1981-03-17
1984-05-08
Corbin, John K.
350330, G02F 1137
Patent
active
044471327
ABSTRACT:
In a matrix display device having a cholesteric liquid crystal the bistability effect is used which some cholesteric liquid crystals show. The liquid crystal shows a frequency-dependent relaxation of a positive to a negative dielectric anisotropy. After writing the information the light-scattering picture elements have a focal-conical texture and the transparent elements have a homeotropic-nematic texture. The information can be stored for a longer period of time by causing the homeotropic-nematic texture of the transparent elements to change into the substantially transparent planar-conical texture. This is produced rapidly by applying across all picture elements a voltage of a frequency at which the liquid crystal has a negative dielectric anisotropy. The focal-conical texture of the light-scattering elements is substantially not disturbed by this voltage. During the presence of this voltage the written information is continuously visible.
REFERENCES:
patent: 3915883 (1975-10-01), Vanmeter et al.
patent: 3953491 (1976-04-01), Steinstrasser et al.
patent: 4009934 (1977-03-01), Goodwin et al.
patent: 4083797 (1978-04-01), Oh
patent: 4105298 (1977-04-01), Levine et al.
patent: 4212762 (1980-07-01), Dubois et al.
patent: 4230596 (1980-10-01), Beguin
patent: 4235736 (1980-11-01), Beguin
patent: 4257911 (1981-03-01), Gray et al.
patent: 4293193 (1981-10-01), Labes et al.
patent: 4293434 (1981-10-01), Deutscher et al.
patent: 4323472 (1982-04-01), Sethofer
Green et al., "Nematic Heterocyclic Diesters", IBM Technical Disclosure Bulletin, vol. 15, No. 8, Jan. 1973.
Haller et al., "Retarding Crystallization of Supercooled Nematic Liquid Crystals", IBM Technical Disclosure Bulletin, vol. 16, No. 1, Jun. 1973.
Tani et al., "Storage-Type Liquid-Crystal Matrix Display", Proceedings of the SID, vol. 21/2, 1980.
Creagh, "Nematic Liquid Crystal Materials for Displays", Proceedings of the IEEE, vol. 16, No. 7, Jul. 1973.
Goodwin, et al., "Electro-Optic Display Devices and Methods", Research Disclosure, Industrial Opportunities Ltd., Mar. 1975, pp. 28-31.
Freiser et al., "Mixture of Positive and Negative Anisotropy Nematics", IBM Technical Disclosure Bulletin, Oct. 1974, vol. 17, No. 5, pp. 1498-1501.
Corbin John K.
Lewis David
Miller Paul R.
U.S. Philips Corporation
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