Display device

Patent metadata

Field	Value
Publication number	US-10319792-B2
Application number	US-201715657021-A
Country	US
Kind code	B2
Filing date	Jul 21, 2017
Priority date	Dec 28, 2016
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A thin and lightweight display device is disclosed. The display device includes a black bridge electrically connected to a plurality of touch electrodes disposed on an encapsulation unit, wherein the black bridge is disposed on the encapsulation unit between color filters to also serve as a black matrix, with the result that a cell gap between the black bridge and an anode electrode is reduced when compared with a comparative example, thereby securing a wide viewing angle, and wherein the touch electrodes are disposed on the encapsulation unit, with the result that an additional bonding process is not required, whereby the process is simplified and cost is reduced.

First claim

What is claimed is:

1. A display device comprising:
a light-emitting element disposed on a substrate;
an encapsulation unit disposed on the light-emitting element;
a touch sensor having a plurality of first and second touch electrodes disposed on the encapsulation unit, the light-emitting element enclosed in part by the encapsulation unit;
a routing line electrically connected to a corresponding one of the first touch electrodes or the second touch electrodes and disposed to cover a side surface of the encapsulation unit;
a plurality of color filters disposed on the first touch electrodes and the second touch electrodes; and
a plurality of black bridges disposed on the encapsulation unit to electrically connect the plurality of first touch electrodes, and disposed between the color filters,
wherein the black bridges are formed between the first touch electrodes and the encapsulation unit and between the second touch electrodes and the encapsulation unit.

2. The display device according to claim 1 , wherein the black bridges include at least one oxide thin film layer and at least one black conductive layer on the encapsulation unit.

3. The display device according to claim 1 , wherein the black bridges comprise a first black conductive layer, a first oxide thin film layer, a second black conductive layer, and a second oxide thin film layer on the encapsulation unit.

4. The display device according to claim 2 , wherein the at least one oxide thin film layer is formed of at least one transparent oxide selected from among ITO, TiO x , Al 2 O 3 , ZnO x , and SiO x .

5. The display device according to claim 2 , wherein the at least one black conductive layer is formed of at least one selected from among Cr, Mo, Al, Ag, Au, and Co, and has a single- or multi-layer structure.

6. The display device according to claim 3 , wherein the first black conductive layer is thicker than the second black conductive layer.

7. The display device according to claim 3 , wherein the second black conductive layer is thinner than the first black conductive layer, the first oxide thin film layer or the second oxide thin film layer.

8. The display device according to claim 3 , wherein the second black conductive layer has a higher refractive index than the first black conductive layer.

9. The display device according to claim 3 , wherein at least one of the first oxide thin film layer and the second oxide thin film layer has a lower refractive index than a corresponding one of the first black conductive layer and the second black conductive layer.

10. The display device according to claim 1 , wherein the light-emitting element comprises:
an anode electrode disposed on the substrate;
a cathode electrode disposed opposite the anode electrode; and
at least one light-emitting stack disposed between the anode electrode and the cathode electrode, and
wherein the black bridges overlap a bank formed to expose the anode electrode.

11. The display device according to claim 10 , wherein a width of the black bridge is equal to or less than a width of the bank.

12. The display device according to claim 10 , further comprising:
at least one layer of lower dielectric film disposed between the substrate and the encapsulation unit; and
a touch pad electrically connected to the corresponding one of the first touch electrodes or the second touch electrodes via the routing line.

13. The display device according to claim 12 , wherein the routing line includes at least one oxide thin film layer and at least one black conductive layer.

14. The display device according to claim 12 , wherein the touch pad comprises a pad electrode extending from the routing line and a pad cover electrode on the pad electrode.

15. The display device according to claim 14 , wherein the pad electrode comprises at least one oxide thin film layer and at least one black conductive layer.

16. The display device according to claim 1 , wherein the first touch electrodes and the second touch electrodes are disposed between the black bridge and the color filters.

17. The display device according to claim 12 , further comprising:
a driving transistor connected to the light-emitting element;
a first dielectric film disposed between a gate electrode and an active layer of the driving transistor;
a second dielectric film disposed between the active layer and source and drain electrodes; and
a third dielectric film disposed between the source and drain electrodes and the light-emitting element,
wherein the at least one layer of lower dielectric film is at least one of the first to third dielectric films.

18. The display device according to claim 1 , wherein
the black bridges comprise:
a first black bridge configured to contact one side of a corresponding one of the first touch electrodes; and
a second black bridge configured to contact another side of a corresponding one of the first touch electrodes, and wherein
at least one of the first black bridges and the second black bridges is formed in a folding shape.

19. The display device according to claim 1 , wherein the plurality of black bridges serve as black matrixes.

20. The display device according to claim 18 , wherein
the first touch electrodes and the second touch electrodes are formed in a mesh shape.

21. The display device according to claim 20 , further comprising a mesh-shaped bridge electrically connected to the second touch electrodes.

22. The display device according to claim 21 , wherein the first black bridge is disposed to bypass one side of the mesh-shaped bridge, and the second black bridge is disposed to bypass another side of the mesh-shaped bridge.

23. The display device according to claim 18 , wherein one of the first and the second black bridges is formed in a “<” shape, and another of the first and the second black bridges is formed in a “>” shape.

24. The display device according to claim 21 , wherein the first mesh-shaped touch electrode, the second mesh-shaped touch electrode and the mesh-shaped bridge comprise a first black conductive layer, a first oxide thin film layer, a second black conductive layer, and a second oxide thin film layer.

25. The display device according to claim 1 , further comprising:
a touch planarization film formed on the color filters.

Assignees

• Lg Display Co Ltd

Inventors

• Jo Jang
• Yoon Jong-Geun

Classifications

• H01L27/3246

  Electricity · mapped topic

• H01L2251/5315

  Electricity · mapped topic

• H01L27/323 Primary

  Electricity · mapped topic

• H01L27/3244

  Electricity · mapped topic

• H01L51/5284

  Electricity · mapped topic