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:
Jun. 17, 1997
Filed:
Dec. 14, 1995
Tatsuo Kamei, Mobara, JP;
Kenichi Iwamoto, Mobara, JP;
Yoshio Owaki, Mobara, JP;
Jun-ichi Ohwada, Mobara, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Device Engineering Co., Ltd., Mobara, JP;
Abstract
A method for driving a liquid crystal display device including a TFT liquid crystal display panel. The TFT liquid crystal display panel includes a plurality of pixel electrodes, a common electrode opposing the pixel electrodes, and a liquid crystal layer disposed between the pixel electrodes and the common electrode. The method includes the steps of generating a plurality of positive gradation voltages with a first voltage dividing resistor circuit, the first voltage dividing resistor circuit being a single series circuit formed by a plurality of resistors connected in series, each of the positive gradation voltages being higher than a midpoint voltage Vasc, generating a plurality of negative gradation voltages with a second voltage dividing resistor circuit, the second voltage dividing resistor circuit being a single series circuit formed by a plurality of resistors connected in series, each of the negative gradation voltages being lower than the midpoint voltage Vasc and being paired with a respective one of the positive gradation voltages, thereby providing a plurality of paired positive and negative gradation voltages, and applying the positive gradation voltages and the negative gradation voltages to the pixel electrodes in accordance with a display signal representing information to be displayed on the TFT liquid crystal display panel. Respective averages of the paired positive and negative gradation voltages are positive, and increase with respect to a reference voltage VC as respective differences between the paired positive and negative gradation voltages decrease, the reference voltage VC being lower than the midpoint voltage Vasc.