Patent ID: 6816153
Filing Date: 2004-11-09
Classification: G06F

Abstract:
A touch-panel device comprising:a touch-panel including a substrate and a conductive membrane provided on the substrate; an AC current generation section for supplying AC currents to the conductive membrane through a first point and a second point which are at outer peripheral sections of the conductive membrane; and current measurement sections for measuring a first current supplied through the first point and a second current supplied through the second point; wherein the touch panel has an impedance which is connected by interposing a switch between one end of the AC current generation section and a connection point, and wherein a touch position on the touch-panel is calculated based upon a current measurement value measured by the current measurement sections when the position measurement is not carried out and when the switch is turned ON and another current measurement value measured by the current measurement sections when the switch is turned OFF.