Array substrate for digital X-ray detector, and digital X-ray detector including the same

A digital X-ray detector comprising:

• an array substrate comprising:
• a base substrate,
• a plurality of gate lines and a plurality of data lines disposed to cross each other over the base substrate, so as to define a plurality of pixel regions,
• a thin film transistor disposed in each of the pixel regions,
• a PIN diode including a lower electrode connected to the thin film transistor, a PIN layer disposed over the lower electrode, and an upper electrode disposed over the PIN layer,
• a protective layer disposed over the PIN diode, and
• a bias electrode connected to the upper electrode while being disposed over the protective layer, and disposed to cover a circumferential surface of the PIN diode;
• and
• a scintillator disposed over the array substrate.