Patent ID: 7084939
Filing Date: 2006-08-01
Classification: C09K,G02F

Abstract:
1. A normally white supertwist nematic liquid crystal display comprising: a reflector, a layer of chiral nematic liquid crystal having a front aligning surface facing a light source and a rear aligning surface facing the reflector, said nematic liquid crystal having an optical retardation (Δnd) of the layer and a distribution of directors, wherein said chiral nematic liquid crystal has a twist angle (Φ) between an alignment direction of a director at the front aligning surface and an alignment direction of a director at the rear aligning surface; and a front polarizer disposed between the layer of the chiral nematic liquid crystal and the light source, said front polarizer has a transmission axis forming an angle (α) with the alignment direction of the director at the front aligning surface of the chiral nematic liquid crystal layer; wherein the optical retardation (Δnd) and the angle (α) are defined by the following formulas: wherein the front polarizer is made out of an optically anisotropic dichroic thin crystal film material which comprises aromatic rings and has an intermolecular spacing of 3.4±0.3 Å in the direction of one of optical axes.