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

Claim 1:
2. A liquid crystal display device comprising:
a glass substrate;
a gate electrode over the glass 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 liquid crystal 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 at least one of indium, gallium, and zinc,
wherein the second oxide semiconductor layer comprises at least one of indium, gallium, and zinc,
wherein the first oxide semiconductor layer comprises a first region,
wherein the second oxide semiconductor layer comprises a second region,
wherein the first region has a smaller thickness than the second region, and
wherein the first oxide semiconductor layer comprises a channel region of a first transistor.