Double-emission organic light emitting diode display device

• US 8,138,669 B2
• Filed: 01/29/2009
• Issued: 03/20/2012
• Est. Priority Date: 07/17/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Eun-Ah
• Primary Examiner(s): MACCHIAROLO, PETER J
• Application Number:
  US12/361,916
• Publication Number:
  US 20100013380A1
• Time in Patent Office: 1,146 Days
• Field of Search: 313/505
• US Class Current: 313/505
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 59/128 comprising two independent displays, e.g. for emitting information from two major sides of the display
• CPC Class Codes: H10K 59/90 Assemblies of multiple devices comprising at least one organic light-emitting element
• CPC Class Codes: Y02E 10/549 Organic PV cells

Abstract

A double-emission organic light emitting diode (OLED) display device to display images on both sides includes two substrates each having an independently-drivable OLED bonded to each other to prevent breakage due to external pressure and decrease power consumption. The OLED display device includes a first substrate, a first OLED disposed on the first substrate and having at least one first emission layer, a conductive layer disposed on the first OLED, a second OLED disposed on the conductive layer and having at least one second emission layer, and a second substrate disposed on the second OLED. Alternatively, the OLED display device includes a sealant disposed along edges of the first and second substrates to bond the first substrate to the second substrate, and a conductive filler disposed between the first and second substrates.

Claims

1. A double-emission organic light emitting diode (OLED) display device, comprising:

a first substrate having a first display region for displaying a first image and a first interconnection region;

a first OLED disposed on the first substrate and having at least one first emission layer;

a conductive layer disposed on the first OLED;

a second OLED disposed on the conductive layer and having at least one second emission layer; and

a second substrate disposed on the second OLED, the second substrate having a second display region for displaying a second image and a second interconnection region.

2. The OLED display device of claim 1, wherein

the first OLED comprises:

a first lower electrode disposed between the first substrate and the first emission layer, and

a first upper electrode disposed between the first emission layer and the conductive layer; and

the second OLED comprises;

a second lower electrode disposed between the second substrate and the second emission layer, and

a second upper electrode disposed between the second emission layer and the conductive layer;

wherein the first and second upper electrodes are electrically connected to the conductive layer.

3. The OLED display device of claim 2, wherein the first and second upper electrodes are formed of a same material.

4. The OLED display device of claim 2, further comprising:

at least one thin film transistor disposed between the first substrate and the first lower electrode and/or between the second substrate and the second lower electrode.

5. The OLED display device of claim 1, wherein the first and second OLEDs each comprise at least one emission region, and the emission region of the first OLED overlaps with the emission region of the second OLED.

6. The OLED display device of claim 1, wherein the conductive layer is formed of a solid conductive film.

7. The OLED display device of claim 6, wherein the solid conductive film comprises an anisotropic conductive film (ACF).

8. The OLED display device of claim 1, wherein the conductive layer is formed of a paste comprising metal powder.

9. The OLED display device of claim 1, wherein the first OLED is driveable independent of the second OLED.

10. A double-emission organic light emitting diode (OLED) display device, comprising:

a first substrate comprising a first OLED having at least one first emission layer, the first substrate having a first display region for displaying a first image and a first interconnection region;

a second substrate bonded to the first substrate and comprising a second OLED having at least one second emission layer, the second substrate having a second display region for displaying a second image independent of the first image and a second interconnection region;

a sealant disposed along edges of the first and second substrates to bind the first substrate to the second substrate; and

a conductive filler disposed between the emission layers of the first and second substrates.

11. The OLED display device of claim 10, wherein

the first OLED comprises:

a first lower electrode disposed between the first substrate and the first emission layer, and

a first upper electrode disposed between the first emission layer and the conductive filler; and

the second OLED comprises;

a second lower electrode disposed between the second substrate and the second emission layer, and

a second upper electrode disposed between the second emission layer and the conductive filler;

wherein the first and second upper electrodes are in contact with the conductive filler.

12. The OLED display device of claim 11, wherein the first and second upper electrodes are formed of a same material.

13. The OLED display device of claim 11, further comprising:

at least one thin film transistor disposed between the first substrate and the first lower electrode and/or between the second substrate and the second lower electrode.

14. The OLED display device of claim 10, further comprising:

a first interconnection disposed on the first interconnection region of the first substrate, between the sealant and the first OLED;

a second interconnection disposed on the second interconnection region of the second Substrate, between the sealant and the second OLED;

a first interconnection insulating layer disposed between the first interconnection and the conductive filler; and

a second interconnection insulating layer disposed between the second interconnection and the conductive filler.

15. The OLED display device of claim 14, further comprising:

a first thin film transistor disposed between the first substrate and the first OLED; and

a second thin film transistor disposed between the second substrate and the second OLED,

wherein the first and second interconnections are formed of the same material one of a semiconductor layer, a gate electrode, a source electrode, a drain electrode of the thin film transistor, and a combination thereof.

16. The OLED display device of claim 14, wherein each interconnection insulating layer is one selected from a group consisting of a gate insulating layer and an interlayer insulating layer of the thin film transistor, a passivation layer disposed on the thin film transistor, and a combination thereof.

17. The OLED display device of claim 14, further comprising:

first and second absorption layers disposed between the first and second interconnection insulating layers and the conductive filler, respectively.

18. The OLED display device of claim 10, wherein the conductive filler comprises a metal powder.

19. The OLED display device of claim 10, wherein the conductive filler comprises an anisotropic conductive film.

20. The OLED display device of claim 10, wherein the first and second OLEDs each comprise at least one emission region, and the emission region of the first OLED overlaps the emission region of the second OLED.

21. A double-emission organic light emitting diode (OLED) display device, comprising:

first and second substrates coupled together, each of the first and second substrates having disposed thereon an OLED having a first electrode connected to a thin film transistor, a second electrode, and an emission layer disposed between the first and second electrodes of the OLED;

the first substrate having a first display region for displaying a first image and a first interconnection region; and

the second substrate having a second display region for displaying a second image independent of the first image and a second interconnection region,

wherein the second electrodes are electrically connected to each other.

22. The OLED display device of claim 21, further comprising:

a conductive filler to electrically connect the second electrodes.

23. The OLED display device of claim 22, wherein the conductive filler comprises a metal powder.

24. The OLED display device of claim 22, wherein the conductive filler comprises an anisotropic conductive film.