Electroluminescent display device

Patent metadata

Field	Value
Publication number	US-10700140-B2
Application number	US-201816210375-A
Country	US
Kind code	B2
Filing date	Dec 5, 2018
Priority date	Dec 5, 2017
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

An electroluminescent display device is disclosed. The disclosed electroluminescent display device includes a substrate including a plurality of pixel regions; a plurality of light emitting diodes spaced apart from each other on the substrate and each corresponding to the plurality of pixel regions, respectively; a plurality of encapsulation films respectively covering each of the light emitting diodes of the plurality of light emitting diodes, wherein the plurality of encapsulation films has a first refractive index; a first partition wall disposed between each of the encapsulation films of the plurality of encapsulation films, wherein the first partition wall corresponds to a boundary between the plurality of pixel regions and has a second refractive index lower than the first refractive index; and a color filter layer disposed on the plurality of encapsulation films and the first partition wall.

First claim

What is claimed is:

1. An electroluminescent display device comprising:
a substrate including a plurality of pixel regions;
a plurality of light emitting diodes spaced apart from each other on the substrate and each corresponding to the plurality of pixel regions, respectively;
a plurality of encapsulation films respectively covering each of the light emitting diodes of the plurality of light emitting diodes, wherein the plurality of encapsulation films has a first refractive index;
a first partition wall disposed between each of the encapsulation films of the plurality of encapsulation films, wherein the first partition wall corresponds to a boundary between the plurality of pixel regions and has a second refractive index lower than the first refractive index; and
a color filter layer disposed on the plurality of encapsulation films and the first partition wall,
wherein the color filter layer includes a plurality of color filter patterns having a third refractive index and the color filter layer further includes a second partition wall disposed between each of the plurality of color filter patterns, and
wherein the second partition wall has a fourth refractive index lower than the third refractive index.

2. The electroluminescent display device of claim 1 , wherein the second partition wall is disposed corresponding to the first partition wall.

3. The electroluminescent display device of claim 2 , wherein the second partition wall is parallel to the first partition wall in a direction perpendicular to the substrate.

4. The electroluminescent display device of claim 1 , wherein each of the plurality of color filter patterns is disposed to correspond to each of the plurality of light emitting diodes, respectively.

5. The electroluminescent display device of claim 1 , wherein a middle portion of each of the first partition wall and the second partition wall has a bar shape and an upper portion of each of the first partition wall and the second partition wall has a width that progressively increases in an upward direction.

6. The electroluminescent display device of claim 5 , wherein a width of the middle portion of each of the first partition wall and the second partition wall is in a range of 2 micrometers to 3 micrometers, inclusive.

7. The electroluminescent display device of claim 5 , wherein a height of each of the first partition wall and the second partition wall is in a range of 7 micrometers to 9 micrometers, inclusive.

8. The electroluminescent display device of claim 1 , wherein each of the second refractive index and the fourth refractive index is in a range of 1.0 to 1.55, inclusive.

9. The electroluminescent display device of claim 1 , wherein the color filter layer further includes a scattering layer disposed on an upper surface of each of the plurality of color filter patterns.

10. The electroluminescent display device of claim 9 , wherein the scattering layer has a concavo-convex pattern.

11. The electroluminescent display device of claim 9 , wherein the scattering layer is formed of one or more materials including beads.

12. The electroluminescent display device of claim 1 , wherein an edge of each of the plurality of color filter patterns is curved.

13. The electroluminescent display device of claim 1 , wherein each of the plurality of light emitting diodes includes:
a first electrode disposed on a passivation layer;
an insulating pattern configured to cover an edge of the first electrode;
a light-emitting layer disposed on the first electrode and the insulating pattern; and
a second electrode disposed on the light-emitting layer.

14. The electroluminescent display device of claim 13 , further including an interlayer insulating layer disposed under the passivation layer, wherein the passivation layer and the interlayer insulating layer are separated in each pixel region by the first partition wall.

15. The electroluminescent display device of claim 13 , wherein a width of a first portion of the light-emitting layer on the first electrode is greater than a width of a second portion of the light-emitting layer on the insulating pattern.

Assignees

• Lg Display Co Ltd

Inventors

• Lim Hyeong-Jun
• Park Han-Sun
• Bang Hyung-Seok
• Park Ji-Yeon

Classifications

• H10K59/879 Primary

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

• H10K59/878

  comprising reflective means · CPC title

• H10K59/8731

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K59/8052

  Cathodes · CPC title

• H10K59/38 Primary

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