PURPOSE: To simultaneously change output of a scanning driver and a data driver, to reduce power consumption and to improve quality of display by setting signal delay of a scanning driver side and a data driver side equally basing on the clock pulse as a reference.

CONSTITUTION: An alternating signal M is inputted to a latch fetches circuit FF through an input buffer IB. This latch circuit FF the alternating signal M synchronizing with a clock pulse CL and transmits an alternating signal M' to a level shifter. And, both a scanning driver and a data driver are provided with an input buffer section, and fetch the same alternating signal M by the same clock pulse CL. Therefore, the alternating signal M' supplied to the level shifter in the scanning driver and the data driver is varied with same timing. Consequently, variation timing of driving voltage supplied to a scanning line electrode and a signal line electrode are made almost the same, and high voltage due to output time difference is not applied to liquid crystal.