Optical device including a spatial optical modulator and an opti

Details Optical device including a spatial optical modulator and an opti Optical device including a spatial optical modulator and an opti

1995-06-20

1998-03-17

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

Liquid crystal for recording or imaging on photosensitive...

349 25, G02F 113, G02F 1135

Patent

active

057293058

ABSTRACT:
A lens is arranged to form a spatially varying intensity distribution at a photoreceptor within a pixel region so as to form a charge pattern thereon. The photoreceptor is associated with a liquid crystal device such that the presence of a suitable recording voltage across the photoreceptor and liquid crystal device causes regions of the liquid crystal device to switch to an opaque state when the light intensity on an associated region of the photoreceptor exceeds a threshold value l.sub.th. Removal of the recording voltage allows the image held in the liquid crystal device to be stored in a non-volatile manner and to be replayed by illumination with a read beam. An analog image having a grey scale can be reproduced from the pixel region. A plurality of pixel regions can be provided as an array so as to record and replay monochrome images.

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Jared et al, Optics Letters, Jun. 15, 1991, vol. 16, No. 12, pp. 967-969, "Optically Addressed Thresholding Very-Large-Scale-Integration/Liquid-Crystal Spatial Light Modulators".
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Killinger et al, Applied Optics, 31 (1992) Jul. 10, No. 20, New York, vol. 31, "Bistability and Nonlinearity in Optically Addressed Ferroelectric Liquid-Crystal Spatial Light Modulators: Applications to Neurocomputing".
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Yu, "Microcomputer-Based Programmable Optical Correlator for Automatic Pattern Recognition and Identification", Jun. 1986/vol. 11, No. 6/Optical Letters, pp. 395-397.

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