Patent ID: 7564518
Filing Date: 2009-07-21
Classification: G02F

Abstract:
1. A reflective display comprising: a. a front circular polarizer, and b. a cholesteric display cell structure with at least one controllable planar texture area and one controllable focal conic texture area, and c. a back reflective circular polarizer, wherein the front circular polarizer has exactly opposite polarity both to the Bragg reflection from the cholesteric display cell structure and to the back reflective circular polarizer: in planar texture area, the front circular polarizer substantially eliminates the Bragg reflection from the cholesterics and the reflection from the back reflective circular polarizer, in focal conic texture area, due to the depolarization effect, the circular polarizers lead the front light passing through and emerging to the viewer, whereby a black optical state takes on the controllable planar texture area, and a white optical state takes on the controllable focal conic texture area.