Capacitive touch panel device
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United States of America Patent
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Jan 8, 2013
Grant Date -
Nov 18, 2010
app pub date -
Apr 29, 2010
filing date -
May 14, 2009
priority date (Note) -
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Abstract
Disclosed is a capacitive touch panel device having a sensing control unit that performs a scan sequence on individual sensor electrodes to measure sensor output values. The sensing control unit exercises control to measure sensor output values, with setup performed to avoid the detection of sensitivity slope, by executing a first scan sequence on all sensor electrodes. If the result of the first scan sequence indicates that multiple points are touched, the sensing control unit exercises control to measure sensor output values again, with setup performed to allow the detection of sensitivity slope, by executing a second scan sequence on the sensor electrodes related to a plurality of touch position candidate coordinates derived from multiple point touches, and identify and eliminate erroneously detected coordinates in accordance with the sensor output values measured upon the execution of the second scan sequence and with the tendency of sensitivity slope.
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