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:
Dec. 31, 2002
Filed:
Dec. 08, 1999
Kuo-Chan Huang, Hsinchu, TW;
Industrial Technology Research Institute, Taiwan, TW;
Abstract
The present invention generally relates to a high matching precision organic light emitting diode (OLED) driver by using a current-cascaded method, and more particularly, to a method in which the current-cascaded method is used so as to reduce the driving current mismatching brought about by the drifting in the parameters during different fabrication procedures, and thus improve the display quality. Among the plurality of driving integrated circuits (IC's), the internal circuit of each IC comprises a first operational amplifier, the output of which is connected to a plurality of output transistors that are further connected to a current mirror. The outputs of said plurality of output transistors are connected to other plurality of driving IC's respectively so as to achieve output current matching between other driving IC's.