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:
Jan. 22, 2013
Filed:
Jan. 13, 2011
Hiroyuki Nakamura, Atsugi, JP;
Hiroyuki Nakamura, Atsugi, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A light emitting element driving circuit for driving a light emitting element in accordance with a differential data signal for causing the light emitting element to turn on or turn off is provided. The circuit includes a first transistor, a first constant current source connected to a drain and gate of the first transistor and configured to supply a constant current through the drain and source of the first transistor, a second transistor configured to supply a certain current, and a control circuit configured to electrically connect or disconnect the gate of the first transistor to or from a gate of the second transistor via a first resistor. The control circuit may supply, to the gate of the second transistor, an intermediate potential in accordance with the other of the differential data signals, while the gate of the first transistor is electrically disconnected from the gate of the second transistor.