Display bias arrangement

Details Display bias arrangement Display bias arrangement

1991-02-20

1993-06-01

Pascal, Robert J.

Electric lamp and discharge devices: systems

Plural load device systems

Plural discharge device loads

315 96, 315 99, 315185R, H05B 3700

Patent

active

052163342

ABSTRACT:
An improved display bias arrangement is provided using a DC filament voltage in conjunction with stepped grid voltages to maintain even illumination. In a VF display there is a directly heated cathode (filament), an anode and a grid. If a DC filament voltage is used, one end of the cathode will be at different potential than the other, thus resulting in a variation in anode-to-cathode potential across the display. This varying potential causes electrons to hit the anode with varying speed, causing a variation in display intensity. In this invention, the cathode (filament) is supplied with a DC voltage and the grid of each segment is supplied with a different voltage, thereby equalizing the anode-to-cathode potential for each display digit. In a first embodiment, resistor networks are used to equalize the anode-to-cathode voltages. In a second embodiment, diode networks are used to equalize the anode-to-cathode voltages.

REFERENCES:
patent: 1801022 (1931-04-01), Poncel
patent: 1807343 (1931-05-01), Poncel
patent: 2043676 (1936-06-01), Raskhodoff
patent: 2535147 (1950-12-01), Markusen
patent: 2539127 (1951-01-01), Glass
patent: 4859912 (1989-08-01), Lippman

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