Patent ID: 8427417

Claim:
A driver circuit comprising plural stages of pulse output circuits, each of the pulse output circuits comprising: a first circuit for outputting an output signal in accordance with a potential of a first node and a potential of a second node; a second circuit for supplying a signal corresponding to an output signal from a pulse output circuit in a preceding stage to the first node; a third circuit for intermittently supplying a signal having a high power supply potential to the second node; a first transistor for controlling the potential of the first node in accordance with the potential of the second node; and a second transistor for controlling the potential of the second node, wherein the second node is electrically connected to a gate of the first transistor, wherein the signal corresponding to the output signal from the pulse output circuit in the preceding stage is supplied to a gate of the second transistor, wherein a fourth circuit for raising potentials of source terminals of the first and second transistors from a low power supply potential is provided between the source terminals of the first and second transistors and a wiring for supplying the low power supply potential, wherein a switch for setting the potentials of the source terminals of the first and second transistors to a low power supply potential is provided, and wherein the switch is controlled by a judgment circuit for judging whether the first and second transistors are enhancement transistors or depletion transistors.