AC driver having three power supply voltages including an internally generated voltage
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United States of America Patent
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-
Sep 12, 2000
Issued Date -
N/A
app pub date -
Oct 20, 1995
filing date -
Feb 23, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to an improvement in an EL driver including a second power supply voltage producer for producing second supply voltage for use in driving an EL lamp using a battery serving as a first power source, a third supply voltage producer for producing third supply voltage that is higher than the first supply voltage and lower than the second supply voltage, and a driving signal supplier for supplying an AC driving signal to an EL driving means when driven by the third supply voltage. The level of the AC driving signal is increased in two steps. The EL driver semiconductor device characteristic of the high-voltage efficiency and high threshold voltage can therefore be driven by low voltage.
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