Light addressed liquid crystal light valve incorporating electri

Optical: systems and elements – Holographic system or element – Using a hologram as an optical element

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359 72, G02F 1133

Patent

active

050847775

ABSTRACT:
An improved light addressed liquid crystal light valve incorporating electrically insulating light blocking material is disclosed. The light valve has a hydrogenated amorphous silicon photosensitive layer and a germanium containing or tin containing alloy film as a light blocking layer. The light blocking layer that may be used is a selected alloy which includes one or more elements from the group consisting of germanium and tin, one or more elements from the group consisting of hydrogen, nitrogen and oxygen, and zero or more elements from the group consisting of silicon and carbon. The light blocking layer has an optical density per unit thickness approximately equal to or greater than 3 OD/micron for visible light and a sheet resistivity approximately equal to or greater than 10.sup.10 ohms/square.

REFERENCES:
patent: 4723838 (1988-02-01), Aoki et al.
patent: 4799773 (1989-01-01), Sterling
patent: 4868616 (1989-09-01), Johnson et al.
patent: 4941735 (1990-07-01), Moddel et al.

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