Abstract: An array substrate for in-plane switching liquid crystal display device includes a gate line on a substrate, a data line crossing the gate line to define a pixel region, a semiconductor layer including an active area and a source area, wherein the active area overlaps the gate line and the source area overlaps the data line, a drain electrode connected to the semiconductor layer, a first capacitor electrode in the pixel region and connected to the drain electrode, a pixel electrode connected to the first capacitor electrode and substantially in parallel to the data line, a common line substantially parallel to the gate line, a second capacitor electrode connected to the common line and overlapping the first capacitor electrode, and a common electrode connected to the common line and alternatively arranged with the pixel electrode, wherein the source area of the semiconductor layer, the drain electrode, the first capacitor electrode and the pixel electrode include doped polycrystalline silicon.