Twisted nematic display with cholesteric reflector

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Abstract
A new reflection mode twisted nematic liquid crystal display scheme is described that uses only one-sheet-type polarizing filter. In this scheme the reflector and the second polarizer of the conventional twisted nematic display are replaced by a combination of a quarter-wave plate and a cholesteric liquid crystal layer. This combination is equivalent to a combination consisting of a linear polarizer, a colour filter and a diffuse reflector. The display scheme shows either black characters against an unusually brilliant iridescent background or the converse situation of iridescent characters against a black field. The performance of this new display scheme is compared to the conventional twisted nematic reflective mode display.