Patent · US Expired

Electro-optical display device with electro-optical light valves

US4142781A · kind A · utility

36Cited by

10References

36Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Guenter Baur · Glückstadt, DE
Waldemar Greubel · Munich, DE

Key dates

Filing date	Dec 2, 1976
Grant date	Mar 6, 1979
Priority date	—
Expiry date	Dec 2, 1996

Classification

Technology area (CPC G)Physics
CPC primaryG09F9/00
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Electro-optical display device which may operate either in a one or multi-color mode and utilizes electro-optical light valves for controlling transmittance of a passive light through the device characterized by passively amplifying the brightness of the display device with the addition of a light trap which includes a fluorescent plate having mirrored edge surfaces. While the invention or improvement may be utilized with any passive optical display device, it is particularly useful with a liquid crystal display device.

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