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:
Feb. 18, 1997
Filed:
Sep. 26, 1995
Susumu Ohi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An active matrix liquid crystal display apparatus comprises a liquid crystal panel having a plurality of pixel electrodes, a vertical driver circuit and upper and lower horizontal driver circuits for driving the liquid crystal panel. A sample hold circuit receives a video signal for level-shifting, amplifying and holding the received video signal and outputs a reduced frequency signal, and a gamma conversion circuit receives an output of the sample hold circuit for gamma-converting the received signal. A data inverting circuit receives an output of the gamma conversion circuit for selectively generating a data signal inverted in comparison with a predetermined constant voltage and a non-inverted data signal. A controller controls vertical driver circuit, the upper and lower horizontal driver circuits, the sample hold circuit, the gamma conversion circuit and the data inverting circuit. The data signals in the same phase or in an opposite phase are supplied to the upper and lower horizontal driver circuits, respectively.