Light emitting display apparatus

Patent metadata

Field	Value
Publication number	US-11877490-B2
Application number	US-202016901862-A
Country	US
Kind code	B2
Filing date	Jun 15, 2020
Priority date	Aug 6, 2019
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

A light emitting display apparatus includes a substrate including a plurality of sub-pixels, an overcoating layer on the substrate and having a base portion and a protrusion portion, a first electrode disposed to cover the base portion and a side portion of the protrusion portion at the plurality of sub-pixels, a bank layer covering a portion of the first electrode and the overcoating layer, a light emitting layer and a second electrode on the first electrode and the bank layer at the plurality of sub-pixels, and a cut-off layer on the second electrode to overlap the bank layer.

First claim

What is claimed is:

1. A light emitting display apparatus, comprising:
a substrate including a display area and a non-display area;
a plurality of transistors disposed on the substrate;
a plurality of sub-pixels electrically connected to the plurality of transistors, respectively, each sub-pixel comprising a light emitting element;
an encapsulation part disposed on the light emitting element; and
a cut-off layer disposed on the encapsulation part of only a blue sub-pixel of the plurality of sub-pixels, the cut-off layer having an opening area and a non-opening area,
wherein the blue sub-pixel includes a light emitting area, the light emitting area being located at the opening area of the cut-off layer,
wherein the cut-off layer is disposed only at a non-light emitting area in the blue sub-pixel among the plurality of sub-pixels, and
wherein the cut-off layer transmits only blue light.

2. The light emitting display apparatus of claim 1 ,
wherein the light emitting element includes a light emitting layer,
wherein the light emitting display apparatus further comprises:
an overcoating layer on the substrate and having a base portion and a protrusion portion;
a first electrode disposed to cover the base portion and a side portion of the protrusion portion at the plurality of sub-pixels;
a bank layer covering a portion of the first electrode and the overcoating layer; and
the light emitting layer and a second electrode on the first electrode and the bank layer at the plurality of sub-pixels, and

wherein the plurality of sub-pixels include the non-light emitting area in which the bank layer is disposed and the light emitting area surrounded by the non-light emitting area.

3. The light emitting display apparatus of claim 2 , wherein the plurality of sub-pixels include a red sub-pixel, a green sub-pixel and the blue sub-pixel.

4. The light emitting display apparatus of claim 2 , wherein the encapsulation part is on the second electrode, and
wherein the cut-off layer includes a blue color filter on an upper surface of the encapsulation part.

5. The light emitting display apparatus of claim 2 , wherein the encapsulation part is on the second electrode,
wherein the encapsulation part includes a first encapsulation layer formed of an inorganic material, a second encapsulation layer on the first encapsulation layer and formed of an organic material, and a third encapsulation layer on the second encapsulation layer and formed of an inorganic material, and
wherein the cut-off layer includes the third encapsulation layer, a first inorganic insulating layer on the third encapsulation layer and overlapping the bank layer, and a second inorganic insulating layer on the first inorganic insulating layer.

6. The light emitting display apparatus of claim 5 , wherein the third encapsulation layer and the second inorganic insulating layer are formed of a same material, and
the first inorganic insulating layer is formed of a material having a refractive index lower than a refractive index of the third encapsulation layer or the second inorganic insulating layer.

7. The light emitting display apparatus of claim 2 , further comprising:
a touch part on the encapsulation part,
wherein the encapsulation part is on the second electrode,
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 and a touch electrode on the first inorganic insulating layer or the second inorganic insulating layer, and

wherein the cut-off layer includes the first inorganic insulating layer, the second inorganic insulating layer, and a third inorganic insulating layer between the first inorganic insulating layer and the second inorganic insulating layer and overlapping the bank layer.

8. The light emitting display apparatus of claim 7 , wherein the first inorganic insulating layer and the second inorganic insulating layer are formed of silicon nitride (SiNx) or silicon oxynitride (SiNxOy), and
wherein the third inorganic insulating layer is formed of silicon oxide (SiOx).

9. The light emitting display apparatus of claim 2 , wherein the light emitting layer is disposed separately in each of the plurality of sub-pixels, and
wherein a thickness of the light emitting layer is configured to implement a micro-cavity in each of the plurality of sub-pixels.

10. The light emitting display apparatus of claim 2 , wherein the first electrode comprises a reflective layer that covers the side portion of the protrusion portion.

11. The light emitting display apparatus of claim 2 , wherein the cut-off layer overlaps the protrusion portion.

12. The light emitting display apparatus of claim 2 , wherein the cut off layer is disposed on the first electrode.

13. The light emitting display apparatus of claim 1 , wherein the cut-off layer is a touch part or a part of color filters.

14. The light emitting display apparatus of claim 1 , wherein the cut-off layer transmits a wavelength of light having a predetermined color and cuts off wavelengths of light that are longer than the wavelength of light having the predetermined color.

15. A light emitting display apparatus, comprising:
a substrate including a display area and a non-display area;
a plurality of transistors disposed on the substrate;
a plurality of sub-pixels electrically connected to the plurality of transistors, respectively, each sub-pixel comprising a light emitting element;
an encapsulation part disposed on the light emitting element; and
a color coordinate change prevention layer disposed on the encapsulation part of only a blue sub-pixel of the plurality of sub-pixels, the color coordinate change prevention layer having an opening area and a non-opening area,
wherein the blue sub-pixel includes a light emitting area, the light emitting area being located at the opening area of the color coordinate change prevention layer,
wherein the color coordinate change prevention layer is disposed only at a non-light emitting area in the blue sub-pixel among the plurality of sub-pixels, and
wherein the cut-off layer transmits only blue light.

16. The light emitting display apparatus of claim 15 , wherein the light emitting element includes a light emitting layer,
wherein the light emitting display apparatus further comprises:
an overcoating layer having a protrusion portion protruding from the non-light emitting area of the blue sub-pixel;
the light emitting element including a first electrode contacting the protrusion portion, the light emitting layer on the first electrode, and a second electrode on the light emitting layer; and
a bank layer covering a portion of the first electrode and the protrusion portion, and

wherein the color coordinate change prevention layer is disposed to overlap the bank layer.

17. The light emitting display apparatus of claim 16 , wherein the encapsulation part is between the light-emitting element and the color coordinate change prevention layer, and
wherein the color coordinate change prevention layer includes a blue color filter on an upper surface of the encapsulation part.

18. The light emitting display apparatus of claim 16 , wherein the color coordinate change prevention layer includes three inorganic insulating layers, and
wherein among the three inorganic insulating layers, a first inorganic insulating layer and a second inorganic insulating layer are formed of a same material, and a third inorganic insulating layer is formed of a material hav

Assignees

• Lg Display Co Ltd

Inventors

• Sim Dongmin
• Choi Hyekyung
• Han Kyunghoon

Classifications

• H10K59/8731

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

• H10K59/878 Primary

  comprising reflective means · CPC title

• H10K59/131

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K50/86

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• H10K50/856

  comprising reflective means · CPC title