Display device

Patent metadata

Field	Value
Publication number	US-12075684-B2
Application number	US-202218075633-A
Country	US
Kind code	B2
Filing date	Dec 6, 2022
Priority date	Dec 31, 2021
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

A display device including a substrate including a display area; a light-emitting element positioned on the substrate; a bank including a first opening corresponding to the light-emitting element; an encapsulation layer positioned on the light-emitting element; a touch electrode positioned on the encapsulation layer; a black matrix positioned on the touch electrode and including a first layer and a second layer positioned on the first layer, the second layer having a lower refractive index than the first layer; and a color filter positioned on the touch electrode.

First claim

What is claimed is:

1. A display device comprising:
a substrate including a display area;
a light-emitting element positioned on the substrate;
a bank comprising a first opening corresponding to the light-emitting element;
an encapsulation layer positioned on the light-emitting element;
a touch electrode positioned on the encapsulation layer;
a black matrix positioned on the touch electrode and including a first layer and a second layer, the first layer being disposed between the touch electrode and the second layer, and the second layer having a lower refractive index than the first layer; and
a color filter positioned on the touch electrode,
wherein the first layer includes a refractive index in a range of 2.1-2.7 and the second layer includes a refractive index in a range of 1.4-1.8.

2. The display device of claim 1 , wherein the first layer directly contacts the second layer.

3. The display device of claim 1 , wherein an area in which the first layer is positioned is substantially the same as an area in which the second layer is positioned.

4. The display device of claim 1 , wherein the first layer, the second layer, and the touch electrode overlap each other in the display area.

5. The display device of claim 1 , wherein:
the touch electrode comprises a second opening; and
the first opening of the bank is formed within the second opening of the touch electrode.

6. The display device of claim 5 , wherein:
the black matrix comprises a third opening; and
the third opening of the black matrix is positioned within a second opening of the touch electrode.

7. The display device of claim 6 , wherein:
the first opening of the bank is formed within the third opening of the black matrix.

8. The display device of claim 6 , wherein a portion of the color filter is disposed on the second layer, and
wherein the color filter is filled in the third opening.

9. The display device of claim 1 , wherein a sum of thicknesses of the first and second layers of the black matrix is greater than a thickness of the color filter.

10. A display device comprising:
a plurality of light-emitting element disposed on a substrate;
a bank comprising a plurality of first openings defining emission areas for the plurality of light-emitting elements;
an encapsulation layer disposed on the bank and the light-emitting elements;
a mesh type electrode pattern disposed on the encapsulating layer and including a plurality of touch electrode portions and a plurality of second openings respectively overlapping the plurality of first openings so the touch electrode portions are disposed in non-emission areas outside the emission areas defined by the bank;
a touch buffer layer disposed on the mesh type electrode pattern;
a black matrix pattern positioned on the touch buffer layer and including a plurality of black matrix portions and a plurality of third openings respectively overlapping the plurality of first openings so the black matrix portions are disposed in the non-emission areas, wherein each black matrix portion includes a first layer disposed on the touch buffer layer and a second layer disposed on the first layer, the first layer being disposed between one of the plurality of touch electrode portions and the second layer, and the second layer having a lower refractive index than the first layer; and
a plurality of color filters disposed within the third openings of the black matrix pattern,
wherein the first layer includes a refractive index in a range of 2.1-2.7 and the second layer includes a refractive index in a range of 1.4-1.8.

11. The display device of claim 10 , wherein the first layer of the black matrix portions directly contacts the second layer of the black matrix portions.

12. The display device of claim 10 , wherein an area in which the first layer of the black matrix portions is disposed is substantially the same as an area in which the second layer of the black matrix portions is disposed.

13. The display device of claim 10 , wherein a width of a corresponding black matrix portion is greater than a width of a corresponding touch electrode portion.

14. The display device of claim 10 , wherein the plurality of color filter disposed within the third openings of the black matrix extend onto a top surface of the first layer of an adjacent black matrix portion.

15. The display device of claim 10 , wherein a width of a corresponding second opening is greater than a width of a corresponding third opening, and the width of the corresponding third opening is greater than a width of a corresponding first opening.

16. The display device of claim 10 , further comprising:
another touch buffer layer disposed between the encapsulation layer and the mesh type electrode pattern.

17. The display device of claim 10 , wherein a thickness of the first layer of the black matrix portions is greater than a thickness of the second layer of the black matrix portions.

18. The display device of claim 10 , wherein a sum of thicknesses of the first and second layers of the black matrix portions is greater than a thickness of the color filters such that the black matrix portions protrude above a top surface of the color filters.

Assignees

• Lg Display Co Ltd

Inventors

• Shin Youngsub
• Lee Daeheung
• Kim Younghoon

Classifications

• H10K59/126

  Shielding, e.g. light-blocking means over the TFTs · CPC title

• H10K59/873

  Encapsulations · CPC title

• G06F2203/04111

  Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• H10K59/38

  comprising colour filters or colour changing media [CCM] · CPC title