Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1973-06-21
1986-05-27
Trafton, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
3151694, 340778, 340805, G09F 900
Patent
active
045918473
ABSTRACT:
Low cost apparatus for a gas display panel is operated by a method to provide reliable write, sustain, and erase operations. For sustain operations a first square wave train is applied to all horizontal lines of the gas display panel simultaneously as a second square wave train, displaced 90.degree. from the first square wave train is applied to all vertical lines. For a write operation the frequency of the first and second square wave trains is reduced, and a pulse is superimposed or algebraically added to the sustain signals which results in a composite signal. The superimposed signal (a) increases the potential on a selected horizontal line, (b) decreases the potential on the remaining horizontal lines, (c) decreases the potential on a selected vertical line, and (d) inceases the potential on the remaining vertical lines. The selected cell receives an increased potential difference sufficient to equal or exceed the ignition potential after all of the remaining cells receive a sustain potential which ignites all cells which were previously ignited. The algebraically added pulses cancel out the effect of each other across the half selected cells and the non selected cells. For an erase operation a given signal of constant magnitude and polarity is applied to all horizontal lines and all vertical lines, and a pulse is algebraically added on the given signal which (a) increases the potential on a selected horizontal line, (b) decreases the potential on the non selected horizontal lines, (c) decreases the potential on a selected vertical line, and (d) increases the potential on the non selected vertical lines whereby no gas cell in the gas panel receives a potential difference sufficient to equal or exceed the sustain level. However, the selected gas cell, and only this gas cell, receives a potential difference having a polarity opposite to that of the last sustain signal and an amplitude that is just barely sufficient to fire the cell, and this is effective in reducing the charge sometimes referred to as the wall charge, across the selected gas cell substantially to zero. After a suitable time delay, referred to as dead time, the wall charge across the selected gas cell is reduced to zero, and the selected gas cell thus is returned to the extinguished state. A sustain operation then takes place which reignites all gas cells previously ignited before the erase operation except the selected erased cell. The algebraically added pulses cancel out the effect of each other across the half selected cells and the non selected cells.
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Criscimagna Tony N.
Piston Albert O.
Connerton Joseph J.
International Business Machines - Corporation
Trafton David L.
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