Patent ID: 6577364
Filing Date: 2003-06-10
Classification: G02F

Abstract:
A reflective liquid crystal device, comprising:a linear polariser; a polarisation preserving reflector, and at least two retarders including a first retarder disposed between the polariser and the reflector and a second retarder disposed between the first retarder and the reflector, at least one of the first and second retarders including an untwisted liquid crystal layer which is switchable to achieve a non-reflective state of the liquid crystal device, in which the total retardation of the at least two retarders is equal to (2n+1)&lgr;/4, where n is an integer and &lgr; is a wavelength of visible light, and a reflective state of the reflective liquid crystal device, wherein an optic axis of the liquid crystal layer is switched so as to vary the retardation.