Patent ID: 8860673

Claim:
A control method, for a touch panel comprising a first terminal, a second terminal, a third terminal, a first resistive film arranged such that one edge thereof is connected to the first terminal and an edge that is opposite to the aforementioned one edge is connected to the second terminal, and a second resistive film arranged with a gap between it and the first resistive film such that one edge thereof is connected to the third terminal, the control method comprising: applying a predetermined first bias voltage and a predetermined second bias voltage to the first and second terminals, respectively; detecting a panel voltage that occurs at the third terminal; detecting a panel current that flows through a path including the first terminal, the first resistive film, and the second terminal; and determining coordinates touched by a user, based upon the panel voltage and the panel current, wherein, when the user touches two points, the panel current has a value according to an interval between the two points, and there is a one-to-one correspondence between the panel current and the interval between the two points, and wherein the control method further comprises determining the interval between the two points based upon the value of the panel current by referring to the one-to-one correspondence when the user touches two points, wherein the judgment processing comprises: determining the midpoint between the two coordinates based upon the panel voltage; and determining the coordinates of one of the two points by adding a value that corresponds to the interval between the two coordinates to the midpoint coordinates, and determining the coordinates of the other of the two points by subtracting, from the midpoint coordinates, a value that corresponds to the interval between the two coordinates.