| abstract |
The present invention is to suppress deterioration of a transistor. And has a first period and a second period. In the first period, the first transistor and the second transistor alternately turn on and off, and the third transistor and the fourth transistor are turned off. In the second period, the first transistor and the second transistor are turned off, and the third transistor and the fourth transistor alternately turn on and off. In this way, since the time for turning on the transistor can be shortened, deterioration of the characteristics of the transistor is suppressed. |