Patent ID: 9214532
Filing Date: 2015-12-15
Classification: H01L

Abstract:
1. A display device comprising: a pixel circuit over a substrate, comprising: a pixel TFT comprising: wherein the gate electrode is a portion of the gate wiring, wherein the first portion of the semiconductor layer is overlapped with the source wiring, an insulating film comprising silicon nitride over the pixel TFT, wherein the gate electrode comprises a first conductive layer, a second conductive layer provided over the first conductive layer, and a third conductive layer provided over the second conductive layer, the third conductive layer being in direct contact with a side surface of the second conductive layer, a side surface of the first conductive layer, and the gate insulating film; wherein the first conductive layer and the third conductive layer each comprise a material selected from the group consisting of titanium, tantalum, tungsten and molybdenum, and wherein the second conductive layer comprises a material selected from the group consisting of aluminum and copper.