Patent ID: 6359671
Filing Date: 2002-03-19
Classification: G02F

Abstract:
A normally white twisted nematic liquid crystal display (LCD) comprising:(a) a liquid crystal layer for twisting at least one normally incident wavelength of visible light when in the off-state; (b) first and second orientation layers sandwiching said liquid crystal layer therebetween, said first orientation layer causing a first liquid crystal tilt sense direction AFirst and said second orientation layer causing a second liquid crystal tilt sense direction ASecond different than said direction AFirst; (c) second and first tilted retardation layers located on opposite sides of said liquid crystal layer; (d) each of said second and first tilted retardation layers having an optical axis defining at least one azimuthal angle &phgr;, and at least one tilt angle &thgr;, where at least said tilt angle &thgr; varies through the thickness of the layer; (e) said azimuthal angle aspect &phgr; of an optical axis of said second tilted retardation layer is oriented substantially anti-parallel relative to said second tilt sense direction ASecond of liquid crystal molecules proximate said second orientation layer, and said azimuthal angle aspect &phgr; of an optical axis of said first tilted retardation layer is oriented substantially parallel relative to said first tilt sense direction AFirst liquid crystal molecules proximate said first orientation layer; and (f) at least one of said second and first tilted retardation layers includes a tilt angle &thgr; which is substantially greater on the side of the tilted retardation layer closest to said liquid crystal layer than on the side furthest from said liquid crystal layer.