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US 4,727,367 AGranted
Display apparatus having a plurality of display elements
AssigneeKabushiki Kaisha Toshiba
InventorTomimitsu Noda
Life of this patent
Estimating the term…
Abstract
A display apparatus including a display device which is formed with a plurality of display elements. A drive circuit supplies a drive voltage from a rectified AC commercial supply voltage to the individual display elements. A control circuit controls the drive circuit to sequentially energize the display elements over a phase angel of the AC supply which minimizes differences in the voltage applied across the individual display elements, thus avoiding flickering in the display of the display device even if fluctuations of the drive voltage applied to the display elements occur.
Claims6
A display apparatus comprising:
- means for displaying information, said displaying means including a plurality of display elements;
- means for selectively supplying a drive voltage, rectified and proportional to commercial AC line voltage, across individual display elements of said display means;
- and
- drive control means for controlling said supplying means to sequentially apply voltage across said display elements, each of said display elements being energized once over a selected phase angle of n.pi./2 radians, where n is an integer, of the commercial AC line voltage, said selected phase angle minimizing differences in the drive voltage applied across said individual display elements during a display operation thereby minimizing visible flickering of the display.
1 more element
Dependencies are inferred from the claim text.