Abstract: An array substrate for a display device, including a substrate having a pixel region and a switching region, a source electrode and a drain electrode on the switching region of the substrate, ends of the source and drain electrodes having tapered edges, a pixel electrode in the pixel region of the substrate, the pixel electrode being connected to the drain electrode, an organic semiconductor layer on the source and drain electrodes, the organic semiconductor layer completely contacting tapered edges and a top surface of each of the source and drain electrodes, a first insulating layer on the organic semiconductor layer, and a gate electrode on the first insulating layer.