Patent ID: 8866797

Claim:
A display device with a position detecting function, the display device comprising: an optical position detecting device which includes a position detecting light source including a first light source configured to emit a first position detecting infrared light having a light amount Ea attenuated along a first direction and having an attenuation coefficient fa, and a second light source configured to emit a second position detecting infrared light having a light amount Eb attenuated along a second direction opposite to the first direction and having an attenuation coefficient fb, and a light receiving element configured to receive the first position detecting infrared light and the second position detecting infrared light reflected by a target object inside a detection region, detect a light amount Ga of the first position detecting infrared light reflected by the target object and a light amount Gb of the second position detecting infrared light reflected by the target object, and detect a position of the target object on the basis of the light amount Ga, the light amount Gb, the light amount Ea, the light amount Eb, the attenuation coefficient fa, and the attenuation coefficients fb, and an image creating device which includes an image display region of an electric optical panel in a region overlapped with the detection region, the electric optical panel including a first substrate including a plurality of scanning lines and a plurality of data lines, and a second substrate opposite to the first substrate, wherein the light receiving element is constituted by a semiconductor element formed on the first substrate of the electric optical panel.