Apparatus for improving the angle of view in a liquid crystal di

Details Apparatus for improving the angle of view in a liquid crystal di Apparatus for improving the angle of view in a liquid crystal di

1991-02-04

1992-09-22

Howell, Janice A.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 73, G02F 11335

Patent

active

051502356

ABSTRACT:
In a polychromatic liquid crystal display, apparatus and method for improving the off-axis viewing characteristics are described. The angle of view can be expanded by appropriate selection of the thickness and the birefringence parameter of the liquid crystal material as a function of the color of the liquid crystal display pixel. In order to improve further the angle of view, retardation films are used to reduce the angular dependence of the radiation. The retardation films reduce the background light leakage by compensating for the change in retardation of the liquid crystal display at angles other than normal to the display. The reduction in the background light leakage results in improved contrast ratio and chromaticity.

REFERENCES:
patent: 4385806 (1983-05-01), Fergason
patent: 4852976 (1989-08-01), Suzuki
patent: 4984874 (1991-01-01), Yamamoto et al.
patent: 5032008 (1991-07-01), Yamamoto et al.

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