Optical sensing unit, touch panel, method for manufacturing optical sensing unit, method for manufacturing touch panel, and display device

A method for manufacturing an optical sensing unit for an organic light-emitting diode (OLED) touch panel, the optical sensing unit comprising a Photo thin film transistor (TFT), a storage capacitor for storing a leakage current generated by the Photo TFT, and a Readout TFT for reading out an electric signal stored in the storage capacitor, the method comprising steps of:

• providing a substrate;
• forming a gate electrode of the Readout TFT capable of shielding an active layer of the Readout TFT and preventing the active layer from being exposed to an ambient light beam;
• forming a source electrode and a drain electrode of the Photo TFT in an insulating layer;
• and
• forming an entirety of a gate electrode of the Photo TFT in a gate insulating layer;
• wherein the gate insulating layer is between the insulating layer and the substrate;
• wherein an active layer of the Photo TFT includes an upper major surface and a lower major surface, and a pair of side surfaces that connect the upper major surface to the lower major surface;
• a first part of the source electrode of the Photo TFT and a first part of the drain electrode of the Photo TFT overlap and directly contact the upper major surface of the active layer of the Photo TFT;
• and
• a second part of the source electrode of the Photo TFT and a second part of the drain electrode of the Photo TFT are located on the gate insulating layer.