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

G - Physics

09

G

315/29, 375/47

G09G 3/00 (2006.01) H05B 41/392 (2006.01)

Patent

CA 1137664

6AU-903 A BRIGHTNESS CONTROL CIRCUIT FOR A VACUUM FLUORESCENT DISPLAY ABSTRACT OF THE DISCLOSURE 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.

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