Driving method of an electric circuit
First Claim
Patent Images
1. An active matrix display device comprising:
- a pixel portion over a substrate, the pixel portion comprising a first TFT; and
a driver circuit over the substrate, the driver circuit comprising;
a flip-flop comprising a second TFT;
a first analog switch; and
a second analog switch,wherein switching of the first analog switch and switching of the second analog switch are controlled depending on an output signal of the flip-flop,wherein a first clock signal is input to an input terminal of the first analog switch, andwherein a second clock signal is input to an input terminal of the second analog switch.
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Abstract
A variation in threshold may be suppressed by structuring an analog switch by a MOS transistor and forming a signal synchronized to a clock by making the clock which is a common signal in continuity or discontinuity. An object of the present invention is to reduce the variation in the signal synchronized to the clock by the variation in threshold of the MOS transistor in a circuit which is synchronized to the clock.
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Citations
35 Claims
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1. An active matrix display device comprising:
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a pixel portion over a substrate, the pixel portion comprising a first TFT; and a driver circuit over the substrate, the driver circuit comprising; a flip-flop comprising a second TFT; a first analog switch; and a second analog switch, wherein switching of the first analog switch and switching of the second analog switch are controlled depending on an output signal of the flip-flop, wherein a first clock signal is input to an input terminal of the first analog switch, and wherein a second clock signal is input to an input terminal of the second analog switch. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An active matrix display device comprising:
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a pixel portion over a substrate, the pixel portion comprising a first TFT; a gate driver circuit over the substrate, the gate driver circuit comprising; a flip-flop comprising a second TFT; a first analog switch; and a second analog switch; and a gate signal line directly connected to a gate of the first TFT, and electrically connected to the gate driver circuit, wherein switching of the first analog switch and switching of the second analog switch are controlled depending on an output signal of the flip-flop, and wherein switching of the first TFT is controlled depending on an output signal of the first analog switch. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An active matrix display device comprising:
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a pixel portion over a substrate, the pixel portion comprising a first TFT; a gate driver circuit over the substrate, the gate driver circuit comprising; a flip-flop comprising a second TFT; a first analog switch; and a second analog switch; and a gate signal line directly connected to a gate of the first TFT, the gate signal line electrically connected to the gate driver circuit, wherein switching of the first analog switch and switching of the second analog switch are controlled depending on an output signal of the flip-flop, wherein a first clock signal is input to an input terminal of the first analog switch, wherein a second clock signal is input to an input terminal of the second analog switch, and wherein switching of the first TFT is controlled depending on an output signal of the first analog switch. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An active matrix display device comprising:
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a pixel portion over a substrate, the pixel portion comprising a first TFT; and a driver circuit over the substrate, the driver circuit comprising; a flip-flop comprising a second TFT; and an analog switch, wherein switching of the analog switch is controlled depending on an output signal of the flip-flop, and wherein a clock signal is input to an input terminal of the analog switch. - View Dependent Claims (21, 22, 23, 24)
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25. An active matrix display device comprising:
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a pixel portion over a substrate, the pixel portion comprising a first TFT; and a gate driver circuit over the substrate, the gate driver circuit comprising; a flip-flop comprising a second TFT; and an analog switch, wherein switching of the analog switch is controlled depending on an output signal of the flip-flop, wherein a clock signal is input to an input terminal of the analog switch, and wherein switching of the first TFT is controlled depending on an output signal of the analog switch. - View Dependent Claims (26, 27, 28, 29)
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30. An active matrix display device comprising:
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a pixel portion over a substrate, the pixel portion comprising a first TFT; a gate driver circuit over the substrate, the gate driver circuit comprising; a flip-flop comprising a second TFT; and an analog switch; and a gate signal line directly connected to a gate of the first TFT, the gate signal line electrically connected to the gate driver circuit, wherein switching of the analog switch is controlled depending on an output signal of the flip-flop, wherein a clock signal is input to an input terminal of the analog switch, and wherein switching of the first TFT is controlled depending on an output signal of the analog switch. - View Dependent Claims (31, 32, 33, 34, 35)
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Specification