Liquid crystal projector

Details Liquid crystal projector Liquid crystal projector

1998-08-19

1999-10-26

Dang, Hung Xuan

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

349 8, 349132, 349 99, 349121, G02F 11335

Patent

active

059737590

ABSTRACT:
A liquid crystal projector having a high contrast ratio has an optical system including, for each color, a liquid crystal display device, a drive device for driving the liquid crystal display device and a polarization device, and a light source. The liquid crystal display device has active devices connected to reflective electrodes. Driving voltages applied to pixels have different polarities in every row. The liquid crystal layer is aligned at an angle from 75.degree. to 105.degree. to the direction of an electric field between electrodes. An optical rotator is provided between the liquid crystal display device and the polarization device.

REFERENCES:
patent: 5092664 (1992-03-01), Miyatako et al.
patent: 5267029 (1993-11-01), Kurematsu et al.
patent: 5570209 (1996-10-01), Usui et al.

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