Patent ID: 11899311
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A liquid crystal display device comprising:
a substrate;
a gate electrode over the substrate;
a gate insulating layer over the gate electrode;
a first oxide semiconductor layer over the gate insulating layer;
a second oxide semiconductor layer over the first oxide semiconductor layer;
a source electrode and a drain electrode electrically connected to the second oxide semiconductor layer;
a first insulating layer over the second oxide semiconductor layer; and
a first electrode of a display element over the first insulating layer and electrically connected to the source electrode or the drain electrode via an opening in the first insulating layer,
wherein the first oxide semiconductor layer comprises a first element, a second element, and a third element, and
wherein the second oxide semiconductor layer comprises the first element, the second element, and the third element.