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. 08, 2004
Filed:
Jan. 24, 2002
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention suppresses the increase of consumptive electricity derived from the alternation timing driving of a passive matrix type liquid crystal display device such as an STN system or the like. According to the present invention, the liquid crystal display device which is driven by applying selection voltages to common electrodes during a scanning period of the common electrodes and by applying non-selection voltages during other periods to the common electrodes includes a switching circuit which temporarily short-circuits the common electrode n and the common electrode m during a period shifting from the scanning period of the common electrode n to the scanning period of the common electrode m which succeeds the scanning period of the common electrode n, and makes use of the charge stored in the common electrode n by the application of the selection voltage during the scanning period of the common electrode n for charging the common electrode m.