See-through organic light emitting display device and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016149156-A1
Application number	US-201514919580-A
Country	US
Kind code	A1
Filing date	Oct 21, 2015
Priority date	Nov 25, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

A see-through organic light emitting display device including a light emitting region having a transparent anode, an organic light emitting layer, and a transparent cathode, and a see-through region having a transparent auxiliary electrode, which is configured to transmit external light. The transparent auxiliary electrode can be made from the same material as the transparent anode and separated from the transparent anode, and the transparent cathode extends into the see-through region so as to be electrically connected with the transparent auxiliary electrode.

First claim

What is claimed is:

1 . A see-through organic light emitting display device comprising:
a light emitting region including a transparent anode, an organic light emitting layer, and a transparent cathode; and a see-through region including a transparent auxiliary electrode configured to transmit external light, wherein the transparent auxiliary electrode includes a same material as the transparent anode and the transparent auxiliary electrode is separated from the transparent anode, and wherein the transparent cathode extends into the see-through region to electrically connect with the transparent auxiliary electrode.

2 . The see-through organic light emitting display device according to claim 1 , wherein the transparent anode, the transparent cathode, and the transparent auxiliary electrode are formed of a transparent conductive oxide, and
the transparent cathode is formed of a different material than the transparent anode and the transparent auxiliary electrode.

3 . The see-through organic light emitting display device according to claim 2 , wherein the transparent cathode is formed of a material configured to generate fewer foreign substances when compared to the transparent anode and the transparent auxiliary electrode.

4 . The see-through organic light emitting display device according to claim 3 , further comprising:
a transparent encapsulation layer including at least a first inorganic encapsulation layer, an organic layer, and a second inorganic encapsulation layer, wherein the transparent encapsulation layer is disposed on the transparent cathode and covers the light emitting region and the see-through region, and wherein the transparent encapsulation layer is configured to cover the light emitting region while allowing the see-through organic light emitting display device to be flexible.

5 . The see-through organic light emitting display device according to claim 1 , further comprising:
a partition wall disposed on the transparent auxiliary electrode, wherein the organic light emitting layer covers the see-through region, and the transparent cathode is formed of a material having a higher step coverage than the organic light emitting layer, and the transparent cathode is electrically connected with the transparent auxiliary electrode.

6 . The see-through organic light emitting display device according to claim 1 , further comprising:
a dielectric layer disposed under the transparent auxiliary electrode and the transparent anode; and a bottom transparent auxiliary electrode disposed under the dielectric layer, wherein the bottom transparent auxiliary electrode is electrically connected with the transparent auxiliary electrode through a contact hole formed in the dielectric layer, and an area of the bottom transparent auxiliary electrode is greater than an area of the transparent auxiliary electrode.

7 . The see-through organic light emitting display device according to claim 6 , wherein at least a portion of the bottom transparent auxiliary electrode is overlapped with the transparent anode, and
the bottom transparent auxiliary electrode is electrically insulated from the transparent anode by the dielectric layer.

8 . The see-through organic light emitting display device according to claim 1 , wherein the transparent auxiliary electrode is configured to cover a majority of the see-through region.

9 . The see-through organic light emitting display device according to claim 1 , further comprising:
a dielectric layer disposed under the transparent auxiliary electrode and the transparent anode; and an opaque auxiliary electrode disposed on the dielectric layer and electrically connected with transparent auxiliary electrode, wherein the opaque auxiliary electrode is disposed between the light emitting region and an adjacent light emitting region that is adjacent to the light emitting region.

10 . The see-through organic light emitting display device according to claim 9 , further comprising:
a data line arranged in the light emitting region, wherein the data line and the opaque auxiliary electrode cross each other.

11 . A see-through organic light emitting display device comprising:
a light emitting region including a reflection layer, a transparent anode, an organic light emitting layer, and a transparent cathode; and a see-through region including a transparent auxiliary electrode configured to pass external light through the see-through region, wherein the reflection layer is configured to reflect light emitted from the organic light emitting layer through the transparent cathode, and wherein the transparent cathode covers the light emitting region and the see-through region, and the transparent cathode is electrically connected with the transparent auxiliary electrode.

12 . The see-through organic light emitting display device according to claim 11 , further comprising:
a translucent cathode composed of a metallic material and disposed between the light emitting region and an adjacent light emitting region, wherein a work function of the translucent cathode is lower than a work function of the transparent cathode.

13 . The see-through organic light emitting display device according to claim 12 , wherein the translucent cathode has a first thickness and a second thickness,
the first thickness is smaller than the second thickness, a first portion of the translucent cathode having the first thickness is disposed in the light emitting region, and a second portion the translucent cathode having the second thickness is disposed between the light emitting region and the adjacent light emitting region.

14 . The see-through organic light emitting display device according to claim 13 , wherein the second thickness is twice as thick as the first thickness,
a transmissivity of a region corresponding to the first thickness is higher than a transmissivity of a region corresponding to the second thickness, and a resistance of the region corresponding to the second thickness is lower than a resistance of the region corresponding to the first thickness.

15 . The see-through organic light emitting display device according to claim 12 , wherein the translucent cathode is disposed between the organic light emitting layer and the transparent cathode.

16 . The see-through organic light emitting display device according to claim 12 , wherein the translucent cathode and the transparent auxiliary electrode are parallel to each other, and
the translucent cathode covers a majority of the light emitting region.

17 . The see-through organic light emitting display device according to claim 13 , wherein the translucent cathode and the transparent auxiliary electrode are separated from each other and electrically connected with each other by the transparent cathode.

18 . A method for manufacturing a see-through organic light emitting display device, the method comprising:
forming a transparent layer across the light emitting region and the see-through region on a substrate and patterning the transparent layer to form a transparent anode in a light emitting region and a transparent auxiliary electrode in a see-through region configured to pass external light through the see-through region, wherein the transparent auxiliary electrode is separated from the transparent anode; forming an organic light emitting layer on the transparent anode; and forming a transparent cathode electrically connected with the transparent auxiliary electrode in the see through region.

19 . The meth

Assignees

• Lg Display Co Ltd

Inventors

• Kim Hyoungsu
• Cho Namwook
• Park Jaehee
• Kim Euitae
• Lee Buyeol
• Lim Hyuntaek
• Son Junbae
• Yoo Myungjae
• Lee Jaemyon

Classifications

• H10K59/1315 Primary

  comprising structures specially adapted for lowering the resistance · CPC title

• H10K59/80524

  Transparent cathodes, e.g. comprising thin metal layers · CPC title

• H10K59/80522

  combined with auxiliary electrodes · CPC title

• H10K50/824

  combined with auxiliary electrodes · CPC title

• H10K59/121 Primary

  characterised by the geometry or disposition of pixel elements · CPC title