Holographic brightening element and half-reverse half-penetrating type LCD (liquid crystal display) containing same

Abstract

The invention relates to a holographic brightening element and a half-reverse half-penetrating type LCD (liquid crystal display). The holographic brightening element comprises a holographical thin-film material layer, wherein the holographical thin-film material layer is a material layer with an optical diffraction property, which is formed in a way that a bundle of planar light and a bundle of scattered reflection light which have coherence enter from the two sides of a photopolymer thin-film material to carry out laser exposure and the light refractive index of the material is adjusted; and the half-reverse half-penetrating type LCD is provided with the holographical brightening element between a polarizing film and a reflection-type polaroid, and a filtering function of an optical holography element is utilized to effectively converge the illumination light entering a half-reverse half-penetrating type LCD display screen to an observation angular field of the display screen by the actions of diffraction and scattered reflection so as to further improve backlight efficiency and illumination light efficiency; and a filtering spectra of the holographical brightening element and a light source spectra of a backlight light guide LED are separated, the back lighting is free from the diffraction influence of the holographical brightening element, and the full transmission is achieved, thereby turning into a full-reverse full-penetrating type LCD.

Description

technical field [0001] The invention relates to a holographic brightening element and a transflective LCD (Transflective LCD) containing the element, belonging to the technical field of LCD display optical materials. Background technique [0002] LCD display can be divided into reflective LCD and transmissive LCD. In the existing technology, the holographic element based on the principle of diffraction prepared by photopolymer material has realized the application in reflective LCD (see patent No. 94190861.5 Chinese patent, CN1116003A), reflective TN LCD (Twisted Nematic), STN LCD (Super Twisted Nematic), TFT LCD (Thin Film Transistor) use the diffraction effect of holographic elements to improve the brightness and visibility of reflective LCD. [0003] Transflective LCD modules include TN LCD, STN LCD, and TFT LCD, which are composed of a liquid crystal panel and a backlight material. The backlight material includes a semi-reflective and semi-transparent film, a reflective...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a holographic brightening element and a transflective LCD containing the element for the problem of unsatisfactory backlight efficiency in transflective TN LCD, STN LCD and TFT LCD. The diffraction characteristics of the brightening element can selectively filter different bands. By changing the viewing angle direction and angle range of diffuse reflection, the interference caused by specular reflection can be effectively avoided, and the brightness under outdoor lighting can be significantly improved. And contrast, if the filter spectrum of the holographic brightening element is separated from the spectrum of the backlight light waveguide LED light source, the backlight can not be affected by the diffraction of the holographic brightening element, and achieve full transmission, and the semi-reflective and semi-transparent LCD can be transformed into a full-reflection and full-transmission type LCD

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