Patent ID: 10287503

Abstract:
An enhanced brightness cholesteric liquid crystal eWriter device for writing and drawing includes substrates and electrically conductive layers disposed on the substrates. There is a gap, d, between the electrically conductive layers. Polymer dispersed cholesteric liquid crystal material is disposed in the gap. The polymer dispersed cholesteric liquid crystal material exhibits a written reflectance, R, which occurs in response to pressure applied to one of the substrates that changes reflectance of the cholesteric liquid crystal material. The device follows the relationship Rd1<Rd2 and d1>d2, where Rd2 is a written reflectance of an eWriter device of gap d2 and Rd1 is written reflectance of another eWriter device of gap d1. Further, a cholesteric liquid crystal eWriter device includes a layer of cholesteric liquid crystal material in a cell gap, d, wherein d<3 μm. Also included is an enhanced brightness eWriter with other features and a method of constructing an enhanced brightness, cholesteric liquid crystal eWriter.