DRIVER CIRCUIT, DISPLAY DEVICE INCLUDING THE DRIVER CIRCUIT, AND ELECTRONIC DEVICE INCLUDING THE DISPLAY DEVICE

摘要

A driver circuit where malfunctions in the circuit can be suppressed even when a thin film transistor is changed into an enhancement transistor or a depletion transistor is provided. In a pulse output circuit, a circuit for raising potentials of source terminals of first and second transistors from low power supply potentials is provided between the source terminals of the first and second transistors and a wiring for supplying a low power supply potential. Further, a switch for setting the potentials of the source terminals of the first and second transistors to low power supply potentials is provided. The switch is controlled by a judgment circuit for judging whether the first and second transistors are enhancement transistors or depletion transistors.