A liquid crystal display device includes a built-in one of them to the control for applying the data voltages to the corresponding data line to the data driver control signal wonchiphwa plurality of drive devices. A plurality of driving devices each having a second signal terminal and the first signal terminal. First signal terminal from the signal control unit which neighbors the first direction in the second period of outputting a control data for controlling the video display to the signal control unit which neighbors the first direction, wherein the first period after the first period It is used for receiving the mode signal detection for the determination of the final operating mode. Second signal terminal outputs the mode detection signal to the signal control unit which neighbors in the first period to the second direction different from the first direction, and the control from the signal control unit which neighbors on the second term in the second direction It is used to receive input data.