Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-12-27
1992-12-01
Miller, Stanley D.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 63, 359 94, 359100, G02F 113
Patent
active
051683814
ABSTRACT:
Fast switching, high-contrast light valves and light valves which function for multi-level, gray-scale production are provided. Light valves of this invention employ two or more low-tilt, chiral smectic liquid crystal cells which are half-wave plates. Bistable FLC cells or FLC cells having smectic A* materials which display a field dependent tilt angle can be used. The FLC cells of exemplary device configurations are positioned sequentially along a light path through the device with the optic axes of the sequential FLC cells rotating in opposite directions upon application of a driving electric field thereacross. Light valves employing smectic C* and smectic A* liquid crystal cells are provided.
REFERENCES:
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patent: 4563059 (1986-01-01), Clark et al.
patent: 4838663 (1989-06-01), Lagerwall et al.
patent: 4879144 (1989-11-01), Nakura et al.
patent: 5035491 (1991-07-01), Kawagishi et al.
Handschy et al., "Polarization-based optical parallel logic gate using FLCs", Optics lett., vol. 12, No. 8, Aug. 1987, pp. 611-613 (no date).
Mai Huy K.
Miller Stanley D.
University Research Corporation
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