Composite brightness enhancement film and production apparatus

Abstract

The utility model provides a kind of composite light-increasing film and production equipment, wherein, composite light-increasing film includes upper prism film and lower prism film which are sequentially stacked, upper prism film and lower prism film all include substrate layer, and prism layer with specific texture is arranged in one side of substrate layer, substrate layer has opposite reverse light-incident surface and back-coating surface, prism layer is located in one side of light-incident surface setting, back-coating surface of upper prism film is equipped with back-coating layer, the surface of back-coating layer is convex granular, convex granular diameter is 17-34um, lower prism film is close to the side setting of back-coating layer, upper prism film and lower prism film are perpendicular to each other along the texture direction of prism layer setting.The composite light-increasing film in the utility model, by the convex granular diameter of the back-coating layer of upper light-increasing mechanism is designed to be 17-34um range size, can make that display screen display is more delicate, no particle feeling, so that display effect is better.

Description

Technical Field

[0001] This utility model relates to the field of display screen technology, and in particular to a composite brightness enhancement film and its production equipment. Background Technology

[0002] With the popularization of TFT-LCD liquid crystal display technology, the demand for its backlight film and related optical films is also increasing. Similarly, customers have increasingly strict requirements for the fineness of the picture. Currently, the picture on the film has obvious graininess when viewed from a wide angle. This is due to the image refracted by the backlight enhancement coating structure. The larger the particle size and the higher the roughness of the backlight enhancement coating, the more obvious the graininess will be, thus affecting the display effect. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a composite brightness enhancement film, which aims to solve the technical problem that the brightness enhancement film in the prior art does not have enough fine display due to the large particle size of the back coating.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A composite brightness enhancement film includes an upper prism film and a lower prism film stacked sequentially. Both the upper and lower prism films include a substrate layer and a prism layer disposed on one side of the substrate layer. The substrate layer has a light-incoming surface and a back-coated surface facing away from each other. The prism layer is disposed on one side of the light-incoming surface. The back-coated surface of the upper prism film is provided with a back coating layer. The surface of the back coating layer is granular, and the diameter of the granules is 17-34 μm. The lower prism film is disposed close to the back coating layer. The upper and lower prism films are perpendicular to each other along the texture direction of the prism layers.

[0006] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting the back coating of the back coating surface of the upper prism film into convex particles with a diameter of 17-34um, the surface roughness of the back coating is reduced, the slow reflection propagation of light is reduced, thereby ensuring the brightness effect and making the image display more delicate.

[0007] According to one aspect of the above technical solution, the prism layer includes a first prism and a second prism connected alternately in sequence, wherein the height of the first prism is greater than the height of the second prism.

[0008] According to one aspect of the above technical solution, the cross-sections of both the first prism and the second prism are triangular.

[0009] According to one aspect of the above technical solution, the prism angle between the first prism and the second prism is 90°.

[0010] This utility model also provides a production equipment for composite brightness enhancement film, used to produce the above-mentioned composite brightness enhancement film, including a conveying mechanism. The conveying mechanism includes a dispensing mechanism, a prism layer pressing mechanism, a back coating engraving mechanism, a protective film attaching mechanism, and a finished product storage mechanism arranged in sequence from front to back. The dispensing mechanism is used to dispense the substrate layer. The back coating engraving mechanism includes a metal roller with a micro-concave structure engraved on its surface. The diameter of the micro-concave structure is 17-34 μm. An ultraviolet light source is provided on one side of the metal roller. An ultraviolet curing adhesive storage device is provided at the front end of the metal roller in the direction of rotation.

[0011] According to one aspect of the above technical solution, the prism layer pressing mechanism includes a roller pressing mold, the front end of the roller pressing mold is provided with the ultraviolet curing adhesive storage device, and the ultraviolet light source is provided on the side near the roller pressing mold.

[0012] According to one aspect of the above technical solution, the light-receiving surface of the substrate layer is disposed near the side of the roll forming die, and the back coating surface of the substrate layer is disposed near the side of the metal roller. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the composite brightness enhancement film in one embodiment of the present invention;

[0014] Figure 2 This is a three-dimensional structural diagram of the composite brightness enhancement film in one embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of the granular back coating of an atomic force microscope in one embodiment of the present invention.

[0016] Figure 4 This is a functional diagram of the equipment for producing composite brightness enhancement film in one embodiment of the present invention;

[0017] Explanation of main component symbols: 1-Upper prism film, 11-Substrate layer, 12-Prism layer, 121-First prism, 122-Second prism, 13-Back coating, 131-Particle shape, 2-Lower prism film, 3-Conveying mechanism, 4-Dispensing mechanism, 5-Prism layer pressing mechanism, 51-Roller die, 52-UV curing adhesive storage device, 53-UV light source, 6-Back coating engraving mechanism, 61-Metal roller, 7-Protective film attaching mechanism, 71-Upper protective film attaching assembly, 72-Lower protective film attaching assembly, 8-Finished product storage mechanism;

[0018] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0020] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] See Figures 1 to 3 The composite brightness enhancement film provided in one embodiment of this utility model is mainly used in the field of display screens. It improves the light distribution angle and enhances the brightness of the display screen by total internal reflection or refraction of light.

[0023] The system includes an upper prism film 1 and a lower prism film 2 installed between a lower polarizer and a diffuser. Both the upper prism film 1 and the lower prism film 2 include a substrate layer 11, which is mainly composed of PET (polyethylene terephthalate) material, and a prism layer 12 with a specific directional texture disposed on one side of the substrate layer 11. The substrate layer 11 includes a light-incoming surface on one side and a back-coated surface opposite it. The prism layer 12 is disposed on the light-incoming surface side. A back coating layer 13 is disposed on the back coating surface of the substrate layer 11 of the upper prism film 1. The back coating 13 is formed by pressing with a metal roller 61 on a production equipment. The metal roller 61 is engraved with micro-concave threads. After the back coating 13 is pressed by the metal roller 61, granules 131 are formed on its surface. Light passes through the back coating 13 with granules 131 and is reflected or refracted, thereby changing the light distribution angle. In this embodiment, the diameter of the granules 131 is 17-34 μm. Multiple small-diameter granules 131 form a micro-convex rough surface on the surface of the back coating 13, making the display screen look more delicate and without graininess when viewed from the front.

[0024] See Figure 2Furthermore, the upper prism film 1 and the lower prism film 2 are stacked, that is, the back coating 13 of the upper prism film 1 is bonded to the prism layer 12 of the lower prism film 2. It is worth noting that the texture direction of the prism layer 12 of the upper prism film 1 is perpendicular to the texture direction of the prism layer 12 of the lower prism film 2.

[0025] See Figure 1 The prism layer 12 includes a first prism 121 and a second prism 122, wherein the first prism 121 is vertically higher than the second prism 122. The two first prisms 121 and the second prism 122 are alternately connected and arranged in sequence. Through this regular height change, the prism layer 12 has better anti-adsorption function, as well as a certain shielding function and anti-interference function.

[0026] It is understood that the number of first prisms 121 and second prisms 122 is limited to the alternating connection of two first prisms 121 and two second prisms 122 in this embodiment. It can also be a sequential arrangement of one first prism 121 and multiple second prisms 122, or a sequential arrangement of multiple first prisms 121 and one second prism 122. The specific arrangement and distribution design can be set by those skilled in the art according to actual needs.

[0027] See Figure 1 The first prism 121 and the second prism 122 both have isosceles triangular cross-sectional shapes. This isosceles triangular structure allows some backlight light to be reflected back by total internal reflection at the prism edges for reuse, while some light is refracted through the triangular sides of the prism or enters the next prism for further reflection or refraction. By designing the first prism 121 and the second prism 122 with isosceles triangular cross-sections, the reflection or refraction effect of light is improved, thereby improving the distribution of light in the brightness enhancement film, increasing light utilization, and enhancing screen brightness.

[0028] Furthermore, the prism angle of the first prism 121 and the second prism 122 is 90°. The 90° prism angle setting makes the prism layer 12 reflect and refract light better, improves the light utilization rate, and reduces light loss.

[0029] See Figure 4This embodiment also provides a production equipment for manufacturing the above-mentioned composite brightness enhancement film. The equipment includes a conveying mechanism 3. On one side of the conveying mechanism 3, there are a dispensing mechanism 4 for dispensing the substrate layer 11, a prism layer pressing mechanism 5, a back coating engraving mechanism 6, a protective film attaching mechanism 7, and a finished product storage mechanism 8. It should be noted that the back coating engraving mechanism 6 includes a metal roller 61 and an ultraviolet curing adhesive storage device 52 disposed on one side of the front end of the metal roller 61, and an ultraviolet light source 53 disposed on one side of the metal roller 61. It is also worth noting that the metal roller 61 is electroplated with a nickel-phosphorus layer on its surface by electroplating, and then polished and engraved with a diamond knife to form a micro-concave thread on its surface for imprinting the above-mentioned granular 131 back coating layer 13.

[0030] Furthermore, the prism lamination mechanism 5 includes a roller pressing mold 51. The front end of the roller pressing mold 51 is provided with the ultraviolet curable adhesive storage device 52, and the ultraviolet light source 53 is located near the roller pressing mold 51. It is understood that the surface of the roller pressing mold 51 is provided with a threaded structure for imprinting the prism structure, and the threaded structure can be selected and configured according to the required arrangement of the first prism 121 and the second prism 122. It is worth noting that during the imprinting process, the light-incoming surface of the substrate layer 11 must face the roller pressing mold so that the prism layer 12 is imprinted on the light-incoming surface side. Similarly, the back-coated surface of the substrate layer 11 is located near the metal roller 61.

[0031] Production process:

[0032] First, the PET substrate layer 11 is placed on the dispensing mechanism 4. Driven by the conveying mechanism 3, one end of the substrate layer 11 passes through the prism lamination mechanism 5. Simultaneously, the UV-curable adhesive storage device 52 applies UV curing agent to the light-receiving surface of the substrate layer 11. The UV-curable adhesive is then extruded through the roller die 51. Since the substrate layer 11 is transparent, the UV light source 53 on one side of the roller die 51 irradiates and cures the UV-curable adhesive, setting it to its final shape, thus forming the prism layer 12. Next, the substrate layer 11, driven by the conveying mechanism 3, passes through the back coating engraving mechanism 6. The UV-curable adhesive storage device 52 on one side of the metal roller 61 applies UV curable adhesive to the back coating surface of the substrate layer 11. The film is then extruded and cured by the metal roller 61 and the UV light source 53, finally forming the back coating layer 13 on the back coating surface, thus forming the upper prism film 1. It is worth noting that the metal roller 61 undergoes ultra-precision machining, such as drilling... Processing methods such as stone turning, laser engraving, and electroforming are used to form micro-concave structures with a diameter of 17-34 μm on the surface of the metal roller 61. Under the combined action of the metal roller 61 and the UV curing adhesive storage device 52, the UV curing adhesive forms micro-protruding back coating 13 with a diameter of 17-34 μm on the back coating surface. Then, the protective film attaching mechanism 7 attaches films to both sides of the upper prism film 1 to protect the prism layer 12 and the back coating 13. The protective film attaching mechanism 7 includes an upper protective film attaching component 71 near the prism layer 12 and a lower protective film attaching component 72 near the back coating 13. Finally, the upper prism film 1 is processed and collected by the finished product storage mechanism 8. Similarly, the production of the lower prism film 2 only requires the omission of the imprinting of the back coating 13. Finally, the production of the composite brightness enhancement film is completed by simply stacking the produced upper prism film 1 and lower prism film 2 perpendicularly to each other along the direction of the prism layer 12.

[0033] In summary, the composite brightening film in the above embodiments of this utility model, by engraving the surface of the metal roller with micro-concave threads, forms a 17-34µm diameter granular surface on one side of the back coating during the imprinting process, reducing the roughness of the back coating surface, thereby making the display screen display effect more delicate and better from the front view.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A composite brightness enhancement film, comprising an upper prism film and a lower prism film stacked sequentially, characterized in that, Both the upper prism film and the lower prism film include a substrate layer and a prism layer disposed on one side of the substrate layer. The substrate layer has a light-incoming surface and a back-coated surface disposed opposite to each other. The prism layer is disposed on one side of the light-incoming surface. The back-coated surface of the upper prism film is provided with a back coating layer. The surface of the back coating layer is granular, and the diameter of the granules is 17-34 μm. The lower prism film is disposed close to the back coating layer. The upper prism film and the lower prism film are disposed perpendicular to each other along the texture direction of the prism layer.

2. The composite brightness enhancement film according to claim 1, characterized in that, The prism layer includes a first prism and a second prism connected alternately in sequence, wherein the height of the first prism is greater than the height of the second prism.

3. The composite brightness enhancement film according to claim 2, characterized in that, Both the first prism and the second prism have triangular cross-sections.

4. The composite brightness enhancement film according to claim 2, characterized in that, The prism angle between the first prism and the second prism is 90°.

5. A production equipment for composite brightness enhancement film, characterized in that, The production of the composite brightness enhancement film according to any one of claims 1 to 4 includes a conveying mechanism, the conveying mechanism comprising a dispensing mechanism, a prism layer pressing mechanism, a back coating engraving mechanism, a protective film attaching mechanism, and a finished product storage mechanism arranged sequentially from front to back, the dispensing mechanism being used to dispense the substrate layer, the back coating engraving mechanism including a metal roller with a micro-concave structure engraved on its surface, the diameter of the micro-concave structure being 17-34 μm, an ultraviolet light source being provided on one side of the metal roller, and an ultraviolet curing adhesive storage device being provided at the front end of the metal roller in the direction of rotation.

6. The production equipment for the composite brightness enhancement film according to claim 5, characterized in that, The prism layer pressing mechanism includes a roller pressing mold, the front end of which is provided with the ultraviolet curing adhesive storage device, and the ultraviolet light source is provided on the side near the roller pressing mold.

7. The production equipment for the composite brightness enhancement film according to claim 6, characterized in that, The light-receiving surface of the substrate layer is located near the side of the roll forming die, and the back coating surface of the substrate layer is located near the side of the metal roller.

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