Light emitting display apparatus

Patent metadata

Field	Value
Publication number	US-11276838-B2
Application number	US-202016886140-A
Country	US
Kind code	B2
Filing date	May 28, 2020
Priority date	Jul 19, 2019
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A light emitting display apparatus according to an exemplary embodiment of the present disclosure includes a plurality of light emitting elements on a substrate, an encapsulation part on the plurality of light emitting elements, a plurality of light collecting patterns on the encapsulation part and formed of an inorganic material, and an organic layer on the encapsulation part and the plurality of light collecting patterns and formed of a material having a refractive index lower than a refractive index of the plurality of light collecting patterns.

First claim

What is claimed is:

1. A light emitting display apparatus, comprising:
a plurality of light emitting elements on a substrate;
an encapsulation part on the plurality of light emitting elements;
a plurality of light collecting patterns on the encapsulation part and formed of an inorganic material; and
an organic layer on the encapsulation part and the plurality of light collecting patterns, and formed of a material having a refractive index lower than a refractive index of the plurality of light collecting patterns.

2. The light emitting display apparatus of claim 1 , wherein the plurality of light collecting patterns are disposed to overlap the plurality of light emitting elements.

3. The light emitting display apparatus of claim 1 , wherein the plurality of light collecting patterns are composed of a plurality of inorganic patterns that are stacked.

4. The light emitting display apparatus of claim 1 , further comprising:
a polarizing plate on the organic layer,
wherein the organic layer is an adhesive layer on a lower surface of the polarizing plate.

5. The light emitting display apparatus of claim 1 , further comprising:
a polarizing plate on the organic layer; and
an adhesive layer on a lower surface of the polarizing plate,
wherein an upper surface of the organic layer is in contact with the adhesive layer.

6. The light emitting display apparatus of claim 1 , further comprising:
a touch part on the encapsulating part,
wherein the touch part includes a first inorganic insulating layer on the encapsulation part, a second inorganic insulating layer on the first inorganic insulating layer, and a touch line on the first inorganic insulating layer or the second inorganic insulating layer, and
wherein the plurality of light collecting patterns are configured to include a first layer disposed in the same layer as the first inorganic insulating layer, and a second layer on the first layer and disposed in the same layer as the second inorganic insulating layer.

7. The light emitting display apparatus of claim 6 , wherein the organic layer planarizes the second inorganic insulating layer and the touch line.

8. The light emitting display apparatus of claim 6 , wherein the touch part further includes a third inorganic insulating layer covering the second inorganic insulating layer and the touch line, and
wherein the light collecting patterns include a third layer on the second layer and disposed in the same layer as the third inorganic insulating layer.

9. The light emitting display apparatus of claim 8 , wherein the first inorganic insulating layer, the second inorganic insulating layer, and the third inorganic insulating layer are composed with materials having the same refractive index.

10. The light emitting display apparatus of claim 1 , wherein a light emission angle of the plurality of light emitting elements is approximately 11 degrees to approximately 20 degrees.

11. The light emitting display apparatus of claim 10 , wherein the plurality of light collecting patterns and the organic layer refract light emitted from the plurality of light emitting elements in a front direction.

12. The light emitting display apparatus of claim 10 , wherein the plurality of light emitting elements include a red light emitting element, a green light emitting element and a blue light emitting element, and
each of the plurality of light emitting elements includes a first electrode, a hole transporting layer, an organic light emitting layer, an electron transporting layer, and a second electrode.

13. The light emitting display apparatus of claim 12 , wherein a thickness of the hole transporting layer of the red light emitting element is approximately 190 nm.

14. The light emitting display apparatus of claim 12 , wherein a thickness of the hole transporting layer of the green light emitting element is approximately 130 nm to approximately 150 nm.

15. The light emitting display apparatus of claim 12 , wherein a thickness of the hole transporting layer of the blue light emitting element is approximately 90 nm to approximately 110 nm.

16. A light emitting display apparatus, comprising:
a substrate including a light emitting area and a non-light emitting area;
a light emitting element at the light emitting area, and configured to emit light at a light emission angle;
an encapsulation part on the light emitting element; and
a light collecting part being in contact with an upper surface of the encapsulation part and configured to collect the light emitted from the light emitting element, in a front direction, rather than at the light emission angle,
wherein the light collecting part includes a plurality of light collecting patterns and an organic layer disposed to cover the plurality of light collecting patterns, the organic layer having a refractive index lower than a refractive index of the plurality of light collecting patterns.

17. The light emitting display apparatus of claim 16 , wherein the plurality of light collecting patterns have a shape of any one of a pyramidal lens, a hemispherical lens, a conical lens, a lenticular lens, a prismatic lens, and a concave lens.

18. The light emitting display apparatus of claim 17 , wherein the light collecting part includes a surface inclined with respect to a center of the light collecting part, and a vertex angle of the light collecting part is approximately 60 degrees.

19. The light emitting display apparatus of claim 16 , further comprising:
a polarizing plate on the organic layer,
wherein the organic layer is an adhesive layer that attaches the plurality of light collecting patterns and the polarizing plate.

20. The light emitting display apparatus of claim 16 , further comprising:
an adhesive layer in contact with an upper surface of the organic layer; and
a polarizing plate in contact with an upper surface of the adhesive layer.

21. The light emitting display apparatus of claim 16 , further comprising:
a touch part on the encapsulation part and implemented together with the light collection part.

22. The light emitting display apparatus of claim 16 , wherein the light emission angle is approximately 11 degrees to approximately 20 degrees.

23. The light emitting display apparatus of claim 16 , wherein the light emitting element includes a first electrode, a hole transporting layer, a red light emitting layer, an electron transporting layer and a second electrode, and
wherein a thickness of the hole transporting layer is approximately 47.5% of a sum of thicknesses of the hole transporting layer, the red light emitting layer and the electron transporting layer.

24. The light emitting display apparatus of claim 16 , wherein the light emitting element includes a first electrode, a hole transporting layer, a green light emitting layer, an electron transporting layer and a second electrode, and
wherein a thickness of the hole transporting layer is approximately 48% to approximately 51.7% of a sum of thicknesses of the hole transporting layer, the green light emitting layer and the electron transporting layer.

25. The light emitting display apparatus of claim 16 , wherein the light emitting element includes a first electrode, a hole transporting layer, a blue light emitting layer, an electron transporting layer and a second electrode, and
wherein a thickness of the hole transporting layer is approximately 47.4% to approximately 52.4% of a sum of thicknesses of the

Assignees

• Lg Display Co Ltd

Inventors

• Kim Taemin
• Koo Wonhoe
• Park Jihyeon

Classifications

• H10K59/87

  Passivation; Containers; Encapsulations · CPC title

• H10K59/877

  comprising scattering means · CPC title

• H10K59/40 Primary

  OLEDs integrated with touch screens · CPC title

• H10K59/879 Primary

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

• H10K59/12 Primary

  Active-matrix OLED [AMOLED] displays · CPC title