Patent ID: 6204904
Filing Date: 2001-03-20
Classification: G02F

Abstract:
A reflective liquid crystal device, comprising:a linear polariser;a polarisation preserving reflector; anda retarder arrangement,wherein the retarder arrangement includes at least three retarders, a first of which is disposed between the polariser and the reflector, a second of which is disposed between the first retarder and the reflector, and a third of which is disposed between the second retarder and the reflector, at least one of the first, second and third retarders including a liquid crystal layer which is switchable to achieve a non-reflective state of the reflective liquid crystal device, in which the retardation of the retarder arrangement is equal to (2n+1).lambda./4 where n is an integer and .lambda. is a wavelength of visible light, and a reflective state of the reflective liquid crystal device.