Diffusion film for preventing light source diffusion at edge of display screen and preparation method thereof

Abstract

The invention discloses a diffusion film for preventing light source diffusion at the edge of a display screen. The diffusion film comprises a fixed jacket, protective frames and a film piece. An anti-scattering frame is additionally arranged at the tail end of a PET substrate, wherein the anti-scattering frame is a component formed by pressing laminated polymethyl methacrylate and polycarbonate through a laminator, and is made of a high-reflectivity high polymer material; after a light source emitted from the edge of an LCD screen makes contact with the anti-scattering frame, the light sourceis reflected back to a diffusion layer of the film piece; the light is reflected by refraction particles and diffusion particles, and then, is emitted from the front surface of the film piece; the protective frames are additionally arranged at four corners of the film piece, the film piece is clamped and embedded in clamping and embedding grooves in the protective frames and is fixed by counter bore bolts, and the film piece is prevented from being damaged due to external force collision; and the fixed jacket is arranged at the top of the film piece and is convenient to mount and dismount. The diffusion film reduces scattering of the light source from the side surface of the diffusion film, so that the diffusion effect of the front surface of the diffusion film is effectively improved, and the diffusion performance of the diffusion film is improved.

Description

technical field [0001] The invention relates to the technical field of diffusion films, in particular to a diffusion film for preventing the diffusion of light sources at the edge of a display screen and a preparation method thereof. Background technique [0002] The diffusion film mainly refers to the backlight light source part of the LCD module. When the light passes through the diffusion layer with PET as the base material, it will pass through the medium with different refractive indices, causing many refractions, reflections and scattering of the light. The phenomenon can correct the light into a uniform surface light source to achieve the effect of optical diffusion. In the backlight structure, it mainly plays the role of correcting the diffusion angle, which will increase the light radiation area, but reduce the light intensity per unit area, that is, reduce Brightness, after the luminous light source is diffused by the diffusion material, it can become a secondary l...

AI Technical Summary

Problems solved by technology

[0002] The diffusion film mainly refers to the backlight light source part of the LCD module. When the light passes through the diffusion layer with PET as the base material, it will pass through the medium with different refractive indices, causing many refractions, reflections and scattering of the light. The phenomenon can correct the light into a uniform surface light source to achieve the effect of optical diffusion. In the backlight structure, it mainly plays the role of correcting the diffusion angle, which will increase the light radiation area, but reduce the light intensity per unit area, that is, reduce Brightness, after the luminous light source is diffused by the diffusion material, it can become a secondary light source with a larger area, better uniformity, and stable chromaticity. It has the effect of diffusing light, that is, the light will be scattered on its surface, making the light soft and uniform The basic structure of most diffusion films is to coat optical astigmatism particles on both sides of a transparent substrate such as PET. The diffusion film has excellent tensile strength, elongation, impact strength, tear strength and expansion strength, and its temperature resistance It is strong, and has the characteristics of high melting point, large thermal expansion coefficient and thermal conductivity coefficient, large thermal deformation tension and wide operating temperature range. Its surface has a strong insulating effect and is widely used in LCD displays of various equipment. The existing technology The diffusion film used for LCD display screen has excellent diffusion effect on the front, but the diffusion effect at the edge of the LCD screen is poor, causing the light source to scatter from the side of the diffusion film, which reduces the diffusion performance of the diffusion film

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