Similar to Example 3 described above, the driving signal S1 stays at the fourth potential (0 V) between time t0 and time t1, varies at the time t1 from the fourth potential (0 V) to the third potential (5 V), and is maintained at the third potential (5 V) between time t1 and time t8. In addition, the driving signal S1 varies at time t8 from the third potential (5 V) to the fourth potential (0 V), and is maintained at the fourth potential (0 V) between time t8 and time t13. The driving signal S1 varies at time t13 from the fourth potential (0 V) to the third potential (5 V), and is maintained at the third potential (5 V) between time t13 and time t18. Furthermore, the driving signal S1 varies at time t18 from the third potential (5 V) to the fourth potential (0 V), and is maintained at the fourth potential (0 V) between time t18 and time t25. That is, the period of the driving signal S1 is six times the first period of the COM signal, and the duration in which the third potential (5 V) is maintained and the duration in which the fourth potential (0 V) is maintained have the same length in a duration being double of the period of the driving signal S1. In this case, the duration in which the third potential (5 V) is maintained and the duration in which the fourth potential (0 V) is maintained are each equal to 12 vertical durations of the COM signal. Note that, in Example 4, as the period of the driving signal S1, an integer (multiple (n times) of six of first period of the COM signal suffices.