Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Patent
1977-06-29
1979-12-18
Dahl, Lawrence J.
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
313514, 340753, H05B 3700
Patent
active
RE0301728
ABSTRACT:
A bar graph display panel comprises a gas-filled envelope containing a series of fine, closely-spaced cathode lines connected in groups so that they can be energized sequentially and individually. The panel also includes an anode film supported on the face plate and aligned with and in operative relation with the series of cathode lines. The anode and cathodes are closely spaced and the panel contains an ionizable gas at relatively high pressure.
In order to use the display panel to display a bar of light, the anode and cathodes are connected in an operating circuit wherein each of the cathodes is energized or scanned and caused to glow sequentially. An analog signal to be displayed as a bar of light and a ramp signal are coupled to a comparator, the output of which energizes the anode electrode. When the two input signals are equal, the output of the comparator is zero, the anode is cut off, and the time in the scanning cycle when this occurs determines the number of cathodes which have been energized and the length of the bar of light displayed thereby. The scanning operation is carried out continually at such a rate that the bar of light appears to be stationary but is changeable in accordance with changes in the input analog signal.
REFERENCES:
patent: Re26207 (1967-05-01), Sylvander
patent: 3328790 (1967-06-01), Rhodes
patent: 3835465 (1974-09-01), Tannas, Jr. et al.
Burroughs Corporation
Dahl Lawrence J.
Green Robert A.
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