Row driver for EL panels and the like with inductance coupling

Details Row driver for EL panels and the like with inductance coupling Row driver for EL panels and the like with inductance coupling

1988-12-09

1990-09-18

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

3151691, 340781, G09G 330

Patent

active

049581058

ABSTRACT:
A simplified row driver switching circuit for display panels and the like, including particularly electroluminescent (EL) panels, as well as plasma panels, using inductance coupling between the power supply and the row electrodes. The circuit limits energy transfer to each row electrode of the EL panel through the inductance coupling, minimizing the effects of destructive arcing caused by inter-electrode shorts. The circuit is energy conservative and eliminates the need for, for example, -160 V and +220 V power supplies. Two row driver circuits are disclosed (FIGS. 4 & 6), the latter allowing the row electrodes to be driven to negative, as well as positive, voltages. Inductor(s) (L of FIG. 4; L.sub.1 & L.sub.2 of FIG. 6) are used to store and transfer energy to the row electrode load (C.sub.panel) and then back to the power source (V.sub.in), as various switches are pulsed "on" and released. The same power supply can be used for both the row driver and the column driver (FIG. 7).

REFERENCES:
patent: 4070663 (1978-01-01), Kanatani et al.
patent: 4527096 (1985-07-01), Kindlmann
patent: 4570159 (1986-02-01), Criscimagna et al.
patent: 4707692 (1987-11-01), Higgins et al.
patent: 4866349 (1989-09-01), Weber et al.

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