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Display device and electronic appliance

  • US 9,711,537 B2
  • Filed: 06/07/2016
  • Issued: 07/18/2017
  • Est. Priority Date: 09/13/2012
  • Status: Expired due to Fees
First Claim
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1. A display device comprising:

  • a transistor comprising;

    a gate electrode;

    a first insulating film over the gate electrode;

    a first oxide film over the first insulating film;

    a second oxide film over the first oxide film;

    a third oxide film over the second oxide film; and

    a first conductive film over the third oxide film;

    a second insulating film over the first conductive film and the third oxide film;

    a second conductive film over the second insulating film; and

    a connection portion comprising;

    the first insulating film;

    a third conductive film over the first insulating film;

    the second insulating film over the third conductive film; and

    a fourth conductive film over the second insulating film,wherein the second conductive film is electrically connected to the first conductive film through a first opening provided in the second insulating film,wherein the fourth conductive film is electrically connected to the third conductive film through a second opening provided in the second insulating film,wherein the first conductive film comprises the same material as the third conductive film,wherein the second conductive film comprises the same material as the fourth conductive film,wherein an atomic ratio of components in the first oxide film is different from an atomic ratio of components in the second oxide film, andwherein an atomic ratio of components in the third oxide film is different from the atomic ratio of components in the second oxide film.

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