Light-emitting display device

Patent metadata

Field	Value
Publication number	US-12176382-B2
Application number	US-202117545617-A
Country	US
Kind code	B2
Filing date	Dec 8, 2021
Priority date	Dec 22, 2020
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

A light-emitting display device includes: a substrate, a plurality of pixels on the substrate, each pixel including an opening area, a light extraction pattern disposed in each opening area, the light extraction pattern including: a plurality of concave portions spaced apart from each other, and a protruding portion surrounding each of the plurality of concave portions, and a light-emitting device layer including: a light-emitting layer over the light extraction pattern, and a non-emission area overlapping a top portion of the protruding portion between the two adjacent concave portions.

First claim

What is claimed is:

1. A light-emitting display device, comprising:
a substrate;
a plurality of pixels on the substrate, each pixel comprising an opening area;
a light extraction pattern disposed in the opening area, the light extraction pattern comprising:
a plurality of concave portions spaced apart from each other; and
a protruding portion surrounding each of the plurality of concave portions; and

a light-emitting device layer comprising:
a light-emitting layer over the light extraction pattern; and
a non-emission area overlapping a peak of the protruding portion between two adjacent concave portions among the plurality of concave portions.

2. The light-emitting display device of claim 1 , wherein:
the protruding portion comprises:
a sharp portion at the peak and having a sharp tip structure; and
an inclined portion inclined from the sharp portion; and

the non-emission area comprises a non-emission convex area overlapping the sharp portion.

3. The light-emitting display device of claim 2 , wherein:
the light-emitting layer comprises:
a convex light-emitting layer over the sharp portion; and
a curved light-emitting layer over the inclined portion; and

the non-emission convex area overlaps the convex light-emitting layer.

4. The light-emitting display device of claim 3 , wherein a width of the non-emission convex area corresponds to a maximum width of the convex light-emitting layer.

5. The light-emitting display device of claim 3 , wherein a width of the non-emission convex area corresponds to a shortest distance between one end and another end of the convex light-emitting layer connected to the curved light-emitting layer, with respect to the sharp portion.

6. The light-emitting display device of claim 3 , wherein:
the non-emission convex area has a width W defined by the following equation:
W= 2 ×d×sinθ,
where ‘θ’ is an angle from 34 degrees to 60 degrees, and
where ‘d’ is a thinnest thickness of the light-emitting layer; and

‘θ’ is an angle between a perpendicular line perpendicular to a tangential line of a portion having the thinnest thickness of the light-emitting layer, and a vertical line passing through the sharp portion.

7. The light-emitting display device of claim 6 , wherein:
the light-emitting device layer comprises:
a first electrode, which is in direct contact with the light extraction pattern; and
a second electrode over the first electrode; and

the light-emitting layer is between the first electrode and the second electrode.

8. The light-emitting display device of claim 7 , wherein:
the first electrode has a conformal shape with respect to the light extraction pattern; and
the light-emitting layer has a non-conformal shape with respect to the first electrode.

9. The light-emitting display device of claim 8 , wherein the second electrode has a conformal shape with respect to the light-emitting layer.

10. The light-emitting display device of claim 1 , wherein the opening area further comprises a non-light-emitting concave area overlapping a bottom portion of each of the plurality of concave portions in a respective pixel.

11. The light-emitting display device of claim 1 , further comprising a wavelength conversion layer between the substrate and the light extraction pattern.

12. The light-emitting display device of claim 1 , wherein the light extraction pattern is wider than the opening area.

13. The light-emitting display device of claim 1 , wherein:
the plurality of concave portions are arranged in parallel to have a predetermined interval between each other along a first direction; and
each of the plurality of concave portions are alternately arranged along a second direction crossing the first direction.

14. The light-emitting display device of claim 1 , wherein the protruding portion surrounding one concave portion has a hexagonal shape in a plan view.

15. A light-emitting display device, comprising:
a substrate;
a plurality of pixels on the substrate, each pixel comprising an opening area;
a planarization layer comprising a light extraction pattern disposed in the opening area, the planarization layer comprising:
a plurality of concave portions spaced apart from each other; and
a protruding portion surrounding each of the plurality of concave portions;

a first electrode over the light extraction pattern;
a light-emitting layer over the first electrode, the light-emitting layer comprising:
a top portion overlapping a peak of the protruding portion; and
a curved portion inclined from the top portion; and

a second electrode over the light-emitting layer,
wherein the opening area comprises a non-emission convex area overlapping the top portion of the light-emitting layer and the peak of the protruding portion.

16. The light-emitting display device of claim 15 , wherein:
the protruding portion comprises:
a sharp portion at the peak and comprising a sharp tip structure; and
an inclined portion between the sharp portion and a bottom portion of an adjacent concave portion among the plurality of concave portions;

the top portion of the light-emitting layer is disposed over the sharp portion; and
the curved portion of the light-emitting layer is disposed over the inclined portion.

17. The light-emitting display device of claim 16 , wherein the top portion of the light-emitting layer has a convex curved-line shape over the sharp portion.

18. The light-emitting display device of claim 16 , wherein a width of the non-emission convex area corresponds to a shortest distance between one end and another end of the top portion connected to the curved portion, with respect to the sharp portion.

19. The light-emitting display device of claim 16 , wherein:
the non-emission convex area has a width W defined by the following equation:
W= 2×d×sinθ,

where ‘θ’ is an angle from 34 degrees to 60 degrees, and
where ‘d’ is the thinnest thickness of the light-emitting layer; and

‘θ’ is an angle between a perpendicular line perpendicular to a tangential line of a portion comprising the thinnest thickness of the light-emitting layer, and a vertical line passing through the sharp portion.

20. The light-emitting display device of claim 15 , wherein:
the plurality of concave portions are arranged in parallel to have a predetermined interval between each other along a first direction and
each of the plurality of concave portions are alternately arranged along a second direction crossing the first direction.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Nayoung
• Choi Yonghoon
• Jo Soyoung
• Choi Mingeun

Classifications

• H10K59/879

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

• H10K59/878

  comprising reflective means · CPC title

• H10K59/80523

  Multilayers, e.g. opaque multilayers · CPC title

• H10K59/80521

  characterised by their shape · CPC title

• H10K59/80515 Primary

  characterised by their shape · CPC title