Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1979-08-23
1981-02-10
Trafton, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
3151691, 340813, G08B 536
Patent
active
042505046
ABSTRACT:
A gas discharge display circuit for driving a plurality of gas discharge tubes in a time-multiplexed manner is disclosed. Each of the tubes include an anode, a plurality of display cathodes and a control cathode. A tube selection circuit generates a plurality of tube drive pulses which are sequentially applied to the anodes of each of the gas discharge tubes. A display cathode selection circuit, including a plurality of low-breakdown-voltage saturated switches, is coupled in parallel to each display tube and determines which display elements of each display tube are to be lighted in response to the application of the tube drive pulse. After a given display tube has been fired, a current control regulation circuit adjusts the anode voltage to the particular level required to induce a predetermined current in the lighted display cathodes. The current control regulation circuit utilizes the current in the control cathode of the fired display tube to regulate the anode voltage of the fired tube and thereby ensure a predetermined current in each of the display cathodes.
REFERENCES:
patent: 3594758 (1971-07-01), Gluck
patent: 3794881 (1974-02-01), Janssen
patent: 3821598 (1974-06-01), Holz
patent: 4109180 (1978-08-01), Ogle et al.
Davis James C.
General Electric Company
Krauss Geoffrey H.
Snyder Marvin
Trafton David L.
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