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:
Dec. 20, 2005
Filed:
May. 11, 2004
Harold Feldman, Lawrence, NY (US);
Yoel Ganor, Jerusalem, IL;
Harold Feldman, Lawrence, NY (US);
Yoel Ganor, Jerusalem, IL;
Live Wire Enterprises, Inc., Lawrence, NY (US);
Abstract
An electroluminescent (EL) device achieves a significant increase in the lifetime of EL light sources by using a driver having a standard DC-to-AC inverter generating a high-frequency quasi-sinusoidal signal, and a generator of low-frequency rectangular pulses. The inverter and the generator are connected so that the quasi-sinusoidal signal is fed to the EL light source in packets. The duration of a packet is equal to the duration of the rectangular pulse. The duration of the rectangular pulses and of the packets remains constant during the entire operating cycle of the EL light source. The duration of intervals between rectangular pulses and between packets is variable, causing changes in the duty cycle, and is determined by the signal passing through a feedback circuit having an EL light source, a photosensitive element, an amplifier, and an input of the rectangular signal generator.