G - Physics – 09 – G
Patent
G - Physics
09
G
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.
455697
Company General Electric
Eckersley Raymond A.
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