TRANSPARENT ORGANIC LIGHT EMITTING DISPLAY DEVICE AND METHOD FOR MANUFACTURING THE SAME

• US 20140183479A1
• Filed: 12/10/2013
• Published: 07/03/2014
• Est. Priority Date: 12/28/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: KIM, Binn, PARK, SungHee, KIM, JongMoo
• Granted Patent: US 9,093,669 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 50/824 combined with auxiliary electrodes
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/1315 comprising structures specially adapted for lowering the resistance
• CPC Class Codes: H10K 59/352 the areas of the RGB subpixels being different
• CPC Class Codes: H10K 59/353 characterised by the geometrical arrangement of the RGB subpixels
• CPC Class Codes: H10K 59/80522 combined with auxiliary electrodes
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

Provided are an organic light emitting display device and a method for manufacturing the same. The organic light emitting display device includes a plurality of pixels, each including a set of sub pixels. Each of the sub pixels has an emissive area for emitting light and a transmissive area for passing the external light. At least two sub pixels are symmetrically arranged on each side of an auxiliary electrode, and share the auxiliary electrode.

Claims

1. A transparent organic light emitting display device, comprising:

a plurality of sub pixels, each of the sub pixels including a first area associated with a first function of the sub-pixel and a second area associated with a second function of the sub-pixel; and

a plurality of auxiliary electrodes electrically connected to at least some of the plurality of sub pixels via a conductive element, wherein said at least some of the plurality of sub pixels includes a first sub pixel and a second sub pixel, and

wherein an auxiliary electrode is disposed between the first sub-pixel and the second sub-pixel such that the auxiliary electrode is closer to a first area of the first sub-pixel and a first area of the second sub-pixel than a second area of the first sub-pixel and a second area of the second sub-pixel.

2. The transparent organic light emitting display device of claim 1, wherein the first function is to emit light for displaying of an image and the second function is to transmit external light.

3. The transparent organic light emitting display device of claim 2, wherein the first sub-pixel and the second sub-pixel each include an organic emission layer, the organic emission layer of the first sub-pixel and the conductive element not formed in the second area of the first sub-pixel, and the organic emission layer of the second sub-pixel and the conductive element not formed in the second area of the second sub-pixel.

4. The transparent organic light emitting display device of claim 1, further comprising:

a partition disposed directly on the auxiliary electrode, areas of the auxiliary electrode not in direct contact with the partition including an exposed remaining part of the auxiliary electrode; and

wherein the conductive element includes a transparent conductive layer, a cathode of the first sub-pixel, and a cathode of the second sub-pixel, the transparent conductive layer covering the partition and in contact with the auxiliary electrode, the cathode of the first sub-pixel and the cathode of the second sub pixel.

5. The transparent organic light emitting display device of claim 1, wherein the first function is to transmit external light and the second function is to emit light for displaying of an image.

6. The transparent organic light emitting display device of claim 5, wherein the conductive element includes a transparent conductive layer, a cathode of the first sub-pixel, and a cathode of the second sub-pixel, the transparent conductive layer covering the auxiliary electrode, the cathode of the first sub-pixel, and the cathode of the second sub pixel, wherein the cathode of the first sub-pixel and the cathode of the second sub-pixel are not formed in the first area of the first sub-pixel and the first area of the second sub-pixel.

7. The transparent organic light emitting display device of claim 1, wherein the auxiliary electrode is made of a same material as an anode of the first sub-pixel and an anode of the second sub-pixel, the auxiliary electrode formed on a same plane as the anode of the first sub-pixel and the anode of the second sub-pixel on the substrate.

8. The transparent organic light emitting display device of claim 1, wherein the auxiliary electrode comprises a first conductive layer including a transparent material formed on a second conductive layer including a reflective material or the auxiliary comprises the second conductive layer.

9. The transparent organic light emitting display device of claim 4, further comprising:

a plurality of banks including at least a first bank between an anode of the first sub pixel and the auxiliary electrode, and a second bank between an anode of the second sub pixel and the auxiliary electrode.

10. A transparent organic light emitting display device, comprising:

a plurality of sub pixels, each of the sub pixels including an emissive area and a transmissive area; and

a plurality of auxiliary electrodes electrically connected to conductive element of at least some of the plurality of sub pixels, wherein said at least some of the plurality of sub pixels includes a first sub pixel and a second sub pixel that are symmetrically arranged to each other relative to the auxiliary electrode.

11. The transparent organic light emitting display device of claim 10, wherein an auxiliary electrode is disposed between the first sub-pixel and the second sub-pixel such that the auxiliary electrode is closer to an emissive area of the first sub-pixel and an emissive area of the second sub-pixel than a transmissive area of the first sub-pixel and a transmissive area of the second sub-pixel.

12. The transparent organic light emitting display device of claim 10, wherein an auxiliary electrode is disposed between the first sub-pixel and the second sub-pixel such that the auxiliary electrode is closer to a transmissive area of the first sub-pixel and a transmissive area of the second sub-pixel than an emissive area of the first sub-pixel and an emissive area of the second sub-pixel.

13. The transparent organic light emitting display device of claim 10, wherein the plurality of auxiliary electrodes is arranged to extend in a first direction, and wherein at least two sub pixels are disposed between two adjacent auxiliary electrodes in which said at least two sub pixels are arranged in a second direction substantially perpendicular to the first direction.

14. A transparent organic light emitting display device, comprising:

an auxiliary electrode including a first side and a second side, the auxiliary electrode extending in a first direction; and

a first pixel including a first plurality of sub-pixels disposed on the first side of the auxiliary electrode;

a second pixel including a second plurality of sub-pixels disposed on the second side of the auxiliary electrode;

wherein at least one of the first plurality of sub-pixels of the first pixel is connected to the auxiliary electrode and at least one of the second plurality of sub-pixels of the second pixel is connected to the auxiliary electrode; and

wherein at least one of the first plurality of sub-pixels of the first pixel is not connected to the auxiliary electrode and at least one of the second plurality of sub-pixels of the second pixel is not connected to the auxiliary electrode.

15. The transparent organic light emitting display device of claim 14, wherein:

the first plurality of sub-pixels each include a first area associated with a first function and a second area associated with a second function; and

the second plurality of pixels each include a first area associated with the first function and a second area associated with the second function.

16. The transparent organic light emitting display device of claim 14, wherein the at least one sub pixel of the first pixel that is in contact with the auxiliary electrode is smaller in size than the other first plurality of sub-pixels that are not in contact with the auxiliary electrode and the at least one sub pixel of the second pixel that is in contact with the auxiliary electrode is smaller in size than the other second plurality of sub-pixels that are not in contact with the auxiliary electrode.

17. The transparent organic light emitting display device of claim 15, wherein a portion of the auxiliary electrode in contact with the at least one sub pixel of the first pixel and the at least one sub-pixel of the second pixel is larger than other portions of the auxiliary electrode not in contact with one sub-pixel of the first pixel and one sub-pixel of the second pixel.

18. The transparent organic light emitting display device of claim 15, wherein the at least one of the first plurality of sub-pixels connected to the auxiliary electrode and the at least one of the second plurality of sub-pixels connected to the auxiliary electrode emit light of a same color.

19. The transparent organic light emitting display device of claim 18, wherein the light of the same color is green.

20. The transparent organic light emitting display device of claim 14, further comprising:

a partition disposed on the auxiliary electrode between the one of the first plurality of sub-pixels connected to the auxiliary electrode and the one of the second plurality of sub-pixels connected to the auxiliary electrode; and

a conductive element formed over the partition, the at least one of the first plurality of sub-pixels of the first pixel and the at least one of the second plurality of sub-pixels of the second pixel connected to the auxiliary electrode via the conductive element.

21. A method for manufacturing a transparent organic light emitting display device, comprising:

forming a plurality of auxiliary electrodes and a plurality of anodes such that at least one auxiliary electrode is formed between an anode of a first sub pixel and an anode of a second sub pixel that are symmetrically formed relative to the auxiliary electrode;

forming a first bank and a second bank, in which the first bank is formed between the anode of the first sub pixel and the auxiliary electrode, and the second bank is formed between the anode of the second sub pixel and the auxiliary electrode;

forming an organic emission layer such that the organic emission layer is on the first and second sub pixels; and

forming a cathode such that the cathode is in the first and second sub pixels.

22. The method for manufacturing a transparent organic light emitting display device of claim 21, wherein the auxiliary electrode is made a first conductive layer including a transparent material, a second conductive layer including a reflective material or a stack of the first and second conductive layers, and wherein the anode is made of the stack of the first and second conductive layers.

23. The method for manufacturing a transparent organic light emitting display device of claim 21, further comprising:

forming a transparent conductive layer such that the transparent conductive layer is in contact with the cathode in the first sub pixel, the auxiliary electrode, and the cathode in the second sub pixel.

24. The method for manufacturing a transparent organic light emitting display device of claim 23, further comprising:

forming a partition on at least some of the auxiliary electrodes to expose at least some portion of the auxiliary electrode; and

such that the transparent conductive forming a transparent conductive layer layer is in contact with the cathode in the first sub pixel, the auxiliary electrode, and the cathode in the second sub pixel.