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:
Mar. 06, 2012
Filed:
Dec. 18, 2008
Charles I. Levey, West Henrietta, NY (US);
Felipe A. Leon, Rochester, NY (US);
John W. Hamer, Rochester, NY (US);
Gary Parrett, Rochester, NY (US);
Christopher J. White, Avon, NY (US);
Charles I. Levey, West Henrietta, NY (US);
Felipe A. Leon, Rochester, NY (US);
John W. Hamer, Rochester, NY (US);
Gary Parrett, Rochester, NY (US);
Christopher J. White, Avon, NY (US);
Global OLED Technology LLC, Herndon, VA (US);
Abstract
An electroluminescent (EL) subpixel driven by a digital-drive scheme has a readout transistor driven by a current source when the drive transistor is non-conducting. This produces an emitter-voltage signal from which an aging signal representing the efficiency of the EL emitter can be computed. The aging signal is used to determine the loss in current of the subpixel when active, and an input signal is adjusted to provide increased on-time to compensate for voltage rise and efficiency loss of the EL emitter. Variations due to temperature can also be compensated for.