Design of Diffractive Color Separation Grating for Optimized Power and Color Performance
Date Issued
2007
Date
2007
Author(s)
Yeh, Chia-Sheng
DOI
zh-TW
Abstract
It is fundamental to use the color filter (CF) in LCD system to achieve a full-color display. For this purpose, however, the total power efficiency will plummet to 33% when the light passes through the CF. In order to alleviate this problem, we have developed a novel approach by inserting a diffractive color separation grating between the backlight and the CF to spatially separate the RGB (red, green, and blue) lights and then the three bands can be directed into three different corresponding sub-pixels. We simulated such multiple-level gratings based on Fraunhofer diffraction theory and analyze the diffraction power efficiency and color performance for the new backlight systems. We take three different light sources (CCFL, UHP, and LED) as our simulation examples and design the corresponding grating structure (the period, step and height of the grating) for each light source. The simulation results we derived for CCFL backlight demonstrate that we can get the best power efficiency improvement by 93.8% as compared with the conventional system. The gamut area can be improved by 20.8% as well. For the other two backlight systems (UHP and LED), we can design the gratings and get the best brightness efficiency improvement by 91% and 107% and gamut area improvement by 10.2 % and 12.7%, respectively. In conclusion, by adopting this novel approach we can successfully achieve the goal of improving total power efficiency and enhance the color performance at the same time.
Subjects
光柵
分光光柵
grating
color separation grating
diffractive color separation grating
Type
thesis
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