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Wiring line and manufacture process thereof, and semiconductor device and manufacturing process thereof

  • US 7,420,211 B2
  • Filed: 10/18/2004
  • Issued: 09/02/2008
  • Est. Priority Date: 12/18/1998
  • Status: Expired due to Fees
First Claim
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1. A portable telephone comprising:

  • a voice output unit;

    a voice input unit; and

    a display unit,wherein the display unit comprises;

    a semiconductor film formed over a substrate, the semiconductor film having a channel region, a source region and a drain region;

    a gate insulating film over the semiconductor film; and

    a gate electrode formed over the gate insulating film, the gate electrode having a multi-layered film comprising a first conductive layer, a second conductive layer on the first conductive layer, and a third conductive layer on the second conductive layer,wherein a width of the second conductive layer is smaller than those of the first and third conductive layers.

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