Patent ID: 8432375

Claim:
A method for determining the position of a pointing object on a first axis of a surface capacitance touch panel, said method comprising: 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 charged capacitor to opposite first and second edges of the resistive material and measuring current X1 through a path from the first edge to an electrostatic ground using a current measurement circuit; 3) switching connections of the charged capacitor between the first and second edges of the resistive material and measuring current X2 through a path from the second edge to the electrostatic ground using the current measurement circuit; and 4) determining a position of the pointing object on the first axis between the first and second edges on a surface of the resistive material as a ratio of measured currents X1 and X2.