As illustrated in FIG. 7, the COM signal is at the second potential (0 V) from the time t7 to the time t8, and the control signal C1 is OFF, and hence, the potential of the first electrode 121 relative to the COM potential is equal to the potential from the time t6 to the time t7 when charging is performed in the liquid crystal capacitor. Thus, the potential of the first electrode 121 is +5 V as illustrated in FIG. 8. As illustrated in FIG. 7, from the time t8 to the time t9, the COM signal is at the first potential (5 V), the control signal C1 is ON, and the driving signal S1 is at the fourth potential (0 V). Thus, the potential of the first electrode 121 relative to the COM potential is ?5 V as illustrated in FIG. 8. As illustrated in FIG. 7, the control signal C1 repeats OFF and ON from the time t9 to the time t13 such that the control signal C1 is OFF in a vertical duration when the COM signal is at the second potential (0 V), and the control signal C1 is ON in a vertical duration when the COM signal is at the first potential (5 V). Thus, the fourth potential (0 V) of the driving signal S1 applied when the control signal C1 is ON is charged in the liquid crystal capacitor, and the potential of the first electrode 121 relative to the COM potential during this duration is maintained when the control signal C1 is OFF. For this reason, the potential of the first electrode 121 relative to the COM potential is ?5 V as illustrated in FIG. 8.
