Patent ID: 8564568

Claim:
A touch panel comprising: an infrared sensor comprising: an absorbing layer including a material which selectively absorbs light having a wavelength in an infrared range; a PN junction layer disposed on the absorbing layer, wherein the PN junction layer comprises a P-type organic material layer and an N-type organic material layer; and a transparent electrode comprising at least one of a first electrode layer disposed on the P-type organic material layer, and a second electrode layer disposed under the N-type organic material layer and having a work function which is smaller than a work function of the first electrode layer; and at least one of a first buffer layer disposed between the first electrode layer and the P-type organic material layer; and a second buffer layer disposed between the N-type organic material layer and the second electrode layer; and an infrared source which supplies infrared radiation to the infrared sensor, wherein one of the P-type organic material layer and the N-type organic material layer is disposed between the absorbing layer and the other of the P-type organic material layer and the N-type organic material layer.