Display device

Patent metadata

Field	Value
Publication number	US-11730037-B2
Application number	US-202117225373-A
Country	US
Kind code	B2
Filing date	Apr 8, 2021
Priority date	Jun 12, 2020
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

A display device includes a display panel, a wavelength control layer disposed on the display panel, a light control member disposed on the wavelength control layer, and a cover layer disposed on the light control member. The light control member includes an inorganic layer disposed on the wavelength control layer and having a first refractive index, a first light control layer disposed on the inorganic layer and having a second refractive index, a second light control layer disposed on the first light control layer and having a third refractive index, and a color filter layer disposed on the second light control layer. The first refractive index is greater than the second refractive index and is less than a refractive index of the wavelength control layer, and the third refractive index is greater than the second refractive index and is less than a refractive index of the color filter layer.

First claim

What is claimed is:

1. A display device comprising:
a display panel;
a wavelength control layer disposed on the display panel;
a light control member disposed on the wavelength control layer; and
a cover layer disposed on the light control member,
wherein the light control member comprises:
an inorganic layer disposed on the wavelength control layer and having a first refractive index;
a first light control layer disposed on the inorganic layer and having a second refractive index;
a second light control layer disposed on the first light control layer and having a third refractive index; and
a color filter layer disposed on the second light control layer,

wherein the first refractive index is greater than the second refractive index and is less than a refractive index of the wavelength control layer,
wherein the third refractive index is greater than the second refractive index and is less than a refractive index of the color filter layer.

2. The display device of claim 1 , wherein each of the first refractive index and the third refractive index is in a range of about 1.4 to about 1.5.

3. The display device of claim 1 , wherein a thickness of the inorganic layer is in a range of about 2.5 kÅ to about 3.5 kÅ.

4. The display device of claim 1 , wherein a thickness of the second light control layer is in a range of about 0.5 kÅ to about 1.5 kÅ and about 2.5 kÅ to about 3.5 kÅ.

5. The display device of claim 1 , wherein the second light control layer comprises an inorganic film or an organic film.

6. The display device of claim 5 , wherein the second light control layer comprises an optically transparent organic film.

7. The display device of claim 5 , wherein the second light control layer comprises an organic film, in which a light transmittance in a yellow light wavelength range is less than a light transmittance in a blue light wavelength range.

8. The display device of claim 1 , wherein the second refractive index is about 1.3 or less.

9. The display device of claim 1 , wherein
the display panel includes a pixel area and a peripheral area adjacent to the pixel area, and
the display panel comprises a light emitting element which generates first light and is disposed in the pixel area,
wherein the wavelength control layer comprises:
a partition part in which a plurality of opening parts are defined;
a first wavelength control unit disposed on one of the opening parts, wherein the first wavelength control unit converts the first light into a second light; and
a second wavelength control unit disposed on another of the opening parts, wherein the second wavelength control unit converts the first light to a third light,

wherein the color filter layer comprises:
a first color filter part overlapping the first wavelength control unit, wherein the first color filter part transmits the second light; and
a second color filter part overlapping the second wavelength control unit, wherein the second color filter part transmits the third light.

10. The display device of claim 9 , wherein a portion of the first color filter part and a portion of the second color filter part overlap the partition part.

11. The display device of claim 9 , wherein
the wavelength control layer further comprises a transmission part disposed in an opening part, in which the first wavelength control unit and the second wavelength control unit are not disposed among the opening parts, wherein the transmission part transmits the first light.

12. The display device of claim 11 ,
wherein the second light control layer overlaps the transmission part,
wherein a portion of the second light control layer overlapping the transmission part directly contacts the cover layer.

13. The display device of claim 11 ,
wherein the first wavelength control unit and the second wavelength control unit comprise a quantum dot,
wherein the transmission part comprises a scatterer.

14. The display device of claim 13 , wherein the transmission part further comprises a colorant which transmits the first light and absorbs the second light and the third light.

15. The display device of claim 11 , wherein a thickness of the transmission part is greater than a thickness of the first wavelength control unit and a thickness of the second wavelength control unit.

16. The display device of claim 9 , wherein the light emitting element is an organic light emitting diode element, a micro light emitting diode element or a nano light emitting diode element.

17. A display device comprising:
a light emitting element layer which outputs a first light;
a wavelength control layer disposed on the light emitting element layer; and
a light control member disposed on the wavelength control layer,
wherein the light control member comprises:
an inorganic layer disposed on the wavelength control layer;
a first light control layer disposed on the inorganic layer; and
a color filter layer disposed on the first light control layer,
wherein a thickness of the inorganic layer is in a range of about 2.5 kÅ to about 3.5 kÅ.

18. The display device of claim 17 ,
wherein the light control member further comprises a second light control layer between the first light control layer and the color filter layer,
wherein each of a refractive index of the inorganic layer and a refractive index of the second light control layer is in a range of about 1.4 to about 1.5.

19. The display device of claim 18 , wherein a thickness of the second light control layer is in a range of about 0.5 kÅ to about 1.5 kÅ and about 2.5 kÅ to about 3.5 kÅ.

20. The display device of claim 17 , wherein the wavelength control layer comprises:
a first wavelength control unit including a first quantum dot which converts the first light into red light;
a second wavelength control unit including a second quantum dot which converts the first light into green light; and
a transmission part including a blue colorant and a scatterer,
wherein the color filter layer comprises:
a first color filter part overlapping the first wavelength control unit, wherein the first color filter part transmits the red light; and
a second color filter part overlapping the second wavelength control unit, wherein the second color filter part transmits the green light.

Assignees

• Samsung Display Co Ltd

Inventors

• Yoon Seon-Tae
• Kwon Junghyun
• Kim Hyojoon
• Ryu Yunha
• Park Kisoo
• Lee Hyeseung

Classifications

• H10W90/00

  Package configurations · CPC title

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• H10K59/879

  comprising refractive means, e.g. lenses · CPC title

• H10K59/877

  comprising scattering means · CPC title

• H10K59/875

  Arrangements for extracting light from the devices · CPC title