Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1992-12-31
1994-07-26
Gross, Anita P.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 40, 359 63, G02F 11335
Patent
active
053330722
ABSTRACT:
A reflective liquid crystal display overhead projection system. The projection system includes a reflective polarizer, a phase modulating liquid crystal display on the reflective polarizer, and a fresnel lens on the liquid crystal display. Unpolarized light rays are directed toward the fresnel lens, pass through the liquid crystal display, and are reflected and polarized by the reflective polarizer. The light rays then pass back through the liquid crystal display and the fresnel lens and on toward a projector head, where the light rays are analyzed by a polarizer and projected toward a screen.
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"Phase Transition-Type Liquid Crystal Projection Display," Koike et al., Fujitsu Sci. Tech. J., 23, 3, pp. 146-153 (Sep. 1987).
Schadt et al, "New Liquid Crystal Polarized Color Projection Principle," Japanese Journal of Applied Physics, vol. 29, No. 10, Oct. 1990, pp. 1974-1984.
Weber, M. F., "Retroreflecting Sheet Polarizer," Society for Information Display, 1992, 23.3, pp. 427-429.
Griswold Gary L.
Gross Anita P.
Kirn Walter N.
Levinson Eric D.
Minnesota Mining and Manufacturing Company
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