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:
Aug. 10, 2004
Filed:
Jun. 21, 2002
Shigeo Nishitoba, Tokyo, JP;
Koichi Iguchi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a current driver circuit that is applicable to an organic EL (electroluminescent) image display device, the current driver circuit is provided for reducing the influence of variation between transistors that constitute a current mirror circuit while using the current mirror circuit. In the current driver circuit, a third and fourth transistor that operate in a linear region (non-saturation region) are provided between the power supply line and the sources of a first and second transistor that constitute the current mirror circuit; whereby the influence of variations between the threshold voltages of the first and second transistors can be mitigated. The gates of the third and fourth transistors are connected to the gates of the first and second transistors, respectively.