Patent ID: 9104286
Filing Date: 2015-08-11
Classification: G06F

Abstract:
1. A control circuit configured to control 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 circuit comprising: a voltage generating unit configured to apply a predetermined first bias voltage and a predetermined second bias voltage to the first and second terminals, respectively; a voltage detection unit configured to detect a panel voltage that occurs at the third terminal; a current detection unit configured to detect a panel current that flows through a path including the first terminal, the first resistive film, and the second terminal; and a coordinate determination unit configured to determine the coordinates touched by the user, based upon the panel voltage and the panel current thus detected, and wherein the voltage generating unit comprises a regulator which includes an output transistor provided as an extension to a path on the first terminal side that includes the first terminal, the first resistive film, and the second terminal, and which is configured to apply the first bias voltage to the first terminal, and wherein the current detection unit comprises and wherein the current detection unit is configured to output a value that corresponds to a voltage drop that occurs at the detection resistor as a value which represents the panel current.