The Analysis of Using Color Separation Grating to Enhance the Optical Efficiency in LCD system
Date Issued
2006
Date
2006
Author(s)
Chen, Chien-Hung
DOI
en-US
Abstract
In LCD (liquid crystal display) system, the color filters decrease the optical efficiency to 33% in LCD. In order to increase the efficiency, the CSG (color separation grating) which is realized by Damman grating is used. First, changing the parameters of the CSG will influence the diffraction efficiency of the CSG. The scalar theory is the suitable theory to simulate the CSG. The Fresnel approximation is used to simulate the light passing through the CSG, but the optical fields of the light have cross-talk and low throughout efficiency. However, to solve the problem, the microlens is used to focus the light to improve the performance. Under some condition, the Frensel approximation will be reduced to the Fraunhofer approximation, and the theoretical optical efficiency for three discrete wavelengths can 2 to 2.5 times of that using color filters.
Next, from the simulation of the multi-wavelength, the different incident light source will affect the design of the CSG importantly. Finally, the color gamut is not very large when the CSG is used in the LCD. However, the new design of the CSG or the color filter will solve the problem. The LCD with color filter and CSG will enhance the color gamut obviously, but not decrease the optical efficiency of the LCD.
Subjects
分色光柵
color separation grating
Type
thesis
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