Transfer apparatus and method of manufacturing display apparatus using the same

• US 10,672,753 B2
• Filed: 01/21/2019
• Issued: 06/02/2020
• Est. Priority Date: 02/22/2016
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Oh, Hyunjoon
• Primary Examiner(s): Menz, Laura M
• Application Number:
  US16/252,865
• Publication Number:
  US 20190157255A1
• Time in Patent Office: 498 Days
• CPC Class Codes: B32B 2457/20 Displays, e.g. liquid crystal displays, plasma displays
• CPC Class Codes: B32B 37/025 Transfer laminating
• CPC Class Codes: H01L 21/6835 using temporarily an auxiliary support
• CPC Class Codes: H01L 2221/68354 used to support diced chips prior to mounting
• CPC Class Codes: H01L 2221/68368 used in a transfer process involving at least two transfer steps, i.e. including an intermediate handle substrate
• CPC Class Codes: H01L 2221/68381 Details of chemical or physical process used for separating the auxiliary support from a device or wafer
• CPC Class Codes: H01L 25/167 comprising optoelectronic devices, e.g. LED, photodiodes
• CPC Class Codes: H01L 25/50 Multistep manufacturing processes of assemblies consisting of devices, each device being of a type provided for in group H01L27/00 or H01L29/00 H01L21/50 takes precedence
• CPC Class Codes: H01L 27/1218 with a particular composition or structure of the substrate
• CPC Class Codes: H01L 27/1248 with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
• CPC Class Codes: H01L 2933/0033 relating to semiconductor body packages
• CPC Class Codes: H01L 2933/0066 relating to arrangements for conducting electric current to or from the semiconductor body
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

A transfer apparatus includes: a body portion; and an adhesive portion connected to the body portion, with which a point light source of a display apparatus is attachable to and detachable from the transfer apparatus by contact therewith. The adhesive portion is defined by a plurality of surfaces in different planes from each other.

Claims

1. A method of transferring a point light source, the method comprising:

providing a transfer apparatus including an adhesive portion having a plurality of surfaces in different planes from each other;

transferring a plurality of point light sources respectively to the plurality of surfaces of the adhesive portion which are in the different planes from each other, at a same time;

and

separating the plurality of point light sources which are respectively transferred to the plurality of surfaces of the adhesive portion from the transfer apparatus, at a same time, to transfer the plurality of point light sources to a surface of the display substrate.

2. The method of claim 1, wherein an original shape formed by the plurality of surfaces of the adhesive portion corresponds to a shape of the surface of the display substrate to which the plurality of point light sources are transferred.

3. The method of claim 1, wherein a height of the surface of the display substrate to which the plurality of point light sources are transferred discontinuously changes corresponding to the plurality of surfaces of the adhesive portion which are in the different planes from each other.

4. The method of claim 1, wherein the transfer apparatus comprises an elastomer.

7. The method of claim 1, wherein the transferring the plurality of point light sources comprises:

providing the plurality of point light sources on a single planar surface of a carrier substrate from which the plurality of point light sources are transferable to the adhesive portion;

positioning the adhesive portion having the plurality of surfaces in different planes from each other facing the carrier substrate with the plurality of point light sources therebetween; and

applying pressure to the transfer apparatus to respectively adhere the plurality of point light sources on the single planar surface of the carrier substrate to the plurality of surfaces in different planes from each other of the adhesive portion, at the same time.

8. The method of claim 7, wherein the separating the plurality of point light sources comprises separating the plurality of point light sources from the single planar surface of the carrier substrate, at the same time.

9. The method of claim 1, wherein transfer of the plurality of point light sources to the surface of the display substrate comprises:

positioning the adhesive portion having the plurality of point light sources respectively adhered to the plurality of surfaces thereof, on the display substrate of the display apparatus, and

applying pressure to the transfer apparatus to contact each of the plurality of point light sources to the surface of the display substrate, at a same time.

10. The method of claim 7, wherein when the pressure is applied to the transfer apparatus, the plurality of surfaces of the adhesive portion which are in the different planes from each other are changed into a single planar surface of the adhesive portion.

5. A display apparatus comprising:

a first light-emitting diode and a second light-emitting diode having different heights; and

a display substrate having first and second pixel regions, and comprising, in the first pixel region, a first thin-film transistor and a first electrode configured to connect the first light-emitting diode and the first thin-film transistor and, in the second pixel region, a second thin-film transistor and a second electrode configured to connect the second light-emitting diode and the second thin-film transistor,

wherein heights of the pixel first region and the second pixel region are different from each other to respectively correspond to the first light-emitting diode and the second light-emitting diode.

6. The display apparatus of claim 5, wherein a thickness of the display substrate discontinuously changes.