A liquid crystal display is described. The liquid crystal display includes a common voltage generation unit that swings first and second common voltages in opposite directions every a predetermined period of time using two voltage levels, a plurality of first longitudinal common lines that are formed parallel to data lines to supply the first common voltage input through first input units to first pixel common line patterns formed in first pixel units, and a plurality of second longitudinal common lines that are formed parallel to the data lines to supply the second common voltage input through second input units to second pixel common line patterns formed in second pixel units.