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Light-emitting display device and electronic device including the same

  • US 9,318,654 B2
  • Filed: 07/08/2013
  • Issued: 04/19/2016
  • Est. Priority Date: 10/09/2009
  • Status: Active Grant
First Claim
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1. A display device comprising:

  • a first conductive layer;

    a second conductive layer serving as a signal line;

    a third conductive layer;

    a transistor comprising a channel formation region in an oxide semiconductor layer comprising indium, gallium and zinc, the oxide semiconductor layer being over the first conductive layer with a first insulating layer provided therebetween;

    a second insulating layer over and in contact with the channel formation region; and

    a pixel electrode,wherein the first conductive layer comprises a first region serving as a gate electrode of the transistor,wherein the channel formation region and the first region overlap with each other,wherein the first insulating layer and the second insulating layer each comprise silicon oxide,wherein the first conductive layer comprises a second region which extends through an edge of the oxide semiconductor layer in a channel width direction,wherein the first conductive layer comprises a third region whose width is smaller than a width of the first region,wherein the third region serves as a scan line,wherein the signal line is electrically connected to one of a source and a drain of the transistor,wherein the other of the source and the drain of the transistor is electrically connected to the third conductive layer,wherein the third conductive layer is electrically connected to the pixel electrode,wherein a part of the second conductive layer and a part of the third conductive layer are provided over the oxide semiconductor layer,wherein a first width of the oxide semiconductor layer in the channel width direction is larger than a length of the channel formation region,wherein a second width of the oxide semiconductor layer in a channel length direction is larger than the width of the third region, andwherein the second width is larger than the first width.

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