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Title: High contrast SXGA silicon light valves for high definition video projectors
Authors: Huang, Ho-Chi
Cheng, Po Wing
Kwok, Hoi-Sing
Keywords: Silicon light valve
Video projector
Issue Date: Jul-2000
Citation: Display Technologies III, I-Wei Wu, Heiju Uchiike, Editor, Proceedings of SPIE Vol. 4079, p. 17-26 (2000)
Abstract: We have developed a highly integrated liquid-crystal-on-silicon light valve for three-panel color projector. The silicon panel was designed and fabricated by a 0.35μm, 3-metal and dual-voltage CMOS process with a spatial resolution of 1280 x 1024 pixels. The pixel pitch was 12μm, the fill factor was 90% and the display area was 0.77' in diagonal. Eight-bit digital data drivers and gamma-correction circuitry were integrated into the silicon panel for true gray scale and full color representation. The display panel was assembled with a mixed twisted nematic and birefringence liquid crystal cell for high contract at CMOS compatible voltage. Contrast ratio was typically 200:1 at 5.5Vrms. In addition, silicon surface layers, liquid crystal materials, pixel structures and driving schemes were carefully optimized for the minimization of visual flicker. Flicker ratio of less than 3% was achieved at 60Hz frame rate. The optical sub-system utilized a trichronic prism assembly for both color separation and recombination. With this trichroic prism assembly incorporating three silicon light valves, a compact and high-contrast SXGA video projector was demonstrated.
Rights: Copyright 2000 Society of Photo-Optical Instrumentation Engineers. This paper was published in Display Technologies III, I-Wei Wu, Heiju Uchiike, Editor, Proceedings of SPIE Vol. 4079, p. 17-26 (2000) and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
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