Organic light emitting display having touch sensor and method of fabricating the same

Patent metadata

Field	Value
Publication number	US-10340317-B2
Application number	US-201715621988-A
Country	US
Kind code	B2
Filing date	Jun 13, 2017
Priority date	Aug 31, 2016
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

Disclosed are an organic light emitting display having a touch sensor, which may achieve process simplification and cost reduction, and a method of fabricating the same. The organic light emitting display includes a compensation film having a flat surface and formed to cover dams forming a boundary with an organic encapsulation layer and the compensation film has a planarized surface between a region above the dams and a boundary region between the dams and the organic encapsulation layer (144) and may prevent cut and short-circuit of routing lines cutting across the same. Further, touch sensors are disposed on an encapsulation unit including the organic encapsulation layer and thus a separate attachment process is not required, thereby simplifying the overall process and reducing manufacturing costs of the organic light emitting display.

First claim

What is claimed is:

1. An organic light emitting display comprising:
light emitting elements disposed on an active area of a substrate;
an encapsulation unit disposed on the light emitting elements;
a touch sensor disposed on the encapsulation unit, the touch sensor including a touch sensing line and a touch driving line, wherein the touch driving line comprises first touch electrodes, and the touch sensing line comprises second touch electrodes;
routing lines connected to the touch sensor;
a touch pad disposed on a pad area of the substrate and connected to the touch sensor, the touch pad comprising:
a pad electrode on a same layer as a source electrode and a drain electrode of a thin film transistor on the substrate, the pad electrode connected to one of the routing lines and made of a same material as at least one of the routing lines or the source electrode and the drain electrode of the thin film transistor; and
a pad cover electrode on the pad electrode, the pad cover electrode made of a same material as at least one of the first touch electrodes or the second touch electrodes;

at least one dam disposed between the active area and the pad area, wherein the routing lines are above and overlap the at least one dam; and
a compensation film disposed between the light emitting elements and the routing lines and overlapping at least a part of the at least one dam,
wherein the compensation film has different thicknesses between a region above the at least one dam and a region between the at least one dam and the light emitting elements.

2. The organic light emitting display according to claim 1 , further comprising a plurality of color filters disposed between the touch sensor and the encapsulation unit,
wherein the compensation film is formed to have a monolayer or multilayer structure using the same material as at least one of the color filters.

3. The organic light emitting display according to claim 1 , further comprising:
a plurality of color filters disposed between the touch sensor and the encapsulation unit; and
a black matrix disposed between the color filters,
wherein the compensation film includes:
a first compensation film layer formed of the same material as the black matrix; and
a second compensation film layer formed of the same material as at least one of the color filters and disposed on the first compensation film layer.

4. The organic light emitting display according to claim 1 , further comprising:
a plurality of color filters disposed between the touch sensor and the encapsulation unit;
a black matrix disposed between the color filters; and
a touch buffer film disposed between the color filters and the touch sensor,
wherein the compensation film includes:
a first compensation film layer formed of the same material as the black matrix;
a second compensation film layer formed of the same material as at least one of the color filters and disposed on the first compensation film layer; and
a third compensation film layer formed of the same material as the touch buffer film and disposed on the second compensation film layer.

5. The organic light emitting display according to claim 1 , further comprising a touch buffer film disposed between the touch sensor and the encapsulation unit, wherein the compensation film is formed of the same material as at least one of the touch buffer film and an organic encapsulation layer of the encapsulation unit.

6. The organic light emitting display according to any one of claim 5 , wherein the touch buffer film is formed of one of acryl-based, epoxy-based and silane-based organic insulating materials.

7. The organic light emitting display according to claim 1 , wherein a thickness of the compensation film in the region above the at least one of at least one dam and the light emitting elements is less than a thickness of the compensation film in the region between the at least one dam and the light emitting elements.

8. The organic light emitting display according to claim 1 , wherein the routing lines intersect the dam with the compensation film interposed there between.

9. The organic light emitting display according to claim 8 , wherein a portion of the routing lines comprises a first and a second layer, wherein at least a portion of the first layer of the routing lines and the pad electrode are made of the same material as one of the first and second bridges, and wherein the second layer of the routing lines and the pad cover electrode are made of the same material as the at least one touch electrode.

10. The organic light emitting display according to claim 1 ,
wherein each of the light emitting elements comprises:
an anode disposed on the thin film transistor and connected to the thin film transistor;
a light emitting layer disposed on the anode; and
a cathode disposed on the light emitting layer.

11. The organic light emitting display according to claim 10 , wherein the the touch sensing line and the touch driving line intersect each other,
wherein the first touch electrodes are connected to one another through a first bridge,
wherein the second touch electrodes are connected to one another through a second bridge, and
wherein at least one of the first and second bridges is located corresponding to a bank for defining pixel areas.

12. The organic light emitting display according to claim 11 , wherein at least one of the first and second touch electrodes comprises:
a mesh metal layer have a mesh shaped pattern; and
a transparent conductive layer located on or under the mesh metal layer.

13. The organic light emitting display according to claim 11 , wherein at least one of the first and second bridges comprises a slit, the slit of the at least one of the first and second bridges overlaps with the other one of the first and second bridges.

14. The organic light emitting display according to claim 11 , wherein the at least one dam are formed to have a monolayer or multilayer structure using the same material as at least one of the bank and a spacer.

15. The organic light emitting display according to claim 11 , wherein at least one of the first touch electrodes and the second touch electrodes comprises a mesh metal film formed as a mesh.

16. The organic light emitting display according to claim 15 , wherein at least one of the first bridges or the second bridges is formed to have a monolayer or multilayer structure using at least one selected from the group consisting of Al, Ti, Cu and Mo.

17. The organic light emitting display according to claim 10 , wherein the routing lines are disposed on the same horizontal level in the region between the at least one dam and the light emitting elements and in the region above the at least one dam.

18. The organic light emitting display according to claim 1 , wherein the routing lines cover a side surface of the compensation film.

19. The organic light emitting display according to claim 10 , wherein the compensation film contacts one of a plurality of insulating films disposed under the light emitting elements, between the touch pad and the light emitting elements.

20. The organic light emitting display according to claim 19 , wherein the insulating films comprise:
a gate insulating film disposed between a gate electrode of the thin film transistor and a semiconductor layer of the thin film transistor;
a protective film disposed between source and drain electrodes and the semiconductor layer of the thin film transistor; and
a planarization film disposed between the thin film tra

Assignees

• Lg Display Co Ltd

Inventors

• Oh Jae-Young
• Kim Min-Joo
• Lee Jae-Won
• Lee Eun-Hye

Classifications

• G06F2203/04103

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

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• H01L51/56

  Electricity · mapped topic

• H01L27/323 Primary

  Electricity · mapped topic

• H01L27/3244

  Electricity · mapped topic