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:
Feb. 10, 2009
Filed:
Nov. 15, 2004
Katsunori Yamazaki, Matsumoto, JP;
Shoichi Iino, Nirasaki, JP;
Katsunori Yamazaki, Matsumoto, JP;
Shoichi Iino, Nirasaki, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
To effectively reduce or prevent the deterioration of display quality caused by the errors included in the current supplied to an electro-optical element a pixel circuit includes a capacitor C, transistors Tand Tthat constitute a current mirror, and an organic EL element OLED. When a first driving mode is set, the transistor Tfunctions as a programming element that writes data in the capacitor Cin accordance with data current Idata and the second transistor Tfunctions as a driving element that generates driving current Ioled in accordance with data stored in the capacitor C. When the second driving mode that is alternately switched to the first driving mode in a predetermined period is set, the transistor Tfunctions as the programming element and the transistor Tfunctions as the driving element.