Patent · US Expired

Device for displaying colors produced by controllable cholesteric color filters

US5686931A · kind A · utility

111Cited by

16References

12Claims

0Family size

Assignee

ROLIC AG · CH

Inventors

Jurg Funfschilling · Basel, CH
Martin Schadt · Seltisberg, CH
Hubert Seiberle · Lörrach, DE

Key dates

Filing date	Nov 3, 1995
Grant date	Nov 11, 1997
Priority date	—
Expiry date	Nov 3, 2015

Classification

Technology area (CPC G)Physics
CPC primaryG02F2203/34
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Colors are generated in the display device by guiding light through three serially-arranged, electrically controlled color filters. Each filer attenuates one of three colors. The color filters incorporate two cholesteric filters, two .lambda./4 plates, and one electrically switchable liquid crystal display.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.