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Proceedings Paper

Talbot grating for color separation in color liquid crystal display
Author(s): Yan Zhang; Qiaofeng Tan; Yingbai Yan; Guofan Jin
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Paper Abstract

The backlight unit should be used to illuminate the liquid crystal display (LCD) panel, and the typical light throughput is around 5% for the color LCDs. This insufficient light efficiency is predominantly related to the use of the color filter. In this paper, a three-step Talbot grating based on the fractional Talbot effect to realize the color separation in the color LCD is proposed in order to increase the light efficiency. Simulation shows that, when the incident light is a uniform plane wave, the light efficiency of 85% is obtained, which is far higher than that of using color filter's 33% theoretically. This design is insensitive to the displacement along the direction of the movement of color separation plane and the change of RGB wavelengths, and it is also insensitive to the grating's steps height. In addition, the Talbot grating is feasible for fabrication.

Paper Details

Date Published: 4 January 2008
PDF: 8 pages
Proc. SPIE 6832, Holography and Diffractive Optics III, 68320P (4 January 2008); doi: 10.1117/12.756747
Show Author Affiliations
Yan Zhang, Tsinghua Univ. (China)
Qiaofeng Tan, Tsinghua Univ. (China)
Yingbai Yan, Tsinghua Univ. (China)
Guofan Jin, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 6832:
Holography and Diffractive Optics III
Yunlong Sheng; Dahsiung Hsu; Chongxiu Yu, Editor(s)

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