Brightness control for a vacuum fluorescent display

G - Physics – 09 – G

Patent

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315/29, 375/47

G09G 3/00 (2006.01) G09G 3/06 (2006.01)

Patent

CA 1230691

IMPROVED BRIGHTNESS CONTROL FOR VACUUM FLUORESCENT DISPLAYS ABSTRACT OF THE DISCLOSURE 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.

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