Method of and apparatus for a multimode image display with a liq

Details Method of and apparatus for a multimode image display with a liq Method of and apparatus for a multimode image display with a liq

1981-06-30

1983-04-05

Corbin, John K.

350347E, G02F 1133

Patent

active

043789552

ABSTRACT:
Method of and apparatus for operating an image display system using a hybrid field effect liquid crystal light valve of the type wherein the molecules of the nematic liquid crystal layer are helically twisted through an acute angle. A polarized projection beam is oriented with its polarization direction within the acute twist angle and applied to a reflective face of the light valve. A writing light input image is applied to a photoresponsive opposite face in order to modulate the reflected projection beam. An electric field applied across the light valve is adjusted between two levels to produce either a simultaneous display of multicolor symbology and achromatic (black-white) gray scale images or a separate display of either one of them.

REFERENCES:
patent: 3694053 (1972-09-01), Kahn
patent: 3784280 (1974-01-01), Bigelow
patent: 3785721 (1974-01-01), Harsch
patent: 4019807 (1977-04-01), Boswell et al.
patent: 4127322 (1978-11-01), Jacobson et al.
Goscianski, "Optical Characteristics of Twisted Nematic Liquid Crystals; Application to the Improvement of the Scanning Capability Inmatrix Displays", Journal of Applied Physics, vol. 48, pp. 1426-1431, Apr. 1977.
Shimomjura et al., "Voltage Controllable Color Formation with a Twisted Nematic Liquid Crystal Cell", Japan, J. Appl. Phys., vol. 14, pp. 1093-1094, 1975.

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