A thin film transistor array substrate for a digital X-ray detector device including a base substrate; a plurality of data lines and a plurality of gate lines disposed on the base substrate and arranged to cross each other; a driving thin film transistor disposed above the base substrate and including a first electrode, a second electrode, a gate electrode and an active layer; a PIN diode connected to the driving thin film transistor; and at least one shielding layers disposed above the driving thin film transistor and configured to overlay the active layer, wherein the at least one shielding layers are electrically connected to the plurality of data lines.