A liquid crystal display device includes a liquid crystal panel including a plurality of gate lines (GL1 to GLn) data lines (DL1 to DLm) and a plurality of pixel areas; a timing controller arranging the external input image data to be proper to the driving of the liquid crystal panel, generating a gate control signal (GCS) and a data control signal (DCS), and grouping the arranged image data into a plurality of groups each having a plurality of controller channels, and outputting a group control signal (HINV_m) by determining whether the arranged image data for each group is proper to horzintal-1-dot inversion or horizontal-2-dot inversion; a gate driver driving the plurality of the gate lines of the liquid crystal panel based on the gate control signal (GCS) from the timing controller; and a data driver grouping output terminals into a plurality of groups.