Abstract: An array substrate for a display device includes: a substrate; a gate electrode on the substrate; a gate insulating layer on the gate electrode, the gate insulating layer having an organic-inorganic hybrid material; a semiconductor layer on the gate insulating layer over the gate electrode; source and drain electrodes spaced apart from each other on the semiconductor layer; a passivation layer on the source and drain electrodes, the passivation layer having a drain contact hole exposing the drain electrode; and a pixel electrode on the passivation layer, the pixel electrode connected to the drain electrode through the drain contact hole.