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:
Aug. 17, 2004
Filed:
Sep. 20, 2002
Shigeki Kondo, Hiratsuka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In a drive circuit to be used for a light-emitting panel formed by a light-emitting element array having a matrix type configuration, wherein a plurality of thin film transistors are arranged for each pixel of the light-emitting element array, a circuit for canceling the offset voltage of a drive transistor is provided by arranging a memory capacitance at the input side of the light-emitting element to instantly accumulate the offset voltage of the drive transistor so as to offset the phenomenon of the voltage fall that is equal to the offset voltage when an image signal s applied at the next timing. With this arrangement, variances in the characteristic of the drive transistors can be cancelled to lessen the variances in the brightness of the light-emitting elements and improve the high speed response of the light-emitting elements.