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. 27, 2011
Filed:
Jun. 16, 2009
Somei Kawasaki, Saitama, JP;
Somei Kawasaki, Saitama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Provided is a drive circuit for a light emitting device, which compensates for a decrease in luminance of the light emitting device and reduces a burn-in phenomenon. The drive circuit includes: a first capacitor connected to a gate of a drive transistor; and a second capacitor formed between the first capacitor on a side to which the gate of the drive transistor is not connected, and one end of a light emitting device. The drive circuit corrects an amount of charge of the first capacitor according to a change in potential of the node when the light emitting device starts illumination, and then, causes the light emitting device to illuminate according to the corrected amount of charge.