Brightness control for a vacuum fluorescent display

Details Brightness control for a vacuum fluorescent display Brightness control for a vacuum fluorescent display

1983-06-06

1985-01-22

Dixon, Harold

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

3151694, 315209R, 315287, 315DIG4, 340767, 340813, H05B 3700

Patent

active

044954450

ABSTRACT:
A vacuum fluorescent display is provided with control means for turning on the display elements by means of a control signal which is in phase with the AC voltage supplied to the cathode of the display. The control signal has a duty cycle which is symmetrical about the zero crossing points of the AC voltage. As a result, the display produces light output only during time periods that are symmetrical about the zero crossings of the AC voltage. In this manner, uniform brightness of the display is perceived.

REFERENCES:
patent: 4090189 (1978-05-01), Fisler
patent: 4158794 (1979-06-01), Sandler
patent: 4241294 (1980-12-01), Fisler
patent: 4358713 (1982-11-01), Senoo

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