a light diffuser

A light diffusion sheet and diffusion particle technology, applied in optics, optical components, instruments, etc., can solve the problems of complicated process and expensive equipment, and achieve the effect of simple process, cheap equipment, and smooth and simple process

Active Publication Date: 2020-03-20
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of melt extrusion is complex and requires expensive equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment one: see attached figure 1 As shown in , a light diffusion sheet, a structural schematic diagram of a light diffusion sheet with patterned arrangement of light diffusion particles. On the substrate 12, there are recessed structures 14, these recessed structures 14 present a preset topological arrangement, such as square, hexagonal, strip, ring, etc., the width of the recessed structure is greater than 1 micron, and the aspect ratio is greater than 0.3 . The concave structure 14 is filled with diffusion particles 11 of organic or inorganic materials. The diffusion particles 11 can be spherical, ellipsoidal, cylindrical, cuboid, or other special-shaped bodies. Different from the protective layer, the absolute difference between the optical refractive index of the diffusing particles and the refractive index of the transparent substrate layer, microstructure layer, protective layer material, or one of them is not less than 0.01. When the incident light beam pa...

Embodiment 2

[0042] Embodiment two: see attached Figure 2a-2d As shown, the manufacturing process of a light diffusion sheet proposed by the present invention. First, a mold with a topologically arranged patterned raised structure is fabricated. Figure 2a The patterned convex structure mold in the middle can be realized by various methods, such as mask photolithography exposure, laser direct writing, chemical etching or mechanical scribing, etc. The material of the mold can be metal materials, such as nickel, stainless steel, copper or metal alloy materials, organic materials, such as polycarbonate, polyvinyl chloride, polyester, perfluoropolyetherene, tetrafluoroethylene copolymer and acrylic; Inorganic non-metallic materials such as silica, silicon, carbon steel, silicon carbide. Secondly, Figure 2b It is a schematic diagram of using a mold to make a concave structure on a transparent substrate 22 by embossing. Hot embossing or UV embossing can be used. Hot embossing is to first ...

Embodiment 3

[0043] Embodiment three: see attached Figure 3-4 As shown, in the light diffusion sheet proposed by the present invention, the shape of the concave structure filled with diffusion particles depends on the microstructure shape of the mold. Microstructure shapes such as spheres, ellipsoids, triangular pyramids, quadrangular pyramids, etc., and cross-sections of circles, ellipses, triangles, quadrilaterals or other irregular polygons, and shapes that can be filled with diffusion particles are all within the protection scope of the present invention. Diffusion particles are filled in the processed concave structure, and its state is as attached Figure 5-6 shown. When the structure on the mold has a high aspect ratio, the concave structure of the microstructure layer will also have a large aspect ratio, and the diffusion particles will be arranged in a multi-layer stacked manner in the concave structure, such as attached Figure 7 shown. This provides an additional spatial dim...

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Abstract

The invention discloses a light diffuser and a manufacturing method. The light diffuser is structurally characterized by comprising a transparent base material layer; a micro structure layer is arranged on the surface of one side of the transparent base material layer, and the sunken structure of the micro structure layer is filled with diffusion particles. In order to obtain the light diffuser, the manufacturing method of the light diffuser is characterized in that a mold of a topology arrangement pattern protrusion structure copies the mold structure on a transparent substrate in an embossing mode to obtain the sunken structure complementary with the mold structure; on the basis of a blade coating technology, the diffusion particles coat the micro sunken structure to form imaging diffusion particle arrangement. Due to the imaging diffusion particle arrangement, the problem that a traditional random structure cannot perform artificial optimization is solved, and under the joint action of the imaging structure and the diffusion particles, the light diffusion effect is generated for back light source and beam shaping direction.

Description

technical field [0001] The invention relates to a light diffusion sheet, which has the structure of filling light diffusion particles in patterned microstructure grooves. Under the joint action of patterned structure and diffusing particles, light diffusion effect is produced, which is used for backlight and beam shaping direction. Background technique [0002] Light diffusers are essential components in the display and lighting fields. Its main function is to diffuse light and uniformly convert point / line light sources into line / area light sources. Traditional diffusers add chemical particles to transparent plastic materials to form a diffusion layer. In the diffusion layer, the incident light propagates in two or more media with different refractive indices, refraction, reflection and scattering occur, forming the effect of diffused light. [0003] At present, there are three main processing methods for light diffusion sheets: embossing processing, heat treatment injecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/02
CPCG02B5/0226G02B5/0268
Inventor 申溯朱继承吴建宏
Owner SUZHOU UNIV
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