DRIVING METHOD OF AN ELECTRIC CIRCUIT
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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
13 Claims
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1. (canceled)
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2. An active matrix display device comprising:
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a pixel portion formed over a substrate, and comprising a first TFT; and a driver circuit formed over the substrate, and comprising a shift register 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, and wherein a signal through the first analog switch is an output signal of the shift register. - View Dependent Claims (3, 4, 5, 6, 7)
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8. An active matrix display device comprising:
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a pixel portion formed over a substrate, and comprising a first TFT; and a driver circuit formed over the substrate, and comprising a shift register 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 signal through the first analog switch is an output signal of the shift register, and wherein the first analog switch and the second analog switch comprise transistors having a same conductivity. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification