Organic Light Emitting Diode Display Device

• US 20150144902A1
• Filed: 07/29/2014
• Published: 05/28/2015
• Est. Priority Date: 11/28/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: DO, Eui-Doo, KIM, Min-Ki
• Granted Patent: US 9,111,888 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 50/824 combined with auxiliary electrodes
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/1315 comprising structures specially adapted for lowering the resistance
• CPC Class Codes: H10K 59/80522 combined with auxiliary electrodes

Abstract

An organic light emitting diode display device includes: a reflective electrode and an auxiliary electrode; a bank layer on the reflective electrode and the auxiliary electrode, the bank layer including a first open portion and a second open portion exposing a portion of the reflective electrode and a portion of the auxiliary electrode, respectively; a separator on the auxiliary electrode, the separator disposed within the second open portion; a pixel electrode in contact with the portion of the reflective electrode exposed by the first open portion of the bank layer, the pixel electrode being disposed separated from the separator; an organic emission layer on the pixel electrode, the organic emission layer divided by the separator, the organic emission layer being disposed separated from the separator; and a common electrode on the organic emission layer, the common electrode connected to the auxiliary electrode.

Claims

1. An organic light emitting diode display device, comprising:

a reflective electrode;

an auxiliary electrode;

a bank layer on the reflective electrode and the auxiliary electrode, the bank layer including a first open portion and a second open portion exposing a portion of the reflective electrode and a portion of the auxiliary electrode, respectively;

a separator on the auxiliary electrode, the separator disposed within the second open portion;

a pixel electrode in contact with the portion of the reflective electrode exposed by the first open portion of the bank layer, the pixel electrode being disposed separated from the separator;

an organic emission layer on the pixel electrode, the organic emission layer divided by the separator, the organic emission layer being disposed separated from the separator; and

a common electrode on the organic emission layer, the common electrode connected to the auxiliary electrode.

2. The organic light emitting diode display device according to claim 1, further comprising a thin film transistor on a substrate, wherein the reflective electrode is connected to the thin film transistor.

3. The organic light emitting diode display device according to claim 1, wherein the reflective electrode and the auxiliary electrode are coplanar within the display device, the reflective electrode and the auxiliary electrode fabricated from a same material.

4. The organic light emitting diode display device according to claim 1, wherein the auxiliary electrode is fabricated from a same material as the pixel electrode.

5. The organic light emitting diode display device according to claim 1, wherein the auxiliary electrode is fabricated from a same material as the reflective electrode.

6. The organic light emitting diode display device according to claim 1, wherein the reflective electrode is in contact with a driving transistor.

7. The organic light emitting diode display device according to claim 1, wherein the pixel electrode is in contact with a driving transistor.

8. The organic light emitting diode display device according to claim 1, wherein the separator has a reverse tapered shape that is narrower at a bottom than at a top.

9. The organic light emitting diode display device according to claim 1, wherein a work function of the common electrode is greater than a work function of the pixel electrode.

10. The organic light emitting diode display device according to claim 1, wherein a low level voltage is supplied to the pixel electrode and a high level voltage is supplied to the common electrode.

11. The organic light emitting diode display device according to claim 1, wherein the common electrode is connected to the portion of the auxiliary electrode exposed by the second opening between the separator and the bank layer.

12. The organic light emitting diode display device according to claim 1, wherein the pixel electrode includes a metal layer contacting the organic emission layer.

13. The organic light emitting diode display device according to claim 1, wherein the common electrode includes a conductive oxide layer contacting the organic emission layer.

14. An organic light emitting diode display device, comprising:

a pixel electrode;

an auxiliary electrode;

a bank layer on the pixel electrode and the auxiliary electrode, the bank layer including a first open portion and a second open portion exposing a portion of the pixel electrode and a portion of the auxiliary electrode, respectively;

a separator in contact with the auxiliary electrode, the separator disposed within the second open portion;

an organic emission layer in contact with the pixel electrode at the first open portion, the organic emission layer being disposed separated from the separator; and

a common electrode on the organic emission layer, the common electrode connected to the auxiliary electrode.

15. The organic light emitting diode display device according to claim 14, further comprising a reflective electrode under the pixel electrode.

16. The organic light emitting diode display device according to claim 15, further comprising a thin film transistor on a substrate, wherein one of the pixel electrode and the reflective electrode is connected to the thin film transistor.

17. The organic light emitting diode display device according to claim 15, wherein one of the pixel electrode and the reflective electrode is coplanar with the auxiliary electrode within the display device.

18. The organic light emitting diode display device according to claim 15, wherein one of the pixel electrode and the reflective electrode is fabricated from a same material as the auxiliary electrode.

19. The organic light emitting diode display device according to claim 15, wherein the auxiliary electrodes includes a lower layer and an upper layer on the lower layer, wherein the reflective layer and the lower layer are at a first same layer within the display device and fabricated from a same first material as each other, and wherein the pixel electrode and the upper layer are at a second same layer within the display device and fabricated from a same second material as each other.

20. The organic light emitting diode display device according to claim 14 wherein the separator has a reverse taper shape.

21. The organic light emitting diode display device according to claim 14, wherein a work function of the common electrode is greater than a work function of the pixel electrode.

22. An organic light emitting diode display device, comprising:

a pixel electrode;

an auxiliary electrode;

a bank layer over both of the pixel electrode and the auxiliary electrode, the bank layer defining;

a first opening exposing a portion of the pixel electrode;

a second opening exposing a portion of the auxiliary electrode;

an organic emission layer in contact with the pixel electrode in the first opening; and

a common electrode over the organic emission layer and in contact with the auxiliary electrode in the second opening, the auxiliary electrode reducing an electrical resistance of the common electrode.

23. The organic light emitting diode display device of claim 22, further comprising a separator disposed in the second opening between the auxiliary electrode and the common electrode, the common electrode connected to the auxiliary electrode between the separator and the bank layer.

24. The organic light emitting diode display device of claim 22, wherein the organic emission layer is disposed in contact with the auxiliary electrode in the second opening.

25. The organic light emitting diode display device of claim 22, further comprising a reflective electrode in contact with the pixel electrode on a side opposite the organic emission layer.

26. The organic light emitting diode display device of claim 25, wherein the auxiliary electrode and the reflective electrode are coplanar.