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Proceedings Paper

Normally white reflective twisted nematic mode for silicon-chip-based light valves
Author(s): Shoichi Hirota; Makoto Tsumura; Hideki Nakagawa; Toshio Miyazawa; Iwao Takemoto
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Paper Abstract

Crystalline silicon-chip-based reflective light valves are suitable for realizing high definition and bright liquid crystal projectors. We have developed an XGA silicon-chip- based light valve with a diagonal display area of 1 inch. A normally white reflective twisted nematic mode is selected for the valve. An optimum condition of the mode is analytically solved by the Jones matrix method. This mode is suitable for a narrow cell gap and a fast response time can be expected. This mode also has a stable contrast ratio even with temperature and/or cell gap fluctuation. In addition, the driving voltage of this mode is low and it has good chromaticity with small retardation. The cell gap of the light valve is 2 micrometers . The cell gap support is made using spacer posts formed on the silicon chip with a photo- definable resin. The response time is 12 ms including both rise and fall times. The contrast ratio is more than 400 at 5 Vrms.

Paper Details

Date Published: 26 March 1999
PDF: 9 pages
Proc. SPIE 3635, Liquid Crystal Materials, Devices, and Applications VII, (26 March 1999);
Show Author Affiliations
Shoichi Hirota, Hitachi, Ltd. (Japan)
Makoto Tsumura, Hitachi, Ltd. (Japan)
Hideki Nakagawa, Hitachi, Ltd. (Japan)
Toshio Miyazawa, Hitachi, Ltd. (Japan)
Iwao Takemoto, Hitachi, Ltd. (Japan)

Published in SPIE Proceedings Vol. 3635:
Liquid Crystal Materials, Devices, and Applications VII
Ranganathan Shashidhar, Editor(s)

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