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. 25, 2005
Filed:
Nov. 14, 2002
Hiroshi Suzuki, Yamato, JP;
Hiroshi Suzuki, Yamato, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
Accurate gradation display on an OLED display device is effectuated by reducing a kickback voltage based on parasitic capacitance of a switching TFT without increasing a capacitance of a capacitor which retains a voltage to be supplied to a driving TFT. A capacitor for maintaining on-and-off states of a driving TFT which drives an OLED is charged by a switching TFT. The capacitor is connected to a scan line, which drives a switching TFT located in a preceding stage in accordance with a scanning order. After being charged by the switching TFT, a reference potential on the capacitor is raised to compensate for a drop in a gate voltage of the driving TFT attributable to parasitic capacitance of the switching TFT, in accordance with a signal from the scan line.