Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1979-12-03
1984-08-14
Curtis, Marshall M.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340756, 340805, 340754, G09G 336
Patent
active
044659997
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.
REFERENCES:
patent: 3911421 (1975-10-01), Alt et al.
patent: 3973252 (1976-08-01), Mitomo et al.
patent: 3976362 (1976-08-01), Kawakami
patent: 4048633 (1977-09-01), Sano
patent: 4082430 (1978-04-01), Schulthess et al.
patent: 4127848 (1978-11-01), Shanks
Fujita Hiro
Morokawa Shigeru
Tsuzuki Akira
Citizen Watch Company Limited
Curtis Marshall M.
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