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Display device

  • US 9,825,057 B2
  • Filed: 11/25/2014
  • Issued: 11/21/2017
  • Est. Priority Date: 12/02/2013
  • Status: Active Grant
First Claim
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1. A display device comprising:

  • a pixel portion over a substrate; and

    a driver circuit configured to drive the pixel portion over the substrate,wherein the pixel portion comprises a first transistor comprising a first oxide semiconductor film,wherein the driver circuit comprises a second transistor comprising a second oxide semiconductor film and a third oxide semiconductor film,wherein the second transistor has a larger number of oxide semiconductor films than the first transistor,wherein the first oxide semiconductor film and the second oxide semiconductor film have different compositions,wherein a channel length of the first transistor is longer than a channel length of the second transistor,wherein the third oxide semiconductor film is in contact with a side surface of the second oxide semiconductor film,wherein the second oxide semiconductor film comprises indium and zinc, andwherein a proportion of indium atoms is higher than a proportion of zinc atoms in the second oxide semiconductor film.

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