Method and apparatus for increasing contrast ratio of the stored

Details Method and apparatus for increasing contrast ratio of the stored Method and apparatus for increasing contrast ratio of the stored

1976-07-28

1978-08-15

Pendegrass, Verlin R.

Static information storage and retrieval

Magnetic bubbles

Guide structure

365108, G02F 113

Patent

active

041068530

ABSTRACT:
A method and apparatus for increasing the contrast ratio of the output image from a cholestericnematic (storage mode) light valve. The increase in contrast ratio is achieved by applying a low amplitude voltage across the cell at an erasing frequency thereby causing increased scattering of light in the stored image areas and decreased scattering in the clear area.

REFERENCES:
patent: 3652148 (1972-03-01), Wysocki
patent: 3680950 (1972-08-01), Haas
patent: 3806230 (1974-04-01), Haas
patent: 3947183 (1976-03-01), Haas
patent: 3976361 (1976-08-01), Fraas
patent: 3991416 (1976-11-01), Byles
patent: 4005032 (1977-01-01), Haas
patent: 4009934 (1977-03-01), Goodwin
Wild, et al.; "Turn-On Time Reduction & Contrast Enhancement in Matrix-Addressed Liquid Crystal Light Valves"; Applied Physics Letters, vol. 19, No. 9, Nov. 1, 1971.

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