# US 12,004,412 B2 · Inkjet printing apparatus, dipole alignment method, and display device manufacturing method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,412 B2 - Document ID: US12004412B2 - Status: Granted - Kind: B2 - Application number: 17/278,126 - Filed: 2019-04-08 - Published: 2021-10-28 - Granted: 2024-06-04 - Earliest claimed: 2018-09-21 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., LTD. - Inventors: Heung Cheol Jeong; Byung Chul Lee; Myung Soo Huh; Jin Oh Kwag; Do Hun Lee - Web page: https://patentgrep.com/patent/US12004412B2 ## CPC - H10K 71/135: {using ink-jet printing} - B41J 2/045: by pressure, e.g. electromechanical transducers - B41J 2/135: Nozzles - B41J 2/45: using light-emitting diode {[LED] or laser} arrays - B41J 2202/09: Ink jet technology used for manufacturing optical filters - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS ## Abstract An inkjet printing apparatus, a dipole alignment method, and a display device manufacturing method are provided. The inkjet printing apparatus includes a stage, a print head part disposed above the stage, and an electric field generating part that provides an electric field to a space between the stage and the print head part. The dipole alignment method includes providing an electric field at an area above a target substrate, spraying ink including a dipole onto the target substrate through the area, and landing the dipole on the target substrate. The display device manufacturing method includes preparing a base layer on which first and second electrodes are disposed, spraying ink including a light emitting element onto the base layer through the area, landing the light emitting element between the first and second electrodes. ## Claims ### Claim 1 An inkjet printing apparatus comprising: a stage; a print head part disposed above the stage; and an electric field generating part that includes antenna parts and that provides an electric field oriented in a horizontal direction parallel to a main surface of the stage in a space between the stage and the print head part. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the antenna parts include at least two antenna parts each spaced apart from the print head part. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the antenna parts include at least two antenna parts each spaced apart from the stage. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the antenna parts include at least two antenna parts each spaced apart from an entire region directly between the print head part and the stage. ### Claim 5 An inkjet printing apparatus comprising: a stage; a print head part disposed above the stage, wherein the print head part comprises: a print head; and a nozzle that sprays ink including a dipole, the nozzle being extended to the print head; and an electric field generating part that provides an electric field to a space between the stage and the print head part. ### Claim 6 (depends on 5) The apparatus of claim 5, wherein the dipole comprises a light emitting element. ### Claim 7 (depends on 5) The apparatus of claim 5, wherein the electric field generating part comprises an antenna part which comprises an antenna pattern. ### Claim 8 (depends on 7) The apparatus of claim 7, wherein the antenna part is disposed at a side of the stage. ### Claim 9 (depends on 8) The apparatus of claim 8, wherein the antenna part generates a horizontal electric field in the space between the stage and the print head part. ### Claim 10 (depends on 7) The apparatus of claim 7, wherein the antenna part is disposed between the stage and the print head part. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the antenna part generates a vertical electric field in the space between the stage and the print head part. ### Claim 12 (depends on 10) The apparatus of claim 10, further comprising a substrate mounting member disposed on the antenna part, wherein the antenna part is disposed on the stage and is surrounded between the stage and the substrate mounting member. ### Claim 13 An inkjet printing apparatus comprising: a stage; a print head part disposed above the stage; an electric field generating part that provides an electric field to a space between the stage and the print head part; a probe part; and a probe driver driving the probe part. ### Claim 14 A dipole alignment method comprising: providing an electric field at an area above a target substrate; spraying ink onto the target substrate through the area, the ink including a dipole; and landing the dipole on the target substrate. ### Claim 15 (depends on 14) The method of claim 14, wherein the electric field is provided by an antenna part comprising an antenna pattern. ### Claim 16 (depends on 14) The method of claim 14, wherein the spraying of the ink comprises aligning an orientation direction of the dipole via the electric field. ### Claim 17 (depends on 14) The method of claim 14, wherein the target substrate comprises a first electrode and a second electrode, and the landing of the dipole comprises landing the dipole on the first electrode and the second electrode. ### Claim 18 (depends on 17) The method of claim 17, wherein the landing of the dipole comprises applying alternating current (AC) power to the first electrode and the second electrode. ### Claim 19 (depends on 14) The method of claim 14, wherein the spraying of the ink onto the target substrate is performed using an inkjet printing apparatus. ### Claim 20 (depends on 19) The method of claim 19, wherein the inkjet printing apparatus comprises: a stage; a print head part disposed above the stage; and an electric field generating part that provides an electric field to a space between the stage and the print head part. ### Claim 21 A display device manufacturing method comprising: preparing a base layer on which a first electrode and a second electrode are disposed; providing an electric field at an area above the base layer; spraying ink onto the base layer through the area, the ink including a light emitting element; and landing the light emitting element between the first electrode and the second electrode. ### Claim 22 (depends on 21) The method of claim 21, wherein the base layer comprises pixels, the first electrode and the second electrode are disposed in each of the pixels, and the light emitting element is landed between the first electrode and the second electrode in each of the pixels. ### Claim 23 (depends on 21) The method of claim 21, wherein the spraying of the ink further comprises aligning an orientation direction of the light emitting element via the electric field.