the invention is to provided an integrated , optical touch panel type image display device free from crosstalk with displayed images . the image display device according to the invention comprises a plurality of pixels having display brightness modulation means controlled with display signals , a display unit in which the plurality of pixels are arrayed , and a plurality of optical detecting means provided within the display unit wherein each of the optical detecting means comprises an optical detection diode for converting incident lights into signal electric - carriers , signal electric - carrier resetting means for resetting the signal electric - carriers , and output impedance modulating means for detecting the signal electric - carriers and modulating output impedances . the output impedance modulating means in the optical detecting elements are connected , in series between each other , to a y output line and an x output line .