Quarter wavelength plate and projection type video display...

Details Quarter wavelength plate and projection type video display... Quarter wavelength plate and projection type video display...

2006-08-15

2006-08-15

Ton, Toan (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S005000, C353S020000

Reexamination Certificate

active

07092056

ABSTRACT:
A quarter wavelength plate for reducing the dependence of a retardation value on an incident beam angle in optically anisotropic crystals. The quarter wavelength plate is formed of optically anisotropic crystals in a thickness of 0.1 mm to 0.5 mm. The quarter wavelength plate can contribute to a reduction in the dependence of the retardation value on the angle at which a light beam impinges on the quarter wavelength plate, and to a reduction in color shading caused by a rise in temperature. A reflection type liquid crystal display device which employs the quarter wavelength plate can enhance the luminance and contrast.

REFERENCES:
patent: 6331879 (2001-12-01), Sawai et al.
patent: 6783242 (2004-08-01), Hirata et al.
patent: 6958797 (2005-10-01), Kawahara et al.

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