| 摘要 |
PROBLEM TO BE SOLVED: To provide a new circuit that is used for a shift register and the like.SOLUTION: A basic configuration includes: a first transistor to fourth transistor; and first wiring to fourth wiring. A power supply potential VDD is supplied to the first wiring; and a power supply potential VSS is supplied to the second wiring. A digital signal having two values is supplied to the third wiring and fourth wiring. This digital signal is at the same potential as the power supply potential VDD when it is at a high level; and the signal is at the same potential as the power supply potential VSS when it is at a low level. There are four combinations of potentials of the third wiring and fourth wiring; and any of the combinations of potentials can turn off the first transistor to fourth transistor. That is, since there is no transistor that is always on, deterioration of transistor characteristics can be suppressed. |
