Optical diffusion thin film and LCD device using the optical diffusion thin film

Abstract

The invention discloses an optical diffusion film and a liquid crystal display device using the optical diffusion film. The film comprises a transparent base plate, an upper diffusion coating provided with upper diffusion particles is arranged on the upper surface of the transparent base plate; wherein, the upper diffusion particles comprise macro-particles and micro-particles, and the maximum physical dimensions of the macro-particles and the micro-particles are respectively 1 - 100 microns and 0.1 - 50 microns; the physical dimension ratio of the macro-particles and the micro-particles parallel to the surface direction of the transparent base plate is 2:1 - 100:1, and the macro-particles and the micro-particles are arrayed at intervals; the thickness of the upper diffusion coating after film forming is 1 / 2 - 7 / 8 of the maximum physical dimension of the macro-particles. The optical diffusion film has the advantages that, by controlling the dimensions and shapes of the macro-particles and the micro-particles and arraying the macro-particles and the micro-particles at intervals, gaps between the macro-particles are replaced by the micro-particles, thus reducing the loss of light source, strengthening the condensation performance of the film, and achieving a favorable atomization effect. A display device adopting the film provided by the invention has the advantages of smaller quantity of combined components and higher optical uniformity and brightness.

Description

technical field [0001] The invention relates to an optical film, in particular to an optical diffusion film and a liquid crystal display device using the optical diffusion film. Background technique [0002] Existing optical diffusion films are widely used in devices requiring light sources such as liquid crystal display devices, advertising light boxes, lighting fixtures, and keys of mobile communication equipment to provide uniform illumination. In recent years, with the rapid development of liquid crystal display devices and their wide application in mobile communication equipment displays, notebook computer monitors, desktop computer monitors and large-size LCD TVs, the performance requirements for optical diffusion films used in liquid crystal display devices are also increasing. Improvement, mainly focused on improving brightness and lighting uniformity. [0003] The existing optical diffusion films used in liquid crystal display devices are mostly single-layer organi...

AI Technical Summary

Problems solved by technology

However, in this design, since only a few particles with larger sizes protrude from the coating, and because the particle diameters of these larger particles are larger, the gap between the particles is larger, causing part of the light source to pass through the gap. Leaked, resulting in loss of light source, so the light gathering ability of this film is very limited

Moreover, the shape and size distribution of the particles is very wide. Although the optical diffusion ability of the film can be increased, the light-gathering ability of the film is lost at the same time, and the brightness gain is reduced, so that the brightness of the liquid crystal display device directly using this film is not high.

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