Color liquid crystal display device with optical axes of retarda

Details Color liquid crystal display device with optical axes of retarda Color liquid crystal display device with optical axes of retarda

1996-03-25

1998-04-07

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349 99, 349106, 349113, 349121, G02F 11335

Patent

active

057370478

ABSTRACT:
A color liquid crystal display device comprises a liquid crystal cell having liquid crystal molecules twisted by 90.degree., two polarization plates, a reflector and two retardation plates. The product .DELTA.n.d of the refractive anisotropy .DELTA.n and the LC layer thickness d of the liquid crystal cell, the retardations of the retardation plates, the directions of the transmission axes of the polarization plates and the phase delay axes of the retardation plates are set in such a way that the color of outgoing light changes to red, green, blue, black or white in accordance with an applied voltage. The transmission axis of one of the polarization plates is set in a direction of 110.degree. to 130.degree. in an opposite direction to the twist angle of the liquid crystal molecules and the transmission axis of the other of the polarization plates is set in a direction of 127.degree. to 140.degree. in an opposite direction to this twist angle.

REFERENCES:
patent: 4995704 (1991-02-01), Yamamoto et al.
patent: 5032008 (1991-07-01), Yamamoto et al.
patent: 5296955 (1994-03-01), Tsujioka
patent: 5548426 (1996-08-01), Miyashita et al.

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