Organic light-emitting display device and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9293515-B2
Application number	US-201414173178-A
Country	US
Kind code	B2
Filing date	Feb 5, 2014
Priority date	Sep 13, 2013
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

An organic light-emitting display device and a method of manufacturing the organic light-emitting display device. The organic light-emitting display device is a dual emission display capable of displaying differing images on either side of the display, and includes a facing electrode that is selectively deposited in the first area but not in the second area, the selectivity being brought about by a varying an underlying material having differing adhesive forces with the material of the facing electrode. In addition, the underlying materials of the facing electrode and other intermediate layers of the organic light emitting diode device provide extra distance between the organic light emitting layer and a reflective electrode, so that exciton quenching is reduced, resulting in improved light emitting efficiency.

First claim

What is claimed is:

1. An organic light-emitting display (OLED) device, comprising:
a plurality of pixels, each of the pixels including a first area in which light is emitted from the display device in a first direction and not in a second direction opposite to the first direction, a second area in which light is emitted from the display device in the second direction and not in the first direction and a third area that is transparent to external light;
a plurality of first electrodes arranged within the first area of each of the plurality of pixels;
a plurality of second electrodes arranged within the second area of each of the plurality of pixels;
an intermediate layer arranged on the plurality of first electrodes and the plurality of second electrodes, the intermediate layer including an organic emitting layer;
a third electrode arranged on the intermediate layer and within both the first area and the second area;
a first auxiliary layer arranged on the third electrode within the first area;
a second auxiliary layer arranged on the third electrode within the second area; and
at least one fourth electrode arranged on the first auxiliary layer within the first area, the first auxiliary layer being interposed between the fourth electrode and the third electrode.

2. The OLED device of claim 1 , wherein the fourth electrode is absent from the second area and the third area.

3. The OLED device of claim 1 , wherein a portion of the fourth electrode is arranged within the second area and the third area, and a thickness of the portion of the fourth electrode arranged within the second area and the third area is less than a thickness of a portion of the fourth electrode arranged within the first area.

4. The OLED device of claim 3 , wherein the portion of the fourth electrode arranged within the second area is arranged on the second auxiliary layer.

5. An organic light-emitting display (OLED) device, comprising:
a plurality of pixels, each of the pixels including a first area in which light is emitted from the display device in a first direction and not in a second direction opposite to the first direction, a second area in which light is emitted from the display device in the second direction and not in the first direction and a third area that is transparent to external light;
a plurality of first electrodes arranged within the first area of each of the plurality of pixels;
a plurality of second electrodes arranged within the second area of each of the plurality of pixels;
an intermediate layer arranged on the plurality of first electrodes and the plurality of second electrodes, the intermediate layer including an organic emitting layer;
a third electrode arranged on the intermediate layer and within both the first area and the second area;
a first auxiliary layer arranged on the third electrode within the first area;
a second auxiliary layer arranged on the third electrode within the second area; and
a fourth electrode arranged on the first auxiliary layer within the first area, wherein the first auxiliary layer is absent from the second area and the third area.

6. The OLED device of claim 5 , wherein the second auxiliary layer is absent from the first area.

7. The OLED device of claim 5 , wherein a portion of the second auxiliary layer is arranged within the first area, and the first auxiliary layer is arranged on the portion of the second auxiliary layer arranged within the first area.

8. The OLED device of claim 1 , wherein a portion of the first auxiliary layer is arranged within the second area, and the second auxiliary layer is arranged on the portion of the first auxiliary layer arranged within the second area.

9. The OLED device of claim 1 , wherein a thickness of the fourth electrode is greater than a thickness of the third electrode.

10. The OLED device of claim 1 , wherein an adhesive force of the fourth electrode with respect to the first auxiliary layer is greater than an adhesive force of the fourth electrode with respect to the second auxiliary layer.

11. The OLED device of claim 1 , wherein the first auxiliary layer is comprised of a material selected from a group consisting of di-tungsten tetra(hexahydropyrimidopyrimidine)), fullerene, lithium fluoride (LiF), ADN [9,10-di(2-naphthyl)anthracene] and Liq: 8-hydroxyquinolinolato-lithium.

12. The OLED device of claim 1 , wherein the second auxiliary layer is comprised of a material selected from a group consisting of N,N′-diphenyl-N,N′-bis(9-phenyl-9H-carbazol-3-yl)biphenyl-4,4′-diamine, N(diphenyl-4-yl)9,9-dimethyl-N-(4(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, 2-(4-(9,10-di(naphthalene-2-yl)anthracene-2-yl)phenyl)-1-phenyl-1H-benzo-[D]imidazole, α-NPD (N,N′-bis(1-naphthyl)-N,N-diphenyl[1,1′-biphenyl]-4,4′-diamine) and TPD [4,4′-Bis[N-(3-methylphenyl)-N-phenylamino]biphenyl].

13. The OLED device of claim 1 , wherein the intermediate layer is further comprised of:
a first intermediate layer interposed between the organic emitting layer and the first and the second electrodes and including at least one of a hole injection layer and a hole transport layer; and
a second intermediate layer interposed between the organic light emitting layer and the third electrode, the second intermediate layer including at least one of an electron injection layer and an electron transport layer, wherein the first intermediate layer is thicker than the second intermediate layer.

14. The OLED device of claim 1 , wherein the OLED device is produced by a process comprising:
defining the plurality of pixels;
forming the plurality of first electrodes within the first area of each of the plurality of pixels;
forming the plurality of second electrodes within the second area of each of the plurality of pixels;
forming the intermediate layer on the plurality of first electrodes and on the plurality of second electrodes;
forming the third electrode on the intermediate layer within both the first area and the second area of each of the pixels by depositing a metal for forming the third electrode;
forming the first auxiliary layer on the third electrode within the first area;
forming the second auxiliary layer on the third electrode within the second area; and
forming the fourth electrode within the first area via a vacuum deposition technique by applying a vapor that includes a metal for forming the fourth electrode to a top surface of the first auxiliary layer within the first area and a top surface of the second auxiliary layer within the second area of each pixel.

15. The OLED device of claim 1 , wherein the second auxiliary layer is absent from the first area.

16. The OLED device of claim 1 , wherein a portion of the second auxiliary layer is arranged within the first area of each of the pixels, and the first auxiliary layer is arranged on the portion of the second auxiliary layer arranged within the first area of each of the pixels.

17. The OLED device of claim 1 , the fourth electrode is spaced-apart from the third electrode by at least the first auxiliary layer, the fourth electrode is electrically connected to the third electrode at a location external to the first and the second areas.

18. The OLED device of claim 1 , the first and the second auxiliary layers being distinguished from the intermediate layer and being spaced-apart from the intermediate layer by at least the third electrode.

19. The OLED device of claim 1 , the intermediate layer within the first area is spaced apart from the fourth electrode by at least the third electrode and the first auxiliary

Assignees

• Samsung Display Co Ltd

Inventors

• Choi Jun-Ho
• Chung Jin-Koo
• Cho Kwan-Hyun

Classifications

• H10K2102/101

  comprising transparent conductive oxides [TCO] · CPC title

• H10K2102/20

  Metallic electrodes, e.g. using a stack of layers · CPC title

• H10K59/35

  comprising red-green-blue [RGB] subpixels · CPC title

• H10K71/621

  Providing a shape to conductive layers, e.g. patterning or selective deposition · CPC title

• H10K59/8052 Primary

  Cathodes · CPC title