Patent ID: 8854084

Claim:
A method for driving a semiconductor device, the method comprising the steps of: setting a potential of a second terminal of a first transistor and a potential of a gate of the first transistor to a first potential in a first period, wherein the first potential is smaller than a potential of a first power source by an amount more than a threshold voltage of the first transistor, a first terminal of the first transistor is electrically connected to the first power source, and the gate of the first transistor is electrically connected to the second terminal of the first transistor through a first capacitor and a first switch which are electrically connected in parallel between the gate of the first transistor and the second terminal of the first transistor; increasing the potential of the second terminal of the first transistor and the potential of the gate of the first transistor in a second period which is sequential to the first period so that a voltage between the second terminal of the first transistor and the gate of the first transistor becomes the threshold voltage of the first transistor; and decreasing the potential of the second terminal of the first transistor by a second potential in a third period which is sequential to the second period so that the potential of the gate of the first transistor is decreased by the second potential.