Patent ID: 9099359
Filing Date: 2015-08-04
Classification: H01L

Abstract:
1. A display device comprising: a thin film transistor having a gate electrode formed above a substrate, a semiconductor layer formed above the gate electrode, a gate insulating film formed between the semiconductor layer and the gate electrode, a source electrode, and a drain electrode, the source electrode and the drain electrode being formed on an upper surface of the semiconductor layer; an electrode layer formed in the same layer as the gate electrode and at a predetermined position on the substrate so as to be in contact with a lower portion of the gate insulating film; a through-hole formed on the top of the electrode layer and formed in the gate insulating film; and a wiring film connected to the electrode layer via the through-hole, wherein the wiring film is formed of a metal layer in the same layer as the source electrode and the drain electrode, and is directly in contact with the gate insulating film and the electrode layer at the through-hole; wherein based on a surface of the substrate, the through-hole includes: a first taper portion having a first taper angle, a second taper portion formed higher than the first taper portion and having a second taper angle different from the first taper angle, and a third taper portion formed higher than the second taper portion and having a third taper angle different from the second taper angle, wherein the through-hole is formed only in the gate insulating film which is a single layer, and the first taper portion, the second taper portion, and the third taper portion are formed in the single layer gate insulating film.