Patent ID: 6950157
Filing Date: 2005-09-27
Classification: C09D,G02F

Abstract:
1. A display sheet comprising: a) a substrate for carrying layers of material; b) an imaging layer comprising polymer-dispersed cholesteric liquid-crystal material, such imaging layer having a first relatively higher reflection state within a portion of the visible light spectrum defining an operating spectrum and a second relatively less reflective state in said operating spectrum, wherein said states are capable of being changed by an electric field between the two states, which states are capable of being maintained in the absence of an electric field; c) a first transparent conductor disposed on one side of the imaging layer; d) a colored complementary light-absorbing layer on the other side of the imaging layer having relatively lower transmission of light within the operating spectrum of the imaging layer and having relatively greater transmission of light outside of the operating spectrum; and e) a reflective surface, optionally part of a second electrode, that reflects light transmitted through the colored complementary light-absorbing layer back to the complementary light-absorbing layer, wherein the colored complementary light-absorbing layer is capable of operating in conjunction with the reflective surface to provide a substantially neutral reflective image when the imaging layer is in the first relatively higher reflection state; and f) a second electrode.