Electro-optical device defined by relationship of data voltage,

Details Electro-optical device defined by relationship of data voltage, Electro-optical device defined by relationship of data voltage,

1994-12-16

1997-01-28

Gross, Anita Pellman

Liquid crystal cells, elements and systems

Particular excitation of liquid crystal

Electrical excitation of liquid crystal

345 90, 345 92, 349 38, 349172, 349174, G02F 1133, G02F 11343, G02F 113, G09G 336

Patent

active

055982840

ABSTRACT:
A liquid crystal electro-optical device has electrodes, a pair of substrates at least one of which is transparent, thin-film transistors provided on one of the pair of substrates, and a ferroelectric or antiferroelectric liquid crystal material, or a ferroelectric or antiferroelectric liquid crystal material mixed with a polymer compound held between the pair of substrates. A particular relationship is established between spontaneous polarization of the liquid crystal material, a capacitance between pixel electrodes, a pulse voltage applied to gates of the transistors, a time constant of a pixel, a residual pixel voltage immediately before application of the next pulse, and other parameters.

REFERENCES:
patent: 4815823 (1989-03-01), Kaneko
patent: 5227900 (1993-07-01), Inaba et al.
patent: 5363225 (1994-11-01), Minamihara et al.
patent: 5465168 (1995-11-01), Koden et al.
patent: 5473449 (1995-12-01), Takemura et al.
Armitage, "Gray Scale Ferroelectric Liquid Devices", Liquid Crystal Displays and Applications, Proceedings SPIE-The International Soc. for Optical Engineering, vol. 1257, 1990, pp. 116-124.
Hartmann, "Charge-Controlled Phenomena in the Surface-Stabilized Ferroelectric Liquid Crystal Structure", Journal of Applied Physics, vol. 66, No. 3, 1989, pp. 1132-1136.

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