Display apparatus having a plurality of display elements

Details Display apparatus having a plurality of display elements Display apparatus having a plurality of display elements

1985-12-06

1988-02-23

Birmiel, Howard A.

Communications: electrical

Visual indication

Movable

340805, 340752, G09F 933, G09G 314

Patent

active

047273674

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.

REFERENCES:
patent: 3728714 (1973-04-01), Kolesar et al.
patent: 3787752 (1974-01-01), Delay
patent: 4441106 (1984-04-01), Jackson

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