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Thin film transistor and flat display device

  • US 10,600,817 B2
  • Filed: 10/04/2018
  • Issued: 03/24/2020
  • Est. Priority Date: 12/24/2010
  • Status: Active Grant
First Claim
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1. A display device, comprising:

  • a thin film transistor (TFT), the TFT including;

    a scan line,an active layer including an oxide semiconductor, the active layer having a first region, a second region, and a third region that are linearly and sequentially aligned along a first direction, the second region being a channel region between the first region and the third region,an insulating layer between the active layer and the scan line, wherein the scan line, the insulating layer, and the active layer are sequentially stacked on a substrate along a third direction, the insulating layer covering the scan line, the third direction being substantially perpendicular to the first direction,a first electrode having a first contact portion contacted with the first region of the active layer, anda second electrode having a second contact portion contacted with the third region of the active layer;

    a first capacitor electrode on a substrate;

    a second capacitor electrode connected to the second electrode of the TFT, the second capacitor electrode being insulated from the first capacitor electrode; and

    a pixel electrode connected to the second electrode of the TFT and to the second capacitor electrode,wherein the scan line includes a straight portion extending along the first direction,wherein the first contact portion and the second contact portion overlap with edge portions of the scan line in a second direction, the second direction being substantially perpendicular to the first direction and the third direction,wherein the straight portion of the scan line includes a first portion that overlaps the first and second contact portions, and second portions that do not overlap the first and second electrodes and disposed at both sides of the first portion in the first direction, andwherein a width of the first electrode and a width of the second electrode in the second direction are larger than widths of the second portions of the straight portion in the second direction,the first contact portion overlaps an end portion of the first region of the active layer at one side of the active layer in the first direction, andthe second contact portion overlaps an end portion of the third region of the active layer at an opposite side of the active layer in the first direction.

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