# US 2021/0278730 A1 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0278730 A1 - Document ID: US20210278730A1 - Status: Published application - Kind: A1 - Application number: 17/183,776 - Filed: 2021-02-24 - Published: 2021-09-09 - Earliest claimed: 2020-03-03 - Assignees: Sharp Kabushiki Kaisha - Applicants: Sharp Kabushiki Kaisha - Inventors: KAZUMA HIRAO - Web page: https://patentgrep.com/patent/US20210278730A1 ## CPC - G02F 1/1309: {Repairing; Testing} - G02F 1/136272: {Auxiliary lines} - G02F 1/136254: {Checking; Testing} - G02F 1/136286: {Wiring, e.g. gate line, drain line} - G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} - H05K 1/0268: {for electrical inspection or testing} - H05K 1/189: characterised by the use of flexible or folded printed circuits - H05K 1/147: {at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit (H05K1/148 takes precedence)} - H05K 3/323: {by applying an anisotropic conductive adhesive layer over an array of pads} - H05K 2201/10136: Liquid Crystal display [LCD] - 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 - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract A display device includes a display panel, a flexible printed circuit board having a connection to the display panel by using a film material, a control board having a connection to the flexible printed circuit board by using the film material, and a semiconductor integrated circuit fixed on the display panel by using the film material and functioning as a drive circuit of the display panel. The semiconductor integrated circuit includes an inspection terminal, and the display panel, the flexible printed circuit board, and the control board are provided with an inspection wiring line having one end connected to the inspection terminal and the other end to which a power supply voltage is applied on the control board. The semiconductor integrated circuit includes a built-in resistor and a switching element provided in series between the inspection terminal and a ground, and an abnormality detection circuit that detects an abnormality in a resistance of the connections using the film material based on an output voltage of a resistance dividing circuit constituted by a resistance of the inspection wiring line and the built-in resistor. ## Claims ### Claim 1 A display device comprising: a display panel; a flexible printed circuit board having a connection to the display panel by using a film material; a control board having a connection to the flexible printed circuit board by using the film material; and a semiconductor integrated circuit fixed on the display panel by using the film material and functioning as a drive circuit of the display panel, wherein the semiconductor integrated circuit includes an inspection terminal; the display panel, the flexible printed circuit board, and the control board are provided with an inspection wiring line having one end connected to the inspection terminal and the other end to which a power supply voltage is applied on the control board; and the semiconductor integrated circuit includes a built-in resistor provided between the inspection terminal and a ground, a switching element provided in series with the built-in resistor between the inspection terminal and the ground, and an abnormality detection circuit that detects an abnormality in a resistance of the connections using the film material based on an output voltage of a resistance dividing circuit constituted by a resistance of the inspection wiring line and the built-in resistor. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the display panel is a liquid crystal panel. ### Claim 3 (depends on 1) The display device according to claim 1, wherein the film material is an anisotropic conductive film. ### Claim 4 A display device comprising: a display panel; a flexible printed circuit board having a connection to the display panel by using a film material; a control board having a connection to the flexible printed circuit board by using the film material; and a semiconductor integrated circuit fixed on the display panel by using the film material and functioning as a drive circuit of the display panel, wherein the semiconductor integrated circuit includes a first inspection terminal and a second inspection terminal; the display panel, the flexible printed circuit board, and the control board are provided with a first inspection wiring line having one end connected to the first inspection terminal and the other end to which a power supply voltage is applied on the control board, and a second inspection wiring line having one end connected to the second inspection terminal and the other end to which the power supply voltage is applied on the control board; and the semiconductor integrated circuit includes a first built-in resistor provided between the first inspection terminal and a ground, a second built-in resistor provided between the second inspection terminal and the ground, and an abnormality detection circuit that detects an abnormality in a resistance of the connections using the film material based on an output voltage of a resistance dividing circuit constituted by a resistance of the first inspection wiring line and the first built-in resistor and on an output voltage of a resistance dividing circuit constituted by a resistance of the second inspection wiring line and the second built-in resistor. ### Claim 5 (depends on 4) The display device according to claim 4, wherein the semiconductor integrated circuit includes a first switching element provided in series with the first built-in resistor between the first inspection terminal and the ground and a second switching element provided in series with the second built-in resistor between the second inspection terminal and the ground. ### Claim 6 (depends on 4) The display device according to claim 4, wherein the flexible printed circuit board has two sides extending in a direction connecting the display panel and the control board, the first inspection wiring line is provided along one of the two sides on the flexible printed circuit board, and the second inspection wiring line is provided along the other of the two sides on the flexible printed circuit board. ### Claim 7 (depends on 4) The display device according to claim 4, wherein the semiconductor integrated circuit has two sides extending in a lateral direction, the first inspection terminal is provided at a position close to one of the two sides, and the second inspection terminal is provided at a position close to the other of the two sides. ### Claim 8 (depends on 4) The display device according to claim 4, wherein the display panel is a liquid crystal panel. ### Claim 9 (depends on 4) The display device according to claim 4, wherein the film material is an anisotropic conductive film.