Patent ID: 8605073

Claim:
A display device comprising: a plurality of gate signal lines; a plurality of source signal lines; a pixel provided in a region where the gate signal line and the source signal line intersect with each other; and a gate driver circuit directly electrically connected to the plurality of gate signal lines, wherein the gate driver circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, and an inverter circuit, wherein a first terminal of the first transistor is directly electrically connected to a first wiring, and a second terminal of the first transistor is directly electrically connected to a second wiring, wherein a first terminal of the second transistor is directly electrically connected to a third wiring, and a second terminal of the second transistor is directly electrically connected to the second wiring, wherein a first terminal of the third transistor is directly electrically connected to a fourth wiring, a second terminal of the third transistor is directly electrically connected to a gate of the first transistor, and a gate of the third transistor is directly electrically connected to the fourth wiring, wherein a first terminal of the fourth transistor is directly electrically connected to the third wiring, a second terminal of the fourth transistor is directly electrically connected to the gate of the first transistor, and a gate of the fourth transistor is directly electrically connected to a fifth wiring, wherein an input terminal of the inverter circuit is directly electrically connected to the gate of the first transistor, and an output terminal of the inverter circuit is directly electrically connected to a gate of the second transistor, wherein a channel region of each of the first to fourth transistors includes an oxide semiconductor, and wherein off-state current of each of the first to fourth transistors is 1 aA/μm or less.