Liquid crystal light valve with dual function as both optical-to

Details Liquid crystal light valve with dual function as both optical-to Liquid crystal light valve with dual function as both optical-to

1992-12-09

1995-11-14

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358484, 348294, 348359, 359 42, 359 72, H04N 1028, G02F 11335, G02F 1135

Patent

active

054672040

ABSTRACT:
A liquid crystal light valve and a various information processors is provided. The processors have the liquid crystal light valve in which information formed in a liquid crystal layer and corresponding to address light can be read as an optical signal and can be directly read as an electric signal.
A liquid crystal light valve has a glass substrate, an antireflection film, a transparent electrode, an opposite electrode, an optical waveguide, a photoconductive layer, a light interrupting layer, an orientational film, a spacer and a liquid crystal layer. The optical waveguide is composed of a lower clad layer, a core layer and a clad layer. A light source and a photodetector are connected to both ends of the optical waveguide. For example, the light source is constructed by a laser, a light emitting diode (LED), etc. The light source is connected to the optical waveguide such that a polarized wave can be guided to the optical waveguide. For example, the photodetector is constructed by an a-Si:H diode, an a-SiGe:H diode, etc. in accordance with a wavelength of the light source. The photodetector is connected to the optical waveguide so as to receive light therefrom.

REFERENCES:
patent: 3838908 (1974-10-01), Channin
patent: 3980395 (1976-09-01), Giallorenzi et al.
patent: 4094606 (1978-06-01), Camphausen
patent: 5307186 (1994-04-01), Izumi et al.
Rodney D. Sterling et al., "Video-Rate Liquid-Crystal Light-Valve Using An Amorphous Silicon Photoconductor", SID 90 Digest (1990), pp. 327-329.
Masanori Ozaki et al., "Fast Optical Switching In Polymer Waveguide Using Ferroelectric Liquid Crystal", Japanese Journal of Applied Physics 29, [5] May 1990, pp. L843-L845.

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