Deformed helix ferroelectric liquid crystal display device and m

Details Deformed helix ferroelectric liquid crystal display device and m Deformed helix ferroelectric liquid crystal display device and m

1993-12-03

1996-02-06

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359100, G02F 11343, G02F 113

Patent

active

054900000

ABSTRACT:
A liquid crystal display element includes one substrate on which pixel electrodes and TFTs connected to the pixel electrodes are arranged in a matrix form, the other substrate on which a counter electrode opposing the pixel electrodes is formed, and a ferroelectric liquid crystal sealed between the substrates and having a helical pitch smaller than a distance between the substrates. A row driver is connected to the TFTs to sequentially turn on the active elements. A column driver applies an initializing voltage consisting of first and second reset pulses for sequentially setting the ferroelectric liquid crystal in the first and second aligned states and a write voltage changing in accordance with the display gradation levels to the pixel electrodes through the ON active elements, thereby performing gradation display.

REFERENCES:
patent: Re33120 (1989-11-01), Nagae et al.
patent: 5073010 (1991-12-01), Johnson et al.
patent: 5109295 (1992-04-01), Sato et al.
patent: 5227900 (1993-07-01), Inaba et al.
L. A. Beresnev; "Deformed Ferroelectric Liquid Crystal Display; A New Electrooptic Mode in Ferroelectric Chiral Smectic C Liquid Crystals"; 1988; Liquid Crystals; vol. 5, No. 4, pp. 1171-1177.

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