Bistable nematic liquid crystal which remains tilted in first an

Details Bistable nematic liquid crystal which remains tilted in first an Bistable nematic liquid crystal which remains tilted in first an

1997-08-12

2000-03-14

Parker, Kenneth

Liquid crystal cells, elements and systems

Particular excitation of liquid crystal

Electrical excitation of liquid crystal

349 85, 349177, 345 95, 345 89, 345 96, G02F 1133

Patent

active

060380012

ABSTRACT:
A liquid crystal display device comprises a pair of substrates opposing each other, each having an electrode and an aligning film on an inner surface, a layer of bistable nematic liquid crystal sealed in a space between substrate, and two polarizing plates. A reset pulse voltage high enough to align the molecules almost vertically to the substrates is applied to the layer of liquid crystal. Then, a first state-selecting pulse voltage lower than the reset pulse voltage is applied between the electrodes, whereby the molecules of the liquid crystal assume a first metastable aligned state. Alternatively, a second state-selecting pulse voltage lower than the reset pulse voltage is applied between the electrodes, whereby the molecules of the liquid crystal assume a second metastable aligned state. The liquid crystal molecules are tilted at an angle to the substrates in accordance with the effective value of the first state-selecting pulse voltage while remaining in the first metastable aligned state, and are tilted at a different angle to the substrates in accordance with the effective value of the second state-selecting pulse voltage while remaining in the second metastable aligned state.

REFERENCES:
patent: 4505548 (1985-03-01), Berreman et al.
patent: 4529271 (1985-07-01), Berreman et al.
patent: 4664483 (1987-05-01), Van Sprang et al.
patent: 5900852 (1999-05-01), Tanaka et al.

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