Display device and manufacturing method for the same

Patent metadata

Field	Value
Publication number	US-11709396-B2
Application number	US-202117186452-A
Country	US
Kind code	B2
Filing date	Feb 26, 2021
Priority date	Jun 9, 2020
Publication date	Jul 25, 2023
Grant date	Jul 25, 2023

Abstract

A display device includes a light-emitting element layer and a light control layer. The light control layer may include a plurality of separated partition wall parts including a partition wall part, a color control part between the partition wall parts, the color control part including quantum dots and a first scattering particle, and a coating layer covering a side of the partition wall part adjacent to the color control part. The coating layer includes at least one selected from a substitution dispersant and a substitution scattering particle, and each of the substitution dispersant and the substitution scattering particle may include at least one substituent selected from an amine group and a carboxyl group. The amine groups and the carboxyl groups included in the coating layer may be different in number from each other.

First claim

What is claimed is:

1. A display device comprising:
a light-emitting element layer; and
a light control layer on the light-emitting element layer,
wherein the light control layer comprises:
a plurality of separated partition wall parts comprising a partition wall part;
a color control part between the partition wall parts, the color control part comprising quantum dots and a first scattering particle; and
a coating layer covering a side of the partition wall part adjacent to the color control part,
wherein the coating layer comprises at least one selected from a substitution dispersant and a substitution scattering particle, the substitution dispersant comprising at least one substituent selected from an amine group and a carboxyl group, the substitution scattering particle comprising at least one substituent selected from an amine group and a carboxyl group, and
wherein the amine groups and the carboxyl groups comprised in the coating layer are different in number from each other.

2. The display device of claim 1 , wherein the coating layer comprises the substitution dispersant and does not comprise the substitution scattering particle, and
wherein the coating layer comprises a second scattering particle that is different in substituent from the substitution scattering particle.

3. The display device of claim 2 , wherein the second scattering particle comprises at least one selected from TiO 2 , Ag, and Al.

4. The display device of claim 1 , wherein the substitution dispersant comprises a polymer resin substituted with at least one selected from the amine group and the carboxyl group.

5. The display device of claim 4 , wherein the polymer resin is at least one selected from polyurethane, polyethylene, polyacrylic, polyepoxy, and polyester resin.

6. The display device of claim 1 , wherein the coating layer does not comprise the substitution dispersant but comprises the substitution scattering particle.

7. The display device of claim 1 , wherein a surface of the first scattering particle is substituted with a ligand comprising at least one selected from an amine group and a carboxyl group, and
wherein the amine groups at the surface of the first scattering particle and the carboxyl groups at the surface of the first scattering particle are different in number from each other.

8. The display device of claim 1 , wherein the first scattering particle and the substitution scattering particle are the same.

9. The display device of claim 1 , wherein the coating layer further comprises a monomer, and
wherein the monomer is a urethane monomer, an ethylene monomer, an acrylic monomer, an epoxy monomer, or an ester monomer.

10. The display device of claim 1 , wherein the coating layer contacts the color control part.

11. The display device of claim 1 , wherein the partition wall part of the partition wall parts is separated from the color control part by the coating layer being between the partition wall part and the color control part.

12. A method for manufacturing a display device, the method comprising:
forming a color filter layer; and
forming a light control layer,
wherein the forming of the light control layer comprises:
forming a plurality of partition wall parts comprising a partition wall part;
providing a preliminary coating layer between the partition wall parts, the preliminary coating layer comprising at least one selected from a substitution dispersant and substitution scattering particles, the substitution dispersant comprising at least one substituent selected from an amine group and a carboxyl group, the substitution scattering particles comprising at least one substituent selected from an amine group and a carboxyl group;
forming a coating layer covering a side of the partition wall part by providing vacuum and heat to the preliminary coating layer; and
forming a color control part comprising quantum dots and first scattering particles between the partition wall parts on which the coating layer is formed, and

wherein the amine groups and the carboxyl groups comprised in the preliminary coating layer are different in number from each other.

13. The method for manufacturing the display device of claim 12 , wherein the preliminary coating layer further comprises a solvent, and the solvent is removed with the forming of the coating layer.

14. The method for manufacturing the display device of claim 13 , wherein the solvent comprises at least one selected from PGMEA, DMA, GBL, CHA, and DPMA.

15. The method for manufacturing the display device of claim 13 , wherein a boiling point of the solvent is from about 50° C. to about 250° C.

16. The method for manufacturing the display device of claim 12 , wherein the preliminary coating layer comprises the substitution dispersant and does not comprise the substitution scattering particles, and wherein the preliminary coating layer comprises second scattering particles that are different in substituent from the substitution scattering particles.

17. The method for manufacturing the display device of claim 16 , wherein the second scattering particles are greater than about 0 wt % to less than about 5 wt % based on a total weight of the preliminary coating layer.

18. The method for manufacturing the display device of claim 12 , wherein the preliminary coating layer does not comprise the substitution dispersant but comprises the substitution scattering particles.

19. The method for manufacturing the display device of claim 12 , wherein the preliminary coating layer further comprises a monomer, and
wherein the monomer is applied together with a thermal curing agent or a photocuring agent.

20. The method for manufacturing the display device of claim 19 , wherein the monomer is greater than about 0 wt % to less than about 5 wt % based on a total weight of the preliminary coating layer.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Soodong
• Kwon Youngsoo

Classifications

• G02F1/133606 Primary

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• H10K59/38 Primary

  comprising colour filters or colour changing media [CCM] · CPC title

• C09D4/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title

• C09D7/20

  Diluents or solvents · CPC title

• C09D7/61

  inorganic · CPC title