Drive circuit for electroluminescent panels and the like
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United States of America Patent
Stats
-
Sep 6, 1994
Issued Date -
N/A
app pub date -
Dec 11, 1992
filing date -
Oct 11, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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