Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Patent
1978-07-14
1979-06-19
Smith, Alfred E.
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
315105, 315107, H05B 3700, H05B 3900, H05B 4100
Patent
active
041587944
ABSTRACT:
A vacuum fluorescent display system for displaying a plurality of illuminable characters includes a plurality of segmented anodes, at least one cathode filament, a plurality of control grids interposed between the anodes and the cathode filament and circuitry for controllably powering the cathode filament and for sequentially driving the control grids whereby selected segments of the anodes are sequentially illuminated and the luminous intensity of the segments of each of the anodes is substantially the same. The cathode filament is controllably powered by removing and applying heating power in response to driven and undriven states respectively of the control grids. By controlling when heating power is applied to the cathode filament the voltage along the cathode filament is the same for each anode when the selected anode segments are sequentially illuminated thereby substantially eliminating variation in luminous intensity.
REFERENCES:
patent: 4045704 (1977-08-01), Kishino et al.
patent: 4049993 (1977-09-01), Kishino et al.
P. R. Mallory & Co. Inc.
Smith Alfred E.
Wise Robert E.
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