D.C. Input shift panel driver circuits-biased inputs

Details D.C. Input shift panel driver circuits-biased inputs D.C. Input shift panel driver circuits-biased inputs

1980-12-22

1983-01-04

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

3151692, 3151694, G09G 328

Patent

active

043674682

ABSTRACT:
An electronic circuit for energizing a plasma charge transfer type display system, utilizing a display panel having input driver circuits for selectively creating trapped charge in designated lines of the display panel and phase driver circuits for sequentially shifting that charge into prescribed display panel locations. A synchronized switching voltage supply provides abruptly alternating negative and positive voltage levels to the group of input driver circuits. The separate group of phase driver circuits is supplied with a fixed level of positive polarity voltage. Selective synchronization of the input and the phase driver circuit output voltages by way of the control logic creates large transitions of relative voltage between designated input and phase electrodes within the display panel. The large but transient voltage between the selected electrodes causes the gas within the associated display panel cells to ionize and form trapped charge adjacent the selected line phase electrodes. Thereafter, the charge is moved in conventional manner by successive pulses to the phase electrodes. In the alternative, if the synchronized command signals to the phase driver circuits result in a zero voltage level at the phase electrodes during that period, the large transitions of relative voltage are absent and no charge is trapped for subsequent transfer into the display panel. The use of a dual polarity voltage source and conductive paths in the input driver circuits lowers the nominal operating voltages of the driver circuit electronic elements. Consequently, hybrid or monolithic devices can be utilized in locations heretofore restricted to discrete high voltage electronic components.

REFERENCES:
patent: 3781600 (1973-12-01), Coleman et al.
patent: 3976993 (1976-08-01), Hirose et al.
patent: 4051409 (1977-09-01), Craycraft

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