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Display device and electronic device including display device

  • US 9,165,502 B2
  • Filed: 11/13/2014
  • Issued: 10/20/2015
  • 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 second transistor comprises a first gate electrode, a second gate electrode and an oxide semiconductor layer, the first gate electrode being electrically connected to the scan line,wherein one of a source electrode and a drain electrode of the second transistor is electrically connected to a gate electrode of the first transistor,wherein the other of the source electrode and the drain electrode of the second transistor is electrically connected to the signal line,wherein one of a source electrode and a drain electrode of the first transistor is electrically connected to the wiring,wherein the other of the source electrode and the drain electrode of the first transistor is electrically connected to a first electrode of the light-emitting element,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 oxide semiconductor layer includes a channel formation region,wherein when the second transistor is off state, a drain current of the second transistor per a channel width of 1 μ

    m is less than or equal to 1×

    10

    16
    A/μ

    m, andwherein the first gate electrode and the second gate electrode overlap with the channel formation region and sandwich the oxide semiconductor layer.

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