Display device with touch sensor

Patent metadata

Field	Value
Publication number	US-11656701-B2
Application number	US-202017102017-A
Country	US
Kind code	B2
Filing date	Nov 23, 2020
Priority date	Sep 30, 2016
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

Disclosed is an organic light emitting display having reduced thickness and weight. The organic light emitting display with a touch sensor removes the necessity of an additional adhesion process by directly forming a touch sensor including a touch sensing line and a touch driving line and a color filter on the encapsulation layer covering a light emitting device, thereby simplifying a manufacturing process and reducing manufacturing costs.

First claim

What is claimed is:

1. A display device comprising:
a light-emitting device disposed on a substrate;
an encapsulation unit disposed on the light-emitting device;
a plurality of touch electrodes disposed on the encapsulation unit, the plurality of touch electrodes including:
first touch electrodes arranged in a first direction;
second touch electrodes arranged in a second direction which intersects the first direction
first bridges configured to interconnect the first touch electrodes; and
second bridges configured to interconnect the second touch electrodes, the second bridges being disposed in a different plane from the first bridges; and

a routing line connected to the plurality of touch electrodes and disposed along a lateral surface of the encapsulation unit,
wherein each of the second bridges has a first end, a second end opposite to the first end, and a plurality of openings between the first end and the second end,
each of the first end and the second end is in contact with a respective one of the second touch electrodes, and
the plurality of openings are penetrated through a corresponding one of the second bridges and spaced apart from each other along a longitudinal direction of the corresponding one of the second bridges between the first end and the second end.

2. The display device according to claim 1 , wherein the plurality of openings are linearly disposed in the second direction and each of the plurality of openings is longer in the first direction than the second direction.

3. The display device according to claim 1 , further comprising:
a touch dielectric film disposed between the first bridges and the second bridges, wherein
the second bridges are disposed on the encapsulation unit,
the first touch electrodes, the second touch electrodes, and the first bridges are disposed on the touch dielectric film, and
the second touch electrodes are connected to the second bridges, which are exposed through touch contact holes formed through the touch dielectric film corresponding to the first end and the second end of the second bridges.

4. The display device according to claim 1 ,
wherein the second bridges are disposed between the first touch electrodes, the second touch electrodes, and the encapsulation unit, and
wherein the plurality of openings in the second bridges is filled with a touch dielectric film.

5. The display device according to claim 1 , wherein at least one of the first bridges, the second bridges, the first touch electrodes, and the second touch electrodes is configured to have a structure in which a plurality of conductive films is stacked, and wherein at least one of the plurality of conductive films has a multi-layered structure comprising at least one of Al, Ti, Cu, Mo, ITO, and IZO.

6. The display device according to claim 1 ,
wherein at least one of the first bridges, the second bridges, the first touch electrodes, and the second touch electrodes is configured to have a structure in which a plurality of conductive films is stacked, and
wherein at least one of the plurality of conductive films comprises at least one of Ti/Al/Ti and Mo/Al/Mo.

7. The display device according to claim 1 , wherein at least one of the first touch electrodes, the second touch electrodes, the first bridges, and the second bridges comprises a mesh-shaped conductive film having an opening formed therein, and
wherein the mesh-shaped conductive film overlaps a bank configured to define a light-emitting region of the light-emitting device.

8. The display device according to claim 7 , wherein the bank is disposed such that the opening has a diamond shape.

9. The display device according to claim 7 , wherein the mesh-shaped conductive film is disposed along the bank.

10. The display device according to claim 1 , wherein at least one of the plurality of openings overlaps a light-emitting region.

11. The display device according to claim 1 , wherein the routing line contacts the lateral surface of the encapsulation unit.

12. The display device according to claim 1 , wherein the display device is bendable and curvable, and wherein an organic layer is disposed in a bendable and curvable region of the display device.

13. The display device according to claim 1 , wherein the routing line is configured to have a structure in which a plurality of routing layers, comprising a lower routing layer and an upper routing layer, is stacked.

14. The display device according to claim 1 , further comprising:
a touch pad connected to the routing line, wherein
the touch pad is configured to have a structure in which a plurality of pad layers is stacked,
wherein at least one of the pad layers comprises one of Ti/Al/Ti and Mo/Al/Mo.

15. The display device according to claim 14 , wherein at least one of the pad layers is disposed on a same layer and is made of a same material as at least one of the first bridges and the second bridges.

16. The display device according to claim 14 , wherein a total number of routing lines extending from a left side and a right side of the display device to the touch pad is equal to or different from a total number of routing lines extending from an upper side and a lower side of the display device to the touch pad.

17. The display device according to claim 14 , further comprising:
a thin film transistor connected to the light-emitting device, wherein
the thin film transistor comprises:
a gate electrode disposed on the substrate;
an active layer disposed on or under the gate electrode;
a source electrode connected to the active layer; and
a drain electrode connected to the active layer,
wherein the routing line and the touch pad are positioned at an outer edge of the substrate, and is disposed on one of a plurality of dielectric films located between the light-emitting device and the substrate.

18. The display device according to claim 17 , wherein the dielectric films comprise:
a gate dielectric film disposed on the gate electrode and the active layer of the thin film transistor;
a passivation film disposed between the source electrode and the drain electrode and the active layer of the thin film transistor; and
a planarization layer disposed on the source electrode and the drain electrode, and
wherein the routing line overlaps at least one of the gate dielectric film, the passivation film, a bank, the planarization layer, and the encapsulation unit at the outer edge of the substrate.

19. The display device according to claim 1 , wherein a distance between the substrate and the routing line is smaller than a distance between the substrate and the plurality of touch electrodes.

20. The display device according to claim 1 , wherein
the encapsulation unit comprises first inorganic encapsulation layer and a second inorganic encapsulation layer that face each other in a state in which an organic encapsulation layer is disposed therebetween,
the second inorganic encapsulation layer is disposed so as to cover an upper surface and a lateral surface of the organic encapsulation layer, and
the organic encapsulation layer is disposed so as to cover an upper surface of the first inorganic encapsulation layer.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Jae-Won
• Nam Seung-Hee
• Kim Min-Joo
• Park Kwon-Shik
• Oh Jae-Young
• Lee Deuk-Su
• Lee Bu-Yeol
• Lee Eun-Hye
• Kim Tae-Hwan

Classifications

• H10K59/131

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

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/8731

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

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · 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