Patent ID: 8194046

Claim:
A method for measuring the position of a pointing object on a surface capacitance touch panel, said method comprising the steps of: 1) providing a touch panel comprised of an insulating substrate, a resistive material disposed on the substrate, and a dielectric disposed on the resistive material; 2) connecting a capacitor to opposite first and second edges of the touch panel and measuring current X 1 across the surface thereof; 3) switching connections of the capacitor between the first and second edges of the touch panel and measuring current X 2 across the surface thereof; 4) connecting the capacitor to opposite third and fourth edges of the touch panel and measuring current X 3 across the surface thereof; 5) switching connections of the capacitor between the third and fourth edges of the touch panel and measuring current X 4 across the surface thereof; and 6) triangulating a position of the pointing object using a current measurement circuit to obtain the current measurements X 1 , X 2 , X 3 and X 4 .