Brightness enhancement film and composite film containing brightness enhancement film

Abstract

The utility model provides a brightness enhancement film and a composite film containing the brightness enhancement film, the brightness enhancement film comprises a base material and a prism structure layer arranged on the base material, the prism structure layer comprises a plurality of main prism structures, the main prism structures are adjacently arranged in pairs according to a certain direction to form an array, and the main prism structures are arranged in the array. A sub-prism structure is arranged at the junction of every two adjacent main prism structures, the sub-prism structures and the main prism structures are arranged in the same direction, the height of the main prism structures is H, the height of the sub-prism structures is h, and h is smaller than or equal to H / 3, so that the sub-prism structures do not affect the light condensation effect of the main prism structures, and the light condensation effect of the main prism structures is improved. And escape light at the junction of the main prism structure can be fully converged, so that an extra light condensation effect is realized, and the brightness gain of the brightness enhancement film is increased.

Description

Technical Field

[0001] The utility model relates to the field of optics, and particularly relates to a brightness enhancement film and a composite film containing the brightness enhancement film. Background Art

[0002] A brightness enhancement film (BEF) is an optical thin film mainly used to improve the brightness of liquid crystal display devices. Its structure mainly consists of two layers: a transparent PET substrate layer and a light-emitting surface provided on the transparent PET substrate layer, and the light-emitting surface is a micro-prism structure.

[0003] This structural design enables the brightness enhancement film to effectively recover and gather light, thereby improving the brightness of the display device.

[0004] In the prior art, the light-emitting surface of the existing brightness enhancement film is generally a triangular prism structure, which can achieve an obvious light-gathering effect. Using a single sheet can increase the brightness by about 15%, and using two sheets stacked can increase the brightness by about 30%. However, there is escaping light between adjacent triangular prism structures, which reduces the brightness gain of the brightness enhancement film. Since the light-emitting surface of the existing brightness enhancement film is a neat and aligned triangular prism structure, the light emission is uniform and it is easy to form a moiré effect with the polarizer, pixels, etc. of the liquid crystal panel. The moiré effect will seriously affect the image quality. Therefore, it is necessary to set a diffusion film, a microlens film, etc. on the light-emitting surface of the brightness enhancement film for improvement, but this will additionally increase more costs. Summary of the Utility Model

[0005] Based on this, the purpose of the present utility model is to provide an LED substrate and a reflow oven using the substrate, which can effectively solve the deficiencies in the above-mentioned prior art.

[0006] A brightness enhancement film includes a substrate and a prism structure layer provided on the substrate. The prism structure layer includes a plurality of main prism structures. The main prism structures are arranged adjacent to each other in an array. A sub-prism structure is provided at the junction of two adjacent main prism structures. The sub-prism structure is arranged in the same direction as the main prism structure. The height of the main prism structure is H, and the height of the sub-prism structure is h, where h ≤ H / 3. The sub-prism structure is a triangular prism structure, or a spherical structure, or a layout of a triangular prism structure and a spherical structure. When the sub-prism structure is a triangular prism structure, the apex angle of the sub-prism structure is equal to that of the main prism structure. When the sub-prism structure is a spherical structure, the arc angle of the sub-prism structure is equal to the apex angle of the main prism structure.

[0007] Compared with the prior art, the beneficial effects of the present utility model are as follows: By arranging a sub-prism structure at the junction of two adjacent main prism structures, the height of the main prism structure is H, and the height of the sub-prism structure is h, where h ≤ H / 3. Such an arrangement enables the sub-prism structure not only not to affect the light-gathering effect of the main prism structure, but also to fully converge the escaping light at the junction of the main prism structures, achieving an additional light-gathering effect and increasing the brightness gain of the brightness enhancement film; By arranging a sub-prism structure at the junction of two adjacent main prism structures, the light-emitting intensity and direction of the sub-prism structure are different from those of the main prism structure, thereby disrupting the light-emitting pattern and making it less likely to generate moiré patterns.

[0008] Further, the main prism structure is a triangular prism structure.

[0009] Further, the distance P between the apex angles of two adjacent main prism structures is 50 μm - 80 μm.

[0010] Further, the height H of the main prism structure is 25 μm - 40 μm.

[0011] Further, the apex angle a of the main prism structure is 85° - 95°.

[0012] On the other hand, the present utility model also proposes a composite film, which includes a diffusion film arranged at the top, the above-mentioned brightness enhancement film arranged at the bottom, and a microlens film arranged between the diffusion film and the brightness enhancement film. Another brightness enhancement film is also arranged between the microlens film and the diffusion film.

[0013] Further, an adhesive layer is arranged between the diffusion film, the brightness enhancement film, and the microlens film, and the diffusion film, the brightness enhancement film, and the microlens film are adhered through the adhesive layer. Description of the Drawings

[0014] Figure 1 It is a cross-sectional view of the overall structure of the brightness enhancement film in Embodiment 1 of the present utility model;

[0015] Figure 2 It is an optical path diagram of the brightness enhancement film in the prior art;

[0016] Figure 3 It is an optical path diagram of the brightness enhancement film in Embodiment 1 of the present utility model;

[0017] Figure 4 It is a cross-sectional view of the overall structure of the composite film in Embodiment 2 of the present utility model;

[0018] Main Component Symbol Description:

[0019] Substrate 10 Diffusion film 30 Prism structure layer 20 Microlens film 40 Main prism structure 21 Adhesive layer 50 Sub-prism structure 22

[0020] The following specific embodiments will further illustrate the present utility model in conjunction with the above-mentioned drawings. Detailed implementation manners

[0021] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant attached drawings. Several embodiments of the present utility model are given in the attached drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive.

[0022] It should be noted that when an element is referred to as "fixedly provided on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used herein in the description of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0024] Embodiment 1

[0025] Please refer to Figures 1 to 3 , the brightness enhancement film in Embodiment 1 of the present utility model includes a substrate 10 and a prism structure layer 20 provided on the substrate 10. The prism structure layer 20 includes a plurality of main prism structures 21. The main prism structures 21 are triangular prism structures and are arranged adjacent to each other in pairs in a certain direction in an array. A sub-prism structure 22 is provided at the junction of two adjacent main prism structures 21. The sub-prism structure 22 is arranged in the same direction as the main prism structure 21. The height of the main prism structure 21 is H, and the height of the sub-prism structure 22 is h, where h ≤ H / 3.

[0026] Further, the distance P between the apex angles of two adjacent main prism structures 21 is 50 μm - 80 μm.

[0027] Further, the height H of the main prism structure 21 is 25 μm - 40 μm.

[0028] Further, the apex angle a of the main prism structure 21 is 85° - 95°.

[0029] In this embodiment, the apex angle a of the main prism structure 21 takes a value of 90° to obtain the maximum brightness gain.

[0030] Furthermore, the sub-prism structure 22 is a triangular prism structure, a spherical structure, or an arrangement of a triangular prism structure and a spherical structure. When the sub-prism structure 22 is a triangular prism structure, the apex angle of the sub-prism structure 22 is equal to that of the main prism structure 21. When the sub-prism structure 22 is a spherical structure, the arc angle of the sub-prism structure 22 is equal to the apex angle of the main prism structure 21.

[0031] It should be noted that in this embodiment, the sub-prism structure is an arrangement of a triangular prism structure and a spherical structure.

[0032] It can be understood that by arranging the sub-prism structure 22 at the junction of two adjacent main prism structures 21, the height of the main prism structure 21 is H, and the height of the sub-prism structure 22 is h, where h ≤ H / 3. Such an arrangement makes it so that the sub-prism structure 22 not only does not affect the light-gathering effect of the main prism structure 21, but also can fully converge the escaping light at the junction of two adjacent main prism structures 21, achieving an additional light-gathering effect and increasing the brightness gain of the present utility model. By arranging the sub-prism structure 21 at the junction of two adjacent main prism structures 21, the light-emitting intensity and direction of the sub-prism structure 21 are different from those of the main prism structure 22, and thus the light-emitting pattern can be disrupted, and moiré patterns are not easily generated.

[0033] Embodiment Two

[0034] Please refer to Figure 4 , the composite film in Embodiment Two of the present utility model includes a diffusion film 30 arranged at the top, a light enhancement film in Embodiment One arranged at the bottom, and a microlens film 40 arranged between the diffusion film 30 and the light enhancement film. Another light enhancement film is also arranged between the microlens film 40 and the diffusion film 30. An adhesive layer 50 is arranged between the diffusion film 30, the light enhancement film, and the microlens film 40, and the diffusion film 30, the light enhancement film, and the microlens film 40 are adhered through the adhesive layer 50.

[0035] It can be understood that by adhering the light enhancement film in Embodiment One, a traditional diffusion film, a microlens film, etc. through an adhesive, a composite film with a higher brightness gain and not easily generating moiré patterns can be formed, which can perfectly replace the traditional composite film without increasing costs.

[0036] In summary, the brightness enhancement film and the composite film containing the same in the above embodiments of the present utility model: by arranging a sub-prism structure at the junction of two adjacent main prism structures, the height of the main prism structure is H, and the height of the sub-prism structure is h, where h ≤ H / 3. Such an arrangement enables the sub-prism structure not only not to affect the light-concentrating effect of the main prism structure, but also to fully converge the escaping light at the junction of the main prism structures, achieving an additional light-concentrating effect and increasing the brightness gain of the brightness enhancement film; by arranging a sub-prism structure at the junction of two adjacent main prism structures, the light-emitting intensity and direction of the sub-prism structure are different from those of the main prism structure, thereby disrupting the light-emitting pattern and making it difficult to generate moiré patterns.

[0037] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0038] The above-described embodiments merely represent several implementation manners of the present utility model, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model should be subject to the appended claims.

Claims

1. A brightness enhancement film, characterized in that, It includes a substrate and a prism structure layer disposed on the substrate. The prism structure layer includes a plurality of main prism structures. The main prism structures are arranged adjacent to each other in an array. A sub - prism structure is provided at the junction of two adjacent main prism structures. The sub - prism structure is arranged in the same direction as the main prism structure. The height of the main prism structure is H, and the height of the sub - prism structure is h, where h ≤ H / 3. The sub - prism structure is a triangular prism structure, a spherical structure, or a layout of a triangular prism structure and a spherical structure. When the sub - prism structure is a triangular prism structure, the apex angle of the sub - prism structure is equal to that of the main prism structure. When the sub - prism structure is a spherical structure, the arc angle of the sub - prism structure is equal to the apex angle of the main prism structure.

2. The brightening film according to claim 1, characterized in that, The main prism structure is a triangular prism structure.

3. The brightening film according to claim 1, characterized in that, The distance P between the apex angles of two adjacent main prism structures is 50 μm - 80 μm.

4. The brightness enhancement film according to claim 1, wherein, The height H of the main prism structure is 25 μm - 40 μm.

5. The brightening film according to claim 1, characterized in that, The apex angle a of the main prism structure is 85° - 95°.

6. A composite film, characterized in that, It includes a diffusion film provided at the top, a brightness enhancement film according to any one of claims 1 - 5 provided at the bottom, and a microlens film provided between the diffusion film and the brightness enhancement film. Another brightness enhancement film is also provided between the microlens film and the diffusion film.

7. The composite film according to claim 6, characterized in that, An adhesive layer is provided between the diffusion film, the brightness enhancement film, and the microlens film. The diffusion film, the brightness enhancement film, and the microlens film are adhered through the adhesive layer.

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