Patent ID: 8017951
Filing Date: 2011-09-13
Classification: G02F,H01L

Abstract:
1. A display device, comprising: a semiconductor island over an insulating surface; an insulating film over the semiconductor island; a first conductive film over the insulating film; and a second conductive film over the first conductive film, wherein an edge of the first conductive film extends beyond an edge of the second conductive film, wherein the first conductive film has a tapered shape, wherein the second conductive film has a tapered shape, wherein an angle between a side surface of the second conductive film and a bottom surface of the second conductive film is larger than an angle between a side surface of the first conductive film and a bottom surface of the first conductive film, wherein the insulating film has a first portion which is covered with the first conductive film and a second portion which is not covered with the first conductive film, and wherein a thickness of the second portion is smaller than a thickness of the first portion.