Adhesive composition and display device comprising the same

Patent metadata

Field	Value
Publication number	US-12048182-B2
Application number	US-202117550641-A
Country	US
Kind code	B2
Filing date	Dec 14, 2021
Priority date	Dec 21, 2020
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

Provided is a display device. The display device includes a substrate including a plurality of pixels, an adhesive layer on the substrate, a light emitting diode on the adhesive layer, a planarization layer surrounding the light emitting diode, a connection electrode on the planarization layer, and a transparent protective layer on the connection electrode. At least one layer of the adhesive layer, the planarization layer, and the transparent protective layer includes a plurality of multi-shell structured particles. The multi-shell structured particles are included in the display device so that the adhesion and the adhesion holding power between the light emitting diode and the driving panel are improved to increase the product yield and improve the luminance of the light emitting diode, thereby providing a display device with low power consumption.

First claim

The invention claimed is:

1. A display device, comprising:
a substrate including a plurality of pixels;
an adhesive layer on the substrate;
a light emitting diode on the adhesive layer;
a planarization layer on the adhesive layer, the planarization layer surrounding the light emitting diode;
a connection electrode on the planarization layer; and
a transparent protective layer on the connection electrode,
wherein at least one layer of the adhesive layer, the planarization layer, or the transparent protective layer includes a plurality of multi-shell structured particles, wherein the multi-shell structured particle includes:
a center portion including a tackifier material;
a first outer portion including a molecular sieve and enclosing the center portion; and
a second outer portion including fullerene and enclosing the first outer portion.

2. The display device according to claim 1 , wherein the at least one layer of the adhesive layer, the planarization layer, or the transparent protective layer further includes a binder and a photosensitive material.

3. The display device according to claim 1 , wherein the planarization layer is a single layer covering at least a part of the light emitting diode, or a plurality of layers including a first planarization layer surrounding the light emitting diode and a second planarization layer on the first planarization layer, the second planarization layer covering at least a part of the light emitting diode.

4. The display device according to claim 1 , wherein a diameter of the light emitting diode is 100 μm or less.

5. The display device according to claim 1 , wherein the tackifier material includes a rosin-based resin or a terpene-based resin.

6. The display device according to claim 1 , wherein the molecular sieve has a plurality of pores, and a diameter of the pore is from 1.5 nm to 50 nm.

7. The display device according to claim 1 , wherein the molecular sieve is at least one selected from the group consisting of SBA-1(Santa Barbara Amorphous-1), SBA-3(Santa Barbara Amorphous-3), SBA-6(Santa Barbara Amorphous-6), SBA-15(Santa Barbara Amorphous-15), MCM-41(Mobil Composition of Matter-41), and MCM-48(Mobil Composition of Matter-48).

8. The display device according to claim 1 , wherein the first outer portion occupies from 50% to 90% of a total volume of the multi-shell structured particle.

9. The display device according to claim 1 , wherein a diameter of the fullerene is from 0.5 nm to 1 nm.

10. The display device according to claim 1 , wherein a diameter of the multi-shell structured particle is from 0.2 μm to 1.8 μm.

11. The display device according to claim 2 , wherein the binder includes an alkali developable binder or a silicon-based binder, and the photosensitive material includes an oxime-based compound or a benzophenone-based compound.

12. An adhesive composition, comprising:
a photosensitive material;
a binder; and
a plurality of multi-shell structured particles,
wherein each of plurality of the multi-shell structured particles includes:
a center portion including a tackifier material;
a first outer portion including a molecular sieve and enclosing the center portion; and
a second outer portion including fullerene and enclosing the first outer portion.

13. The adhesive composition according to claim 12 , wherein the tackifier material includes a rosin-based resin or a terpene-based resin.

14. The adhesive composition according to claim 12 , wherein the molecular sieve has a plurality of pores, wherein a diameter of the plurality of pores is from 1.5 nm to 50 nm.

15. The adhesive composition according to claim 12 , wherein a diameter of the fullerene is from 0.5 nm to 1 nm.

16. A method for forming a display device, comprising:
forming an adhesive layer on a substrate;
attaching a light emitting diode to the adhesive layer;
depositing a first planarization layer on the adhesive layer, the first planarization layer surrounding the light emitting diode;
depositing a second planarization layer on the first planarization and the light emitting diode;
forming a connection electrode on the second planarization layer; and
depositing a transparent protective layer on the connection electrode,
wherein at least one layer of the adhesive layer, the first planarization layer, the second planarization layer or the transparent protective layer includes a plurality of multi-shell structured particles, each of the plurality of multi-shell structured particles including:
a center portion including a tackifier material;
a first outer portion enclosing the center portion, the first outer portion including a molecular sieve; and
a second outer portion enclosing the first outer portion, the second outer portion including fullerene.

17. The method according to claim 16 , wherein the at least one layer of the adhesive layer, the first planarization layer, the second planarization layer, or the transparent protective layer further includes a binder and a photosensitive material.

18. The method according to claim 17 , wherein the binder includes an alkali developable binder or a silicon-based binder, and the photosensitive material includes an oxime-based compound or a benzophenone-based compound.

19. The method according to claim 17 , wherein forming the connection electrode comprises patterning the second planarization layer and the first planarization layer by photolithography.

20. The method according to claim 18 , wherein forming the adhesive layer comprises patterning the adhesive layer by photolithography.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Byonghoo
• Lee Daeheung
• Kim Juhyuk
• Shin Youngsub
• Sohn Aram
• Kim Sungjin

Classifications

• H10W90/00

  Package configurations · CPC title

• H10K50/8426 Primary

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• H10D86/40

  characterised by multiple TFTs · CPC title

• H10H20/854 Primary

  characterised by their material, e.g. epoxy or silicone resins · CPC title

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title