Importance

Loading Importance Indicators...

Abstract

A normally white twisted nematic liquid crystal display (LCD) includes a liquid crystal layer for twisting at least one normally incident wavelength of visible light when in the off-state. Front and rear orientation layers sandwich the liquid crystal layer therebetween with the front orientation layer causing a front liquid crystal tilt sense direction A.sub.F and the rear orientation layer causing a rear liquid crystal tilt sense direction A.sub.R different than the direction A.sub.F. Rear and front tilted retardation layers are located on opposite sides of said liquid crystal layer. Each of the rear and front tilted retardation layers has an optical axis defining an azimuthal angle .phi., and a tilt angle .theta., where at least the tilt angle .theta. varies through the thickness of the layer. The azimuthal angle aspect .phi. of an optical axis of the rear tilted retardation layer is oriented substantially anti-parallel relative to the rear tilt sense direction A.sub.R of liquid crystal molecules proximate the rear orientation layer, and the azimuthal angle aspect .phi. of an optical axis of the front tilted retardation layer is oriented substantially parallel relative to the front tilt sense direction A.sub.F of liquid crystal molecules proximate the front orientation layer. At least one of the rear and front tilted retardation layers includes a tilt angle .theta. which is substantially greater on the side of the tilted retardation layer closest to the liquid crystal layer than on the side furthest from the liquid crystal layer.

Loading the Abstract Image...

First Claim