# US 11,114,500 B2 · Display device and method of manufacturing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,114,500 B2 - Document ID: US11114500B2 - Status: Granted - Kind: B2 - Application number: 16/560,359 - Filed: 2019-09-04 - Published: 2020-03-05 - Granted: 2021-09-07 - Earliest claimed: 2018-09-05 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Won Jun Lee; Hyo Chul Lee - Web page: https://patentgrep.com/patent/US11114500B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout} - H10D 86/441: {Interconnections, e.g. scanning lines} - H10D 86/60: wherein the TFTs are in active matrices - H10H 20/83: Electrodes - H10H 20/84: Coatings, e.g. passivation layers or antireflective coatings - H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls - H10W 90/00: Package configurations - G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED] - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/043: Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver - G09G 2300/0439: Pixel structures - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2310/0232: Special driving of display border areas - G09G 2310/0267: Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays - G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters - G09G 2320/0204: Compensation of DC component across the pixels in flat panels - G09G 2320/029: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel - G09G 2330/12: Test circuits or failure detection circuits included in a display system, as permanent part thereof - H10D 86/481: {integrated with passive devices, e.g. auxiliary capacitors} - H10H 20/819: characterised by their shape, e.g. curved or truncated substrates - 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) - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A display device includes a substrate including a display area having a plurality of pixel areas and a non-display area located around the display area; a circuit element layer including a circuit element in each of the pixel areas and a reference voltage wiring in the non-display area, the reference voltage wiring being electrically coupled to the circuit element; and a display element layer including a first pixel electrode on the circuit element layer in each of the pixel areas, a second pixel electrode located opposite to the first pixel electrode, a plurality of light emitting elements between the first pixel electrode and the second pixel electrode, and a first wiring on the circuit element layer in the non-display area, wherein the first wiring is directly coupled to the reference voltage wiring in the non-display area. ## Claims ### Claim 1 A display device comprising: a substrate comprising a display area having a plurality of pixel areas and a non-display area located around the display area; a circuit element layer comprising a circuit element in each of the pixel areas and a reference voltage wiring in the non-display area, the reference voltage wiring being electrically coupled to the circuit element; and a display element layer comprising a first pixel electrode on the circuit element layer in each of the pixel areas, a second pixel electrode located opposite to the first pixel electrode, a plurality of light emitting elements between the first pixel electrode and the second pixel electrode, and a first wiring on the circuit element layer in the non-display area, wherein the first wiring is directly coupled to the reference voltage wiring in the non-display area, wherein the first wiring comprises: a body portion that extends in a first direction; and a protruding portion that protrudes from the body portion in a second direction intersecting the first direction, and wherein the protruding portion overlaps the reference voltage wiring, and the first wiring is coupled to the reference voltage wiring by the protruding portion. ### Claim 2 (depends on 1) The display device of claim 1, wherein the display element layer is on the circuit element layer in the non-display area and further comprises a second wiring coupled to the second pixel electrode. ### Claim 3 (depends on 2) The display device of claim 2, wherein the reference voltage wiring comprises: a main wiring that extends in a first direction in the non-display area; and sub-wirings that extend in a second direction intersecting the first direction, that traverse the display area, and that are spaced apart from each other along the first direction, wherein the main wiring is directly coupled to the first wiring. ### Claim 4 (depends on 2) The display device of claim 2, wherein the first wiring is adjacent to a first side of the display area, the second wiring is adjacent to a second side opposite to the first side of the display area, and the reference voltage wiring is adjacent to the first side of the display area. ### Claim 5 (depends on 4) The display device of claim 4, wherein the first wiring overlaps the reference voltage wiring. ### Claim 6 (depends on 1) The display device of claim 1, wherein the first pixel electrode is located on an extension line of the protruding portion. ### Claim 7 (depends on 1) The display device of claim 1, wherein the first pixel electrode and the first wiring are formed by separating one common wiring. ### Claim 8 (depends on 1) The display device of claim 1, wherein the circuit element layer further comprises a first insulating layer, a second insulating layer, a third insulating layer, and a fourth insulating layer stacked sequentially between the substrate and the display element layer. ### Claim 9 (depends on 8) The display device of claim 8, wherein the reference voltage wiring comprises at least one selected from a first sub-wiring between the third insulating layer and the fourth insulating layer, a second sub-wiring between the second insulating layer and the third insulating layer, a third sub-wiring between the first insulating layer and the second insulating layer, and a fourth sub-wiring between the substrate and the first insulating layer. ### Claim 10 (depends on 8) The display device of claim 8, wherein the first wiring comprises: a first sub-wiring on the circuit element layer and directly coupled to the reference voltage wiring; and a second sub-wiring on the first sub-wiring, wherein the conductivity of the second sub-wiring is greater than that of the first sub-wiring. ### Claim 11 (depends on 1) The display device of claim 1, wherein the circuit element comprises a transistor, and the transistor comprises: a semiconductor pattern between the substrate and a first insulating layer; a gate electrode between the first insulating layer and a second insulating layer, the gate electrode overlapping the semiconductor pattern; and a first electrode between a third insulating layer and a fourth insulting layer, the first electrode being electrically coupled to the semiconductor pattern. ### Claim 12 (depends on 11) The display device of claim 11, wherein the first electrode of the transistor is coupled to the first pixel electrode, and a second electrode of the transistor is electrically coupled to the reference voltage wiring. ### Claim 13 (depends on 1) The display device of claim 1, wherein the first pixel electrode is on the same layer as the second pixel electrode and spaced apart from the second pixel electrode, a first end of each of the light emitting elements is electrically coupled to the first pixel electrode, and a second end of each of the light emitting elements is electrically coupled to the second pixel electrode. ### Claim 14 (depends on 13) The display device of claim 13, wherein the display element layer further comprises: first contact electrodes on the respective first ends of the light emitting elements, the first contact electrodes respectively coupling the light emitting elements to the first pixel electrode; and second contact electrodes on the respective second ends of the light emitting elements, the second contact electrodes respectively coupling the light emitting elements to the second pixel electrode. ### Claim 15 (depends on 13) The display device of claim 13, wherein each of the light emitting elements comprises: a first conductive semiconductor layer doped with a first conductive dopant; a second conductive semiconductor layer doped with a second conductive dopant; and an active layer between the first conductive semiconductor layer and the second conductive semiconductor layer. ### Claim 16 A display device comprising: a substrate comprising a display area having a plurality of pixel areas and a non-display area located around the display area; a circuit element layer comprising a circuit element in each of the pixel areas and a reference voltage wiring traversing the display area and electrically coupled to the circuit element; and a display element layer comprising a first pixel electrode on the circuit element layer in each of the pixel areas, a second pixel electrode located opposite to the first pixel electrode, a plurality of light emitting elements between the first pixel electrode and the second pixel electrode, and a first wiring on the circuit element layer in the non-display area, wherein the first wiring is directly coupled to the reference voltage wiring in the non-display area. ### Claim 17 (depends on 16) The display device of claim 16, wherein the reference voltage wiring extends in a first direction, and the first wiring extends in a second direction intersecting the first direction. ### Claim 18 (depends on 17) The display device of claim 17, wherein the first wiring comprises: a body portion that extends in the first direction; and a protruding portion that protrudes from the body portion in the second direction intersecting the first direction, wherein the protruding portion does not overlap the reference voltage wiring.