| 摘要 |
PROBLEM TO BE SOLVED: To suppress deterioration of transistors.SOLUTION: An embodiment of the invention includes a first period and a second period. In the first period, a first transistor and a second transistor are alternately and repeatedly turned on and off, and a third transistor and a 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 are alternately and repeatedly turned on and off. Thus, since the period during which the transistors are turned on can be shortened, characteristics degradation of the transistors is suppressed.SELECTED DRAWING: Figure 1 |
