Patent ID: 7551252
Filing Date: 2009-06-23
Classification: G02F

Abstract:
1. A bistable twisted nematic liquid crystal display, comprising: a first substrate having thereon a first conductive layer and a first alignment layer; a second substrate having thereon a second conductive layer and a second alignment layer; a liquid crystal layer in the first and second alignment layers; an alignment layer on each of the substrates, the alignment layer imparting a preferred direction for liquid crystal molecules near the alignment layer, and possessing different azimuthal and polar anchoring energies when used to align a liquid crystal layer; the alignment layers being rubbed in such a way to give a stable twist angle of the liquid crystal of φ where φ can be any value in between −45° to +45°; and wherein the d/p ratio of the liquid crystal layer is between the values of 0.15+0.5φ/π and 0.35+0.5φ/π.