Patent ID: 9620650
Date: 2017-04-11
CPC Classifications: H01L

Claim:
1. A display device comprising: a gate electrode layer; a first insulating layer over the gate electrode layer; a first oxide semiconductor layer over the first insulating layer; a second oxide semiconductor layer over the first oxide semiconductor layer; a third oxide semiconductor layer over the second oxide semiconductor layer, wherein the third oxide semiconductor layer covers side surfaces in end portions of the first oxide semiconductor layer and side surfaces in end portions of the second oxide semiconductor layer; a source electrode layer and a drain electrode layer on and in contact with the third oxide semiconductor layer; a second insulating layer over the source electrode layer and the drain electrode layer; and a pixel electrode electrically connected to the source electrode layer and the drain electrode layer, wherein the second oxide semiconductor layer comprises indium, gallium, and zinc, and wherein the second oxide semiconductor layer and the third oxide semiconductor layer comprise crystals.