Position detection device

摘要

A touch position detection device includes (i) infrared light sensors and visible light sensors which are sensitive to light of respective different wavelengths, and (ii) an external light intensity calculation section which calculates an estimated value serving as an index of external light intensity, which is intensity of light in the surroundings of a target subject. As such, the touch position detection device is capable of appropriately detecting a position of a figure of the target subject under a broad range of ambient light intensities.