Patent ID: 6784955
Filing Date: 2004-08-31
Classification: G02F

Abstract:
A liquid crystal display comprisinga) liquid crystal cell having top and bottom alignment layers with rubbing directions between them that favor a twist angle of Â±22Â±5Â° to define a first stable state; b) an input polarizer with an angle of Â±45Â±5Â° relative to the rubbing direction of an adjacent alignment layer and an output polarizer at an angle of Â±68Â±5Â° relative to said rubbing direction; and c) a chiral dopant added to the liquid crystal layer of the liquid crystal cell such that a ratio of a thickness of the liquid crystal layer and a pitch of the liquid crystal twist is between 0.19Â±0.1 to define a second stable state; d) the thickness times birefringence of the liquid cell is 0.27Â±0.1 &mgr;m.