Diffusion-plate-free laminating film for liquid crystal display

Abstract

The invention discloses a diffusion-plate-free laminating film for a liquid crystal display, and aims to overcome the defect that an existing optical film and a backlight module depend on a diffusion plate. The film comprises a first structural layer film, a second structural layer film, a third structural layer film and a fourth structural layer film, the first structural layer film comprises a base film and a micro-convex structural layer, the second structural layer film, the third structural layer film and the fourth structural layer film comprise base films and third structural layer film part prism layers, and each third structural layer film part prism layer is formed by continuously arranging a plurality of third structural layer film part prisms; the bottom of the first structural layer film, the bottom of the second structural layer film and the bottom of the third structural layer film are provided with composite adhesive layers, the bottom of the fourth structural layer film is provided with a back coating, PBMA or PMMA microspheres are arranged in the back coating and the composite adhesive layers, the composite adhesive layers adhere to the adjacent structural layer films, and the back coating at the bottom of the fourth structural layer film is connected with panel glass. A diffusion plate is omitted, the cost is reduced, and the thickness is smaller.

Description

Technical Field

[0001] The present invention relates to the display field, and more particularly to a diffusion-free plate-type laminating film for a liquid crystal display. Background Art

[0002] With the popularization of TFT-LCD liquid crystal display technology, the demand for its backlight module and related optical films is also increasing. The previously used diffusion plate, 90-degree light enhancement, 0-degree light enhancement, and three-film structure are gradually replaced by two or even one multi-layer composite film. With the increasing size, the stiffness requirements are getting higher, the products are getting thinner, and the assembly line has become more and more simple for film assembly. DOP+DP (diffusion film lamination light enhancement + diffusion plate), POP+DP (light enhancement lamination light enhancement + diffusion plate), P+P+DP (light enhancement + light enhancement + diffusion plate) have appeared. In addition to providing light diffusion effect, the diffusion plate also serves as a rigid structure to support the film.

[0003] Among them, the material cost and assembly cost of the diffuser itself account for a large proportion of the entire backlight module. The existence of the diffuser increases the overall thickness of the structure. In addition, the diaphragm needs to be cut before it can be assembled and used. An extra layer of diaphragm requires one more cutting and one more packaging cost. For large-size display screens, the larger the diffuser, the more cost and thickness it brings. This not only increases the material cost, but also increases the labor cost of assembling the diaphragm. In addition, due to multiple packaging, transportation and assembly, the product is prone to scratches, foreign matter and other defects, which leads to a decrease in production and assembly yield, and ultimately leads to high costs. Summary of the invention

[0004] The invention overcomes the deficiency of existing optical films and backlight modules that rely on diffusion plates, and provides a diffusion-free plate-type laminating film for liquid crystal displays, which can achieve the effects of reducing costs and thickness.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A diffusion-free plate-type laminating film for a liquid crystal display comprises a first structural layer film, a second structural layer film, a third structural layer film and a fourth structural layer film arranged in sequence from top to bottom; The first structural layer film comprises a first structural layer film portion base film and a first structural layer film micro-convex structural layer arranged on the upper surface of the first structural layer film portion base film, wherein the first structural layer film micro-convex structural layer comprises a plurality of PBMA or PMMA micro beads; The second structural layer film comprises a second structural layer film portion base film and a second structural layer film portion prism layer arranged on an upper surface of the second structural layer film portion base film, wherein the second structural layer film portion prism layer is formed by a plurality of second structural layer film portion prisms being continuously arranged; The third structural layer film comprises a third structural layer film portion base film and a third structural layer film portion prism layer arranged on the upper surface of the third structural layer film portion base film, wherein the third structural layer film portion prism layer is formed by a plurality of third structural layer film portion prisms arranged continuously; The fourth structural layer film comprises a fourth structural layer film base film and a fourth structural layer film base film prism layer arranged on the upper surface of the fourth structural layer film base film, and the fourth structural layer film portion prism layer is formed by a plurality of fourth structural layer film portion prisms arranged continuously; A composite adhesive layer is provided at the bottom of the first structural layer film, the second structural layer film and the third structural layer film, a back coating layer is provided at the bottom of the fourth structural layer film, PBMA or PMMA microbeads are provided in the back coating layer and the composite adhesive layer, the composite adhesive layer bonds adjacent structural layer films, and the back coating layer at the bottom of the fourth structural layer film is connected to the panel glass.

[0006] The fourth structural layer of the present invention can function as a diffusion plate and an existing light-enhancing layer, the second structural layer and the third structural layer can function as light-enhancing layers, and the first structural layer can improve the rigidity of the present invention and further diffuse the light. Thus, a multi-layered film replaces the existing structure of assembling a diffusion plate with multiple films. The present invention eliminates the need for a diffusion plate, thereby reducing the thickness of the product, and the rigidity can meet the requirements.

[0007] A composite adhesive layer is arranged between each structural layer film, a back coating is provided on the back of the fourth structural layer film, and PBMA or PMMA microbeads are added to the composite adhesive layer and the back coating layer, and the PBMA or PMMA microbeads are used to improve the diffusion effect and the haze.

[0008] This laminating film eliminates the need for a diffusion plate and is directly laminated to the OC (opencell, liquid crystal panel), which can reduce raw material costs and process costs, and reduce the thickness of the final module.

[0009] Preferably, the cross section of the fourth structural layer film portion prism along the length direction of the fourth structural layer film base film is an isosceles right triangle, and the axial direction of the fourth structural layer film portion prism and the width direction of the fourth structural layer film base film are provided with an angle, and the angle of the angle is , the spacing between adjacent fourth structural layer film prisms is 200-220um, the bottom width of the fourth structural layer film prism is 80um, the height is 40um, and the vertex angle is between 88°-90°. By setting the turning angle, the axis of the fourth structural layer film prism and the second structural layer film prism and the third structural layer film prism have an angle, which can effectively reduce the risk of interference between the upper and lower prisms. While improving the brightness, it can also improve the shielding of the product.

[0010] As a preference, . This value is the preferred value.

[0011] Preferably, the axial section of the film portion prism of the third structural layer is an isosceles right triangle, the lower base width of the isosceles right triangle is between 60-70 um, the height is between 30-35 microns, and the vertex angle is between 96-98°.

[0012] Preferably, the axial section of the prism of the film portion of the second structural layer is an isosceles right triangle, the lower base width of the isosceles right triangle is between 60-70 microns, the height is between 30-35 microns, and the vertex angle is between 96-98°.

[0013] Preferably, the surface of the fourth structural layer membrane prism is provided with an atomization structure, and the atomization structure includes a plurality of semi-convex balls randomly distributed on the sides of the fourth structural layer membrane prism. The atomization structure further improves the diffusion effect, and the semi-convex balls with inconsistent heights and diameters are used to improve the atomization effect.

[0014] Preferably, the particle size of the PMMA or PBMA microbeads is between 2 and 5 microns.

[0015] Preferably, the angle between the prism of the film portion of the fourth structural layer and the prism of the film portion of the third structural layer is ; The angle between the prism of the fourth structural layer and the prism of the second structural layer is This structure reduces the risk of interference between the upper and lower prisms.

[0016] Preferably, the height of the micro-convex structure layer of the first structure layer film is between 5-10 um.

[0017] Preferably, the first structure layer membrane base film, the second structure layer membrane base film and the third structure layer membrane base film are 100um optical grade PET films; the fourth structure layer membrane base film is 100um-188um optical grade PET film. The thickness of the first structure layer membrane base film, the second structure layer membrane base film, the third structure layer membrane base film and the fourth structure layer membrane base film is thicker than the corresponding film in the module with a diffuser plate, but by reducing the diffuser plate, the total thickness is finally reduced.

[0018] Compared with the prior art, the beneficial effects of the present invention are: ensuring brightness and shielding, while reducing costs and manual assembly costs during subsequent use (the existing multi-layer film structure requires multiple assembly by personnel; while the film of the present technical solution only needs to be assembled once); there is no diffusion plate, the thickness is thin, and the thickness can be reduced by 29% compared with the structure requiring a diffusion plate; the production cost of the bonding film for the liquid crystal display of the present invention is about 20% lower than the material cost of the existing structure requiring a diffusion plate; at the same time, the assembly cost of the terminal manufacturer is greatly reduced; the finished product packaging and transportation costs of the present technical solution are also reduced compared with the existing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the present invention in a split state; Figure 2 is a top view of the fourth structural layer film of the present invention; In the figure: The first structural layer film 1, the first structural layer film base film 11, the first structural layer film micro-convex structural layer 12, the second structural layer film 2, the second structural layer film base film 21, the second structural layer film prism layer 22, the second structural layer film prism 221, the third structural layer film 3, the third structural layer film base film 31, the third structural layer film prism layer 32, the third structural layer film prism 321, the fourth structural layer film 4, the fourth structural layer film base film 41, the fourth structural layer film base film prism layer 42, the fourth structural layer film prism 421, the semi-convex ball 422, the composite adhesive layer 5, and the back coating layer 6. DETAILED DESCRIPTION

[0020] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0021] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure and should not be understood as limitations on the present disclosure.

[0024] In the present disclosure, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances, and they cannot be understood as limitations on the present disclosure.

[0025] Example: A diffusion-free plate-type laminating film for liquid crystal display, reference Figure 1 As shown, it includes a first structural layer film 1, a second structural layer film 2, a third structural layer film 3 and a fourth structural layer film 4 which are arranged in sequence from top to bottom.

[0026] The first structural layer film 1 includes a first structural layer film base film 11 and a first structural layer film micro-convex structure layer 12 arranged on the upper surface of the first structural layer film base film 11. The first structural layer film base film 11 is a 100um optical grade PET film. The first structural layer film micro-convex structure layer 12 includes a plurality of PBMA or PMMA micro-beads. The structure height of the PBMA or PMMA micro-beads in the first structural layer film micro-convex structure layer 12 is 5-10 microns.

[0027] The bottom of the first structural layer membrane base film 11 is provided with a composite adhesive layer 5, which is formed by glue and connected to the top of the second structural layer membrane 2. The composite adhesive layer 5 is provided with PBMA or PMMA microbeads with a particle size of 2-5 microns, so that the haze of the composite adhesive layer 5 reaches 3%-60%. The first structural layer membrane base film 11 is bonded to the second structural layer membrane 2 through the glue layer.

[0028] The second structural layer film 2 includes a second structural layer film base film 21 and a second structural layer film prism layer 22 disposed on the upper surface of the second structural layer film base film 21, and the second structural layer film base film 21 is a 100um optical grade PET film. The second structural layer film prism layer 22 is formed by a plurality of second structural layer film prisms 221 arranged in a row. The axial section of the second structural layer film prism 221 is an isosceles right triangle, the lower base width of the isosceles right triangle is between 60-70 microns, the height is between 30-35 microns, and the vertex angle is between 96-98°.

[0029] The bottom of the second structural layer membrane base film 21 is provided with a composite adhesive layer 5, which is formed by glue and connected to the top of the third structural layer membrane 3. The composite adhesive layer 5 is provided with PBMA or PMMA microbeads with a particle size of 2-5 microns, so that the haze of the composite adhesive layer 5 reaches 3%-60%.

[0030] The third structural layer film 3 includes a third structural layer film base film 31 and a third structural layer film prism layer 32 arranged on the upper surface of the third structural layer film base film 31. The third structural layer film base film 31 is a 100um optical grade PET film. The third structural layer film prism layer 32 is formed by a plurality of third structural layer film prisms 321 arranged in a row. The axial section of the third structural layer film prism 321 is an isosceles right triangle, the lower base width of the isosceles right triangle is between 60-70um, the height is between 30-35 microns, and the vertex angle is between 96-98°.

[0031] A composite adhesive layer 5 is provided at the bottom of the third structural layer membrane base film 31, the composite adhesive layer 5 is formed by glue, and the composite adhesive layer 5 is connected to the top of the fourth structural layer membrane 4. PBMA or PMMA micro beads are provided in the composite adhesive layer 5, and the particle size is 2-5 microns, so that the haze of the composite adhesive layer 5 reaches 3%-60%.

[0032] Ginseng Figure 1 , 2 As shown, the fourth structural layer film 4 includes a fourth structural layer film base film 41 and a fourth structural layer film base film prism layer 42 arranged on the upper surface of the fourth structural layer film base film 41, and the fourth structural layer film base film 4 is a 100um-188um optical grade PET film. The fourth structural layer film prism 421 layer is formed by a plurality of fourth structural layer film prisms 421 arranged continuously; The cross section of the fourth structural layer film portion prism 421 along the length direction of the fourth structural layer film base film 41 is an isosceles right triangle, and the axial direction of the fourth structural layer film portion prism 421 and the width direction of the fourth structural layer film base film 41 are provided with an angle, and the angle of the angle is , , the spacing between adjacent fourth structural layer film prisms 421 is 200-220um, and in some preferred embodiments is 210um, the bottom width of the fourth structural layer film prism 421 is 80um, and the height is 40um. By setting the angle, the axis of the fourth structural layer film 4 prism and the second structural layer film 2 prism and the third structural layer film 3 prism have an angle, which can effectively reduce the risk of interference between the upper and lower prisms. While improving the brightness, it can also improve the shielding of the product. In some preferred schemes, The angle between the fourth structural layer film part prism 421 and the third structural layer film part prism 321 is The angle between the fourth structural layer film prism 421 and the second structural layer film prism 221 is This structure reduces the risk of interference between the upper and lower prisms.

[0033] The surface of the fourth structural layer membrane prism 421 is provided with an atomization structure, which includes a plurality of semi-convex balls 422 randomly distributed on the sides of the fourth structural layer membrane prism 421. The atomization structure further improves the diffusion effect, and the semi-convex balls 422 with inconsistent heights and diameters are used to improve the atomization effect.

[0034] The fourth structural layer film base film prism layer 42 is formed by roll pressing. The processing steps of the base roller used for forming include: electroplating copper on the base roller surface, flattening with an ultra-precision lathe, engraving an isosceles triangle structure with an ultra-precision lathe and a diamond knife, and then using aluminum oxide chips to evenly spray on the surface of the isosceles triangle structure to form an uneven atomized structure.

[0035] The bottom of the fourth structural layer film base film 41 is provided with a back coating layer 6, which is formed by glue, and the back coating layer 6 is provided with PBMA or PMMA micro beads with a particle size of 2-5 microns, so that the haze of the composite adhesive layer 5 reaches between 90% and 98%. The back coating layer 6 is used to connect with the panel glass.

[0036] The fourth structural layer film 4 of the present technical solution can play the role of a diffusion plate and the role of an existing light-enhancing layer, the second structural layer film 2 and the third structural layer film 3 play the role of light-enhancing, and the first structural layer film 1 plays the role of improving the rigidity of the present invention and further diffusing. Thus, a multi-layer film replaces the existing structure of assembling a diffusion plate with multiple films. The present technical solution saves the diffusion plate, thereby reducing the thickness of the product, and the rigidity can meet the requirements.

[0037] The second structural layer film 2 and the third structural layer film 3 use prisms arranged along the width direction, which can improve the stiffness of the film and reduce the bending moment on the OC.

[0038] By setting a composite adhesive layer 5 between each structural layer film, providing a back coating layer 6 on the back of the fourth structural layer film 4, and adding PBMA or PMMA microbeads to the composite adhesive layer 5 and the back coating layer 6, the PBMA or PMMA microbeads are used to improve the diffusion effect and the haze.

[0039] This laminating film eliminates the need for a diffusion plate and is directly laminated to the OC (opencell, liquid crystal panel), which can reduce raw material costs and process costs, and reduce the thickness of the final module.

[0040] The embodiments described above are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A diffusion-free plate-type laminating film for a liquid crystal display, characterized in that: It includes a first structural layer film, a second structural layer film, a third structural layer film and a fourth structural layer film which are arranged in sequence from top to bottom; The first structural layer film comprises a first structural layer film portion base film and a first structural layer film micro-convex structural layer arranged on the upper surface of the first structural layer film portion base film, wherein the first structural layer film micro-convex structural layer comprises a plurality of PBMA or PMMA micro beads; The second structural layer film comprises a second structural layer film portion base film and a second structural layer film portion prism layer arranged on an upper surface of the second structural layer film portion base film, wherein the second structural layer film portion prism layer is formed by a plurality of second structural layer film portion prisms being continuously arranged; The third structural layer film comprises a third structural layer film portion base film and a third structural layer film portion prism layer arranged on the upper surface of the third structural layer film portion base film, wherein the third structural layer film portion prism layer is formed by a plurality of third structural layer film portion prisms arranged continuously; The fourth structural layer film comprises a fourth structural layer film base film and a fourth structural layer film base film prism layer arranged on the upper surface of the fourth structural layer film base film, and the fourth structural layer film portion prism layer is formed by a plurality of fourth structural layer film portion prisms arranged continuously; A composite adhesive layer is provided at the bottom of the first structural layer film, the second structural layer film and the third structural layer film, a back coating layer is provided at the bottom of the fourth structural layer film, PBMA or PMMA microbeads are provided in the back coating layer and the composite adhesive layer, the composite adhesive layer bonds adjacent structural layer films, and the back coating layer at the bottom of the fourth structural layer film is connected to the panel glass.

2. The diffusion-free plate-type laminating film for liquid crystal display according to claim 1, characterized in that: The cross section of the fourth structural layer film portion prism along the length direction of the fourth structural layer film base film is an isosceles right triangle, and the axial direction of the fourth structural layer film portion prism and the width direction of the fourth structural layer film base film are provided with an angle, and the angle of the angle is , The spacing between adjacent prisms of the fourth structural layer membrane is 200-220um, the bottom width of the prism of the fourth structural layer membrane is 80um, the height is 40um, and the vertex angle is between 88°-90°.

3. The diffusion-free plate-type laminating film for liquid crystal display according to claim 2, characterized in that: 。 4. The diffusion-free plate-type laminating film for liquid crystal display according to claim 1, characterized in that: The axial section of the film prism of the third structural layer is an isosceles right triangle, the lower base width of the isosceles right triangle is between 60-70um, the height is between 30-35 microns, and the vertex angle is between 96-98°.

5. The diffusion-free plate-type laminating film for liquid crystal display according to claim 1, characterized in that: The axial section of the film portion prism of the second structural layer is an isosceles right triangle, the lower base width of the isosceles right triangle is between 60-70 microns, the height is between 30-35 microns, and the vertex angle is between 96-98°.

6. The diffusion-free plate-type laminating film for liquid crystal display according to claim 1, characterized in that: The surface of the film portion prism of the fourth structural layer is provided with an atomization structure, and the atomization structure comprises a plurality of semi-convex spheres randomly distributed on the sides of the film portion prism of the fourth structural layer.

7. A diffusion-free plate-type laminating film for a liquid crystal display according to any one of claims 1 to 6, characterized in that: The particle size of PMMA or PBMA microbeads is between 2 and 5 microns.

8. The diffusion-free plate-type laminating film for liquid crystal display according to claim 2 or 3, characterized in that: The angle between the prism of the fourth structural layer and the prism of the third structural layer is ; The angle between the prism of the fourth structural layer and the prism of the second structural layer is .

9. The diffusion-free plate-type laminating film for liquid crystal display according to claim 1, characterized in that: The height of the micro-convex structure layer of the first structure layer film is between 5-10 um.

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