Patent ID: 8368077
Filing Date: 2013-02-05
Classification: H01L

Abstract:
1. A display device comprising: a substrate; gate electrodes which are formed on the substrate; a first insulation layer which is formed on the substrate and is formed of at least one layer such that the first insulation layer includes portions which cover the gate electrodes and portions which do not overlap with the gate electrodes; source regions and drain regions which are formed on the first insulation layer such that the source region and the drain region are arranged at positions which avoid an area above at least a portion of at least one of the gate electrodes; a second insulation layer which is formed by stacking a plurality of layers made of different materials from each other in a mutually contact manner such that the second insulation layer covers respective ones of the gate electrodes from above and covers the source regions and the drain regions, and in which at least one of first contact holes which reaches at least one of the source regions and at least another of the first contact holes which reaches at least one of the drain regions are formed; and first line layers which are formed such that each first line layer covers each first contact hole; wherein at least one second contact hole which reaches the at least one of the gate electrodes is formed in the first and the second insulation layers, a stepped portion is formed on an inner surface of the at least one second contact hole, and a second line layer is formed on the inner surface of the at least one second contact hole such that the second line layer passes over the stepped portion.