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US 8,541,785 B2Granted
Display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsKunio Hosoya, Saishi Fujikawa, Yukie Suzuki
Life of this patent
Estimating the term…
Abstract
An object is to reduce an occupied area of a protection circuit. Another object is to increase the reliability of a display device including the protection circuit. The protection circuit includes a first wiring over a substrate, an insulating film over the first wiring, and a second wiring over the insulating film.
Claims12
A display device comprising:
- a thin film transistor over a substrate, the thin film transistor including a gate wiring, a gate insulating film over the gate wiring, and a source wiring and a drain wiring over the gate wiring;
- a first wiring over the substrate, the first wiring comprising a same material as the gate wiring;
- an insulating film over the first wiring, the insulating film comprising a same material as the gate insulating film;
- and
- a second wiring over the insulating film, the second wiring comprising a same material as the source wiring and the drain wiring,
- wherein the insulating film includes a depressed portion which is overlapped with the first wiring and the second wiring, wherein the first wiring is not in contact with a bottom of the depressed portion,
- wherein part of the second wiring is provided inside the depressed portion, and
- wherein the first wiring, the insulating film and the second wiring form a protection circuit.
5 more elements
A display device comprising:
- a thin film transistor over a substrate, the thin film transistor including a gate wiring, a gate insulating film over the gate wiring, and a source wiring and a drain wiring over the gate wiring;
- a first wiring over the substrate, the first wiring comprising a same material as the gate wiring;
- an insulating film over the first wiring, the insulating film comprising a same material as the gate insulating film;
- and
- a second wiring over the insulating film, the second wiring comprising a same material as the source wiring and the drain wiring,
- wherein the insulating film includes a depressed portion which is overlapped with the first wiring and the second wiring, wherein the first wiring is not in contact with a bottom of the depressed portion,
- wherein the first wiring includes an opening portion which is overlapped with the depressed portion,
- wherein part of the second wiring is provided inside the depressed portion, and
- wherein the first wiring, the insulating film and the second wiring form a protection circuit.
6 more elements
Dependencies are inferred from the claim text.