The present invention provides a structure of a pixel, which has a simple structure and employs an arrangement where a terminal of the storage capacitor Cst is of the same potential as the gate line. In other words, under a condition of not reducing aperture ratio, an arrangement of two (or three) gate lines is used, of which one is used to early set the voltage of the pixel electrode to a reference voltage by one period of line scanning time and, also, which is set to partly overlap the pixel electrode of a structure of another pixel to provide a storage capacitor, so as to shorten the charging time of the pixel unit and increase the charging speed of the pixel unit.