Light-emitting display device

Patent metadata

Field	Value
Publication number	US-2025098391-A1
Application number	US-202418966133-A
Country	US
Kind code	A1
Filing date	Dec 3, 2024
Priority date	Dec 22, 2020
Publication date	Mar 20, 2025
Grant date	—

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;
a protruding portion between two adjacent concave portions among the plurality of concave portions; and
an inclined portion between a bottom surface of one of the two adjacent concave portions and a vertex of the protruding portion; and
a light-emitting device layer comprising:
a light-emitting layer over the light extraction pattern;
a first area disposed over the vertex of the protruding portion and having a first thickness;
a second area disposed over the bottom surface of the one of the two adjacent concave portions and having a second thickness; and
a third area disposed over the inclined portion and having a third thickness, wherein the first thickness and the second thickness are larger than the third thickness.

2 . The light-emitting display device of claim 1 , wherein the first area and the second area are configured to generate weaker light emission than the third area.

3 . The light-emitting display device of claim 1 , wherein the light-emitting layer comprises:
a convex light-emitting layer corresponding to the first area; and a curved light-emitting layer corresponding to the third area.

4 . The light-emitting display device of claim 3 , wherein the first area includes a convex curved shape corresponding to the convex light-emitting layer.

5 . The light-emitting display device of claim 3 , wherein the first thickness of the first area corresponds to a maximum thickness of the convex light-emitting layer.

6 . The light-emitting display device of claim 3 , wherein the third thickness of the third area corresponds to a shortest distance between one end and another end of the curved light-emitting layer.

7 . The light-emitting display device of claim 3 , wherein:
the first area has a width W defined by the following equation:

W
=

2
×
d
×
sin
⁢
θ

,

where ‘θ’ is an angle in a range from 34 degrees to 60 degrees,
where ‘W’ is a shortest distance between one end and the other end of the convex light-emitting layer connected to the curved light-emitting layer with respected to the vertex of the protruding portion, and
where ‘d’ is a smallest thickness of the light-emitting layer; and

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

8 . The light-emitting display device of claim 7 , 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.

9 . The light-emitting display device of claim 8 , 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.

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

11 . The light-emitting display device of claim 1 , wherein the second area overlaps a bottom portion of each of the plurality of concave portions in a respective pixel among the plurality of pixels.

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

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

14 . 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.

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

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