Patent ID: 8170822

Claim:
A compensation method, comprising steps of: (a) providing a touch sensor system having an oscillator and a switch for connecting an input pad outside the touch sensor system; (b) closing the switch by a control means so as to measure a first frequency outputted from the oscillator; (c) opening the switch by the control means and coupling a plurality of impedance elements by order at an output side of the oscillator so as to let a reference frequency outputted by the oscillator closest to the first frequency; (d) closing the switch so as to measure a second frequency outputted from the oscillator; (e) subtracting the reference frequency from the second frequency by a subtracting means so as to obtain a frequency difference; and then (f) comparing the frequency difference with a specific value so as to judge if the touch sensor system being touched by an external object, after a while, go back to (d).