An array substrate for a liquid crystal display device includes a gate line on a substrate; a gate insulating layer on the gate line; a data line crossing the gate line; a gate electrode connected to the gate line; an active layer on the gate insulating layer and overlapping the gate electrode; first and second ohmic contact layers on the active layer, the first and second ohmic contact layers spaced apart from each other by a first distance; first and second barrier patterns spaced apart from each other by the first distance and on the first and second ohmic contact layers, respectively. The active layer is exposed through the first and second barrier patterns; source and drain electrodes spaced apart from each other by a second distance greater than the first distance and on the first and second barrier patterns, respectively.