# US 12,112,666 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 12,112,666 B2 - Document ID: US12112666B2 - Status: Granted - Kind: B2 - Application number: 18/228,244 - Filed: 2023-07-31 - Published: 2024-06-06 - Granted: 2024-10-08 - Earliest claimed: 2022-12-01 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., LTD. - Inventors: Hae-Yeon Lee; Sukyoung Kim; Hwayoung Song; Kwangsae Lee; Il-Joo Kim - Web page: https://patentgrep.com/patent/US12112666B2 ## CPC - G09G 3/006: {Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309)} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/04164: {Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads} - G06F 3/0443: {using a single layer of sensing electrodes} - G09G 3/035: {for flexible display surfaces} - H10K 59/131: Interconnections, e.g. wiring lines or terminals - H10K 59/40: OLEDs integrated with touch screens - G06F 2203/04102: Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper - G06F 2203/04111: Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate - G09G 2300/0408: Integration of the drivers onto the display substrate - G09G 2300/0426: Layout of electrodes and connections - G09G 2330/12: Test circuits or failure detection circuits included in a display system, as permanent part thereof - G09G 2354/00: Aspects of interface with display user - H10K 2102/311: {Flexible OLED} - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A display device includes: a substrate including a display area, a peripheral area surrounding the display area, a hole area positioned inside the display area, and a pad area; a crack detection line including a first part in the pad area and extending to the peripheral area and a second part connected to the first part, disposed to surround the hole area, and extending to the pad area; a printed circuit board in the pad area; first transistors in the pad area and connected in series between the printed circuit board and the first part, where each of gate electrodes of the first transistors is connected to a first signal line; and second transistors in the pad area and connected in series between a constant voltage line and the first part, where each of gate electrodes of the second transistors is connected to a second signal line. ## Claims ### Claim 1 A display device comprising: a substrate comprising a display area on which a plurality of pixels are disposed, a peripheral area surrounding the display area, a hole area positioned inside the display area, a pad area, and a bending area positioned between the peripheral area and the pad area in a plan view; a crack detection line comprising a first part disposed on the substrate in the pad area and extending to the bending area and the peripheral area and a second part connected to the first part, disposed to surround the hole area, and extending to the peripheral area, the bending area and the pad area; a printed circuit board disposed on the substrate in the pad area; a plurality of first transistors disposed on the substrate in the pad area and connected in series between the printed circuit board and the first part of the crack detection line, wherein each of gate electrodes of the first transistors is connected to a first signal line to receive a first signal; and a plurality of second transistors disposed on the substrate in the pad area and connected in series between a constant voltage line for applying a constant voltage and the first part of the crack detection line, wherein each of gate electrodes of the second transistors is connected to a second signal line to receive a second signal. ### Claim 2 (depends on 1) The display device of claim 1, further comprising: a driving chip disposed on the substrate in the pad area, wherein the driving chip is connected to each of the first signal line and the second signal line, configured to provide the first signal to the first signal line, and configured to provide the second signal to the second signal line. ### Claim 3 (depends on 1) The display device of claim 1, wherein when the display device is driven in an inspection mode, the first signal having a high level is applied to each of the gate electrodes of the first transistors through the first signal line such that each of the first transistors is turned off, and the second signal having a low level is applied to each of the gate electrodes of the second transistors through the second signal line such that each of the second transistors is turned on. ### Claim 4 (depends on 3) The display device of claim 3, wherein when the display device is driven in the inspection mode, the constant voltage is applied to the first part of the crack detection line through the constant voltage line. ### Claim 5 (depends on 1) The display device of claim 1, wherein when the display device is driven in a normal mode, the first signal having a low level is applied to each of the gate electrodes of the first transistors through the first signal line such that each of the first transistors is turned on, and the second signal having a high level is applied to each of the gate electrodes of the second transistors through the second signal line such that each of the second transistors is turned off. ### Claim 6 (depends on 5) The display device of claim 5, wherein the first transistors are connected to a ground of the printed circuit board and when the display device is driven in the normal mode, a ground voltage is applied to the first part of the crack detection line through the printed circuit board. ### Claim 7 (depends on 1) The display device of claim 1, further comprising: a semiconductor element comprising an active layer disposed on the substrate in the display area, a gate electrode overlapping a channel area of the active layer in the plan view, a source electrode connected to a source area of the active layer, and a drain electrode connected to a drain area of the active layer; a connection electrode disposed on the semiconductor element and connected to the semiconductor element; and a touch sensing structure comprising a sensing connection pattern disposed on the semiconductor element and a sensing electrode pattern disposed on the sensing connection pattern. ### Claim 8 (depends on 7) The display device of claim 7, wherein the crack detection line comprises: a first conductive pattern disposed on the substrate in the pad area; a second conductive pattern disposed on the substrate in the bending area, extending to a part of the peripheral area and a part of the pad area, and connected to the first conductive pattern; and a touch conductive pattern disposed on the substrate in the peripheral area and connected to the second conductive pattern. ### Claim 9 (depends on 8) The display device of claim 8, wherein the first conductive pattern is disposed in a same layer as the source electrode and the drain electrode, the second conductive pattern is disposed in a same layer as the connection electrode, and the touch conductive pattern is disposed in a same layer as the sensing electrode pattern. ### Claim 10 A display device comprising: a substrate comprising a display area on which a plurality of pixels are disposed, a peripheral area surrounding the display area, a hole area positioned inside the display area, a pad area, and a bending area positioned between the peripheral area and the pad area in a plan view; a crack detection line comprising a first part disposed on the substrate in the pad area and extending to the bending area and the peripheral area and a second part connected to the first part, disposed to surround the hole area, and extending to the peripheral area, the bending area and the pad area; a printed circuit board disposed on the substrate in the pad area; a first transistor disposed on the substrate in the pad area, wherein a gate electrode of the first transistor is connected to a signal line to receive a signal, a first electrode of the first transistor is connected to the printed circuit board, and a second electrode of the first transistor is connected to the first part of the crack detection line; and a second transistor disposed on the substrate in the pad area, wherein a gate electrode of the second transistor is connected to the signal line to receive the signal, a first electrode of the second transistor is connected to a constant voltage line for applying a constant voltage, and a second electrode of the second transistor is connected to the first part of the crack detection line. ### Claim 11 (depends on 10) The display device of claim 10, further comprising: a driving chip disposed on the substrate in the pad area, wherein the driving chip is connected to the signal line and configured to provide the signal to the signal line. ### Claim 12 (depends on 11) The display device of claim 11, wherein the gate electrode of the first transistor and the gate electrode of the second transistor are connected to each other. ### Claim 13 (depends on 12) The display device of claim 12, wherein the first transistor comprises a (1-1)-th transistor and a (1-2)-th transistor, the (1-1)-th transistor and the (1-2)-th transistor are connected in series with each other, the second transistor comprises a (2-1)-th transistor and a (2-2)-th transistor, and the (2-1)-th transistor and the (2-2)-th transistor are connected in series with each other. ### Claim 14 (depends on 12) The display device of claim 12, wherein when the display device is driven in an inspection mode, the signal having a low level is applied to the gate electrode of the first transistor through the signal line such that the first transistor is turned off, and the signal having the low level is applied to the gate electrode of the second transistor through the signal line such that the second transistor is turned on. ### Claim 15 (depends on 14) The display device of claim 14, wherein when the display device is driven in the inspection mode, the constant voltage is applied to the first part of the crack detection line through the constant voltage line. ### Claim 16 (depends on 12) The display device of claim 12, wherein when the display device is driven in a normal mode, the signal having a high level is applied to the gate electrode of the first transistor through the signal line such that the first transistor is turned on, and the signal having the high level is applied to the gate electrode of the second transistor through the signal line such that the second transistor is turned off. ### Claim 17 (depends on 16) The display device of claim 16, wherein the first electrode of the first transistor is connected to a ground of the printed circuit board and when the display device is driven in the normal mode, a ground voltage is applied to the first part of the crack detection line through the printed circuit board. ### Claim 18 A display device comprising: a substrate comprising a display area on which a plurality of pixels are disposed, a peripheral area surrounding the display area, a hole area positioned inside the display area, a pad area, and a bending area positioned between the peripheral area and the pad area in a plan view; a crack detection line comprising a first part disposed on the substrate in the pad area and extending to the bending area and the peripheral area and a second part connected to the first part, disposed to surround the hole area, and extending to the peripheral area, the bending area and the pad area; a driving chip disposed on the substrate in the pad area and connected to a signal line to provide a signal to the signal line; and a plurality of transistors disposed on the substrate in the pad area and connected in series between a constant voltage line for applying a constant voltage and the first part of the crack detection line, wherein each of gate electrodes of the transistors is connected to the signal line to receive the signal. ### Claim 19 (depends on 18) The display device of claim 18, wherein when the display device is driven in an inspection mode, the signal having a low level is applied to each of the gate electrodes of the transistors through the signal line such that each of the transistors is turned on, and the constant voltage is applied to the first part of the crack detection line through the constant voltage line. ### Claim 20 (depends on 18) The display device of claim 18, wherein when the display device is driven in a normal mode, the signal having a high level is applied to each of the gate electrodes of the transistors through the signal line such that each of the transistors is turned off, and the crack detection line is in a floating state.