Method of detecting presence of interference source, and touch sensing system
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United States of America Patent
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Oct 13, 2015
Grant Date -
Oct 16, 2014
app pub date -
Sep 30, 2013
filing date -
Apr 16, 2013
priority date (Note) -
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Abstract
A method for detecting presence of an interference source is to be performed by a touch sensing system that stores a threshold capacitance difference. The method includes the steps of sampling capacitances periodically within a time period for obtaining a base capacitance value; sensing a comparison capacitance after the time period; computing an absolute difference between the comparison capacitance and the base capacitance value; and determining that the interference source is present when the comparison capacitance is smaller than the base capacitance value and the absolute difference is greater than the threshold capacitance difference.
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