Display Device and Method of Manufacturing the Same

Patent metadata

Field	Value
Publication number	US-2023215852-A1
Application number	US-202218073398-A
Country	US
Kind code	A1
Filing date	Dec 1, 2022
Priority date	Dec 31, 2021
Publication date	Jul 6, 2023
Grant date	—

Abstract

Embodiments of the present disclosure relate to a display device and a method of manufacturing the same. More specifically, there may be provided includes a display device including an adhesive layer which includes a first portion and a second portion, wherein the first portion has higher adhesion than the second portion, and the second portion has lower adhesion than the first portion and includes high refractive particles so that a manufacturing process is simplified, and a method of manufacturing the same.

First claim

What is claimed is:

1 . A display device comprising:
a substrate; a thin film transistor layer positioned on the substrate; an adhesive layer disposed on the thin film transistor layer and including a first portion and a second portion; and a light-emitting element positioned on the adhesive layer and positioned on the first portion of the adhesive layer, wherein the first portion has higher adhesion than the second portion, and wherein the second portion has lower adhesion than the first portion and comprises high refractive particles.

2 . The display device of claim 1 , wherein the first portion has a tapered shape.

3 . The display device of claim 1 , wherein the second portion has a reverse tapered shape.

4 . The display device of claim 1 , wherein the adhesive layer comprises a binder and a photosensitizer.

5 . The display device of claim 1 , wherein the first portion comprises a photosensitive material that in adhesion when ultraviolet light is irradiated on the photosensitive material.

6 . The display device of claim 5 , wherein the photosensitive material is an azobenzene derivative.

7 . The display device of claim 1 , wherein the first portion comprises a portion that protrudes further than the second portion.

8 . The display device of claim 1 , wherein the second portion has a higher degree of curing than the first portion.

9 . The display device of claim 1 , wherein the light-emitting element is not positioned on the second portion.

10 . A method of manufacturing a display device, the method comprising:
irradiating ultraviolet light onto an adhesive layer which is positioned on a substrate and includes a first portion and a second portion including high refractive particles; and pressing a stamp having a surface, on which a light-emitting element is positioned, onto the adhesive layer onto which the ultraviolet light is irradiated to bond the light-emitting element to the first portion of the adhesive layer.

11 . The method of claim 10 , wherein the irradiating of the ultraviolet light comprises irradiating the ultraviolet light onto the first portion and the second portion.

12 . The method of claim 10 , wherein the irradiating of the ultraviolet light comprises enhancing adhesion of the first portion and weakening adhesion of the second portion.

13 . A display device comprising:
a substrate; one or more thin film transistors on the substrate; an adhesive layer disposed on the one or more thin film transistors, wherein the adhesive layer includes a binder and a photosensitizer, and wherein the adhesive layer comprises one or more first portions and one or more second portions disposed between the one or more first portions, a first portion including a first material and a second portion including a second material different from the first material; and one or more light-emitting elements disposed on the one or more first portions of the adhesive layer.

14 . The display device of claim 13 , wherein the one or more light-emitting elements are micro light-emitting diodes (LEDs).

15 . The display device of claim 13 , wherein the first material is a photosensitive material that increases adhesion when irradiated with ultraviolet (UV) light.

16 . The display device of claim 13 , wherein the first material is an azobenzene derivative compound.

17 . The display device of claim 13 , wherein the second material are high refractive particles including metal oxide particles.

18 . The display device of claim 17 , wherein the metal oxide particles are one or a combination of titanium oxide particles or iron oxide particles.

19 . The display device of claim 13 , wherein an upper surface of the first portion is at a first distance from the substrate and an upper surface of the second portion is at a second distance from the substrate shorter than the first distance.

20 . The display device of claim 13 , wherein a width of a bottom surface of the first portion is greater than a width of an upper surface of the first portion.

21 . The display device of claim 13 , wherein an adhesion of the first portion is higher than an adhesion of the second portion with respect to a probe tack test (gf) or a die shear test (gf/in 2 ).

Assignees

• Lg Display Co Ltd

Inventors

• Kim Byonghoo
• Lee Daeheung
• Kim Juhyuk
• Sohn Aram
• Lee Sumin

Classifications

• H10W72/30

  Die-attach connectors · CPC title

• H10W90/732

  between stacked chips · CPC title

• H10W72/01361

  Chemical or physical modification, e.g. by sintering or anodisation (patterning H10W72/01351) · CPC title

• H10W72/354

  comprising polymers · CPC title

• H10W72/334

  Cross-sectional shape, i.e. in side view · CPC title