Method and apparatus for open drain addressing of a gas discharg

Details Method and apparatus for open drain addressing of a gas discharg Method and apparatus for open drain addressing of a gas discharg

1977-04-27

1979-02-20

Smith, Alfred E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340805, 3151694, H05B 3700, H05B 3900, H05B 4100

Patent

active

041409442

ABSTRACT:
A method and apparatus for operating a gas discharge display/memory panel having a pair of opposed electrode arrays. A pulsating potential sustainer wave form is applied to one electrode array while the other electrode array is maintained at the reference potential of the sustainer wave form, typically the system ground potential. The potentials are applied to the electrodes through switching circuits individual to the electrodes, each circuit including a normally turned on MOSFET and a feed through diode. The MOSFET and the diode are oppositely poled and connected in parallel between the potential sources and the associated electrode. When a cell is addressed, either written or erased, the MOSFETs in the switching circuits connected to the one electrode array are turned off except for the MOSFET connected to the electrode of the selected cell and the MOSFET in the switching circuit for the other electrode array connected to the electrode of the selected cell is turned off while an address pulser for each electrode array is turned on to apply partial select address voltage pulses to the selected cell. During this addressing, the electrodes of the one electrode array are clamped at a predetermined potential and the selected electrode of the other array can have a keyer pulse voltage applied thereto to improve the addressing of the cell.

REFERENCES:
patent: 3908151 (1975-09-01), Schermerhorn
patent: 3993990 (1976-11-01), Miller et al.
patent: 4027196 (1977-05-01), Criscimagna et al.
patent: 4063131 (1977-12-01), Miller

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