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EP-4156885-B1 - METHOD OF MANUFACTURING A DISPLAY APPARATUS

EP4156885B1EP 4156885 B1EP4156885 B1EP 4156885B1EP-4156885-B1

Inventors

  • LIM, TAEWOO
  • KIM, Moonsoon
  • KIM, JAESEUNG
  • SEO, Seunghui
  • CHOI, MOONKEUN
  • HAN, Sangbeom
  • HONG, KIPYO

Dates

Publication Date
20260513
Application Date
20220830

Claims (6)

  1. A method of manufacturing a display apparatus (1), the method comprising the steps of: discharging a first droplet including quantum dots (418) into a first opening (501) of a substrate; discharging a second droplet including quantum dots (428) into a second opening (502) of the substrate; and before, in-between or after discharging the first droplet and the second droplet, discharging a third droplet including scatterers (417, 427, 437) into the first opening (501), the second opening (502), and a third opening (503) of the substrate; characterized in that a discharge unit (700) comprises a first nozzle (710) and a second nozzle (720), wherein the discharging of the third droplet comprises discharging the third droplet from the first nozzle (710) of the discharge unit (700) into the first opening (501) and the second opening (502) of the substrate and discharging the third droplet from the second nozzle (720) of the discharge unit (700) into the third opening (503) of the substrate.
  2. The method of claim 1, wherein the first droplet and/or the second droplet is free of any scatterers (417, 427, 437).
  3. The method of claim 1 or 2, wherein the discharging of the third droplet comprises discharging different amounts of the third droplet into the first opening (501), the second opening (502), and the third opening (503), respectively, and/or wherein the discharging of the third droplet further comprises discharging the third droplet into the third opening (503) in an amount greater than an amount of the third droplet discharged into each of the first opening (501) and the second opening (502).
  4. The method of at least one of claims 1 to 3, wherein a plurality of first openings (501) is provided, wherein the discharging of the first droplet comprises: discharging the first droplet from the discharge unit (700) into the first opening (501) of a first area of the substrate while moving any one of the discharge unit (700) and the substrate in a first direction (X); after discharging the first droplet, moving any one of the discharge unit (700) and the substrate in a second direction (Y) intersecting the first direction (X); and after moving the any one of the discharge unit (700) and the substrate in the second direction (Y), discharging the first droplet from the discharge unit (700) into the first opening (501) of a second area of the substrate while moving any one of the discharge unit (700) and the substrate in the first direction (X).
  5. The method of claim 4; wherein the discharging of the first droplet into the first opening (501) of the first area comprises discharging the first droplet from the first nozzle (710) of the discharge unit (700) into the first opening (501) of the first area of the substrate, and the discharging of the first droplet into the first opening (501) of the second area comprises discharging the first droplet from the second nozzle (720) of the discharge unit (700) into the first opening (501) of the second area of the substrate.
  6. The method of at least one of claims 1 to 5, wherein by discharging the first to third droplets into the first to third openings (501, 502, 503) a first resin layer (415) is formed in the first opening (501), a second resin layer (425) is formed in the second opening (502), and a third resin layer (435) is formed in the third opening (503).

Description

The present invention refers to a method of manufacturing a display apparatus, and more particularly, with a reduced possibility of occurrence of defects in a manufacturing process. A display apparatus has a plurality of pixels. In the case of a full-color display apparatus, the plurality of pixels may emit light of different colors. To this end, at least some pixels of the display apparatus have a color conversion unit. Accordingly, light of a first color generated by a light emitting unit of some pixels is converted into light of a second color while passing through a corresponding color conversion unit and is emitted. US 2018/102449 A1 discloses a method of manufacturing a display apparatus with the features summarized in the preamble of claim 1. Further reference is made to US 2021/074770 A1, CN 112 614 957 A, US 2007/201056 A1, US 2021/280750 A1 and HAU-VEI HAN ET AL: "Resonant-enhanced full-color emission of quantum dot-based micro LED display technology", OPTICS EXPRESS, vol. 23, no. 25, 14 December 2015 (2015-12-14), page 32504, XP055388361, US, ISSN: 2161-2072, DOI: 10.1364/0E.23.032504. However, such a conventional display apparatus has a problem in that defects are highly likely to occur during a manufacturing process. One or more embodiments include a display apparatus with a reduced possibility of occurrence of defects in a manufacturing process. However, this is merely an example, and the scope of the invention is not limited thereto. Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments of the invention. The invention is defined by the features of claim 1. The dependent claims and the description provide preferred embodiments. According to the present invention, a method of manufacturing a display apparatus includes: discharging a first droplet including quantum dots into a first opening, that is at least one first opening, of a substrate; discharging a second droplet including quantum dots into a second opening, that is at least one second opening, of the substrate, and before or after discharging the first droplet and the second droplet, discharging a third droplet including scatterers into the first opening, the second opening, and a third opening, that is at least one third opening, of the substrate. According to an alternative embodiment, a third droplet including scatterers is discharged into the first opening, the second opening, and a third opening of the substrate in between discharging the first droplet and the second droplet, that is after discharging the first droplet into the (at least one) first opening and before discharging the second droplet into the (at least one) second opening. Scatterers may also be termed as scattering particles. According to the invention, the discharge unit includes a first nozzle and a second nozzle, the discharging of the third droplet includes discharging the third droplet from the first nozzle of the discharge unit into the first opening and the second opening of the substrate and discharging the third droplet from the second nozzle of the discharge unit into the third opening of the substrate. The term substrate may refer to any layer of display panel or display device. The openings may be for example formed in a bank or layer provided on or below an upper substrate of the display device or on a lower substrate of the display device. The bank or layer may be especially positioned over light emitting devices, such as OLEDs, of the display device. The first droplet and/or the second droplet may not include scatterers. That is, at least one or both of these droplets may be free of scatterers. The third droplets may not include quantum dots. That is, the third droplets may be free of quantum dots. The discharging of the third droplet may include discharging different amounts of the third droplet into the first opening, the second opening, and the third opening, respectively. The discharging of the third droplet may further include discharging the third droplet into the third opening in an amount greater than an amount of the third droplet discharged into each of the first opening and the second opening. The first opening may be provided in plurality, and the discharging of the first droplet may include: discharging the first droplet from a discharge unit into the first opening of a first area of the substrate while moving any one of the discharge unit and the substrate in a first direction; after discharging the first droplet, moving any one of the discharge unit and the substrate in a second direction intersecting the first direction; and after moving the any one of the discharge unit and the substrate in the second direction, discharging the first droplet from the discharge unit into the first opening of a second area of the substrate while moving any one of the discharge unit and the substrate in the first directio