Multi-digit luminescence display tube having means for supplying

Details Multi-digit luminescence display tube having means for supplying Multi-digit luminescence display tube having means for supplying

1974-07-30

1976-05-18

Demeo, Palmer C.

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

313497, 313513, H01J 166, H01J 6306, H05B 3700

Patent

active

039581500

ABSTRACT:
A multi-digit luminescence display tube comprises an anode assembly including a plurality of luminescent anode segments for each digit, a cathode, a plurality of grids disposed between the cathode and the anode segments of the respective digits, structure for supplying first voltages to the grids and to at least a selected one of the anode segments to make the same luminesce, and apparatus for superposing a second voltage on the first voltage supplied to at least a selected one of the grids to suppress luminescence at the anode segments covered thereby. The cathode comprises a common filament for the anode segments of all digits. Structure is provided for rendering the second voltage non-negative without adversely affecting the brightness of the selected anode segment which are not covered by the selected grid.

REFERENCES:
patent: 3508101 (1970-04-01), Tanji
patent: 3571655 (1971-03-01), Tanimoto
patent: 3668466 (1972-06-01), Shimada
patent: 3723789 (1973-03-01), Tanji

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