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:
Sep. 18, 2007
Filed:
Jun. 22, 2004
Fumihiko Kato, Tsuruoka, JP;
Fumihiko Kato, Tsuruoka, JP;
NEC Electronics Corporation, Kanagawa, JP;
Abstract
A display control circuit disclosed includes a selector circuit, an operational amplifier controlling circuit and an operational amplifier. The selector circuit is connected to a digital image data signal line to output an analog signal of the amplitude corresponding to input digital image data. The operational amplifier controlling circuit is connected to the digital image data signal line to output control signals of the polarity according to the input digital image data. The operational amplifier includes a first input stage and a second input stage, made up by complementary connection of differential transistor pairs of opposite conductivity types, and is designed to selectively turn on a first constant current source supplying the bias current to the first input stage or a second constant current source supplying the bias current to the second input stage depending on the polarity of the control signal.