Compound optical film structure

Abstract

The invention relates to a compound optical film structure, comprising a transparent substrate, a diffusion layer, a flattening layer and a light collecting structure. The diffusion layer is arranged on the transparent substrate, wherein the diffusion layer has a first refractive index and a rough upper surface; the flattening layer is arranged on the upper surface of the diffusion layer, wherein the flattening layer has a second refractive index and a rough lower surface; and the light collecting structure is arranged on the flattening layer, wherein the light collecting structure has a third refractive index, the first refractive index is not equal to the second refractive index, and the second refractive index is not equal to the third refractive index. In the embodiment, the compound optical film structure can achieve the diffusion effect by utilizing the rough upper surface of the diffusion layer and controlling the difference of the refractive indexes of the diffusion layer and the flattening layer without providing an upper diffusion sheet. In addition, the effective light collection effect can be provided through arranging the light collecting structure and controlling the relations of the refractive indexes of the flattening layer, the light collecting structure and an external medium.

Description

technical field [0001] The invention relates to a composite optical film structure technology, in particular to a composite optical film structure with high diffusion and light collection effects without a diffusion sheet. Background technique [0002] The liquid crystal display is a non-active light-emitting display technology, so the light provided by the backlight module must be used as a light source to perform the display function. Generally speaking, the backlight module must be provided with a prism sheet to produce a light collection effect to improve light utilization efficiency, and at least one upper diffusion sheet with diffusion particles is provided to further scatter light to avoid generation of rainbow patterns. [0003] Please refer to figure 1 . figure 1 A schematic diagram of a backlight module in the prior art is shown. Such as figure 1 As shown, the backlight module 10 in the prior art includes a plurality of light sources 12, a reflector 14 is arran...

AI Technical Summary

Problems solved by technology

In the above-mentioned prior art, the refractive index of the lens layer 13 needs to be increased in order to improve the overall light concentration, but the refractive index of the diffusion layer 12 needs to be reduced in order to increase the degree of fogging. This will result in the proportion of light passing through the diffusion layer 12 becomes lower and makes light utilization worse

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