Patent ID: 8669924

Claim:
A display, comprising: a substrate; and a plurality of pixels formed on the substrate and arranged in an array, each pixel comprising: (a) a driving transistor and a read-out transistor spatially formed on the substrate, each transistor having a gate electrode, a drain electrode and a source electrode; (b) an organic light emitting diode (OLED) having a cathode layer, an anode layer and an emissive layer formed between the cathode layer and the anode layer, and formed over the driving transistor and the read-out transistor such that the anode layer of the OLED is electrically connected to the source electrode of the driving transistor, and the OLED has a light emitting area defined between the driving transistor and the read-out transistor; and (c) a photo sensor having a photosensitive layer formed between the anode layer of the OLED and the source electrode of the read-out transistor for receiving light emitted from the OLED, wherein the photosensitive layer is in direct contact with the anode layer of the OLED and defines a photo sensing area located in the light emitting area.