An array substrate for an in-plane switching mode liquid crystal display devices includes: a substrate; a gate line and a data line on the substrate, the gate line crossing the data line to define a pixel region; a common line parallel to the gate line; a thin film transistor connected to the gate line and the data line; a plurality of common electrodes extending from the common line, and a plurality of pixel electrodes alternating with the plurality of common electrodes, wherein a gap distance is defined as a width of a block by the adjacent common and pixel electrode in the pixel region, and at least one gap distance is different from the other gap distances.