Patent ID: 6788362
Filing Date: 2004-09-07
Classification: G02F

Abstract:
A display having polymer dispersed liquid crystals, comprising:a) a transparent substrate; b) a state changing layer comprising a polymer-dispersed cholesteric liquid crystal disposed over the transparent substrate and defining first and second surfaces, the first surface being nearer the transparent substrate, such state changing layer of polymer-dispersed cholesteric liquid crystal having more than one stable optical state in the absence of an electrical field; c) a first transparent conductor disposed on the same side of the display as the first surface of the state changing layer, between the state changing layer and the transparent support; d) a second conductor over the second surface of the state changing layer such that when an electric field is applied between the first and second conductors, the cholesteric liquid crystals change state; and e) an electrically non-conductive, non-field-spreading layer comprising pigment particles in a binder disposed between the state changing layer of polymer-dispersed cholesteric liquid crystal and the second conductor, thereby providing a light-absorbing layer.