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:
Jul. 19, 2005
Filed:
Jul. 09, 2001
Applicant:
Simon Tam, Cambridge, GB;
Inventor:
Simon Tam, Cambridge, GB;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G09G003/30 ;
U.S. Cl.
CPC ...
Abstract
A driver circuit comprises a p-channel transistor and an n-channel transistor connected as a complementary pair of transistors to provide analog control of the drive current for a current driven clement, preferably an organic electroluminescent element (OEL element). The transistors, being of opposite channel, compensate, for any variation in threshold voltage ΔVand therefore provide a drive current to the OEL element which is relatively independent of ΔV. The complementary pair of transistors can be applied to either voltage driving or current driving pixel driver circuits.