Optical diffusion thin film and LCD device using the same

A liquid crystal display device and optical diffusion technology, applied in the field of optical diffusion film and liquid crystal display device, can solve the problems of limited light-gathering ability of the film, loss of the light-gathering ability of the film, low brightness of the display device, etc., and achieve good optical diffusion effect, less The effect of combining component count, high optical uniformity and brightness

Inactive Publication Date: 2009-01-28
上海赞高光学材料有限公司
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AI Technical Summary

Problems solved by technology

[0005] In this design, however, the light-gathering ability of the film is limited because only a few larger particles protrude from the coating.
Moreover, the shape and size distribution of the particles is very wide. Although the optical diffusion ability of the film can be increased, the light-gathering ability of the film is lost at the same time, so that the brightness of the liquid crystal display device directly using this film is not high.
[0006] Therefore, how to solve the problem of limited light-gathering ability of the film caused by the traditional coating method due to only a few large particles protruding from the coating on the surface is one of the technical issues that people in the industry have been working on for a long time.

Method used

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  • Optical diffusion thin film and LCD device using the same
  • Optical diffusion thin film and LCD device using the same
  • Optical diffusion thin film and LCD device using the same

Examples

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Effect test

Embodiment 1

[0029] Example one, as Figure 2A , Figure 2B As shown, the optical diffusion film 100 mainly includes a transparent body 110, the material of which is a transparent polycarbonate (PC) material with a refractive index of 1.586, the protrusions on its upper surface are hemispherical protrusions 120 with a diameter of 80 microns, and the protrusions are arranged in the order of Arranged in a hexagonal shape, two adjacent hemispherical patterns 120 are closely attached to each other to achieve a maximum duty cycle. The array formed by the hemispherical protrusions 120 forms an optical micro-lens group, so that the light 140 incident from the lower surface of the film can be continuously reflected and refracted by it after entering the optical diffusion film 100 to achieve the effect of optical diffusion, and at the same time, it can make the light 140 Concentrate in the direction of propagation to the center to form a condensing effect. The protrusions on the lower surface of ...

Embodiment 2

[0031] In the second embodiment, as shown in FIG. 3 , the optical diffusion film 200 also includes a transparent body 210 , the material of which is a transparent polycarbonate (PC) material with a refractive index of 1.586. The protrusions on the upper surface of the film are hemispherical protrusions 220 with diameters ranging from 15 to 80 microns, the protrusion heights ranging from 0.15 to 0.5 times the diameter, and the protrusions are arranged in a completely random arrangement. The hemispherical protrusions 220 enable the optical diffusion film 200 to have a high optical diffusion effect and a certain light-gathering ability. By adjusting the combination and density of the protrusions 220 on the upper surface of the film, the optical diffusion film 200 can control the diffusion and light-gathering capabilities of the film, and change the central viewing angle brightness and viewing angle range of the output light. Meanwhile, the protrusions on the lower surface of the ...

Embodiment 3

[0035] Example three, as Image 6 Shown is an example of application to a liquid crystal television display using two layers of the above-mentioned optical diffusion film. Among them, 610 is a lamp tube group, 620 is a high-efficiency reflective sheet, 670 is a diffusion plate in a liquid crystal TV, 640 is an optical diffusion film, and 650 is a liquid crystal display panel. In a specific implementation, a single or multiple optical diffusion films 640 can be used to meet the requirements of different brightness and viewing angle of the display.

[0036] The invention can adjust the protrusions on the upper surface of the optical diffusion film, so that the protrusions on the upper surface have different shapes at the same time, such as hemispherical protrusions, semiellipsoidal protrusions, pyramid-shaped protrusions, and conical protrusions. The arrangement of protrusions can be rectangular, hexagonal or random to form patterns; the protrusions on the lower surface of the ...

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Abstract

The invention relates to an optical diffusion film and a liquid crystal display device which uses the optical diffusion film, wherein, the optical diffusion film consists of single-layer polymer material and comprises a polymer material body; furthermore, the upper surface and / or lower surface of the polymer material body respectively forms patterns which consists of n bulges higher than the body by 5um to 350um and are randomly arranged or arranged by prearranged rules. Compared with the prior art, the optical diffusion film of the invention has the advantages that by controlling the dimension, shape and arrangement of the bulges on the upper surface of the film, the optical diffusion film of the invention has good optical diffusion effect and higher light gathering power so as to achieve the optical brightening; furthermore, the liquid crystal display device which uses the optical diffusion film of the invention has few number of the combined components and high optical uniformity and brightness, and reduces the cost of the liquid crystal display device.

Description

technical field [0001] The present invention relates to an optical diffusion film and a liquid crystal display device using the optical diffusion film. Background technique [0002] In recent years, the rapid development of flat-panel display technology, especially liquid crystal display technology and the wide application in mobile communication equipment display, notebook computer display, desktop computer display and large-size LCD TV, the performance requirements of optical diffusion films in display devices are increasing day by day. Mainly focus on improving brightness and lighting uniformity. [0003] The existing optical diffusion films used in liquid crystal display devices are mostly multilayer films produced by coating, wherein the coating layers of the multilayer films produced by coating contain scattering particles of different sizes. [0004] figure 1 It is a schematic structural diagram of a traditional optical diffusion film produced by coating. The optica...

Claims

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Application Information

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IPC IPC(8): G02B5/02G02B1/04G02F1/13357G02F1/1335
Inventor 方平应高波
Owner 上海赞高光学材料有限公司
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