Patent ID: 8487903

Claim:
A display device comprising: a display panel having a first substrate and a second substrate, the second substrate having a conductive light shielding film formed in a grid pattern; a pulse-voltage-for-position-detection generating circuit that inputs a pulse voltage for position detection; and a coordinate position computing circuit that computes a touch position on the conductive light shielding film, wherein the conductive light shielding film is used as a touch panel electrode of electrostatic capacitive coupling system, the conductive light shielding film has a shape with four corners, the pulse-voltage-for-position-detection generating circuit supplies the pulse voltage for position detection to each of the four corners of the conductive light shielding film at different timings, and the coordinate position computing circuit computes a touch position on the conductive light shielding film based on a voltage output from, when the pulse voltage for position detection is supplied to one of the four corners of the conductive light shielding film, another corner on the same diagonal line as the corner to which the pulse voltage is supplied.