Patent ID: 8284142

Claim:
A display device comprising: a driver circuit portion including a logic circuit portion and a switch portion; and a pixel portion, wherein the pixel portion includes a first inverted staggered thin film transistor and a pixel electrode electrically connected to the first inverted staggered thin film transistor, wherein the switch portion includes a second inverted staggered thin film transistor in which a microcrystalline semiconductor is used, wherein the logic circuit portion includes an inverter circuit including a third inverted staggered thin film transistor and a fourth inverted staggered thin film transistor, wherein the first to fourth inverted staggered thin film transistors have the same polarity, and wherein the second inverted staggered thin film transistor comprises a first insulating layer, the microcrystalline semiconductor, and a second insulating layer interposed between a first gate electrode and a second gate electrode.