Power source circuit apparatus for electro-luminescence device
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United States of America Patent
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Jan 1, 1991
Grant Date -
N/A
app pub date -
Dec 4, 1989
filing date -
Dec 9, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A low DC voltage supplied to a low DC voltage receiving terminal is converted into a high DC voltage by a DC-DC step-up circuit. The obtained high DC voltage has an optimal value for driving an electro-luminescence device. This high DC volatage is converted into an AC voltage through a pair of series-connected transistors in a switching circuit ON/OFF-controlled in response to an oscillation output from a multivibrator. The converted voltage is supplied to the electro-luminescence device through a series resonance circuit including the electro-luminescence device and a reactor as an AC drive voltage. At this time, a resonance voltage is fed back to the multivibrator and the switching circuit so as to obtain an appropriate luminance correction capability.
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