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:
Dec. 31, 2002
Filed:
Oct. 22, 1998
Yutaka Ozawa, Minowa-Machi, JP;
Hiroaki Nomura, Chino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A liquid crystal display method is provided in which various types of display patterns can be displayed with a predetermined driving voltage margin being maintained and power consumption does not increase. Accordingly, a driving method for a liquid crystal display device is provided using liquid crystal having two metastable states. A scanning signal has a reset period, a delay period, a selection period and a non-selection period in one frame period. The selection period is set to one horizontal scanning period 1H. The scanning signal is set to reset potentials reversed at an interval of a frame period in the reset period, set to selection potentials reversed at an interval of 1H/2 in the selection period, and set to non-selection potentials in the delay period and the non-selection period. The data potential of a data signal has potentials reversed at an interval of 1H/2. When the voltage difference between the scanning signal and the data signal is applied to the liquid crystal, a voltage having one polarity is not always applied to the liquid crystal for a period exceeding a 1H period in the delay period. Therefore, various display patterns can be displayed with a predetermined driving voltage margin being maintained. Since a voltage applied to the liquid crystal in the reset period is reversed in the positive and negative sides at an interval of a period longer than 1H, power consumption does not increase.