Patent ID: 8587538

Claim:
A method for driving a touch panel, the touch panel including an X-side resistive film and a Y-side resistive film, the films facing each other with a predetermined gap therebetween, the method comprising: obtaining a saved representative resistance value corresponding to the X-side resistive film and the Y-side resistive film; calculating an X-side on-period corresponding to a connection to the X-side resistive film to establish an amount of current flow to the X-side resistive film during the X-side on-period, based on the corresponding saved representative resistance value; calculating a Y-side on-period corresponding to a connection to the Y-side resistive film to establish an amount of current flow to the Y-side resistive film during the Y-side on-period, based on the corresponding saved representative resistance value; alternately switching between a connection to the X-side resistive film and a connection to the Y-side resistive film using a switch, to detect X and Y coordinates of a contact position of the X-side resistive film and the Y-side resistive film, the alternate switching occurring based on the X-side on-period and the Y-side on-period, respectively, wherein the on-periods are calculated so as to minimize a sum of the X-side current flow and Y-side current flow, and wherein the X-side on-period is different than the Y-side on-period; wherein the saved representative resistance values were previously saved based on measured resistance values of X-side resistive films and measured resistance values of Y-side resistive films, for a plurality of touch panels, the plurality of measured resistance values being averaged and saved as the corresponding representative resistance values, respectively; wherein the amount of the X-side current flow and the amount of the Y-side current flow are set to be different from each another by setting different values for the X-side on-period and the Y-side on-period, respectively; and wherein the current flow time of a first side corresponding to the smaller resistance value is set to a smaller current flow time than the current flow time of a second side having the larger resistance value.