Light scattering slice and preparation method thereof

Abstract

The invention discloses a method for manufacturing light diffusion sheets. The invention is characterized in that the method comprises the following steps of (1) manufacturing an imprint die core with at least one microlens structure; (2) designing computer-based imprint control programs, imprint parameters and pattern files; (3) imprinting the die core of the step (1) on a substrate to be imprinted in a first imprint work position according to the control programs and the pattern files of the step (2), by using hot nanoimprint or ultraviolet-imprint lithography, to obtain the relevant number of concave micro-lenses on the substrate; (4) chaining the position of the imprint die core relative to the imprinted substrate according to the imprint parameters until the next imprint work position; (5) repeating the steps (3) and (4) until all the imprint procedures are completed. The invention can directly imprint concave micro-lenses on the substrate by hot nanoimprint or ultraviolet-imprint lithography, allows the light dispersion layer to be integrated with the substrate as a whole, avoids the problems of unstable adhesion, poor diffusion effect due to the difference in thermal expansion coefficient and physical deformation, and efficiently improves the performance of light diffusion sheets.

Description

technical field [0001] The invention relates to a light diffusion sheet and a manufacturing method thereof, which are suitable for a backlight module of a liquid crystal display device and also for a projection screen based on a light diffusion sheet structure. Background technique [0002] Today's liquid crystal display devices mostly use backlight lighting from the back of the liquid crystal panel, and there are backlight devices such as side light and vertical backlight. Taking the backlight module for side-light lighting for notebooks as an example, as shown in Figure 1, it has: a lamp tube 1, which is semiconductor lighting or cold light source lighting, and is in the form of a line as a light source; a reflector 2; a light guide plate 17, It is in the shape of a square plate; the lower light diffusion film 4 has a transparent substrate 14 , the bottom has an anti-adhesive material 13 , and the top has diffusion particles 15 ; the prism grid f...

AI Technical Summary

Problems solved by technology

Due to the uneven coating of the material, the diffusion film cannot fully achieve uniform light diffusion

Another major disadvantage of the coating method is that since different materials (such as synthetic resins) are used for the diffusion film base material, adhesive, and diffusion particles, it is easy to cause deformation or discoloration (yellowing) due to heat or ultraviolet rays.

Insufficient adhesion between the micro-diffusing particles and the adhesive will also lead to poor strength and a decrease in light transmittance

[0009] 3) Although the machining method is more flexible, it requires high-precision machining equipment, resulting in increased production costs and reduced efficiency

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