Semiconductor device

A display device having at least one driving circuit, the driving circuit comprising:

• a first thin film transistor having a first impurity region electrically connected to a first power source;
• a second thin film transistor having a first impurity region electrically connected to a second power source;
• a third thin film transistor having a first impurity region electrically connected to the first power source;
• a fourth thin film transistor having a first impurity region electrically connected to the second power source, wherein:
• the first to fourth thin film transistors have a same conductivity type;
• a second impurity region of the first thin film transistor and a second impurity region of the second thin film transistor are electrically connected to one terminal of a capacitance;
• a second impurity region of the third thin film transistor, a second impurity region of the fourth thin film transistor, and a gate electrode of the first thin film transistor are electrically connected to the other terminal of the capacitance;
• a gate electrode of the second thin film transistor and a gate electrode of the fourth thin film transistor are electrically connected to a first input signal line;
• and
• a gate electrode of the third thin film transistor is electrically connected to a second input signal line.

A semiconductor device comprising:

• a first thin film transistor having a first impurity region electrically connected to a first power source;
• a second thin film transistor having a first impurity region electrically connected to a second power source;
• a third thin film transistor having a first impurity region electrically connected to the first power source;
• a fourth thin film transistor having a first impurity region electrically connected to the second power source,
• wherein:
• the first to fourth thin film transistors have a same conductivity type;
• a second impurity region of the first thin film transistor and a second impurity region of the second thin film transistor are electrically connected to output signal line;
• a second impurity region of the third thin film transistor and a second impurity region of the fourth thin film transistor are electrically connected to a gate electrode of the first thin film transistor;
• a gate electrode of the second thin film transistor and a gate electrode of the fourth thin film transistor are electrically connected to a first input signal line;
• and
• a gate electrode of the third thin film transistor is electrically connected to a second input signal line.

A display device having at least one driving circuit, the driving circuit comprising:

• a first thin film transistor having a first impurity region electrically connected to a first power source;
• a second thin film transistor having a first impurity region electrically connected to a second power source;
• a third thin film transistor having a first impurity region electrically connected to the first power source;
• a fourth thin film transistor having a first impurity region electrically connected to the second power source, wherein:
• the first to fourth thin film transistors have a same conductivity type;
• a second impurity region of the first thin filxn transistor and a second impurity region of the second thin film transistor are electrically connected to output signal line;
• a second impurity region of the third thin film transistor and a second impurity region of the fourth thin film transistor are electrically connected to a gate electrode of the first thin film transistor;
• a gate electrode of the second thin film transistor and a gate electrode of the fourth thin film transistor are electrically connected to a first input signal line;
• and
• a gate electrode of the third thin film transistor is electrically connected to a second input signal line.

A semiconductor device comprising:

• a first thin film transistor having a first impurity region electrically connected to a first power source;
• a second thin film transistor having a first impurity region electrically connected to a second power source;
• an output amplitude compensating circuit having an input terminal and an output terminal, wherein the output terminal is electrically connected to a gate electrode of the first thin film transistor,
• wherein:
• channel forming regions of the first and second thin film transistors have a same conductivity type;
• a second impurity region of the first thin film transistor and a second impurity region of the second thin film transistor are electrically connected to an output signal line;
• a gate electrode of the second thin film transistor and the input terminal of the output amplitude compensating circuit are electrically connected to an input signal line.

A display device comprising:

• a first thin film transistor having a first impurity region electrically connected to a first power source;
• a second thin film transistor having a first impurity region electrically connected to a second power source;
• an output amplitude compensating circuit having an input terminal and an output terminal, wherein the output terminal is electrically connected to a gate electrode of the first thin film transistor,
• wherein:
• channel forming regions of the first and second thin film transistors have a same conductivity type;
• a second impurity region of the first thin film transistor and a second impurity region of the second thin film transistor are electrically connected to an output signal line;
• a gate electrode of the second thin film transistor and the input terminal of the output amplitude compensating circuit are electrically connected to an input signal line.