Patent ID: 8144131

Claim:
A display device with a touch panel including a substrate that has a planar transparent conductive film formed on the surface thereof on an observer side, the transparent conductive film being used as a transparent electrode of an electrostatic capacitance coupling type touch panel, comprising: a position detection pulsating voltage production circuit that produces a pulsating voltage for position detection; and a coordinate position arithmetic circuit that computes a touched position on the transparent conductive film, wherein: the transparent conductive film is shaped to have four corners; the position detection pulsating voltage production circuit applies the pulsating voltage for position detection to each of the four corners of the transparent conductive film at different timings; and when the pulsating voltage for position detection is applied to one of the four corners of the transparent conductive film, the coordinate position arithmetic circuit computes the touched position on the transparent conductive film on the basis of a rise time of a voltage outputted through a corner diagonally opposite to the one of the four corners to which the pulsating voltage is applied.