Light emitting display apparatus

Patent metadata

Field	Value
Publication number	US-11437605-B2
Application number	US-202016883573-A
Country	US
Kind code	B2
Filing date	May 26, 2020
Priority date	May 24, 2019
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

A light emitting display apparatus includes a substrate including a plurality of sub-pixels, each of the plurality of sub-pixels including a light emitting area and a reflective area surrounded by the light emitting area, an overcoating layer on the substrate, a partition at the reflective area on the overcoating layer, a light emitting element at the light emitting area on the overcoating layer, and a reflective part on the partition and formed of a same material as the light emitting element.

First claim

What is claimed is:

1. A light emitting display apparatus, comprising:
a substrate including a plurality of sub-pixels, each of the plurality of sub-pixels including a light emitting area and a reflective area surrounded by the light emitting area;
an overcoating layer on the substrate;
a partition at the reflective area on the overcoating layer;
a light emitting element at the light emitting area on the overcoating layer; and
a reflective part on the partition and formed of a same material as the light emitting element,
wherein the light emitting element includes:
a first electrode including a reflective layer;
a light emitting layer on the first electrode; and
a second electrode on the light emitting layer,

wherein the reflective part includes:
a first layer formed of a same material as the first electrode;
a second layer formed of a same material as the light emitting layer and disposed on the first layer; and
a third layer formed of a same material as the second electrode and disposed on the second layer, and

wherein the second electrode is spaced apart from the third layer so that the second electrode of the light emitting element is insulated from the third layer of the reflective part.

2. The light emitting display apparatus of claim 1 , wherein the light emitting layer is spaced apart from the second layer so that the light emitting layer is insulated from the second layer.

3. The light emitting display apparatus of claim 1 , further comprising a bank on the first electrode and including an opening portion exposing a portion of the first electrode,
wherein the partition and the reflective part are disposed at the opening portion and are spaced apart from the bank.

4. The light emitting display apparatus of claim 3 , wherein the overcoating layer includes:
a base portion between the substrate and the light emitting element; and
a protrusion portion between the base portion and the light emitting element,
wherein the first electrode extends from the base portion toward an upper surface of the protrusion portion, and
the bank covers the protrusion portion.

5. The light emitting display apparatus of claim 4 , wherein a height of the partition is lower than or equal to a height of the protrusion portion.

6. The light emitting display apparatus of claim 1 , wherein the reflective area is disposed in plural at least one sub-pixel among the plurality of sub-pixels, and
the light emitting area is integrally provided in all of the plurality of sub-pixels.

7. The light emitting display apparatus of claim 1 , wherein the partition is integrally provided with the overcoating layer.

8. The light emitting display apparatus of claim 1 , wherein an inclination of the partition is approximately 60 degrees or more.

9. A light emitting display apparatus, comprising:
an overcoating layer on a substrate;
a partition on the overcoating layer;
a light emitting element on the overcoating layer; and
a reflective part on the partition,
wherein the light emitting element is disposed to surround the reflective part,
some of light emitted from the light emitting element is reflected upwardly of the light emitting element by the reflective part to extract light to be lost laterally of the light emitting element,
wherein the light emitting element includes:
a first electrode including a reflective layer;
a light emitting layer on the first electrode; and
a second electrode on the light emitting layer,

wherein the reflective part includes:
a first layer formed of a same material as the first electrode;
a second layer formed of a same material as the light emitting layer and disposed on the first layer; and
a third layer formed of a same material as the second electrode and disposed on the second layer, and

wherein the second electrode is spaced apart from the third layer so that the second electrode is insulated from the third layer.

10. The light emitting display apparatus of claim 9 , wherein the first electrode and the first layer include a same reflective material.

11. The light emitting display apparatus of claim 9 , further comprising a bank covering a periphery portion of the first electrode,
wherein the bank is disposed to surround the reflective part.

12. The light emitting display apparatus of claim 11 , wherein the reflective part includes a plurality of sub-reflective parts along a side surface of the bank, and
wherein the first electrode is between the plurality of sub-reflective parts.

13. The light emitting display apparatus of claim 12 , wherein the plurality of sub-reflective parts are disposed to have a shape corresponding to a planar shape of a portion of the first electrode that is exposed from the bank, and
the plurality of sub-reflective parts are spaced apart from each other.

14. The light emitting display apparatus of claim 11 , wherein the reflective part includes a plurality of sub-reflective parts, some portions of the plurality of sub-reflective parts are in contact with each other, and some other portions of the plurality of sub-reflective parts are spaced apart from each other, and
wherein the first electrode is between the plurality of sub-reflective parts.

15. The light emitting display apparatus of claim 14 , wherein a planar shape of the plurality of sub-reflective parts is one among a bar shape, a cross shape, and an asterisk shape.

16. The light emitting display apparatus of claim 12 , wherein light emission efficiency of the light emitting display apparatus is optimized by adjusting one or more of:
the number of divisions obtained through dividing the light emitting element by the plurality of sub-reflective parts,
a distance between two adjacent ones of the plurality of sub-reflective parts,
a height of the partition, and
an area of the plurality of sub-reflective parts.

17. The light emitting display apparatus of claim 14 , wherein light emission efficiency of the light emitting display apparatus is optimized by adjusting one or more of:
the number of divisions obtained through dividing the light emitting element by the plurality of sub-reflective parts,
a distance between two adjacent ones of the plurality of sub-reflective parts,
a height of the partition, and
an area of the plurality of sub-reflective parts.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Yongcheol
• Koo Wonhoe
• Sim Dongmin
• Han Kyunghoon

Classifications

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K59/878 Primary

  comprising reflective means · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/80515 Primary

  characterised by their shape · CPC title

• H10K50/856

  comprising reflective means · CPC title