A kind of light diffusion plate and its production method

Abstract

The invention relates to a light diffusion plate and a manufacture method of the light diffusion plate. The method comprises a first step of jet printing or coating of a light diffusion printing ink layer with the thickness of 1-20 microns on a flat-plate-shaped side face of a transparent organic plate and drying the printing ink to obtain a light diffusion layer, a second step of installing the light diffusion plate and a light source together, wherein the light diffusion plate is provided with the light diffusion layer and the transparent organic plate, and the light source is provided with a plurality of luminous points, measuring distribution of radiance of a light emitting surface of the light diffusion plate through a two-dimensional color analysis meter and drawing contour lines of the radiance, a third step of analyzing a thickness distribution diagram needing to be coated with the light diffusion printing ink in a jet printing mode, wherein the thickness distribution diagram corresponds to the radiance contour lines, and a fourth step of jet printing of light diffusion printing ink corresponding to the thickness distribution diagram of the light diffusion printing ink on the light diffusion layer or the other flat-plate-shaped side face of the transparent organic plate through a three-dimensional printer, and drying the light diffusion printing ink to form a second light diffusion layer with a plurality of local thickenings.

Description

[0001] 【Technical field】 [0002] The invention relates to a light diffusion plate, in particular to an optically modulating light diffusion plate and a manufacturing method thereof. [0003] 【Background technique】 [0004] The light diffusion plate is also called uniform light plate and light expansion plate. It has the characteristics of high light diffusion, high light transmittance and good ability to block light sources. It is an important component in the field of LED lighting and flat panel display. The light diffusing plate can play a role of shading and can block the passage of light. Generally, the better the light diffusing property of the light diffusing plate, the lower the light transmittance. At present, the light diffusion plates in the field of LED lighting and flat panel display are mainly divided into two types: direct type and side type according to the light input method. Compared with the side type, the direct type has a more obvious price because the ligh...

AI Technical Summary

Problems solved by technology

At present, the light diffusion plates in the field of LED lighting and flat panel display are mainly divided into two types: direct type and side type according to the light input method. Compared with the side type, the direct type has a more obvious price because the light guide plate is omitted in the middle. Advantages, but it also determines that in order to obtain the same optical effect as the side-entry type, it is necessary to increase the distance between the light source and the diffusion plate or increase the light diffusion of the light diffusion plate to achieve a good uniform light effect, so that not only LED The volume of lighting fixtures or displays is bulky, and the practicability is limited. At the same time, the intensity of light will also be weakened, and the light transmittance will decrease.

[0005] The light diffusion plate currently used is mainly formed by adding a light diffusion agent (with light diffusion particles) to PC / PMMA / PS and other substrates, and then directly forming a unit plate with a preset thickness through hot extrusion, and then through post-frosting. , co-extrusion and other methods, and some manufacturers also use PS diffuser boards to print light guide points on the basis of PS diffuser boards for light guide and uniform light treatment when producing direct-down LED-TV diffuser boards. No matter which production method is used, the The effect of light uniformity is limited, and neither can play a very good effect. There will be light spots on the other side of the diffuser plate located on the LED lamp beads. The more obvious the light spots, the worse the light diffusion effect of the light diffusion plate and the less the light spots. Obviously, it is necessary to increase the thickness of the light diffusion plate and reduce the light transmittance

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