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:
May. 15, 2012
Filed:
Jun. 13, 2008
Jun Sumioka, Yokohama, JP;
Kaoru Okamoto, Tokyo, JP;
Tadahiko Hirai, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A display apparatus includes a scanning line, a signal line, and a pixel circuit. The pixel circuit is selected according to a signal applied to the scanning line, and a signal is input to the selected pixel circuit from the signal line. The pixel circuit include a holding capacitor, a first switch which opens and closes connection between one terminal of the light emitting element and the signal line in accordance with a signal applied to the scanning line, and a second switch which opens and closes connection between one terminal of the holding capacitor and the signal line in accordance with a signal applied to the scanning line. First and a second voltage supplies are switchably connected to the signal line, and during a period when the pixel circuit is selected, the first voltage supply is connected to the signal line and the first switch is closed so that a voltage of the first voltage supply is applied to a terminal of the light emitting element, and the second voltage supply is connected to the signal line and the second switch is closed and the first switch is opened, so that a voltage of the second voltage supply is applied to one terminal of the holding capacitor. A voltage of the first voltage supply is determined based on a terminal-to-terminal voltage of the light emitting element when a voltage of the second voltage supply is applied to the holding capacitor and current flows in the light emitting element.