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

Patent metadata

Field	Value
Publication number	US-10825873-B2
Application number	US-201916410749-A
Country	US
Kind code	B2
Filing date	May 13, 2019
Priority date	Aug 31, 2016
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

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 arranged on an active area of a substrate;
an encapsulation unit arranged on the light emitting elements, the encapsulation unit including a first encapsulation layer, a second encapsulation layer on the first encapsulation layer, and a third encapsulation layer on the second encapsulation layer;
touch sensors arranged on the encapsulation unit;
touch pads arranged on a pad area of the substrate and connected to the touch sensors;
routing lines provided to conductively connect the touch sensors to the touch pads;
at least one organic pattern arranged between the active area and the pad area; and
a compensation layer on the third encapsulation layer, the compensation layer arranged between the light emitting elements and the routing lines and overlapping at least a part of the at least one organic pattern,
wherein the compensation layer has different thicknesses between a region above the at least organic pattern and a region between the at least one organic pattern and the light emitting elements.

2. The organic light emitting display according to claim 1 , further comprising a plurality of color filters arranged between the touch sensors and the encapsulation unit,
wherein the compensation layer is formed to have a monolayer or multilayer structure using a 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 arranged between the touch sensors and the encapsulation unit so as to implement light of different colors; and
a black matrix arranged between the color filters,
wherein the compensation layer comprises:
a first compensation layer formed of a same material as the black matrix; and
a second compensation layer formed of a same material as at least one of the color filters and arranged on the first compensation layer.

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

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

6. The organic light emitting display according to claim 5 , wherein a thickness of the compensation layer, formed of the same film as at least one of the touch buffer film or the organic encapsulation layer of the encapsulation unit, in a region above at least one of the at least one organic pattern or the light emitting elements is less than a thickness of the compensation layer in the region between the at least one organic pattern and the light emitting elements.

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

8. The organic light emitting display according to claim 1 , further comprising:
a touch buffer film arranged between the touch sensors and the encapsulation unit;
a plurality of color filters arranged on the touch sensors; and
a black matrix arranged between the color filters,
wherein the compensation layer is formed of a same film as at least one of the color filters, the black matrix, the touch buffer film or an organic encapsulation layer of the encapsulation unit.

9. The organic light emitting display according to claim 8 , wherein a thickness of the compensation layer, formed of the same film as the at least one of the color filters, the black matrix, the touch buffer film or the organic encapsulation layer of the encapsulation unit, in a region above at least one of the at least one organic pattern or the light emitting elements is less than a thickness of the compensation layer in the region between the at least one organic pattern and the light emitting elements.

10. The organic light emitting display according to claim 1 , wherein the routing lines intersect the at least one organic pattern with the compensation layer interposed therebetween.

11. The organic light emitting display according to claim 10 , wherein the routing lines are arranged in the region above the at least one organic pattern and in the region between the at least one organic pattern and the light emitting elements.

12. The organic light emitting display according to claim 1 , wherein the routing lines are arranged so as to cover a side surface of the compensation layer.

13. The organic light emitting display according to claim 1 , wherein the routing lines contact the compensation layer, on the compensation layer.

14. The organic light emitting display according to claim 1 , wherein the touch sensors comprise:
first touch electrodes arranged in a first direction on the encapsulation unit and connected to each other through first bridges; and
second touch electrodes arranged in a second direction on the encapsulation unit and connected to each other through second bridges.

15. The organic light emitting display according to claim 14 , wherein at least one of the first touch electrodes or 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 touch electrodes or the second touch electrodes further includes a transparent conductive layer arranged on an upper and lower surface of the mesh metal film.

17. The organic light emitting display according to claim 15 , wherein:
at least one of the first bridges or the second bridges has slits.

18. The organic light emitting display according to claim 17 , wherein the slits of the at least one of the first bridges or the second bridges overlap the other of the first bridges and the second bridges.

19. The organic light emitting display according to claim 17 , 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 a group consisting of Al, Ti, Cu, and Mo.

20. The organic light emitting display according to claim 17 , wherein at least one of the first bridges or the second bridges is arranged at a position corresponding to a bank.

21. The organic light emitting display according to claim 20 , wherein the at least one organic pattern comprises a plurality of organic patterns arranged in parallel between the pad area and the active area.

22. The organic light emitting display according to claim 20 , further comprising at least one dam arranged between the substrate and the routing lines,
wherein the at least one organic pattern is formed of a same film as at least one of a planarization film, the at least one dam, the bank o

Assignees

• Lg Display Co Ltd

Inventors

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

Classifications

• H10K59/8731

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

• H10K59/8722

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F2203/04103

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

• H01L51/56

  Electricity · mapped topic