Array substrate, display device and fabrication method

An array substrate, comprising a display area and a non-display area located at a periphery of the display area, wherein the array substrate comprises:

• a base substrate;
• a first metal layer located at one side of the base substrate, the first metal layer comprises a light shielding part, a source and a drain, the light shielding part, the source and the drain are located in the display area;
• a buffer layer located at a side, facing away from the base substrate, of the first metal layer;
• an active layer located at a side, facing away from the first metal layer, of the buffer layer and located in the display area;
• a gate insulating layer located at a side, facing away from the buffer layer, of the active layer;
• and
• a second metal layer located at a side, facing away from the active layer, of the gate insulating layer, wherein the second metal layer comprises a gate, a source landing electrode and a drain landing electrode, the gate, the source landing electrode and the drain landing electrode are located in the display area, the source landing electrode is in contact with the active layer and the source through a first via hole penetrating through the gate insulating layer and the buffer layer and exposing one end of the active layer, and the drain landing electrode is in contact with the active layer and the drain through a second via hole penetrating through the gate insulating layer and the buffer layer and exposing the other end of the active layer.