Adsorption device, method for making same, and transferring system having same

{
  "publication_number": "US11498779B2",
  "country": "US",
  "kind": "B2",
  "title": "Adsorption device, method for making same, and transferring system having same",
  "abstract": "A device to attract and hold microscopic items such as micro LEDs magnetically rather than by static electricity includes a substrate and a plurality of magnetic units on a surface of the substrate. The magnetic units are spaced apart from each other and are constrained in the size and direction of their individual magnetic fields. Each of the magnetic units includes a magnet and a cladding layer partially covering the magnet. The cladding layer is made of a magnetic material. A side of the magnet away from the substrate is exposed from the cladding layer to attract and hold one micro LED.",
  "claims": [
    "1. An adsorption device, comprising: a substrate; and a plurality of magnetic units on a surface of the substrate, the plurality of magnetic units being spaced apart from each other; wherein each of the plurality of magnetic units comprises a magnet and a cladding layer partially covering the magnet; the cladding layer is made of a magnetic material; and a side of the magnet away from the substrate is exposed from the cladding layer.",
    "2. The adsorption device of claim 1, wherein the cladding layer defines a through hole; the though hole extends through the cladding layer; the through hole comprises a first opening and a second opening opposite to the first opening; the magnet is in the through hole; the substrate covers one of the first opening and the second opening.",
    "3. The adsorption device of claim 2, wherein an inner diameter of the through hole gradually decreases from the first opening to the second opening; the substrate covers the first opening.",
    "4. The adsorption device of claim 3, wherein an outer diameter of the magnet gradually decreases in a direction from the first opening to the second opening to fit the through hole.",
    "5. The adsorption device of claim 2, wherein an inner diameter of the through hole is constant from the first opening to the second opening.",
    "6. The adsorption device of claim 2, wherein the magnet comprises a magnetic pole S and a magnetic pole N, one of the magnetic pole S and the magnetic pole N is closer to the first opening, and other of the magnetic pole S and the magnetic pole N is closer to the second opening.",
    "7. The adsorption device of claim 1, wherein the cladding layer is made of one or more selected from a group consisted of iron, cobalt, and nickel.",
    "8. The adsorption device of claim 1, wherein the cladding layer and the substrate are made of a same material.",
    "9. The adsorption device of claim 1, wherein the surface of the substrate defines a plurality of recesses spaced apart from each other; each of the plurality of magnetic units is located in one of the plurality of recesses.",
    "10. A transferring system, comprising: a target substrate, a plurality of anisotropic conductive adhesive being placed on the target substrate; and an adsorption device, the adsorption device comprising: a substrate; and a plurality of magnetic units on a surface of the substrate, the plurality of magnetic units being spaced apart from each other; wherein each of the plurality of magnetic units comprises a magnet and a cladding layer partially covering the magnet; the cladding layer is made of a magnetic material; and a side of the magnet away from the substrate is exposed from the cladding layer.",
    "11. The transferring system of claim 10, wherein the cladding layer defines a through hole; the though hole extends through the cladding layer; the through hole comprises a first opening and a second opening opposite to the first opening; the magnet is in the through hole; the substrate covers one of the first opening and the second opening.",
    "12. The transferring system of claim 11, wherein an inner diameter of the through hole gradually decreases from the first opening to the second opening; the substrate covers the first opening.",
    "13. The transferring system of claim 12, wherein an outer diameter of the magnet gradually decreases in a direction from the first opening to the second opening to fit the through hole.",
    "14. The transferring system of claim 11, wherein an inner diameter of the through hole is constant from the first opening to the second opening.",
    "15. The transferring system of claim 11, wherein the magnet comprises a magnetic pole S and a magnetic pole N, one of the magnetic pole S and the magnetic pole N is closer to the first opening, and other of the magnetic pole S and the magnetic pole N is closer to the second opening.",
    "16. The transferring system of claim 10, wherein the cladding layer is made of one or more selected from a group consisted of iron, cobalt, and nickel.",
    "17. The transferring system of claim 10, wherein the cladding layer and the substrate are made of a same material.",
    "18. A method for making an adsorption device, comprising: providing a plurality of magnets and a plurality of cladding layers, each of the plurality of cladding layers defining a through hole; positioning one of the plurality of the magnets into the through hole of each of the plurality of cladding layers; and providing a substrate and fixing the plurality of magnets and the plurality of cladding layers on a surface of the substrate."
  ],
  "description_excerpt": "The subject matter herein generally relates to a field of manufacturing display panels, and particularly relates to an adsorption device, a method for making the adsorption device, and a transferring system having the adsorption device.\n\nIn a manufacturing process of a micro light emitting diode (LED) display device, a large number of LEDs are transferred to a substrate having a circuit. A known method of transferring is to adopt electrostatic attraction, that is, the LEDs to be transferred are held to a transferring substrate by static electricity, then the transferring substrate with the LEDs is moved above the substrate, and the static electricity is removed to make the LEDs drop onto the substrate. However, the electrostatic charge may damage the circuit on the substrate. Therefore, there is room for improvement in the art.\n\nImplementations of the present technology will now be described, by way of embodiments only, with reference to the attached figures. FIG. 1 is a cross-sectional view of an adsorption device according to an embodiment of the present disclosure. FIG. 2 is a cross-sectional view of a magnetic unit in the adsorption device of FIG. 1. FIG. 3 is a cross-sectional view of a magnetic unit according to a modified embodiment of the present disclosure. FIG. 4 is a cross-sectional view of an adsorption device according to another embodiment of the present disclosure. FIG. 5 is a flowchart showing a method for making the adsorption device. FIG. 6 is a cross-sectional view illustrating a step S 2 of the method for making the adsorption device in FIG. 5. FIG.",
  "cpc": [
    "B65G 47/92",
    "H01F 7/0247",
    "H01F 7/0257",
    "H01L 21/67709",
    "H01L 2224/75735",
    "H01L 2224/76735",
    "H01L 2224/77735",
    "H01L 2224/79735",
    "H01L 24/75",
    "H10H 20/01",
    "H10H 20/036",
    "H10H 20/85",
    "H10H 20/857",
    "H10H 29/142",
    "H10P 72/0446",
    "H10P 72/3204",
    "H10P 72/70",
    "H10W 72/0198",
    "H10W 72/0711",
    "H10W 72/07178",
    "H10W 72/073",
    "H10W 72/07338",
    "H10W 72/074",
    "H10W 72/325",
    "H10W 72/354",
    "H10W 90/00"
  ],
  "ipc": [
    "B65G 47/92",
    "H01L 21/677",
    "H01L 23/00"
  ],
  "assignees": [
    "CENTURY TECH SHENZHEN CORPORATION LIMITED"
  ],
  "inventors": [
    "CHEN PO-LIANG",
    "LIN YUNG-FU",
    "TANAKA HIROHISA",
    "SHIMADA YASUNORI"
  ],
  "filing_date": "2019-08-21",
  "publication_date": "2022-11-15",
  "grant_date": "2022-11-15",
  "priority_date": "2019-07-05",
  "application_number": "US-201916546591-A",
  "family_id": "68360465",
  "citations": [
    "CN106957798A",
    "CN109378370A",
    "TW368048U",
    "US2018096977A1",
    "US2021005488A1",
    "WO2019081045A1"
  ]
}