and a brightness improvement layer (1) in this order, a first light transition layer (4) is provided between the quantum dot layer (3) and the light diffusion layer (5), a second light transition layer (2) is provided between the quantum dot layer (3) and the brightness improvement layer (1), and the refractive indexes of the light diffusion layer (5), the first light transition layer (4), the quantum dot layer (3), the second light transition layer (2), and the brightness improvement layer (1) are t 光拡散層(5) ≦t 第1の光遷移層(4) ≦t 量子ドット層(3) ≦t 第2の光遷移層(2) ≦t 輝度向上層(1) and a first coarse particle (6) and a second coarse particle (7) are provided between the light diffusion layer (5) and the first light transition layer (4), and between the brightness improvement layer (1) and the second light transition layer (2), respectively. The quantum dot optical plate has the advantages of high brightness and blue light blocking, has a wide range of applications, can be applied to edge-type and direct-type backlight modules, does not require expensive water and oxygen barrier films, is easy to assemble, and reduces the manufacturing costs of the backlight module device.

Description

[Technical Field]

[0001] The present application relates to the technical field of display and lighting, and more particularly to a high-brightness blue-light-blocking quantum dot optical plate, a manufacturing method thereof, and a backlight module. [Background technology]

[0002] Quantum dot materials have the characteristics of a wide excitation spectrum, a narrow emission spectrum, high color purity, and excellent photostability, and are therefore applied in the fields of display and lighting. Quantum dot optical devices can effectively expand the color gamut of devices and make the display effects of devices more vivid and impressive.

[0003] However, the prior art suffers from the following drawbacks: (1) Quantum dot diffusers alone can only meet the needs of direct-type backlight modules, but not edge-type backlight modules. This is because the thickness of quantum dot diffusers used in direct-type backlight modules is generally 1.5-2.0 mm, roughly the same as that of regular diffusers. Using such a plate directly in an edge-type module increases the thickness of the backlight module (edge-type backlight modules have the advantage of being lighter and thinner than direct-type backlight modules), thereby eliminating the advantages of edge-type backlight modules. (2) Quantum dot light guide plates can meet the needs of edge-type backlights, but not direct-type backlight modules. This is because edge-type backlight modules use quantum dot technology and must be combined with a light guide plate structure, which cannot be used in direct-type modules. Therefore, even if a quantum dot diffuser is suitable for an edge-type backlight module, it does not necessarily meet the needs of a direct-type module. (3) The assembly process cost of quantum dot light conversion film can be the same for both edge-type and backlight-type backlight modules, but the usage cost is high. This is because the manufacturing cost of the water and oxygen barrier film in quantum dot light conversion film is high, making it unsuitable for widespread use.

[0004] CN109849388A provides a quantum dot optical functional plate and a manufacturing method thereof. The quantum dot optical functional plate includes a light-collecting layer, a functional layer, and a diffusing layer. The functional layer is disposed between the light-collecting layer and the diffusing layer, and a predetermined pattern is formed on the surface of the light-collecting layer facing away from the functional layer and the surface of the diffusing layer facing away from the functional layer. This technology uses a light-collecting layer, a functional layer, and a diffusing layer, which are subjected to a co-extrusion in-mold composite process using multiple extruders, followed by hot pressing with a three-roll calender to form a predetermined micro-structured pattern on the surface, thereby improving the blemish coverage and brightness of the quantum dot optical functional plate. At the same time, the upper and lower two-layer structure serves to protect the quantum dot functional layer, ensuring stable and continuous light emission from the quantum dots.

[0005] CN108803141A provides quantum dot integrated optical components, backlight modules, and liquid crystal displays. By laminating a brightness enhancement film group and a diffusion plate on opposite sides of a quantum dot film layer, respectively, it is possible to prevent external water vapor and oxygen from affecting the luminescence performance of the quantum dot material, avoiding the need to encapsulate the quantum dot material using a barrier film with a complex structure, and reducing costs.

[0006] Although the above-mentioned conventional technology overcomes the drawback that quantum dot light conversion films require costly water and oxygen barrier films, it lacks the design of the light propagation path as the light passes through each layer structure, resulting in low light utilization rate, and there is a need for improvements in the blue light blocking effect. Summary of the Invention [Problem to be solved by the invention]

[0007] The purpose of this application is to overcome the deficiencies of conventional quantum dot optical plates, which require improvements in brightness and blue light blocking effects but have a narrow range of applications, by providing a high-brightness blue light blocking quantum dot optical plate, a manufacturing method thereof, and a backlight module, which have the advantages of high brightness and blue light blocking and a wide range of applications, can be applied to edge-type and direct-type backlight modules, do not require expensive water and oxygen barrier films, are widely used, are easy to assemble, and contribute to reducing the manufacturing costs of backlight module devices. [Means for solving the problem]

[0008] In order to achieve the above object, in a first aspect, the present application provides a high-brightness blue-light-cut quantum dot optical plate including a light diffusion layer, a quantum dot layer, and a brightness enhancement layer in this order, wherein a first light transition layer is provided between the quantum dot layer and the light diffusion layer, and a second light transition layer is provided between the quantum dot layer and the brightness enhancement layer, and the refractive indices of the light diffusion layer, the first light transition layer, the quantum dot layer, the second light transition layer, and the brightness enhancement layer are t 光拡散層 ≦t 第1の光遷移層 ≦t 量子ドット層 ≦t 第2の光遷移層 ≦t 輝度向上層 and a first coarse particle and a second coarse particle are disposed between the light diffusion layer and the first light transition layer, and between the brightness improvement layer and the second light transition layer, respectively.

[0009] Furthermore, the thickness of the first optical transition layer is 0.01 to 0.25 mm, the thickness of the second optical transition layer is 0.01 to 0.25 mm, and the thickness of the quantum dot layer is 0.1 to 1.0 mm.

[0010] Furthermore, the thickness of the first optical transition layer is 0.01 to 0.15 mm, the thickness of the second optical transition layer is 0.01 to 0.15 mm, and the thickness of the quantum dot layer is 0.1 to 0.7 mm.

[0011] Furthermore, the first coarse particles have a refractive index that differs from that of the first optical transition layer by less than 0.01.

[0012] Furthermore, the second coarse particles have a refractive index that differs from that of the brightness enhancing layer by less than 0.01.

[0013] Furthermore, the material of the first coarse particles is the same resin material as the base material of the first optical transition layer.

[0014] Furthermore, the material of the second coarse particles is the same resin material as the base material of the brightness enhancing layer.

[0015] Furthermore, when the refractive index difference between the light diffusion layer and the first light transition layer satisfies 0.1≦δt≦0.2, the particle size range of the first coarse particles is 0.1 to 0.2 mm; when the refractive index difference between the light diffusion layer and the first light transition layer satisfies 0.01<δt<0.1, the particle size range of the first coarse particles is 0.01 to 0.2 mm; and when the refractive index difference between the light diffusion layer and the first light transition layer satisfies δt≦0.01, the particle size range of the first coarse particles is 0.001 to 0.2 mm.

[0016] Furthermore, when the refractive index difference between the brightness enhancing layer and the second optical transition layer satisfies 0.1≦δt≦0.2, the particle size range of the second coarse particles is 0.1 to 0.2 mm; when the refractive index difference between the brightness enhancing layer and the second optical transition layer satisfies 0.01<δt<0.1, the particle size range of the second coarse particles is 0.01 to 0.2 mm; and when the refractive index difference between the brightness enhancing layer and the second optical transition layer satisfies δt≦0.01, the particle size range of the second coarse particles is 0.001 to 0.2 mm.

[0017] Furthermore, first quantum dot layer coarse particles are laid between the quantum dot layer and the first optical transition layer, and / or second quantum dot layer coarse particles are laid between the quantum dot layer and the second optical transition layer.

[0018] Furthermore, the first quantum dot layer coarse particles have a refractive index that differs by less than 0.01 from the substrate of the quantum dot layer, and the second quantum dot layer coarse particles have a refractive index that differs by less than 0.01 from the second optical transition layer.

[0019] Furthermore, when the refractive index difference between the quantum dot layer and the first optical transition layer satisfies 0.1≦δt≦0.2, the particle size range of the first quantum dot layer coarse particles is 0.1 to 0.2 mm; when the refractive index difference between the quantum dot layer and the first optical transition layer satisfies 0.01<δt<0.1, the particle size range of the first quantum dot layer coarse particles is 0.01 to 0.2 mm; and when the refractive index difference between the quantum dot layer and the first optical transition layer satisfies δt≦0.01, the particle size range of the first quantum dot layer coarse particles is 0.001 to 0.2 mm.

[0020] Furthermore, when the refractive index difference between the quantum dot layer and the second optical transition layer satisfies 0.1≦δt≦0.2, the particle size range of the second quantum dot layer coarse particles is 0.1 to 0.2 mm; when the refractive index difference between the quantum dot layer and the second optical transition layer satisfies 0.01<δt<0.1, the particle size range of the second quantum dot layer coarse particles is 0.01 to 0.2 mm; and when the refractive index difference between the quantum dot layer and the second optical transition layer satisfies δt≦0.01, the particle size range of the second quantum dot layer coarse particles is 0.001 to 0.2 mm.

[0021] Furthermore, the material of the first quantum dot layer coarse particles is the same resin material as the substrate of the quantum dot layer, and the material of the second quantum dot layer coarse particles is the same resin material as the substrate of the second optical transition layer.

[0022] Furthermore, the thickness of the quantum dot optical plate is 0.2 mm to 2 mm.

[0023] In a second aspect, the present application provides a method for manufacturing a high-brightness blue-light-cutting quantum dot optical plate according to the first aspect, the method including: (1) measuring the refractive indexes of the quantum dot layer, the light diffusion layer, and the brightness enhancement layer, and selecting a photocurable adhesive and / or a hot-melt adhesive as a first optical transition layer adhesive and a second optical transition layer adhesive according to the refractive index measurement results; (2) applying the adhesive layer one by one to the quantum dot layer to form a first optical transition layer and a second optical transition layer whose refractive index changes; (3) laying first coarse particles on the first optical transition layer and laying second coarse particles on the second optical transition layer; and (4) bonding a light diffusion layer to the first optical transition layer and a brightness enhancement layer to the second optical transition layer, and performing ultraviolet curing and / or thermal curing.

[0024] Furthermore, between step (1) and step (2), The method further includes a step of laying first quantum dot layer coarse particles or second quantum dot layer coarse particles on one side of the quantum dot layer, or a step of laying first quantum dot layer coarse particles and second quantum dot layer coarse particles on both sides of the quantum dot layer, respectively.

[0025] In a third aspect, the present application provides a backlight module including the high-brightness blue-light-cut quantum dot optical plate described above. [Effects of the Invention]

[0026] The quantum dot optical plate of the present application optimizes the transmission path of the optical path in each layer through the specific structural design described above, in particular by setting the refractive index of various materials in each specific layer and providing first coarse particles and second coarse particles accordingly, and the formed quantum dot optical plate has at least the following advantages:

[0027] 1. The quantum dot optical plate of the present application exhibits low light loss when passing through it, resulting in high brightness. Specifically, prior art techniques have not taken into account the difference in refractive index between films and the large offset distance of light when transmitting through different layers, resulting in excessive reflection of light, both of which lead to increased dispersion of light as it passes between films and reduced light utilization efficiency. The present application specifies that after light enters the quantum dot optical plate from the air layer, it constantly passes from an optically dilute medium to an optically dense medium within its structure, reducing light reflection, shortening the offset distance of light, and increasing light utilization efficiency. When light passes through different flat interfaces, the material properties and transparency of each interface are different, making it easy for specular reflection to occur at the flat interfaces. However, in the present application, by simultaneously providing the second coarse particles and the preferably provided second quantum dot layer coarse particles, the roughness of the corresponding interfaces is increased, further reducing the reflection phenomenon during light propagation. By arranging them in accordance with the changing trends of the refractive index of each layer, the loss of light passing through the optical plate is significantly reduced, allowing more light to pass through the brightness enhancement layer, further enhancing the function of the brightness enhancement layer and better achieving the goals of light uniformity and brightness enhancement.

[0028] 2. The present invention can effectively absorb blue light, expanding the color gamut of an optical device while reducing the blue light output. Specifically, the present invention increases the roughness of the light diffusion layer and quantum dot layer by providing first coarse particles and preferably first quantum dot layer coarse particles. The placement of coarse particles and the setting of the refractive index between each layer reduce the amount of light reflection when light passes through a rough interface, increasing light transmittance and blue light transmittance. At the same time, the rough surface provides more multi-angle and multi-directional incident angles for blue light when it passes through the rough surface and enters the quantum dot layer, allowing blue light to excite the quantum dot material in multiple directions, thereby increasing the blue light utilization rate of the quantum dot material. A backlight module using the present invention's structure has higher blue light transmittance and utilization rate, allowing it to excite the quantum dots with less blue light to achieve the same display effect. The present invention's utilization rate of blue light is significantly superior to that of existing optical function panels, thereby reducing the impact of blue light on consumers and better achieving the goal of eye protection.

[0029] 3. The quantum dot optical plate of the present invention has a wide range of applications and can be directly applied to various types of backlights, such as edge-type and direct-type backlight modules.

[0030] 4. In this application, the light diffusion layer, brightness enhancement layer, and quantum dot layer are integrated, which reduces manufacturing costs and simplifies use by device manufacturers, allowing device manufacturers to save on the process and costs of assembling the light diffusion layer and brightness enhancement layer, and allows device manufacturers to perform intelligent assembly using robots, etc., avoiding the need to install films and plates multiple times, increasing installation yield and reducing assembly costs. In addition, quantum dot technology can be used in display devices at low cost, expanding the color gamut of LCD displays while reducing use and assembly costs for TV manufacturers. [Brief explanation of the drawings]

[0031] [Figure 1] 1 is a schematic diagram of a specific structure of a quantum dot optical plate according to the present invention; [Figure 2] 1 is a schematic diagram of another specific structure of the quantum dot optical plate of the present application, where: 1... brightness enhancement layer, 2... second optical transition layer, 3... quantum dot layer, 4... first optical transition layer, 5... light diffusion layer, 6... first coarse particles, 7... second coarse particles, 8... first quantum dot layer coarse particles, 9... second quantum dot layer coarse particles. DETAILED DESCRIPTION OF THE INVENTION

[0032] The endpoints of ranges and any values ​​disclosed herein are not limited to that exact range or value, and these ranges or values ​​should be understood to include values ​​close to them. In the case of numerical ranges, the endpoints of each range, and the endpoints of each range and each individual endpoint, and the individual endpoints can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be considered to be specifically disclosed herein.

[0033] As mentioned above, in a first aspect, the present application provides a high-brightness blue light-cutting quantum dot optical plate. As shown in Figures 1 and 2, the optical plate includes a light diffusion layer 5, a quantum dot layer 3, and a brightness enhancement layer 1 in this order. A first light transition layer 4 is provided between the quantum dot layer 3 and the light diffusion layer 5, and a second light transition layer 2 is provided between the quantum dot layer 3 and the brightness enhancement layer 1. The refractive indices of the light diffusion layer 5, the first light transition layer 4, the quantum dot layer 3, the second light transition layer 2, and the brightness enhancement layer 1 are t 光拡散層 ≦t 第1の光遷移層 ≦t 量子ドット層 ≦t 第2の光遷移層 ≦t 輝度向上層 and first coarse particles 6 and second coarse particles 7 are laid between the light diffusing layer 5 and the first light transition layer 4, and between the brightness improving layer 1 and the second light transition layer 2, respectively.

[0034] In this application, the "optical transition layer" can be considered as a gradation transition layer in which the refractive index of light changes, and serves to increase light transmittance and reduce the light reflection phenomenon (which reduces light utilization efficiency) caused by the difference in refractive index at the location where the plate material (i.e., quantum dot layer 3) and the film material (i.e., light diffusion layer 5 or brightness enhancement layer 1) are bonded. Also, in this application, the "coarse particles" can be considered as particulate matter that optimizes light propagation, and serves to increase the roughness of the interlayer interface, further reducing the light reflection phenomenon and improving brightness enhancement performance and blue light blocking performance.

[0035] In the present application, "having substantially the same refractive index" can be understood to mean that the refractive index is the same to an accuracy of one part in a thousand.

[0036] In the present invention, the occurrence of reflection when light passes through the multilayer structure is reduced by providing the first optical transition layer 4 and the second optical transition layer 2 and setting the refractive index of the multilayer structure to gradually increase. In addition, the occurrence of reflection is further reduced by providing first coarse particles 6 and second coarse particles 7 between the light diffusion layer 5 and the first optical transition layer 4, and between the brightness improvement layer 1 and the second optical transition layer 2, respectively, thereby improving the brightness and enhancing the blue light blocking effect.

[0037] According to the present application, the thickness of the first optical transition layer 4 is preferably 0.01 to 0.25 mm, and the thickness of the second optical transition layer 2 is preferably 0.01 to 0.25 mm, and more preferably 0.01 to 0.15 mm, and the thickness of the second optical transition layer 2 is more preferably 0.01 to 0.15 mm. It is understood that the thicknesses of the first optical transition layer 4 and the second optical transition layer 2 may be the same or different.

[0038] The thickness of the quantum dot layer 3 is preferably 0.1 to 1.0 mm, and more preferably 0.1 to 0.7 mm.

[0039] In the above preferred embodiment, the distance that light travels between the optical transition layer and the quantum dot layer 3 is further reduced, the offset distance is further reduced, and the light utilization rate is increased. The resulting quantum dot optical plate can achieve the comprehensive effects of ultra-thinness, high brightness, and blue light blocking.

[0040] In the present application, there is no particular limitation on the material of the first optical transition layer 4 and the second optical transition layer 2, as long as it satisfies the above-mentioned specific refractive index and is suitable for an optical plate. Non-limiting examples of the substrate of the optical transition layer may be selected from PMMA (Polymethyl Methacrylate), PET (Polyethylene Terephthalate), PC (Polycarbonate), MS, PP, and PS (Polystyrene).

[0041] According to the present application, the first coarse particles 6 have a refractive index that differs from that of the first optical transition layer 4 by less than 0.01, and preferably is substantially the same as that of the first optical transition layer 4 .

[0042] The second coarse particles 7 preferably have a refractive index that differs from that of the brightness enhancing layer 1 by less than 0.01, and preferably has a refractive index that is substantially the same as that of the brightness enhancing layer 1.

[0043] In the above-described preferred embodiment, the refractive index difference between the first coarse particles 6 and / or the second coarse particles 7 and the adjacent layer is reduced in order to reduce the occurrence of the light reflection phenomenon when light passes through the coarse particles and enters the next layer.

[0044] In the present application, there are no particular limitations on the materials of the first coarse particles 6 and the second coarse particles 7, but for the purposes of simplifying the process and reducing the refractive index difference, it is preferable that the material of the first coarse particles 6 is the same resin material as the base material of the first optical transition layer 4. It is also preferable that the material of the second coarse particles 7 is the same resin material as the base material of the brightness enhancement layer 1.

[0045] In the present application, the particle size of the coarse particles is not particularly limited as long as it can exert the effect of increasing the roughness of the interface. The size of the added coarse particles is preferably related to the difference in refractive index between the transition layer and the adjacent optical film material, and the larger the refractive index difference between the adjacent layers, the larger the particle size of the coarse particles used. Coarse particles The size of the material increases. The more the refractive index differs, the more easily light is reflected at a flat interface due to the difference in the physical properties and transparency between materials. Coarse particles Increasing the size of the coarse particles further increases the roughness and weakens the occurrence of reflection. The applicant's research has found that when the difference in refractive index between adjacent layers is large, the light offset distance is small, but reflection is more likely to occur at flat interfaces. The use of large-sized coarse particles can reduce reflection, and the synergistic effect of setting the refractive index change trend and laying the coarse particles can significantly increase the light utilization rate. On the other hand, when the difference in refractive index between adjacent layers is small, the light offset distance is large, the reflection at flat interfaces is weakened, and the effect of the particle size of the coarse particles on reflection is also weakened.

[0046] When the refractive index difference between the light diffusion layer 5 and the first light transition layer 4 satisfies 0.1≦δt≦0.2, the particle size range of the first coarse particles 6 is 0.1 to 0.2 mm; when the refractive index difference between the light diffusion layer 5 and the first light transition layer 4 satisfies 0.01<δt<0.1, the particle size range of the first coarse particles 6 is 0.01 to 0.2 mm; and when the refractive index difference between the light diffusion layer 5 and the first light transition layer 4 satisfies δt≦0.01, the particle size range of the first coarse particles 6 is preferably 0.001 to 0.2 mm.

[0047] When the refractive index difference between the brightness improving layer 1 and the second optical transition layer 2 satisfies 0.1≦δt≦0.2, the particle size range of the second coarse particles 7 is 0.1 to 0.2 mm; when the refractive index difference between the brightness improving layer 1 and the second optical transition layer 2 satisfies 0.01<δt<0.1, the particle size range of the second coarse particles 7 is 0.01 to 0.2 mm; and when the refractive index difference between the brightness improving layer 1 and the second optical transition layer 2 satisfies δt≦0.01, the particle size range of the second coarse particles 7 is preferably 0.001 to 0.2 mm.

[0048] In the above preferred embodiment, the brightness improving performance and / or blue light blocking performance of the quantum dot optical plate can be further improved.

[0049] 2 shows another embodiment of the present invention. First quantum dot layer coarse particles 8 are disposed between the quantum dot layer 3 and the first optical transition layer 4. Second quantum dot layer coarse particles 9 are disposed between the quantum dot layer 3 and the second optical transition layer 2.

[0050] In another embodiment not shown, the first quantum dot layer coarse particles are laid only between the quantum dot layer and the first optical transition layer.

[0051] In another embodiment not shown, the second quantum dot layer coarse particles are laid only between the quantum dot layer and the second optical transition layer.

[0052] In a preferred embodiment in which the above-mentioned first quantum dot layer coarse particles and / or second quantum dot layer coarse particles are provided, the roughness of the interface is further increased, thereby reducing the reflection phenomenon when light passes through the corresponding interface, further reducing light loss, and enhancing the blue light blocking effect.

[0053] The first quantum dot layer coarse particles have a refractive index that differs from that of the substrate of the quantum dot layer by less than 0.01, and preferably is substantially the same as that of the substrate of the quantum dot layer, and the second quantum dot layer coarse particles have a refractive index that differs from that of the second optical transition layer by less than 0.01, and preferably is substantially the same as that of the second optical transition layer.

[0054] The refractive index difference between the first quantum dot layer coarse particles 8 and / or the second quantum dot layer coarse particles 9 and the adjacent layer is reduced in order to reduce the occurrence of light reflection when light passes through the coarse particles and enters the next layer.

[0055] The size of the first quantum dot layer coarse particles 8 and / or the second quantum dot layer coarse particles 9, like the first coarse particles 6 and the second coarse particles 7, is related to the difference in refractive index between the quantum dot layer 3 and the adjacent transition layer.

[0056] When the refractive index difference between the quantum dot layer 3 and the first optical transition layer 4 satisfies 0.1≦δt≦0.2, the particle size range of the first quantum dot layer coarse particles 8 is 0.1 to 0.2 mm; when the refractive index difference between the quantum dot layer 3 and the first optical transition layer 4 satisfies 0.01<δt<0.1, the particle size range of the first quantum dot layer coarse particles 8 is 0.01 to 0.2 mm; and when the refractive index difference between the quantum dot layer 3 and the first optical transition layer 4 satisfies δt≦0.01, the particle size range of the first quantum dot layer coarse particles 8 is preferably 0.001 to 0.2 mm.

[0057] When the refractive index difference between the quantum dot layer 3 and the second optical transition layer 2 satisfies 0.1≦δt≦0.2, the particle size range of the second quantum dot layer coarse particles 9 is 0.1 to 0.2 mm; when the refractive index difference between the quantum dot layer 3 and the second optical transition layer 2 satisfies 0.01<δt<0.1, the particle size range of the second quantum dot layer coarse particles 9 is 0.01 to 0.2 mm; and when the refractive index difference between the quantum dot layer 3 and the second optical transition layer 2 satisfies δt≦0.01, the particle size range of the second quantum dot layer coarse particles 9 is preferably 0.001 to 0.2 mm.

[0058] In the above preferred embodiment, the brightness improving performance and / or blue light blocking performance of the quantum dot optical plate can be further improved.

[0059] In the present application, there are no particular limitations on the materials of the first quantum dot layer coarse particles 8 and the second quantum dot layer coarse particles 9. For the purposes of simplifying the process and reducing the refractive index difference, it is preferable that the material of the first quantum dot layer coarse particles 8 and / or the second quantum dot layer coarse particles 9 be the same resin material as the substrate of the quantum dot layer 3, and non-limiting examples of such resin materials may be selected from PS, PMMA, PC, MS, PET, and PP.

[0060] According to the present application, the thickness of the quantum dot optical plate is preferably 0.2 mm to 2 mm, and more preferably 0.5 mm to 1.5 mm. The thickness is significantly smaller than that of existing quantum dot optical functional plates, and in this preferred embodiment, the light has a shorter propagation distance and offset distance when passing through different media, so that the light can be more concentrated and enter the brightness enhancement layer 1, and then emitted after being collected by the brightness enhancement layer 1, achieving a better brightness enhancement effect.

[0061] In the present application, it is understood that there are no particular limitations on the composition and structure of the brightness enhancement layer 1 and the light diffusion layer 5, as long as they can exhibit the light diffusion and brightness enhancement effects. It is preferable that the brightness enhancement layer 1 has a prism structure, which can collect scattered light and further increase the light intensity, as shown in Figures 1 and 2.

[0062] In the quantum dot optical plate of the present application, the structural design between the quantum dot layer 3 and the light diffusion layer 5 can effectively improve blue light blocking performance, and the structural design between the quantum dot layer 3 and the brightness enhancement layer 1 can effectively improve brightness. The quantum dot optical plate of the present application integrates the light diffusion layer 5, the brightness enhancement layer 1, and the quantum dot layer 3, and optimizes the light propagation path in each layer to increase light utilization rate, improve brightness and blue light blocking effect, and meet the assembly needs of a small number of terminal device manufacturers, laying the foundation for intelligent manufacturing.

[0063] In the present application, the method for manufacturing a quantum dot optical plate is not particularly limited as long as it can form a quantum dot optical plate having the above-described specific structure.

[0064] In a second aspect, the present application provides a method for manufacturing the above-mentioned high-brightness blue-light-cut quantum dot optical plate, the method comprising the steps of: Step (1): Measure the refractive indexes of the quantum dot layer 3, the light diffusion layer 5, and the brightness enhancement layer 1, and select a photocurable adhesive and / or a hot melt adhesive as the first optical transition layer adhesive and the second optical transition layer adhesive according to the refractive index measurement results. Step (2): An adhesive is applied to the quantum dot layer one layer at a time to form the first optical transition layer 4 and the second optical transition layer 2, whose refractive index changes. Step (3): First coarse particles 6 are laid on the first optical transition layer 4, and second coarse particles 7 are laid on the second optical transition layer 2. Step (4): The light diffusion layer 5 is bonded to the first light transition layer 4, the brightness improvement layer 1 is bonded to the second light transition layer 2, and then ultraviolet curing and / or thermal curing are performed.

[0065] In the present application, the quantum dot layer 3, the light diffusion layer 5, and the brightness enhancement layer 1 are all based on conventional technology and can be freely selected by those skilled in the art according to their needs, and there are no limitations in this application. The thicknesses of the quantum dot layer 3, the light diffusion layer 5, and the brightness enhancement layer 1 may be any thickness that satisfies the desired thickness of the quantum dot optical plate.

[0066] In the step (1) of the present application, "selecting a photocurable adhesive and / or a hot melt adhesive as the first optical transition layer adhesive and the second optical transition layer adhesive according to the refractive index measurement results" means selecting an adhesive whose refractive index after curing satisfies the refractive index specified for each layer of the quantum dot optical plate described in the first aspect.

[0067] In step (2), the adhesive can be understood to mean the first optical transition layer adhesive and the second optical transition layer adhesive. The amount and thickness of the first optical transition layer adhesive and the second optical transition layer adhesive can be determined as long as they satisfy the predetermined structure of the first optical transition layer 4 and the second optical transition layer 2 in the quantum dot optical plate.

[0068] In step (2), there is no limitation on the method for applying the adhesive, and non-limiting examples of the application method include spray application and roller application.

[0069] In another embodiment, the method further includes, between steps (1) and (2), a step of laying first quantum dot layer coarse particles 8 or second quantum dot layer coarse particles 9 on one side of the quantum dot layer, or a step of laying first quantum dot layer coarse particles 8 and second quantum dot layer coarse particles 9 on both sides of the quantum dot layer.

[0070] In a third aspect, the present application provides a backlight module including the high-brightness blue-light-cut quantum dot optical plate described above.

[0071] The quantum dot optical plate of the present application is suitable for edge-type or direct-type backlight modules, and has a wide range of applications. In the prior art, the applications of quantum dot backlight modules were limited to televisions and computer displays, but the quantum dot optical plate backlight module of the present application can be expanded to terminals other than televisions and computer displays, such as laptops, tablet PCs, and mobile phones.

[0072] The present invention will be described in more detail below with reference to examples.

[0073] Example 1 The quantum dot optical plate is configured to include a light diffusion layer 5, a quantum dot layer 3, and a brightness enhancement layer 1 in this order, with a first light transition layer 4 provided between the quantum dot layer 3 and the light diffusion layer 5, a second light transition layer 2 provided between the quantum dot layer 3 and the brightness enhancement layer 1, and first coarse particles 6 and second coarse particles 7 provided between the light diffusion layer 5 and the first light transition layer 4, and between the brightness enhancement layer 1 and the second light transition layer 2, respectively. The first and second light transition layers are made by curing an acrylic resin adhesive, with the first coarse particles made of acrylic resin powder and the second coarse particles made of PET powder.

[0074] Specifically, the light diffusion layer 5 is made of a PET material, the quantum dot layer 3 is made of a PS material, and the brightness enhancement layer 1 is made of a PET material.

[0075] Here, the refractive index of the light diffusing layer 5 is 1.42, the refractive index of the first light transition layer 4 is 1.46, the refractive index of the quantum dot layer 3 is 1.52, the refractive index of the second light transition layer 2 is 1.56, and the refractive index of the brightness improving layer 1 is 1.59. The particle diameter of the first coarse particles 6 is 0.008 mm, and the particle diameter of the second coarse particles 7 is 0.008 mm.

[0076] The quantum dot optical plate of the example was placed in a backlight module with the same blue light power, and the blue light intensity and brightness were measured at the exact center of the plate using a blue light intensity meter and a color analyzer, respectively.

[0077] The optical plate of the original model is made by laminating a PET light-diffusing layer, a PS quantum dot layer, and a PET brightness-enhancing layer in that order. The refractive index of the light-diffusing layer is 1.59, the refractive index of the quantum dot layer is 1.52, and the refractive index of the brightness-enhancing layer is 1.59.

[0078] When the measured blue light intensity and brightness values ​​were compared with the data obtained from testing the original model, it was confirmed that brightness increased by 6.12% and blue light intensity decreased by 5.08%.

[0079] Example 2 The quantum dot optical plate of Example 1 differs only in that the particle diameter of the first coarse particles is 0.1 mm.

[0080] When the brightness and blue light intensity test data was compared with the original model, it was confirmed that the brightness increased by 8.14% and the blue light intensity decreased by 9.05%.

[0081] Example 3 The quantum dot optical plate of Example 1 differs only in that the particle diameter of the second coarse particles is 0.1 mm.

[0082] When the brightness and blue light intensity test data was compared with the original model, it was confirmed that the brightness increased by 10.02% and the blue light intensity decreased by 5.10%.

[0083] Example 4 The quantum dot optical plate of Example 1 differs only in that the particle diameter of the first coarse particles is 0.1 mm and the particle diameter of the second coarse particles is 0.1 mm.

[0084] When the brightness and blue light intensity test data was compared with the original model, it was confirmed that the brightness increased by 12.25% and the blue light intensity decreased by 9.11%.

[0085] Example 5 Compared to the quantum dot optical plate of Example 4, the difference is that first quantum dot layer coarse particles and second quantum dot layer coarse particles are laid on both sides of the quantum dot layer, and the first quantum dot layer coarse particles are PS resin powder with a particle size of 0.009 mm, and the second quantum dot layer coarse particles are acrylic resin powder with a particle size of 0.009 mm.

[0086] When the test data for brightness and blue light intensity were compared with the original model, it was found that brightness increased by 14.21% and blue light intensity decreased by 11.37%.

[0087] Example 6 This is different from the quantum dot optical plate of Example 5 in that the particle size of the coarse particles in the first quantum dot layer is 0.12 mm.

[0088] When the test data for brightness and blue light intensity were compared with the original model, it was confirmed that brightness increased by 15.98% and blue light intensity decreased by 14.95%.

[0089] Example 7 This differs from the quantum dot optical plate of Example 5 in that the particle size of the coarse particles in the second quantum dot layer is 0.12 mm.

[0090] When the test data for brightness and blue light intensity were compared with the original model, it was found that brightness increased by 18.19% and blue light intensity decreased by 11.33%.

[0091] Example 8 The quantum dot optical plate of Example 5 differs from the quantum dot optical plate of Example 5 in that the particle size of the coarse particles in the first quantum dot layer is 0.12 mm, and the particle size of the coarse particles in the second quantum dot layer is 0.12 mm.

[0092] When the test data for brightness and blue light intensity were compared with the original model, it was confirmed that brightness increased by 19.95% and blue light intensity decreased by 14.91%.

[0093] (Comparative Example 1) The quantum dot optical plate is configured to include, in this order, a light diffusion layer 5 made of PET resin as a base material, a quantum dot layer 3 made of PS resin as a base material, and a brightness enhancement layer 1 made of PET resin as a base material.

[0094] Here, the refractive index of the light diffusion layer is 1.42, the refractive index of the quantum dot layer is 1.52, and the refractive index of the brightness enhancement layer is 1.59.

[0095] When the brightness and blue light intensity test data was compared with the original model, it was confirmed that the brightness increased by 2.86% and the blue light intensity decreased by 2.98%.

[0096] (Comparative Example 2) The quantum dot optical plate includes, in this order, a light diffusion layer 5 based on PET resin, a quantum dot layer 3 based on PS resin, and a brightness enhancement layer 1 based on PET resin. A first light transition layer 4 is provided between the quantum dot layer 3 and the light diffusion layer 5, and a second light transition layer 2 is provided between the quantum dot layer 3 and the brightness enhancement layer 1. First and second coarse particles are interposed between the light diffusion layer 5 and the first light transition layer 4 and between the brightness enhancement layer 1 and the second light transition layer 2. The first coarse particles have a diameter of 0.008 mm, and the second coarse particles have a diameter of 0.008 mm. The refractive index of the light diffusion layer is 1.59, the refractive index of the first light transition layer is 1.5, the refractive index of the quantum dot layer is 1.52, the refractive index of the second light transition layer is 1.5, and the refractive index of the brightness enhancement layer is 1.59.

[0097] When the brightness and blue light intensity test data was compared with the original model, it was confirmed that the brightness increased by 1.23% and the blue light intensity decreased by 0.98%.

[0098] (Comparative Example 3) Compared to the quantum dot optical plate of Comparative Example 2, the difference is that first quantum dot layer coarse particles and second quantum dot layer coarse particles are laid on both sides of the quantum dot layer, and the first quantum dot layer coarse particles are selected from PS resin powder with a particle size of 0.009 mm, and the second quantum dot layer coarse particles are selected from PS resin powder with a particle size of 0.009 mm.

[0099] When the brightness and blue light intensity test data was compared with the original model, it was confirmed that the brightness increased by 1.99% and the blue light intensity decreased by 2.05%.

[0100] As can be seen from the comparison of the luminance values ​​and the reduction values ​​of blue light intensity between Examples 1 to 8, Comparative Examples 1 to 3, and the original model, the provision of the optical transition layer and coarse particles and the fact that light is always optically Lean Medium Optically from High-concentration media By making the light propagate in this direction, the brightness of the optical plate can be significantly improved and the blue light intensity can be reduced.

[0101] As can be seen from a comparison between Examples 1 to 4 and Examples 5 to 8, by increasing the number of coarse particles in the first and second quantum dot layers, the luminance value of the optical plate can be further increased and the blue light intensity can be further reduced.

[0102] As can be seen from Examples 1 to 8, by optimizing the particle size of the coarse particles, the brightness and blue light blocking performance of the optical plate can be significantly optimized.

Claims

1. A high-brightness blue light-cut quantum dot optical plate including a light diffusion layer, a quantum dot layer, and a brightness improvement layer in this order, a first optical transition layer is provided between the quantum dot layer and the light diffusing layer, and a second optical transition layer is provided between the quantum dot layer and the brightness enhancing layer; the refractive indexes of the light diffusion layer, the first light transition layer, the quantum dot layer, the second light transition layer, and the brightness enhancement layer satisfy the relationship t light diffusion layer≦t first light transition layer≦t quantum dot layer≦t second light transition layer≦t brightness enhancement layer; a first coarse particle and a second coarse particle are disposed between the light diffusion layer and the first light transition layer, and between the brightness improving layer and the second light transition layer, respectively; the first coarse particles have a refractive index that differs from that of the first optical transition layer by less than 0.01; the second coarse particles have a refractive index that differs from that of the brightness enhancing layer by less than 0.01; The particle size range of the first coarse particles is 0.001 to 0.2 mm; The high-brightness blue light-cut quantum dot optical plate, characterized in that the particle size range of the second coarse particles is 0.001 to 0.2 mm.

2. 2. The high brightness blue light blocking quantum dot optical plate according to claim 1, wherein the first optical transition layer has a thickness of 0.01 to 0.25 mm, the second optical transition layer has a thickness of 0.01 to 0.25 mm, and the quantum dot layer has a thickness of 0.1 to 1.0 mm.

3. 3. The high-brightness blue light-blocking quantum dot optical plate according to claim 2, wherein the first optical transition layer has a thickness of 0.01 to 0.15 mm, the second optical transition layer has a thickness of 0.01 to 0.15 mm, and the quantum dot layer has a thickness of 0.1 to 0.7 mm.

4. 2. The high-brightness blue light-blocking quantum dot optical plate according to claim 1, wherein the material of the first coarse particles is the same resin material as the base material of the first optical transition layer.

5. 2. The high-brightness blue light-blocking quantum dot optical plate according to claim 1, wherein the material of the second coarse particles is the same resin material as the base material of the brightness enhancement layer.

6. 2. The high-brightness blue light-cut quantum dot optical plate of claim 1, wherein the first coarse particles have a particle size range of 0.1 to 0.2 mm when the refractive index difference between the light diffusion layer and the first optical transition layer satisfies 0.1≦δt≦0.2, the first coarse particles have a particle size range of 0.01 to 0.2 mm when the refractive index difference between the light diffusion layer and the first optical transition layer satisfies 0.01<δt<0.1, and the first coarse particles have a particle size range of 0.001 to 0.2 mm when the refractive index difference between the light diffusion layer and the first optical transition layer satisfies δt≦0.

01.

7. 2. The high-brightness blue light-cut quantum dot optical plate of claim 1, wherein the second coarse particles have a particle size range of 0.1 to 0.2 mm when the refractive index difference between the brightness enhancing layer and the second optical transition layer satisfies 0.1≦δt≦0.2; the second coarse particles have a particle size range of 0.01 to 0.2 mm when the refractive index difference between the brightness enhancing layer and the second optical transition layer satisfies 0.01<δt<0.1; and the second coarse particles have a particle size range of 0.001 to 0.2 mm when the refractive index difference between the brightness enhancing layer and the second optical transition layer satisfies δt≦0.

01.

8. A first quantum dot layer coarse particle is disposed between the quantum dot layer and the first optical transition layer; and / or 2. The high-brightness blue light-blocking quantum dot optical plate according to claim 1, wherein coarse particles of a second quantum dot layer are disposed between the quantum dot layer and the second optical transition layer.

9. 9. The high-brightness blue-light-cut quantum dot optical plate of claim 8, wherein the first quantum dot layer coarse particles have a refractive index that differs by less than 0.01 from the substrate of the quantum dot layer, and the second quantum dot layer coarse particles have a refractive index that differs by less than 0.01 from the second optical transition layer.

10. 9. The high-brightness blue light-cut quantum dot optical plate of claim 8, wherein the particle size range of the coarse particles in the first quantum dot layer is 0.1 to 0.2 mm when the refractive index difference between the quantum dot layer and the first optical transition layer satisfies 0.1≦δt≦0.2; the particle size range of the coarse particles in the first quantum dot layer is 0.01 to 0.2 mm when the refractive index difference between the quantum dot layer and the first optical transition layer satisfies 0.01<δt<0.1; and the particle size range of the coarse particles in the first quantum dot layer is 0.001 to 0.2 mm when the refractive index difference between the quantum dot layer and the first optical transition layer satisfies δt≦0.

01.

11. 9. The high-brightness blue light-cut quantum dot optical plate of claim 8, wherein the particle size range of the coarse particles of the second quantum dot layer is 0.1 to 0.2 mm when the refractive index difference between the quantum dot layer and the second optical transition layer satisfies 0.1≦δt≦0.2; the particle size range of the coarse particles of the second quantum dot layer is 0.01 to 0.2 mm when the refractive index difference between the quantum dot layer and the second optical transition layer satisfies 0.01<δt<0.1; and the particle size range of the coarse particles of the second quantum dot layer is 0.001 to 0.2 mm when the refractive index difference between the quantum dot layer and the second optical transition layer satisfies δt≦0.

01.

12. 9. The high-brightness blue-light-blocking quantum dot optical plate according to claim 8, wherein the material of the coarse particles of the first quantum dot layer is the same resin material as the base material of the quantum dot layer, and the material of the coarse particles of the second quantum dot layer is the same resin material as the base material of the second optical transition layer.

13. The high brightness blue light blocking quantum dot optical plate according to any one of claims 1 to 12, characterized in that the thickness of the high brightness blue light blocking quantum dot optical plate is 0.2 mm to 2 mm.

14. A method for producing a high-brightness blue light-cut quantum dot optical plate according to any one of claims 1 to 13, Step (1) of measuring the refractive indexes of the quantum dot layer, the light diffusion layer and the brightness enhancement layer, and selecting a photocurable adhesive and / or a hot melt adhesive as a first optical transition layer adhesive and a second optical transition layer adhesive according to the refractive index measurement results; (2) applying an adhesive layer to the quantum dot layer to form a first optical transition layer and a second optical transition layer whose optical refractive index changes; Step (3) of laying first coarse particles on the first optical transition layer and laying second coarse particles on the second optical transition layer; and (4) bonding the light diffusion layer to the first light transition layer, bonding the brightness improvement layer to the second light transition layer, and performing ultraviolet curing and / or thermal curing. A method for manufacturing a high-brightness blue light-cut quantum dot optical plate.

15. Between step (1) and step (2), laying first quantum dot layer coarse particles or second quantum dot layer coarse particles on one side of the quantum dot layer; or 15. The method for manufacturing a high-brightness blue light-cut quantum dot optical plate of claim 14, further comprising the step of laying first quantum dot layer coarse particles and second quantum dot layer coarse particles on both sides of the quantum dot layer, respectively.

16. A backlight module comprising the high-brightness blue-light-cut quantum dot optical plate according to any one of claims 1 to 13.

Images