Light diffusion plate and light guide plate having micro structure

Abstract

The invention provides a light diffusion plate and a light guide plate having micro structure. The light diffusion plate and the light guide plate include substrates and a plurality of micro structures disposed on the substrate. Each of the micro structures includes a first projection and a second projection connecting with the first projection in a direction departing from the substrates. The substrate and the first projection are all formed by heat plasticity resin material. The first projection is provided with a projection interface projection from the substrate and connecting with the second projection. The second projection is made of photosensitive resin material and is provided with an outer surface separated with the projection interface of the first projection. Through controlling that the minimum vertical distance between the outer surface of the second projection and the projection interface of the first projection is less than 5 micro meters and the firt projection and the second projection adopt resin raw material having different liquidity, not only the high transferring rate can be realized, but also the costs of manufacturing the light diffusion plate and the light guide plate are reduced.

Description

technical field [0001] The present invention relates to a light diffusion plate and a light guide plate, in particular to a structured light diffusion plate and a light guide plate with microstructures on the surface and the thickness of the plate itself is much greater than the thickness of the microstructure on it, and a light diffusion plate and light guide plate capable of achieving a high transfer rate light guide plate. Background technique [0002] refer to figure 1 , showing an optical plate structure of a conventional backlight module, which uses a co-extrusion process to stack a double-layer microstructure optical plate, mainly including a substrate 7 and a plurality of microstructures 8 formed on the substrate 7 . Each microstructure 8 includes a first protrusion 81 and a second protrusion 91 above the first protrusion 81 . The first convex portion 81 and the second convex portion 91 are respectively composed of a first thermoplastic resin and a second thermopl...

AI Technical Summary

Problems solved by technology

However, since the substrate 7 still has a considerable thickness relative to the second convex portion 91, and the second thermoplastic resin is in a high-viscosity state during co-extrusion, the above optical None of the structural features of the board can obtain a better microstructure transfer rate, that is to say, it is difficult for the second thermoplastic resin to fully squeeze into the depth of the mold cavity to accurately form the second convex part, so the top of the second convex part The molding is often incomplete, and the optical properties that the original optical plate wants to have cannot be achieved.

Taking the light diffusion plate as an example, if the predetermined microstructure shape cannot be formed, the effect of light diffusion and atomization will be reduced; in addition, if it is used as an optical plate for light guide, its luminance effect will be weakened

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