Opto-electronic memory system

Details Opto-electronic memory system Opto-electronic memory system

1992-04-16

1993-11-16

LaRoche, Eugene R.

Static information storage and retrieval

Radiant energy

Liquid crystal

365 64, 365112, G11C 1142

Patent

active

052629805

ABSTRACT:
An electro-optic memory system includes reading means comprising a planar array of parallel linear electro-optic, e.g. LC, light shutters (16) which are illuminated with parallel light (11) and a parallel, spaced, planar array of light sensing elements, (18) e.g. thin film photodiodes, extending at right angles to the light shutters with read-out regions (20) being defined at the intersections of the shutters and sensing elements. A memory element (14) comprising a two dimensional array of memory locations in which information is stored in the form of a light transmission characteristic is disposed between the shutter and sensing element arrays with the memory locations aligned with read-out regions. Rows of memory locations are optically read, one at a time, for example in sequence, by selective operation of the light shutters by a drive circuit (42) and electrical outputs (43,45) obtained from the sensing elements (18) according to the characteristics of the corresponding row of memory locations. The memory element may comprise a photographic, photochromic or liquid crystal medium, in, for example, the form of a data card.

REFERENCES:
patent: 3515880 (1970-06-01), Letter
patent: 3703331 (1972-11-01), Goldmacher et al.
patent: 4859035 (1989-08-01), Ichinose et al.
patent: 4984198 (1991-01-01), Kobayashi et al.
patent: 5029987 (1991-07-01), Shinomiya

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