Compensation method for touch sensor system
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United States of America Patent
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May 1, 2012
Grant Date -
Sep 30, 2010
app pub date -
Dec 31, 2009
filing date -
Mar 25, 2009
priority date (Note) -
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Abstract
A compensation method devoid of operating voltage calibration, establishing fundamental linearity calibration table and inputting, and detecting the actual operating voltage is disclosed. The compensation method comprises the steps of: a) turning off a switch in a touch sensor system; b) initializing the touch sensor system and measuring a reference frequency outputted from a oscillator in the touch sensor system; c) turning on the switch and measuring a first frequency outputted from the oscillator; and d) deducting the first frequency from the reference frequency so as to obtain a frequency difference; and e) comparing the difference with a predetermined value, and judging based upon the difference if the touch sensor system is touched by a foreign object.
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