Drive circuit for electroluminescent panels and the like

Details Drive circuit for electroluminescent panels and the like Drive circuit for electroluminescent panels and the like

1992-12-11

1994-09-06

Pascal, Robert J.

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

315219, 315291, 315307, G09G 310

Patent

active

053451465

ABSTRACT:
A drive circuit for an electroluminescent panel applies an AC voltage cycle at typical power cycle frequencies by increasing the voltage profile in discrete, pulsed steps at a rate which is at least one order of magnitude greater than the AC frequencies applied to power the panel. A transformer through which the power pulses are applied to the panel is of smaller size than state of the art resonant transformers for applying power cycles to electroluminescent panels. The reduced size of the transformer is advantageous in packaging the drive circuit in portable devices using electroluminescent panels. The voltage steps at the leading edge of the voltage excursions of the AC cycle applied to the panel may be programmably changed to adjust the light output of the panel, or to adjust the power applied by the circuit to correspond to the size of the panel to which the power is applied.

REFERENCES:
patent: 4527096 (1985-07-01), Kindlmann
patent: 4952848 (1990-08-01), Erhardt
patent: 4982141 (1991-01-01), Pace et al.
patent: 5027040 (1991-06-01), Ikeda et al.
patent: 5066895 (1991-11-01), Alessio
patent: 5144203 (1992-09-01), Fujita et al.

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