Isolated pixel liquid crystal light valve structure

Details Isolated pixel liquid crystal light valve structure Isolated pixel liquid crystal light valve structure

1989-10-13

1991-12-31

Hille, Rolf

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

357 15, 357 30, 359 79, 359 84, 359 71, G02F 113

Patent

active

050766708

ABSTRACT:
A photoconductive substrate is provided to voltage modulate a liquid crystal layer in response to input light. The substrate is partitioned into electrically isolated pixels to eliminate lateral spread of charge carriers therein, and increase the dynamic range of the liquid crystal light valve while preserving resolution. The substrate is partitioned by forming an interconnecting network of deep trenches in a surface thereof, and filling the trenches with an insulating material such as silicon dioxide. The opposite surface of the substrate is etched away to expose the silicon dioxide in the trenches, thereby providing the substrate with partitions which extend completely therethrough between the opposite surfaces.

REFERENCES:
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patent: 4881110 (1989-11-01), Braatz et al.
patent: 4913531 (1990-04-01), Efron et al.
patent: 4973136 (1990-11-01), Braatz
U. Efron et al., "The Silicon Liquid-Crystal Light Valve", J. Appl. Phys., 57(4), Feb. 15, 1985, pp. 1356-1368.

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