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:
Feb. 08, 1977
Filed:
Jun. 18, 1975
Raymond Vuilleumier, Neuchatel, CH;
Abstract
Disclosed is a light emitting diode display system powered by ambient light. This solid state electronic display device comprises an ambient irradiated photovoltaic battery energizing through an electronic adapter circuit light emitting diodes selectively chosen to display the desired information. The adapter circuit transforms the electrical power continuously supplied by the photovoltaic battery into energy pulses which are periodically applied to the display. In addition, the adapter circuit automatically adjusts the display brightness in accordance with the ambient illumination level. At low and zero light levels, the electronic display device maintains a visible display by deriving power from a secondary energy source.