# US 12,222,614 B2 · Electro-optical device and electronic apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,222,614 B2 - Document ID: US12222614B2 - Status: Granted - Kind: B2 - Application number: 17/938,941 - Filed: 2022-09-07 - Published: 2023-03-09 - Granted: 2025-02-11 - Earliest claimed: 2021-09-09 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Shinsuke Fujikawa - Web page: https://patentgrep.com/patent/US12222614B2 ## CPC - G02F 1/136204: {Arrangements to prevent high voltage or static electricity failures} - G01K 7/01: using semiconducting elements having PN junctions (G01K7/02, G01K7/16, G01K7/30 take precedence) - G01K 13/00: Thermometers specially adapted for specific purposes - G02F 1/133382: {Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell} - G02F 1/136286: {Wiring, e.g. gate line, drain line} - H02H 9/046: {responsive to excess voltage appearing at terminals of integrated circuits} - G02F 1/13452: {Conductors connecting driver circuitry and terminals of panels} - H05K 1/18: structurally associated with non-printed electric components (H05K1/16 takes precedence) - H05K 2201/10015: Non-printed capacitor - H05K 2201/10136: Liquid Crystal display [LCD] - H05K 2201/10507: Involving several components - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00) - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract In an electro-optical device, a first substrate is provided with a temperature detection element and an electro-static protection circuit that protects the temperature detection element from a surge current. A first resistor element is electrically coupled to the temperature detection element in series. The electro-static protection circuit includes a transistor electrically coupled to the first resistor element and the temperature detection element in parallel. A first capacitance element is provided on a wiring substrate electrically coupled to the first substrate, and is provided between a first coupling wiring line electrically coupled to one side of the temperature detection element and a second coupling wiring line electrically coupled to the other side thereof. ## Claims ### Claim 1 An electro-optical device comprising: a temperature detection element; a first resistor element electrically coupled to the temperature detection element in series; and an electro-static protection circuit including a transistor electrically coupled to the first resistor element and the temperature detection element in parallel. ### Claim 2 (depends on 1) The electro-optical device according to claim 1, comprising: a first terminal; a first wiring line configured to electrically couple the transistor and the first resistor element to the first terminal; a second terminal; and a second wiring line configured to electrically couple the transistor and the temperature detection element to the second terminal. ### Claim 3 (depends on 2) The electro-optical device according to claim 2, comprising a second resistor element electrically coupled to an electrode, of the temperature detection element, on an opposite side from an electrode electrically coupled to the first resistor element, wherein the electro-static protection circuit is electrically coupled to the first resistor element, the temperature detection element, and the second resistor element in parallel. ### Claim 4 (depends on 2) The electro-optical device according to claim 2, wherein the electro-static protection circuit includes a third resistor element, and a resistance value of the third resistor element is greater than a resistance value of the first resistor element. ### Claim 5 (depends on 3) The electro-optical device according to claim 3, wherein the electro-static protection circuit includes a fourth resistor element, and a resistance value of the fourth resistor element is greater than a resistance value of the second resistor element. ### Claim 6 (depends on 2) The electro-optical device according to claim 2, wherein the temperature detection element and the electro-static protection circuit are provided outside a display region. ### Claim 7 (depends on 6) The electro-optical device according to claim 6, comprising a wiring substrate electrically coupled to the first terminal and the second terminal, wherein the wiring substrate includes a first coupling wiring line and a second coupling wiring line, the first coupling wiring line being electrically coupled to the first wiring line via the first terminal, the second coupling wiring line being electrically coupled to the second wiring line via the second terminal. ### Claim 8 (depends on 7) The electro-optical device according to claim 7, comprising a first capacitance element having one electrode electrically coupled to the first wiring line and another electrode electrically coupled to the second wiring line. ### Claim 9 (depends on 8) The electro-optical device according to claim 8, wherein on the wiring substrate, the first capacitance element has the one electrode electrically coupled to the first coupling wiring line, and the other electrode electrically coupled to the second coupling wiring line. ### Claim 10 (depends on 9) The electro-optical device according to claim 9, wherein the wiring substrate has a first end coupled to an electro-optical panel, and a second end on an opposite side from the first end, and a distance from the first capacitance element to the first end is shorter than a distance from the first capacitance element to the second end. ### Claim 11 (depends on 10) The electro-optical device according to claim 10, wherein the wiring substrate is provided with a drive circuit element configured to output an image signal to the electro-optical panel, and a distance from the drive circuit element to the first end is shorter than the distance from the first capacitance element to the first end. ### Claim 12 (depends on 10) The electro-optical device according to claim 10, wherein the first coupling wiring line includes a first extending portion and a second extending portion, the first extending portion extending from the first capacitance element to the second end, the second extending portion extending from the first capacitance element to the first end, and the first extending portion has a wider part than the second extending portion. ### Claim 13 (depends on 10) The electro-optical device according to claim 10, wherein the wiring substrate includes a first wiring substrate and a second wiring substrate, the first wiring substrate having the first end, the second wiring substrate being electrically coupled to the first wiring substrate and having the second end. ### Claim 14 (depends on 10) The electro-optical device according to claim 10, comprising a temperature detection drive circuit configured to supply a constant current to the temperature detection element via the first coupling wiring line and the second coupling wiring line, and configured to detect a voltage of the first coupling wiring line and the second coupling wiring line when the constant current is supplied, wherein the temperature detection drive circuit includes a second capacitance element between a wiring line electrically coupled to the first coupling wiring line and a wiring line electrically coupled to the second coupling wiring line, and an electro-static capacitance of the second capacitance element is smaller than an electro-static capacitance of the first capacitance element. ### Claim 15 (depends on 1) An electronic apparatus comprising the electro-optical device according to claim 1.