US 2010/0250180 A1 · COMPENSATION METHOD FOR TOUCH SENSOR SYSTEM

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.

Claims6

Dependent claims

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).

4 more elements

Dependencies are inferred from the claim text.

Compensation method for touch sensor system

Life of this patent

Compensation method for touch sensor system

Life of this patent

Abstract

Claims6