Brightness control circuit for a vacuum fluorescent display

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

1979-05-23

1980-12-23

Smith, Alfred E.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

3151691, 340767, H05B 3702, H05B 4139, G05F 100

Patent

active

042412943

ABSTRACT:
A circuit for controlling the brightness of a vacuum fluorescent display having filament terminals and connected to anode or segment biasing means includes a transformer having a filament winding connected to the filament terminals. The transformer is driven by a 60-cycle power source. An electronic switch, including a transistor, is connected between a center tap of the filament and the anode biasing means (at a common ground) and circuit means open and close the switch at a 60-cycle rate. The ratio of time during which the switch is closed to the time during which the switch is open is variable to control the brightness of the display.

REFERENCES:
patent: 4158794 (1979-06-01), Sandler
patent: 4190189 (1978-05-01), Fisler

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