An array substrate for a liquid crystal display device comprises: gate and data lines crossing each other on a substrate to define a pixel region; a common line spaced apart from and parallel with the gate line; a thin film transistor in the pixel region and connected to the gate and data lines; a passivation layer on the thin film transistor; and pixel and common electrodes alternately arranged to produce an in-plane electric field, wherein each of the pixel and common electrodes has a double-layered structure of which the lower layer is formed of reflective conductive material and the upper layer is formed of transparent conductive material.