The potential, which is relative to the COM potential, of the third electrode 123 to which the driving signal S3 is applied through the third transistor 133 is also controlled using the control signal C3 and the driving signal S3, as with the case of the second electrode 122 described above. The phase of the driving signal S3 is shifted from the driving signal S2 by ? period as illustrated in FIG. 7, and hence, in one period of the driving signal S3 from the time t9 to the time t21, the potential of the third electrode 123 relative to the COM potential is a positive polarity of +5 V in seven vertical durations from the time t9 to the time t16, and is a negative polarity of ?5 V in five vertical durations from the time t16 to the time t21 as illustrated in FIG. 8. In other words, an AC signal that varies between the positive polarity potential (+5 V) and the negative polarity potential (?5 V), taking a potential of the COM signal as a reference, is applied to the third electrode 123 at the second period that is longer than the first period of the COM signal, in a state where the phase is shifted by ? period from the AC signal applied to the second electrode 122.
