Patent ID: 9627417
Date: 2017-04-18
CPC Classifications: H01L

Claim:
1. A method of manufacturing a display apparatus, the method comprising the steps of: preparing a substrate including a pixel circuit region and a driving circuit region; forming a first active layer at the pixel circuit region of the substrate; forming a second active layer at the driving circuit region of the substrate; forming gate electrodes that overlap the first active layer and the second active layer, respectively, with a gate insulating layer disposed therebetween; forming a first insulating layer on the substrate so as to cover the first active layer and the second active layer; forming a first contact hole that passes through the first insulating layer until a portion of the first active layer, among the first active layer and the second active layer, is exposed; heat-treating the substrate where the first insulating layer, having the first contact hole passing through it, is formed; and forming a second contact hole that passes through the first insulating layer disposed on the heat-treated substrate until a portion of the second active layer is exposed; wherein the first active layer and the second active layer are formed during a same mask process and comprise a same material, and wherein a hydrogen concentration of the first active layer that is adjacent to the first contact hole is less than a hydrogen concentration of the second active layer that is adjacent to the second contact hole.