Display device

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 includes an impurity element serving as a donor in a channel formation region.

A display device comprising:

• a driver circuit portion including a logic circuit portion and a switch portion;
• a pixel portion;
• and
• a protection circuit configured to transfer charge to a common wiring when a surge voltage is applied,
• 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.

A display device comprising:

• a driver circuit portion including a logic circuit portion and a switch portion;
• a pixel portion;
• and
• a protection circuit configured to transfer charge to a common wiring when a surge voltage is applied,
• 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 includes an impurity element serving as a donor in a channel formation region.