Retardation compensation system and liquid crystal projector...

Details Retardation compensation system and liquid crystal projector... Retardation compensation system and liquid crystal projector...

2006-07-18

2006-07-18

Schechter, Andrew (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S008000, C349S117000

Reexamination Certificate

active

07079209

ABSTRACT:
Three retardation compensators are provided for compensating the retardation of liquid crystal devices for red, green and blue light, respectively. Each of the retardation compensators is composed of plural high and low refractive index thin film layers alternately layered on a substrate. Because of the difference in the wavelength dependences of the liquid crystal device and the retardation compensator, the retardation R2of the retardation compensator becomes much larger than the retardation R1of the liquid crystal device in short wavelength region of the visible band. In order to match the retardation, the thickness of the retardation compensator for blue light is smaller than those for red and green light.

REFERENCES:
patent: 5157523 (1992-10-01), Yamagishi et al.
patent: 5638197 (1997-06-01), Gunning, III et al.
patent: 6590707 (2003-07-01), Weber
patent: 2002/0018162 (2002-02-01), Suzuki et al.
patent: 2002-31782 (2002-01-01), None
patent: 2002-131750 (2002-05-01), None
J. P. Eblen, Jr., “17.4: Birefringent Compensators for Normally White TN-LCDs,” Symposium Digest, Society for Information Display, 1994, pp. 245-248.

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