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:
Sep. 07, 2010
Filed:
May. 27, 2008
Tadahiko Hirai, Tokyo, JP;
Tadahiko Hirai, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A light emitting element circuit includes a current minor circuit having two thin film transistors, two current input terminals, and two output terminals, a capacitor for holding voltage in accordance with an electric current to be input from one of the two current input terminals, and a light emitting element connected to the current minor circuit. An electric current is supplied to the light emitting element through the current mirror circuit in accordance with the voltage held in the capacitor. The two output terminals of the current mirror circuit are connected to the light emitting element, and the two current input terminals of the current minor circuit are connected with each other through a switch in a time period other than a time period during which an electric current is input from the one of the two current input terminals. In addition, a switching circuit connects the current minor circuit to a matrix wiring, and the current minor circuit includes a switch to connect one of the two output terminals of the current minor circuit to a ground.