# US 2021/0280655 A1 · Display panel, method of manufacturing the same, and substrate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0280655 A1 - Document ID: US20210280655A1 - Status: Published application - Kind: A1 - Application number: 17/330,607 - Filed: 2021-05-26 - Published: 2021-09-09 - Earliest claimed: 2018-11-27 - Assignees: Japan Display Inc. - Applicants: Japan Display Inc. - Inventors: Yasuhiro KANAYA; Masanobu IKEDA - Web page: https://patentgrep.com/patent/US20210280655A1 ## CPC - H10K 59/124: Insulating layers formed between TFT elements and OLED elements - G09F 9/00: Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements (in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00) - G09F 9/30: in which the desired character or characters are formed by combining individual elements (panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00) - H10D 30/67: Thin-film transistors [TFT] {(Stacked nanowire, nanosheet or nanoribbon FETs H10D30/501)} - H10H 20/80: Constructional details - H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls - H10K 59/1213: {the pixel elements being TFTs} - H10K 59/131: Interconnections, e.g. wiring lines or terminals - H10K 59/80516: {combined with auxiliary electrodes, e.g. ITO layer combined with metal lines} - H10W 20/01: {Manufacture or treatment} - H10K 59/1201: {Manufacture or treatment} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract According to one embodiment, a display panel includes a substrate, a first insulating layer, and a plurality of pixels including sub-pixels of a plurality of colors, respectively. Each of the sub-pixels includes a drive transistor, a pixel electrode supplied with a signal having a current value controlled from the drive transistor, and a light emitting element mounted on the pixel electrode. Each of the pixels includes a mounting electrode located to be spaced apart from the pixel electrode. The mounting electrode is in an electrically floating state in a first pixel of the plurality of pixels. ## Claims ### Claim 1 A display panel comprising: a substrate; a first insulating layer provided on the substrate; and a plurality of pixels provided on the substrate, located in a display area, and including sub-pixels of a plurality of colors, respectively, each of the sub-pixels including: a drive transistor covered with the first insulating layer; a pixel electrode arranged on the first insulating layer, electrically connected to the drive transistor, and supplied with a signal having a current value controlled from the drive transistor; and a light emitting element mounted on the pixel electrode and including a first electrode electrically connected to the pixel electrode, each of the pixels including a mounting electrode arranged on the first insulating layer and located to be spaced apart from the pixel electrode, the mounting electrode being in an electrically floating state in a first pixel of the plurality of pixels. ### Claim 2 (depends on 1) The display panel of claim 1, wherein a second pixel of the plurality of pixels further includes an additional light emitting element of a first color mounted on the mounting electrode and including a first electrode electrically connected to the mounting electrode, and in the second pixel, the mounting electrode is electrically connected to the drive transistor of the sub-pixel of the first color and is supplied with a signal having the current value controlled from the drive transistor, and when the signal having the current value controlled is supplied from the drive transistor of the sub-pixel of the first color to the pixel electrode of the sub-pixel of the first color and the mounting electrode, the light emitting element of the first color of the sub-pixel of the first color does not emit light but the additional light emitting element of the first color emits light. ### Claim 3 (depends on 2) The display panel of claim 2, wherein the second pixel further includes a wiring layer located on the first insulating layer to connect the pixel electrode of the sub-pixel of the first color with the mounting electrode. ### Claim 4 (depends on 3) The display panel of claim 3, wherein the wiring layer is a metallized layer. ### Claim 5 (depends on 4) The display panel of claim 4, wherein the wiring layer is located between the additional light emitting element and the mounting electrode of the second pixel and, and the additional light emitting element is mounted on the wiring layer. ### Claim 6 (depends on 3) The display panel of claim 3, wherein the wiring layer is located between the additional light emitting element and the mounting electrode of the second pixel and, and the additional light emitting element is mounted on the wiring layer. ### Claim 7 (depends on 3) The display panel of claim 3, further comprising: a second insulating layer located on the plurality of pixel electrodes, the plurality of mounting electrodes, and the wiring layer, covering the plurality of pixel electrodes, the plurality of mounting electrodes, and the wiring layer, and exposing the plurality of light emitting elements and the additional light emitting element. ### Claim 8 (depends on 7) The display panel of claim 7, further comprising: a common electrode arranged on the second insulating layer, the plurality of light emitting elements, and the additional light emitting element, and shared by the plurality of sub-pixels, wherein each of the plurality of light emitting elements and the additional light emitting element includes a second electrode electrically connected to the common electrode. ### Claim 9 (depends on 8) The display panel of claim 8, wherein in the second pixel, a current does not flow between the pixel electrode of the sub-pixel of the first color and the common electrode via the light emitting element of the first color. ### Claim 10 (depends on 2) The display panel of claim 2, wherein each of the light emitting element and the additional light emitting element is a micro-light-emitting diode. ### Claim 11 A method of manufacturing a display panel, comprising: preparing a panel comprising a substrate, a first insulating layer provided on the substrate, and a plurality of pixels provided on the substrate, located in a display area, and including sub-pixels of a plurality of colors, respectively, each of the sub-pixels including a drive transistor covered with the first insulating layer, a pixel electrode arranged on the first insulating layer, electrically connected to the drive transistor, and supplied with a signal having a current value controlled from the drive transistor, and a light emitting element mounted on the pixel electrode and including a first electrode electrically connected to the pixel electrode, each of the pixels including a mounting electrode arranged on the first insulating layer and located to be spaced apart from the pixel electrode, the mounting electrode being in an electrically floating state; inspecting whether emission failure occurs in the plurality of light emitting elements or not, after preparing the panel; when it is determined that the emission failure does not occur in the plurality of light emitting elements of a first pixel, of the plurality of pixels, maintaining the mounting electrode of the first pixel an electrically floating state; and when the emission failure occurs in the light emitting element of a first color of the sub-pixel of the first color of a second pixel, of the plurality of pixels, irradiating the light emitting element of the first color of the second pixel with laser light, mounting an additional light emitting element of the first color on the mounting electrode of the second pixel and electrically connecting a first electrode of the additional light emitting element to the mounting electrode, and electrically connecting the mounting electrode to the drive transistor of the sub-pixel of the first color, in the second pixel. ### Claim 12 (depends on 11) The method of claim 11, wherein when the mounting electrode is electrically connected to the drive transistor of the sub-pixel of the first color, a wiring layer connecting the pixel electrode of the sub-pixel of the first color with the mounting electrode is formed on the first insulating layer, in the second pixel. ### Claim 13 (depends on 12) The method of claim 12, wherein when the wiring layer is formed, a metallized layer is formed by laser CVD. ### Claim 14 (depends on 13) The method of claim 13, wherein when the wiring layer is formed, the wiring layer is formed on the mounting electrode of the second pixel, after the wiring layer is formed, the additional light emitting element is mounted on the wiring layer, and the wiring layer is located between the additional light emitting element and the mounting electrode of the second pixel. ### Claim 15 (depends on 12) The method of claim 12, wherein when the wiring layer is formed, the wiring layer is formed on the mounting electrode of the second pixel, after the wiring layer is formed, the additional light emitting element is mounted on the wiring layer, and the wiring layer is located between the additional light emitting element and the mounting electrode of the second pixel. ### Claim 16 (depends on 12) The method of claim 12, wherein after the additional light emitting element is mounted and the wiring layer is formed, a second insulating layer located on the plurality of pixel electrodes, the plurality of mounting electrodes, and the wiring layer, covering the plurality of pixel electrodes, the plurality of mounting electrodes, and the wiring layer, and exposing the plurality of light emitting elements and the additional light emitting element, is further formed. ### Claim 17 (depends on 16) The method of claim 16, wherein a common electrode shared by the plurality of sub-pixels is formed on the second insulating layer, the plurality of light emitting elements, and the additional light emitting element, and the common electrode is electrically connected to a second electrode of each of the plurality of light emitting elements and the additional light emitting element. ### Claim 18 A substrate comprising in one pixel a first color micro-light-emitting diode, a second color micro-light-emitting diode, a third color micro-light-emitting diode, a first electrode on which the first color micro-light-emitting diode is mounted, a second electrode on which the second color micro-light-emitting diode is mounted, a third electrode on which the third color micro-light-emitting diode is mounted, and a fourth electrode, the first color micro-light-emitting diode, the second color micro-light-emitting diode, and the third color micro-light-emitting diode having different colors, the fourth electrode being in an electrically floating state. ### Claim 19 (depends on 18) The substrate of claim 18, wherein the fourth electrode is adjacent to the second electrode in a first direction and is adjacent to the first electrode in a second direction perpendicular to the first direction, and the third electrode is adjacent to the first electrode in the first direction and is adjacent to the second electrode in the second direction. ### Claim 20 (depends on 18) The substrate of claim 18, wherein the first electrode, the second electrode, and the third electrode are arranged in the first direction to be spaced apart, and the fourth electrode is opposed to at least one electrode of the first to third electrodes in the second direction perpendicular to the first direction. ### Claim 21 (depends on 18) The substrate of claim 18, further comprising: an inorganic insulating film covering the first to fourth electrodes, wherein the inorganic insulating film includes a first opening, a second opening, a third opening, and a fourth opening in the pixel, the first color micro-light-emitting diode is connected to the first electrode via the first opening, the second color micro-light-emitting diode is connected to the second electrode via the second opening, the third color micro-light-emitting diode is connected to the third electrode via the third opening, the fourth opening exposes the fourth electrode, and none of the first to third color micro-light-emitting diodes is connected to the fourth electrode.