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:
Aug. 14, 1984
Filed:
Dec. 03, 1979
Citizen Watch Company Limited, Tokyo, JP;
Abstract
A method of cyclically driving an electro-optical display device having a matrix array of a plurality of row electrodes and a plurality of column electrodes, wherein said column electrodes intersect with said row electrodes to provide a plurality of display elements at intersections between said row and column electrodes, comprising the steps of: applying row drive signals to said row electrodes, respectively; and applying one of first, second and third column drive signals to each of said column electrodes, with said first column drive signal inducing a non-display state at all of the display elements along each column electrode, said second column drive signal inducing a non-display state at a single display element along said each column electrode and inducing a display state at the other two display elements along said each column electrode, and said third column drive signal inducing a display state at all of the display elements along said each column electrode; wherein each of said row drive signals takes a plurality of voltage potentials during a half cycle period divided into prescribed time intervals and one of said row drive signals takes one of said voltage potentials different from those of the other of said row drive signals during each of said prescribed time intervals; and wherein said first column drive signal takes a reference voltage potential equal to the mean value of said voltage potentials of said row drive signals during said prescribed time intervals of said half cycle period, said second column drive signal takes a first voltage potential different from those of said row drive signals during one of said prescribed time interval, said reference voltage potential during another one of said prescribed time intervals, and a second voltage potential different from those of said row drive signals during another one of said prescribed time intervals, and said third column drive signal takes the first and second voltage potentials during each of said prescribed time intervals.