Capacitive touch sensing device by detecting induced electric field
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United States of America Patent
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Jul 8, 2014
Grant Date -
Apr 19, 2012
app pub date -
Oct 18, 2011
filing date -
Oct 19, 2010
priority date (Note) -
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Abstract
A capacitive touch sensing device by detecting induced electric field includes a differential amplifier, a resistor and a signal judgment circuit. The differential amplifier is electrically connected to a touch sensor. The resistor is electrically connected to a first input end and a second input end of the differential amplifier. The signal judgment circuit is electrically connected to an output end of the differential amplifier. As the touch sensor receives an induced electric field signal, the induced electric field signal is amplified by the differential amplifier and the signal judgment circuit determines whether the amplified induced electric field signal is a touch input.
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