Semiconductor device, display device, and electronic device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorYasunori Yoshida
Life of this patent
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Abstract
To provide a semiconductor device which operates stably with few malfunctions due to noise, with low power consumption, and little variation in characteristics; a display device including the semiconductor device; and an electronic device including the display device. An output terminal is connected to a power supply line, thereby reducing variation in electric potential of the output terminal. In addition, a gate electrode potential which turns ON a transistor is maintained due to the capacitance of the transistor. Further, change in characteristics of the transistor is reduced by a signal line for reverse bias.
Claims19
A semiconductor device comprising:
- an input terminal;
- an output terminal;
- a first terminal;
- a second terminal;
- a third terminal;
- and
- a fourth terminal;
- a first transistor for transmitting electric potential of the first terminal to the output terminal;
- a second transistor which fixes electric potential of the output terminal by conducting electricity between the output terminal and the second terminal in accordance with electric potential of the fourth terminal, and
- a third transistor which fixes electric potential of the third terminal by conducting electricity between the third terminal and the second terminal in accordance with the electric potential of the fourth terminal,
- wherein a first pulse is input from the input terminal,
- wherein a second pulse reversed to the first pulse is input from the fourth terminal, and
- wherein at least one of the first transistor, the second transistor and the third transistor comprises a semiconductor film comprising amorphous silicon.
A display device comprising:
- a pixel area;
- a data line driver;
- and
- a scan line driver, the scan line driver comprising:
- an input terminal;
- an output terminal;
- a first terminal;
- a second terminal;
- a third terminal;
- and
- a fourth terminal;
- a first transistor for transmitting electric potential of the first terminal to the output terminal;
- a second transistor which fixes electric potential of the output terminal by conducting electricity between the output terminal and the second terminal in accordance with electric potential of the fourth terminal, and
- a third transistor which fixes electric potential of the third terminal by conducting electricity between the third terminal and the second terminal in accordance with the electric potential of the fourth terminal,
- wherein a first pulse is input from the input terminal, and
- wherein a second pulse reversed to the first pulse is input from the fourth terminal.
A liquid crystal display device, comprising:
- a pixel area comprising a liquid crystal element;
- a data line driver;
- and
- a scan line driver, the scan line driver comprising:
- an input terminal;
- an output terminal;
- a first terminal;
- a second terminal;
- a third terminal;
- and
- a fourth terminal;
- a first transistor for transmitting electric potential of the first terminal to the output terminal;
- a second transistor which fixes electric potential of the output terminal by conducting electricity between the output terminal and the second terminal in accordance with electric potential of the fourth terminal, and
- a third transistor which fixes electric potential of the third terminal by conducting electricity between the third terminal and the second terminal in accordance with the electric potential of the fourth terminal,
- wherein a first pulse is input from the input terminal, and
- wherein a second pulse reversed to the first pulse is input from the fourth terminal.
Dependencies are inferred from the claim text.