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Driver circuit, display device including the driver circuit, and electronic appliance including the display device

  • US 9,406,398 B2
  • Filed: 10/31/2013
  • Issued: 08/02/2016
  • Est. Priority Date: 09/24/2009
  • Status: Active Grant
First Claim
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1. A semiconductor device comprising a shift register circuit, the shift register circuit comprising:

  • a first transistor;

    a second transistor; and

    a third transistor,wherein each of the first transistor, the second transistor, the third transistor, and the fourth transistor includes a gate electrode, a gate insulating film, and an oxide semiconductor layer,wherein the first transistor, the second transistor, and the third transistor are depletion-mode transistors,wherein one of a source and a drain of the first transistor is connected to one of a source and a drain of the second transistor,wherein a gate of the first transistor is connected to the other of the source and the drain of the first transistor,wherein one of a source and a drain of the third transistor is connected to a gate of the second transistor,wherein a first signal is input to a gate of the third transistor, andwherein an amplitude voltage of the first signal is greater than a potential difference between the other of the source and the drain of the first transistor and the other of the source and the drain of the second transistor.

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