Additionally, because the common electrode does not oppose the at least three electrodes with the liquid crystal layer interposed between the electrodes, the ionic impurity sweeping effect of the at least three electrodes configured for ion trapping is less likely to be affected by the potential of the common signal supplied to the common electrode. In other words ionic impurities can be smoothly swept from the display region to the outside.
In the above-described liquid crystal device, the switching element is in a coupled state in all or part of a first duration in which the common signal is at the first potential and the AC signals are at a negative-polarity potential, or a second period in which the common signal is at the second potential and the AC signals are at a positive-polarity potential, the switching element being in an uncoupled state in a duration other than the first duration, when the common signal is in the first duration and the switching element is in a coupled state, the driving signal is at the fourth potential, and when the common signal is in the second duration and the switching element is in the coupled state, the driving signal is at the third potential.
According to this configuration, the potential supplied to the electrodes configured for ion trapping can be controlled by the driving signal in units of durations equal to ? the first period. In other words, taking the potential of the common signal as a reference, the duration in which the potential of the AC signal applied to the electrodes has a positive polarity, the duration in which the potential has a negative polarity, and the like can be controlled.