# US 8,541,785 B2 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,541,785 B2 - Document ID: US8541785B2 - Status: Granted - Kind: B2 - Application number: 12/366,067 - Filed: 2009-02-05 - Published: 2009-08-20 - Granted: 2013-09-24 - Earliest claimed: 2008-02-15 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Kunio Hosoya; Saishi Fujikawa; Yukie Suzuki - Inventors: Kunio Hosoya; Saishi Fujikawa; Yukie Suzuki - Web page: https://patentgrep.com/patent/US8541785B2 ## CPC - H10D 89/931: {characterised by the dispositions of the protective arrangements} - H10D 86/441: {Interconnections, e.g. scanning lines} - H10D 86/451: {characterised by the compositions or shapes of the interlayer dielectrics} - H10D 86/60: wherein the TFTs are in active matrices - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The display device according to claim 1, further comprising a microcrystalline semiconductor film provided between the first wiring and the second wiring. ### Claim 3 (depends on 1) The display device according to claim 1, further comprising a pixel portion including the thin film transistor, and wherein one of the first wiring and the second wiring is electrically connected to the thin film transistor. ### Claim 4 (depends on 1) The display device according to claim 1, further comprising a pixel portion including the thin film transistor and a terminal portion connected to a semiconductor integrated circuit or a flexible printed circuit, and wherein the protection circuit is provided between the pixel portion and the terminal portion. ### Claim 5 (depends on 1) The display device according to claim 1, further comprising a pixel portion including the thin film transistor and a terminal portion connected to a semiconductor integrated circuit or a flexible printed circuit, and wherein the protection circuit, the pixel portion and the terminal portion are provided over the substrate. ### Claim 6 (depends on 1) The display device according to claim 1, wherein the display device is incorporated in one selected from the group consisting of a television device, a cellular phone, and a portable computer. ### Claim 7 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. ### Claim 8 (depends on 7) The display device according to claim 7, further comprising a microcrystalline semiconductor film provided between the first wiring and the second wiring. ### Claim 9 (depends on 7) The display device according to claim 7, further comprising a pixel portion including the thin film transistor, and wherein one of the first wiring and the second wiring is electrically connected to the thin film transistor. ### Claim 10 (depends on 7) The display device according to claim 7, further comprising a pixel portion including the thin film transistor and a terminal portion connected to a semiconductor integrated circuit or a flexible printed circuit, and wherein the protection circuit is provided between the pixel portion and the terminal portion. ### Claim 11 (depends on 7) The display device according to claim 7, further comprising a pixel portion including the thin film transistor and a terminal portion connected to a semiconductor integrated circuit or a flexible printed circuit, and wherein the protection circuit, the pixel portion and the terminal portion are provided over the substrate. ### Claim 12 (depends on 7) The display device according to claim 7, wherein the display device is incorporated in one selected from the group consisting of a television device, a cellular phone, and a portable computer.