Patent ID: 8779798

Claim:
A semiconductor device comprising: a first line to which a first power supply potential is applied; a first transistor that includes a first semiconductor layer including a first channel, the first channel including an oxide semiconductor, wherein a first terminal of the first transistor is electrically connected to the first line; a second transistor that includes a second semiconductor layer including a second channel, the second channel including an oxide semiconductor, wherein a first terminal of the second transistor is electrically connected to a second terminal of the first transistor; a circuit electrically connected to a second terminal of the second transistor; and a second line to which a second power supply potential is applied, the second line electrically connected to the circuit, wherein the circuit is configured to control whether the second terminal of the second transistor and the second line are brought into conduction or not, and wherein each of the first channel and the second channel comprises c-axis aligned crystals of the oxide semiconductor.