Patent ID: 8373671

Claim:
A touch screen device comprising: a plurality of first electrodes extending in parallel to each other; a plurality of second electrodes extending in parallel to each other, the first electrodes and the second electrodes being arranged in a grid pattern; a transmitter that applies a drive signal to each of the first electrodes; a receiver that receives a charge-discharge current signal from each of the second electrodes in response to the drive signal applied to each of the first electrodes, and outputs a level signal at each intersection between the first electrodes and the second electrodes; and a controller that detects a touch position based on the level signal output from the receiver, wherein the receiver includes an IV converter that converts the charge-discharge current signal into a voltage signal, and wherein a conversion characteristic of the IV converter is set such that phases of amplitude of the voltage signal corresponding to a leading edge and a trailing edge of a pulse wave of the drive signal substantially match each other, and phases of amplitude of the voltage signal corresponding to the trailing edge of the pulse wave and a leading edge of a succeeding pulse wave substantially match each other.