Integrated optical plate and preparation method and application thereof

Abstract

The invention provides an integrated optical plate and a preparation method and application thereof, and particularly relates to the technical field of optical plates. The integrated optical plate is of a three-layer structure, and the three-layer structure comprises a light diffusion plate on the lower layer, a bonding layer on the middle layer and a composite brightness enhancement film on the upper layer. The bonding layer comprises a base material layer and a structural layer which are arranged in a stacked mode. The three-layer structural design of the light diffusion plate, the bonding layer and the composite brightness enhancement film is adopted, the functions of the optical plate are subjected to hierarchical distribution, and the functional integrity of the optical plate is ensured. Wherein the design of the structural layer ensures the existence of the air layer, so that the multi-layer structure does not influence the brightness of the optical plate; meanwhile, the interface bonding force among the three layers of structures is improved. A user can flexibly match the composite brightness enhancement film on the upper layer according to an actual use scene, so that flexible adaptation of the optical plate in different scenes is realized. In addition, due to the integrated structural design, the cutting frequency is reduced, and the production efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical sheets, and in particular to an integrated optical sheet and its preparation method and application. Background Art

[0002] In light source devices such as displays, a diffusion plate and an optical film, as key optical components, respectively undertake the important functions of light homogenization and brightness enhancement. However, current light source devices usually adopt a method of stacking multiple sheets and films, and in order to fit a display with a specific shape, it is necessary to cut the sheets and films to appropriate sizes and assemble them. This processing method is not only cumbersome and has a long process, but also easily leads to an increase in the material damage rate, thereby greatly increasing the production cost.

[0003] Currently, the prior art mainly prepares a structural plate from a sheet, and then adheres a film to the sheet, and reduces the adverse effects of the adhesive on the air layer through the structural design on the sheet, thereby reducing the brightness loss. However, such methods have the following problems: on the one hand, in order to ensure the existence of the air layer, the thickness of the adhesive layer usually needs to be controlled within 10 μm. However, oxygen in the air layer easily causes oxygen inhibition polymerization of the UV adhesive, thereby causing problems such as poor peel strength; on the other hand, too thin an adhesive layer will also result in insufficient contact area between the adhesive and the sheet, which also affects the peel strength. In addition, too thin an adhesive layer is also prone to introducing gas during the lamination process, resulting in a decrease in the appearance quality of the product.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] One of the purposes of the present invention is to provide an integrated optical sheet, aiming to solve at least one of the above technical problems in the prior art.

[0006] Another purpose of the present invention is to provide a preparation method of an integrated optical sheet.

[0007] A third purpose of the present invention is to provide an application of an integrated optical sheet.

[0008] In order to achieve the above purposes of the present invention, the following technical solutions are specifically adopted:

[0009] The first aspect of the present invention provides an integrated optical sheet having a three-layer structure, and the three-layer structure includes a light diffusion plate in the lower layer, an adhesive layer in the middle layer, and a composite brightness enhancement film in the upper layer;

[0010] The adhesive layer includes a base material layer and a structural layer arranged in a stacked manner.

[0011] Further, the base material layer is arranged on the side close to the light diffusion plate, and the structural layer is arranged on the side close to the composite brightness enhancement film.

[0012] Preferably, the structural layer is disposed on the upper surface of the substrate layer, and the structural layer is composed of an optical structure and an air dielectric layer formed on the surface of the optical structure.

[0013] Preferably, in the structural layer, the optical structures are arranged in an array or discretely.

[0014] Preferably, the optical structure includes a prism structure, a pyramid structure or a column structure.

[0015] Preferably, the material of the substrate layer is biaxially oriented PET.

[0016] Preferably, the grades of the biaxially oriented PET include SKC biaxially oriented PET, Toray biaxially oriented PET, and Mitsubishi biaxially oriented PET.

[0017] Further, the light diffusing plate is a PS light diffusing plate.

[0018] Preferably, the composite brightness enhancement film is a POP type optical film or a MOP type optical film.

[0019] Preferably, the grades of the POP type optical film include LEF300XH-W and LEF200XH-K.

[0020] Preferably, the grades of the MOP type optical film include LEF300M-2S and LEF130M-HS.

[0021] Further, the thickness of the light diffusing plate is 0.7 to 2.0 mm.

[0022] Preferably, the thickness of the adhesive layer is 100 to 200 μm.

[0023] Preferably, the thickness of the composite brightness enhancement film is 100 to 400 μm.

[0024] The second aspect of the present invention provides a method for preparing the integrated optical sheet material, including the following steps:

[0025] A. Micro-recess coating of a first UV adhesive on the substrate layer, and forming a microscopic prism array after the first curing to obtain an adhesive layer;

[0026] B. Coating a second UV adhesive on the lower surface of the substrate layer, close to the light diffusing plate, then laminating the adhesive layer with the light diffusing plate, and removing air using a pressure roller after lamination to obtain an intermediate optical sheet material;

[0027] C. Coating a third UV adhesive on the lower surface of the composite brightness enhancement film, close to the adhesive layer, then laminating the composite brightness enhancement film with the intermediate optical sheet material, and finally obtaining the integrated optical sheet material after the second curing.

[0028] Furthermore, the grades of the first UV glue, the second UV glue, and the third UV glue independently include LOCTITE 3525 or NOA 68 respectively.

[0029] Preferably, the refractive indices of the second UV glue and the third UV glue are independently 1.45 to 1.55.

[0030] Preferably, the viscosities of the second UV glue and the third UV glue are independently 100 to 300 cps.

[0031] Preferably, the coating thickness of the second UV glue is 1 to 3 μm.

[0032] Preferably, the coating thickness of the third UV glue is 1 to 10 μm.

[0033] Preferably, the curing powers of the first curing and the second curing are independently 300 to 800 MJ / m 2 。

[0034] Furthermore, the light diffusing plate is a PS light diffusing plate.

[0035] Preferably, the preparation method of the PS light diffusing plate is: uniformly mixing a polystyrene substrate, an antioxidant, an anti-ultraviolet agent, a flow aid, and a light diffusing agent, and then feeding them into a single-screw extruder to obtain the PS light diffusing plate.

[0036] Furthermore, in the preparation of the PS light diffusing plate, by weight, the polystyrene substrate is 97.5 to 98.7 parts, the antioxidant is 0.2 to 0.5 parts, the anti-ultraviolet agent is 0.2 to 0.5 parts, the flow aid is 0.1 to 0.3 parts, and the light diffusing agent is 0.8 to 1.2 parts.

[0037] Furthermore, the grade of the polystyrene substrate includes at least one of PS133N and PS535N.

[0038] Preferably, the grade of the antioxidant includes at least one of antioxidant 1010, antioxidant 168, and antioxidant 1076.

[0039] Preferably, the grade of the anti-ultraviolet agent includes at least one of anti-ultraviolet agent UV-P, anti-ultraviolet agent UV-770, and anti-ultraviolet agent UV531.

[0040] Preferably, the flow aid includes at least one of zinc stearate and magnesium stearate.

[0041] Preferably, the grade of the light diffusing agent includes at least one of Samsung SL-200M and Dow Corning light diffusing agent 30-424.

[0042] The third aspect of the present invention provides the application of the integrated optical sheet in the preparation of a display or a lighting device.

[0043] Compared with the prior art, the present invention has at least the following beneficial effects:

[0044] The integrated optical sheet provided by the present invention adopts a three-layer structure design of a light diffusing plate, an adhesive layer, and a composite brightness enhancement film, hierarchically allocating the functions of the optical sheet to ensure its functional integrity. Among them, the design of the structural layer ensures the existence of an air layer, so that the multi-layer structure does not affect the brightness of the optical sheet; at the same time, the interfacial bonding force between the three layers of structure is improved. Users can flexibly match the upper composite brightness enhancement film according to the actual use scenario, so as to achieve flexible adaptation of the optical sheet in different scenarios. In addition, the integrated structure design reduces the number of cutting operations, effectively improving the production efficiency.

[0045] The preparation method of the present invention effectively enhances the optical performance of the optical sheet and improves the light utilization rate by microgravure coating the first UV glue and curing to form an adhesive layer. When laminating the light diffusing plate, a pressure roller is used to remove air, ensuring the tightness of the lamination, reducing optical defects, and improving the stability of the product. By coating the third UV glue on the lower surface of the composite brightness enhancement film and laminating it with the optical sheet intermediate, the optical performance of the optical sheet is further optimized, and the brightness enhancement effect is improved. The entire preparation process is simple in process and convenient to operate, effectively improving the production efficiency, reducing the production cost, and providing technical support for the large-scale production of optical sheets.

[0046] Due to the above-mentioned advantages of the integrated optical sheet provided by the present invention, the application of the integrated optical sheet can shorten the processing route of the display or the lighting device, reduce the cost increase caused by the damage of intermediate materials, and improve the production efficiency of the display or the lighting device at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 It is a schematic structural diagram of an integrated optical sheet provided by the present invention.

[0049] Reference numerals: 100 - composite brightness enhancement film; 200 - adhesive layer; 210 - structural layer; 220 - substrate layer; 230 - air medium layer; 300 - light diffusing plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0051] In the following text, the terms "comprising", "having", and their cognates that can be used in various embodiments of the present invention are only intended to represent specific features, numbers, steps, operations, elements, components, or combinations of the foregoing items, and should not be construed as first excluding the existence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing items or increasing the possibility of one or more features, numbers, steps, operations, elements, components, or combinations of the foregoing items.

[0052] The first aspect of the present invention provides an integrated optical sheet, the structural schematic diagram of which is as Figure 1 shown, having a three-layer structure, and the three-layer structure includes a light diffusion plate 300 in the lower layer, an adhesive layer 200 in the middle layer, and a composite brightness enhancement film 100 in the upper layer;

[0053] The adhesive layer 200 includes a substrate layer 220 and a structural layer 210 arranged in a stacked manner.

[0054] The integrated optical sheet provided by the present invention adopts a three-layer structure design of a light diffusion plate, an adhesive layer, and a composite brightness enhancement film, and hierarchically distributes the functions of the optical sheet to ensure its functional integrity. Among them, the design of the structural layer ensures the existence of an air layer, so that the multi-layer structure does not affect the brightness of the optical sheet; at the same time, the interfacial bonding force between the three layers of structure is improved. Users can flexibly match the composite brightness enhancement film in the upper layer according to the actual use scenario, so as to achieve flexible adaptation of the optical sheet in different scenarios. In addition, the integrated structure design reduces the cutting times and effectively improves the production efficiency.

[0055] Further, the substrate layer 220 is disposed on the side close to the light diffusion plate 300, and the structural layer 210 is disposed on the side close to the composite brightness enhancement film 100.

[0056] Preferably, the structural layer 210 is disposed on the upper surface of the substrate layer 220, and the structural layer 210 is composed of an optical structure and an air dielectric layer 230 formed on the surface of the optical structure.

[0057] Preferably, in the structural layer, the optical structures are arranged in an array or discretely arranged.

[0058] Preferably, the optical structure includes a prism structure, a pyramid structure, or a column structure. As Figure 1 shown, the optical structure is a pyramid structure.

[0059] Preferably, the material of the base material layer is dualized PET.

[0060] Preferably, the grades of the dualized PET include SKC dualized PET, Toray dualized PET, and Mitsubishi dualized PET.

[0061] Furthermore, the light diffusing plate is a PS light diffusing plate.

[0062] Preferably, the composite brightness enhancement film is a POP type optical film or a MOP type optical film.

[0063] Preferably, the grades of the POP type optical film include LEF300XH-W and LEF200XH-K.

[0064] Preferably, the grades of the MOP type optical film include LEF300M-2S and LEF130M-HS.

[0065] Furthermore, the thickness of the light diffusing plate is 0.7 - 2.0 mm.

[0066] Typical but non-limiting, the thickness of the light diffusing plate can be, for example, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, or 2.0 mm, or any value within the range of 0.7 mm - 2.0 mm.

[0067] Preferably, the thickness of the adhesive layer is 100 - 200 μm.

[0068] Typical but non-limiting, the thickness of the adhesive layer can be, for example, 100 μm, 120 μm, 140 μm, 160 μm, 180 μm, or 200 μm, or any value within the range of 100 μm - 200 μm.

[0069] Preferably, the thickness of the composite brightness enhancement film is 100 - 400 μm.

[0070] Typical but non-limiting, the thickness of the composite brightness enhancement film can be, for example, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, or 400 μm, or any value within the range of 100 μm - 400 μm.

[0071] The second aspect of the present invention provides a method for preparing the integrated optical sheet material, including the following steps:

[0072] A. Micro-recess coating of the first UV adhesive on the base material layer, and forming a microscopic prism array after the first curing to obtain the adhesive layer;

[0073] B. Coat a second UV glue on one side of the lower surface of the base material layer, close to the light diffusing plate, and then bond the bonding layer to the light diffusing plate. After bonding, use a pressing roller to remove air to obtain an intermediate optical sheet material;

[0074] C. Coat a third UV glue on one side of the lower surface of the composite brightness enhancement film, close to the bonding layer, and then bond the composite brightness enhancement film to the intermediate optical sheet material. Finally, obtain the integrated optical sheet material after the second curing.

[0075] The preparation method of the present invention effectively enhances the optical performance of the optical sheet material and improves the light utilization rate by microgravure coating the first UV glue and curing to form a bonding layer. When bonding the light diffusing plate, a pressing roller is used to remove air, ensuring the tightness of the bonding, reducing optical defects, and improving the stability of the product. By coating the third UV glue on the lower surface of the composite brightness enhancement film and bonding it to the intermediate optical sheet material, the optical performance of the optical sheet material is further optimized, and the brightness enhancement effect is improved. The entire preparation process has a simple process and convenient operation, effectively improving production efficiency and reducing production costs, providing technical support for the large-scale production of optical sheet materials.

[0076] During microgravure coating, an engraved gravure roll with a fine pattern is used. The surface of the roll has many tiny pits or grooves, and the shape, size, and arrangement of these pits can be precisely designed according to the specific optical structure. During the coating process, the gravure roll dips the UV glue from the coating liquid tank and then transfers the UV glue to the surface of the base material layer by contacting the base material layer. Since the pits on the gravure roll can precisely control the amount and distribution of the UV glue, a uniform and patterned micro prism array can be formed on the base material layer.

[0077] Further, the grades of the first UV glue, the second UV glue, and the third UV glue each independently include LOCTITE 3525 or NOA 68.

[0078] Preferably, the refractive indices of the second UV glue and the third UV glue each independently are 1.45 to 1.55.

[0079] Preferably, the viscosities of the second UV glue and the third UV glue each independently are 100 to 300 cps.

[0080] Preferably, the coating thickness of the second UV glue is 1 to 3 μm.

[0081] Typically but not restrictively, the coating thickness of the second UV glue can be, for example, 1 μm, 1.5 μm, 2.0 μm, 2.5 μm, or 3.0 μm, or any value within the range of 1.0 μm to 3.0 μm.

[0082] Preferably, the coating thickness of the third UV glue is 1 to 10 μm.

[0083] Typically but not limited thereto, the coating thickness of the third UV glue can be, for example, 1 μm, 3 μm, 5 μm, 7 μm, 9 μm or 10 μm, or any value within the range of 1 μm to 10 μm.

[0084] Preferably, the curing power of the first curing and the second curing is independently 300 to 800 MJ / m 2 .

[0085] Typically but not limited thereto, the curing power of the first curing and the second curing can be, for example, 300 MJ / m 2 , 400 MJ / m 2 , 500 MJ / m 2 , 600 MJ / m 2 , 700 MJ / m 2 or 800 MJ / m 2 , or any value within the range of 300 MJ / m 2 to 800 MJ / m 2 range.

[0086] Furthermore, the light diffusing plate is a PS light diffusing plate.

[0087] Preferably, the preparation method of the PS light diffusing plate is: mixing a polystyrene substrate, an antioxidant, an anti-ultraviolet agent, a flow aid and a light diffusing agent evenly and then feeding them into a single-screw extruder to obtain the PS light diffusing plate.

[0088] Furthermore, in the preparation of the PS light diffusing plate, by weight, 97.5 to 98.7 parts of polystyrene substrate, 0.2 to 0.5 parts of antioxidant, 0.2 to 0.5 parts of anti-ultraviolet agent, 0.1 to 0.3 parts of flow aid and 0.8 to 1.2 parts of light diffusing agent.

[0089] Typically but not restrictively, in the preparation of the PS light diffusing plate, the weight parts of the polystyrene substrate can be, for example, 97.5 parts, 98.0 parts, 98.5 parts or 98.7 parts, or can also be any value within the range of 97.5 parts to 98.7 parts. The weight parts of the antioxidant can be, for example, 0.2 parts, 0.3 parts, 0.4 parts or 0.5 parts, or can also be any value within the range of 0.2 parts to 0.5 parts. The weight parts of the ultraviolet absorber can be, for example, 0.2 parts, 0.3 parts or 0.5 parts, or can also be any value within the range of 0.2 parts to 0.5 parts. The weight parts of the flow aid can be, for example, 0.1 parts, 0.2 parts or 0.3 parts, or can also be any value within the range of 0.1 parts to 0.3 parts. The weight parts of the light diffusing agent can be, for example, 0.8 parts, 0.9 parts, 1.0 parts, 1.1 parts or 1.2 parts, or can also be any value within the range of 0.8 parts to 1.2 parts.

[0090] Further, the grades of the polystyrene substrate include at least one of PS133N and PS535N.

[0091] Preferably, the grades of the antioxidant include at least one of antioxidant 1010, antioxidant 168 and antioxidant 1076.

[0092] Preferably, the grades of the ultraviolet absorber include at least one of ultraviolet absorber UV-P, ultraviolet absorber UV-770 and ultraviolet absorber UV531.

[0093] Preferably, the flow aid includes at least one of zinc stearate and magnesium stearate.

[0094] Preferably, the grades of the light diffusing agent include at least one of Samsung SL-200M in South Korea and Dow Corning light diffusing agent 30-424.

[0095] The third aspect of the present invention provides the application of the integrated optical sheet in the preparation of a display or a lighting device.

[0096] Regarding the application of the integrated optical sheet provided by the present invention, in view of the advantages of the above integrated optical sheet, it can shorten the processing route of the display or the lighting device, reduce the cost increase caused by the damage of the intermediate material, and at the same time improve the production efficiency of the display or the lighting device.

[0097] The present invention will be further described below through specific examples and comparative examples. However, it should be understood that these examples are only for more detailed description and should not be construed as limiting the present invention in any form. For the raw materials used in the examples and comparative examples of the present invention, if no specific conditions are indicated, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments whose manufacturers are not indicated, they are all conventional products that can be obtained through commercial purchase.

[0098] The preparation method of the PS light diffusion plates used in the examples and comparative examples is as follows: 98 parts of polystyrene substrate (PS133N - Tianjin Rantai), 0.3 parts of antioxidant (antioxidant 1010), 0.1 part of antioxidant 168, 0.3 parts of anti-ultraviolet agent (anti-ultraviolet agent UV-P), 0.1 part of anti-ultraviolet agent UV-770, 0.2 parts of flow aid (zinc stearate), and 1 part of light diffusing agent (SL200M) are put into a blender and mixed evenly, and then extruded by a single-screw extruder to prepare a PS light diffusion plate with a smooth upper surface and a thickness of 1.0 mm.

[0099] Example 1

[0100] This example provides an integrated optical sheet, and the preparation method is as follows:

[0101] 1. Double-sided PET (SKC double-sided PET, 0.05 mm thick) is used as the substrate layer. UV glue (NOA 68) is applied by microgravure coating, and then cured under 500 MJ / m 2 to obtain a structure layer. The optical structure in the structure layer is a one-high-five-low prism array structure, the height of the high prism is 70 μm, and the height of the low prism is 60 μm. (Abbreviated as 70 / 60 μm, 1H5L). Finally, an adhesive layer with a thickness of 120 μm is obtained.

[0102] 2. 2 μm of UV glue (NOA68) is coated on the side of the substrate layer away from the structure layer. The UV glue is adhered to the PS light diffusion plate, and the air is removed by a pressure roller and then cured. The curing power is 500 MJ / m 2 to obtain an optical sheet intermediate.

[0103] 3. 1 μm of UV glue (NOA68) is coated on the lower surface of a commercial optical film (POP, model LEF300XH-W). It is adhered to the upper structure layer of the optical sheet intermediate and cured. The curing power is 500 MJ / m 2 to obtain an integrated optical sheet.

[0104] Example 2

[0105] This example provides an integrated optical sheet, and the preparation method is as follows:

[0106] 1. The same as this step in Example 1.

[0107] 2. The same as this step in Example 1.

[0108] 3. 1 μm of UV glue (NOA 68) is coated on the lower surface of a commercial optical film (MOP, LEF300M-2S). It is adhered to the upper structure layer of the optical sheet intermediate and cured. The curing power is 500 MJ / m 2, an integrated optical sheet is obtained.

[0109] Example 3

[0110] This example provides an integrated optical sheet, and the preparation method is as follows:

[0111] 1. Use double-sided PET (SKC double-sided PET, 0.05 mm thick) as the substrate layer, apply UV glue (NOA 68) using microgravure coating, and then cure it under 500 MJ / m 2 to obtain the structure layer. The optical structure in the structure layer is a one-high-one-low prism array structure, the height of the high prism is 60 μm, and the height of the low prism is 54 μm. (Abbreviated as 60 / 54 μm, 1H1L), and finally the adhesive layer is obtained, with a thickness of 110 μm.

[0112] 2. The same step as in Example 1.

[0113] 3. The same step as in Example 1.

[0114] Example 4

[0115] This example provides an integrated optical sheet, and the preparation method is as follows:

[0116] 1. The same step as in Example 3.

[0117] 2. The same step as in Example 3.

[0118] 3. Coat 1 μm of UV glue (NOA 68) on the lower surface of the commercial optical film (MOP, LEF300M-2S), bond it to the structure layer on the optical sheet intermediate, and cure it. The curing power is 500 MJ / m 2 , to obtain an integrated optical sheet.

[0119] Example 5

[0120] This example provides an integrated optical sheet, and the preparation method is as follows:

[0121] 1. Use double-sided PET (Toray double-sided PET, 0.05 mm thick) as the substrate layer, apply UV glue (LOCTITE 3525) using microgravure coating, and then cure it under 500 MJ / m 2 to obtain the structure layer. The optical structure in the structure layer is a column structure arranged in a dot matrix, the height of the column is 60 μm, and finally the adhesive layer is obtained, with a thickness of 110 μm.

[0122] 2. The same step as in Example 1.

[0123] 3. The same step as in Example 1.

[0124] Example 6

[0125] This embodiment provides an integrated optical sheet, and the preparation method is as follows:

[0126] 1. Use double-chemical PET (Mitsubishi double-chemical PET, 0.05 mm thick) as the substrate layer, apply UV glue (NOA68) using microgravure coating, and then cure it at 600 MJ / m 2 to obtain a structure layer. The optical structure in the structure layer is a pyramid array structure, the height of the pyramid is 60 μm, and finally an adhesive layer with a thickness of 110 μm is obtained.

[0127] 2. Coat 2 μm of UV glue (NOA68) on the side of the substrate layer away from the structure layer, bond the UV glue with a PS light diffusing plate, remove air with a pressure roller and then cure it, and the curing power is 600 MJ / m 2 to obtain an optical sheet intermediate.

[0128] 3. Coat 1 μm of UV glue (NOA 68) on the lower surface of a commercial optical film (POP, model LEF200XH-K), bond it with the upper structure layer of the optical sheet intermediate and cure it, and the curing power is 600 MJ / m 2 to obtain an integrated optical sheet.

[0129] Example 7

[0130] This embodiment provides an integrated optical sheet. Different from Example 1, the thickness of the UV glue in step 2 is 3 μm, and the thickness of the UV glue in step 3 is 10 μm. The remaining raw materials and preparation methods are the same as those in Example 1 and will not be elaborated here.

[0131] Example 8

[0132] This embodiment provides an integrated optical sheet. Different from Example 1, the thickness of the UV glue in step 2 is 1 μm, and the thickness of the UV glue in step 3 is 1 μm. The remaining raw materials and preparation methods are the same as those in Example 1 and will not be elaborated here.

[0133] Comparative Example 1

[0134] This comparative example provides an optical plate, and the preparation method is as follows:

[0135] 1. When preparing a PS light diffusing plate, press a one-high-five-low prism structure on the surface through a pressure roller after extrusion. The height of the high prism is 70 μm, and the height of the low prism is 60 μm. (Abbreviated as 70 / 60 μm, 1H5L) to obtain a PS light diffusing structural plate.

[0136] 2. Coat 2 μm of UV glue (NOA 68) on the lower surface of the commercial optical film (POP, model LEF300XH-W), bond it to the structural side of the PS light diffusion structure board, and then cure it. The curing power is 500 MJ / m 2 , obtaining an optical board.

[0137] Comparative Example 2

[0138] This comparative example provides an optical board, and the preparation method is as follows:

[0139] 1. The same as that step in Comparative Example 1.

[0140] 2. Coat 4 μm of UV glue (NOA 68) on the lower surface of the commercial optical film (POP, model LEF300XH-W), bond it to the structural side of the PS light diffusion structure board, and then cure it. The curing power is 500 MJ / m 2 , obtaining an optical board.

[0141] Comparative Example 3

[0142] This comparative example provides an optical board, and the preparation method is as follows:

[0143] 1. The same as that step in Comparative Example 1.

[0144] 2. Coat 20 μm of UV glue (NOA 68) on the lower surface of the commercial optical film (POP, model LEF300XH-W), bond it to the structural side of the PS light diffusion structure board, and then cure it. The curing power is 500 MJ / m 2 , obtaining an optical board.

[0145] Comparative Example 4

[0146] This comparative example provides an optical board material, and the preparation method is as follows:

[0147] 1. The same as that step in Example 1.

[0148] 2. Stack the three-layer structure directly in the order of the commercial optical film (POP, model LEF300XH-W), the adhesive layer, and the PS light diffusion board to obtain the optical board material.

[0149] Comparative Example 5

[0150] This comparative example provides an optical board material, which is obtained by directly stacking the commercial optical film (POP, model LEF300XH-W) and the PS light diffusion board.

[0151] Test Example

[0152] Perform luminance testing, peel strength testing, and appearance testing on the boards obtained in the examples and comparative examples.

[0153] Luminance test: Use a 32-inch white light source, cut the board into 32 inches, place it above the light source, and use a luminance meter CA-410 to measure the luminance.

[0154] Peel strength test: Cut the board into A4-size samples, and use a blade to cut the film material into 25-mm-wide strips along the TD direction. Then peel half of the strips from the board along the TD direction. Next, use a tensile testing machine to clamp the peeled board at the bottom and the peeled film material at the top. The peeling angle is 180° (the peeling angle is the angle between the direction of the peel force and the plane of the material being peeled). Measure the load required when continuously peeling the strips at a speed of 25 mm / min, with the unit g / 25 mm.

[0155] During the appearance test, inspect the appearance of the board and observe whether there are air holes on the surface of the board.

[0156] Record the obtained data in Table 1.

[0157] Table 1

[0158] <![CDATA[Luminance (cd / m 2 )]]> Peeling force (g / 25mm) Appearance Example 1 4968.6 978 No pores Example 2 4482 1013 No pores Example 3 4912 972 No pores Example 4 4434 1024 No pores Example 5 4983.1 987 No pores Example 6 4932.7 953 No pores Example 7 4934.5 1115 No pores Example 8 4998.2 597 No pores Comparative Example 1 4859 52 Large-area pores Comparative Example 2 4477 127 Large-area pores Comparative Example 3 4171 1145 No pores Comparative Example 4 4180 0 No pores Comparative Example 5 5457 0 No pores

[0159] The peel strength data of the examples is the peel strength between the adhesive layer and the PS light diffusing plate; the peel strength of Comparative Examples 1-3 is the peel strength between the optical film and the PS light diffusing plate.

[0160] Using the method of laminating with the bonding layer, the luminance only decreases by 10% compared to directly placing without using the bonding layer (Comparative Example 5). However, at this time, the film material and the board have become an integral material, and at the same time, the peel strength reaches more than 900 g / 25 mm, fully meeting the usage requirements. At the same time, compared with directly fabricating the structure on the surface of the board and then laminating (Comparative Examples 1 and 2), the luminance is improved, and at the same time, the peel strength is greatly improved, and there are no obvious appearance defects. Compared with directly laminating on the surface of the structural board (Comparative Example 3), the luminance is greatly improved.

[0161] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, and are not intended to limit it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements for some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An integrated optical plate, characterized in that: It has a three-layer structure, which includes a light diffusion plate at a lower layer, an adhesive layer at a middle layer, and a composite brightness enhancement film at an upper layer; The adhesive layer includes a base material layer and a structural layer which are stacked.

2. The integrated optical plate according to claim 1, characterized in that: The substrate layer is arranged on a side close to the light diffusion plate, and the structural layer is arranged on a side close to the composite brightness enhancement film; Preferably, the structural layer is disposed on the upper surface of the substrate layer, and the structural layer is composed of an optical structure and an air medium layer formed on the surface of the optical structure; Preferably, in the structural layer, the optical structures are arranged in an array or in a discrete manner; Preferably, the optical structure comprises a prism structure, a pyramid structure or a column structure; Preferably, the material of the substrate layer is double-layered PET; Preferably, the brands of the dual-chemical PET include SKC dual-chemical PET, Toray dual-chemical PET, and Mitsubishi dual-chemical PET.

3. The integrated optical plate according to claim 1, characterized in that: The light diffuser plate is a PS light diffuser plate; Preferably, the composite brightness enhancement film is a POP type optical film or a MOP type optical film; Preferably, the brands of the POP type optical film include LEF300XH-W and LEF200XH-K; Preferably, the brands of the MOP type optical film include LEF300M-2S and LEF130M-HS.

4. The integrated optical plate according to any one of claims 1 to 3, characterized in that: The thickness of the light diffuser plate is 0.7 to 2.0 mm; Preferably, the thickness of the adhesive layer is 100 to 200 μm; Preferably, the composite brightness enhancement film has a thickness of 100-400 μm.

5. A method for preparing the integrated optical plate according to any one of claims 1 to 4, characterized in that: The following steps are involved: A. Applying a first UV adhesive on the substrate layer in a micro-concave manner, and forming a microscopic prism array to obtain an adhesive layer after a first curing process; B. Applying a second UV adhesive on the lower surface of the substrate layer, close to the light diffuser plate, and then laminating the adhesive layer to the light diffuser plate. After laminating, a pressure roller is used to remove air to obtain an optical plate intermediate piece. C. Apply a third UV adhesive on the lower surface of the composite brightness enhancement film, close to the adhesive layer, and then bond the composite brightness enhancement film to the optical plate intermediate piece, and finally obtain the integrated optical plate after a second curing.

6. The preparation method according to claim 5, characterized in that: The brands of the first UV glue, the second UV glue and the third UV glue are independently LOCTITE 3525 or NOA68; Preferably, the refractive index of the second UV glue and the third UV glue is independently 1.45 to 1.55; Preferably, the viscosity of the second UV glue and the third UV glue is independently 100-300 cps; Preferably, the coating thickness of the second UV glue is 1 to 3 μm; Preferably, the coating thickness of the third UV glue is 1 to 10 μm; Preferably, the curing powers of the first curing and the second curing are independently 300-800 MJ / m 2 .

7. The preparation method according to claim 5, characterized in that: The light diffuser plate is a PS light diffuser plate; Preferably, the preparation method of the PS light diffuser plate is as follows: a polystyrene substrate, an antioxidant, an anti-ultraviolet agent, a flow aid and a light diffuser are uniformly mixed and then put into a single screw extruder to obtain the PS light diffuser plate.

8. The preparation method according to claim 7, characterized in that: According to weight percentage, the polystyrene substrate is 97.5-98.7 parts, the antioxidant is 0.2-0.5 parts, the anti-ultraviolet agent is 0.2-0.5 parts, the flow aid is 0.1-0.3 parts and the light diffuser is 0.8-1.2 parts.

9. The preparation method according to claim 7, characterized in that: The grades of the polystyrene substrate include at least one of PS133N and PS535N; Preferably, the brand of the antioxidant includes at least one of antioxidant 1010, antioxidant 168, and antioxidant 1076; Preferably, the brand of the anti-ultraviolet agent includes at least one of anti-ultraviolet agent UV-P, anti-ultraviolet agent UV-770, and anti-ultraviolet agent UV531; Preferably, the flow aid comprises at least one of zinc stearate and magnesium stearate; Preferably, the brand of the light diffuser includes at least one of Samsung SL-200M from South Korea and Dow Corning light diffuser 30-424.

10. Use of the integrated optical plate according to any one of claims 1 to 4 in the preparation of displays or lighting equipment.

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