Patent · US Expired

Process and apparatus for displaying an image in front of an optical contrasting background

US4269480A · kind A · utility

1Cited by

3References

9Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Hans Krueger · Munich, DE
Alois Schauer · Kleinmachnow, DE
Karl-Heinz Walter · Adelaide, AU

Key dates

Filing date	Nov 17, 1978
Grant date	May 26, 1981
Priority date	—
Expiry date	Nov 17, 1998

Classification

Technology area (CPC G)Physics
CPC primaryG09F13/20
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The present invention is directed to a process and display for producing an image in front of an optically contrasting background. The display installation is characterized by a preferably but not necessarily, plate-shaped body having exit windows for emitting light in given areas and light valves associated with each of the exit windows for controlling the light being emitted therefrom. The light valves include filters which have an absorption frequency range and the plate member emits light from the exit windows in an emission frequency range. One of the members, either the filter member or the plate member, can have its associated frequency range shifted by the application of an electrical field so that light can pass through the filter without being absorbed or is absorbed by the filter.

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