The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 1981
Filed:
Nov. 17, 1978
Siemens Aktiengesellschaft, Berlin & Munich, DE;
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.