A liquid crystal display device and a video processing method of the same are disclosed. A video processing method of a liquid crystal display device includes a first step determining whether a current frame is a motion picture by comparing data of a current frame with data of a previous frame; a second step converting and outputting a number of bits of a white gradation data of the current frame and outputting data of the other gradations without the bit conversion, if it is determined in the first step that the current frame is the motion picture; a third step outputting the data of the current frame without the bit-conversion if it is determined in the first step that the current frame is a still image; and a fourth step comparing the data of the current frame outputted in the second or third step with data of a previous frame and outputting overdriving control (ODC) data converted based on the result of the comparison.