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:
Jul. 25, 2006
Filed:
May. 27, 2004
Alf Burau, Aschaffenburg, DE;
Heinrich Noll, Gross-Umstadt, DE;
Peter Schilling, Karlstein, DE;
Jürgen Wenning, Mainaschaff, DE;
Alf Burau, Aschaffenburg, DE;
Heinrich Noll, Gross-Umstadt, DE;
Peter Schilling, Karlstein, DE;
Jürgen Wenning, Mainaschaff, DE;
Siemens Aktiengesellschaft, München, DE;
Abstract
A method for driving an electroluminescent lamp to emit light at a brightness set level includes providing a variable bias voltage to the electroluminescent lamp. The variable bias voltage is increased with the duration of the on-time of the electroluminescent lamp. To stabilize the electroluminescent lamp at the brightness set level against aging, a closed loop control of the brightness of the electroluminescent lamp is applied, which is subject to said duration of the on-time the electroluminescent lamp.