Liquid crystal display apparatus having a particular optical com

Details Liquid crystal display apparatus having a particular optical com Liquid crystal display apparatus having a particular optical com

1989-07-11

1992-07-28

Mintel, William

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 93, 359 73, G02F 1135

Patent

active

051345072

ABSTRACT:
A twisted nematic liquid crystal display apparatus rotates the plane of polarization of the light with optical rotatory power of a liquid crystal layer. Thereby, a display operation is made by switching pass/interruption of the light by use of a pair of polarizers sandwiching the liquid crystal layer. At this time, by associating an optical compensating member whose optical anisotropy is in the opposite characteristic with a liquid crystal display device, leakage of light and coloration caused by birefringence and optical rotary dispersion in the liquid crystal layer are prevented. Further, the switching characteristic of the light over the entire visible light region is enhanced, and color display is of a high contrast ratio. Since the optical compensating member is formed of laminated and adhered plural synthetic resin films which are extended monoaxially, and twisted in the opposite direction to the twisting direction of the liquid crystal molecule on the plane, including the extending direction, the quality of display may be improved without deterioration of the advantages of the existing liquid crystal display apparatus, such as those of small size and portability.

REFERENCES:
patent: 4385806 (1983-05-01), Fergason
patent: 4408839 (1983-10-01), Wiener-Avnear
patent: 4436379 (1984-03-01), Funada et al.
patent: 4443065 (1984-04-01), Funada et al.
patent: 4466702 (1984-08-01), Wiener-Avnear et al.
patent: 4844569 (1989-07-01), Wada et al.
patent: 4909606 (1990-03-01), Wada et al.
patent: 4936654 (1990-06-01), Suzaki et al.

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