An array substrate of liquid crystal display device comprises a plurality of gate lines, and a plurality of data lines formed on the array substrate such that the gate lines and the data lines intersect each other to define a plurality of pixel regions, a plurality of thin film transistors formed at respective intersections of the gate lines and the data lines, a liquid crystal layer interposed between the array and color filter substrates, and a plurality of repair patterns formed on the first substrate. Each of the plurality of the repair patterns crosses a corresponding one of the data lines, and is along and adjacent to a corresponding one of the gate lines, such that the repair pattern includes protruding ends that protrude from the corresponding data line to repair a defect on the pixel regions.