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Display device and electronic device including display device

  • US 10,083,651 B2
  • Filed: 10/13/2015
  • Issued: 09/25/2018
  • Est. Priority Date: 10/21/2009
  • Status: Active Grant
First Claim
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1. A display device comprising:

  • a scan line;

    a signal line;

    a wiring; and

    a pixel region comprising;

    a first transistor;

    a second transistor; and

    a light-emitting element,wherein the first transistor comprises a first oxide semiconductor layer and a first gate electrode over the first oxide semiconductor layer, the first gate electrode of the first transistor being electrically connected to the scan line,wherein the second transistor comprises a second gate electrode, a third gate electrode and a second oxide semiconductor layer, the second gate electrode being electrically connected to one of a source electrode and a drain electrode of the first transistor,wherein the other of the source electrode and the drain electrode of the first transistor is electrically connected to the signal line,wherein one of a source electrode and a drain electrode of the second transistor is electrically connected to a first electrode of the light-emitting element,wherein the other of the source electrode and the drain electrode of the second transistor is electrically connected to the wiring,wherein a first voltage applied to the wiring is greater than a second voltage applied to a second electrode of the light-emitting element,wherein the second gate electrode overlaps with the third gate electrode with the second oxide semiconductor layer interposed therebetween,wherein the second gate electrode is over the third gate electrode, the source electrode and the drain electrode of the second transistor,wherein the first transistor is a top gate transistor,wherein the third gate electrode overlaps a whole area of the second oxide semiconductor layer overlap with the third gate electrode, andwherein each of the first oxide semiconductor layer and the second oxide semiconductor layer comprises a crystalline region.

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