Organic light emitting display device and method for fabricating the same

• US 20090315450A1
• Filed: 12/18/2008
• Published: 12/24/2009
• Est. Priority Date: 06/24/2008
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Hyung Chul, Lee, Jun Ho, Oh, Kyung Tak, Kim, Dong Hwan, Yang, Mi Youn
• Granted Patent: US 7,973,475 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/874 including getter material or desiccant

Abstract

An OLED device and a method for fabricating the same are disclosed, capable of improving yield and preventing decomposition of organic layers by moisture. An organic passivation layer having excellent morphology is applied to prevent a short circuit between an anode electrode and a cathode electrode. A Ca layer is applied to remove moisture from the inside of the device, thereby increasing the lifespan of the device. Accordingly, generation of dark sports by the short circuit caused by protrusions on a poor-morphology layer can be prevented. In addition, moisture absorbent layers are formed between the passivation layers and the partitions to remove outside moisture and the moisture outgassed from the inside, that is, partitions and organic layers, thereby elongating the lifespan of the OLED device.

Claims

1. An organic light emitting display (OLED) device comprising:

a substrate divided into a plurality of pixel regions and a plurality of non-pixel regions excluding the pixel regions;

thin film transistors (TFT) on the substrate to drive respective pixel regions;

an organic passivation layer on an entire surface of the substrate including the TFTs;

first electrodes on the organic passivation layer to connect to the respective TFTs;

partitions on the organic passivation layer in the non-pixel regions to define the respective pixel regions;

organic emission layers formed on the respective first electrodes;

a second electrode on an entire surface of the substrate including the organic emission layers; and

first moisture absorbent layers formed between the respective partitions and the organic passivation layer.

2. The OLED device according to claim 1, further comprising a second moisture absorbent layer on the second electrode.

3. The OLED device according to claim 2, wherein the second moisture absorbent layer comprises Ca.

4. The OLED device according to claim 1, wherein the first moisture absorbent layer comprises Ca.

5. The OLED device according to claim 1, wherein the first moisture absorbent layer is at an interval from the first electrode.

6. The OLED device according to claim 1, wherein the first moisture absorbent layer is partly overlapped with the first electrode.

7. A method for fabricating an OLED device comprising:

preparing a substrate divided into pixel regions and non-pixel regions;

forming thin film transistors on the substrate;

forming an organic passivation layer on an entire surface of the substrate including the thin film transistors;

forming contact holes in the organic passivation layer to expose drain electrodes of the thin film transistors;

forming first electrodes on the organic passivation layer of the pixel regions to contact the drain electrodes through the contact holes;

forming first moisture absorbent layers on the organic passivation layer of the non-pixel regions;

forming partitions in the non-pixel regions to cover the first moisture absorbent layers;

forming organic emission layers on the first electrodes; and

forming a second electrode on the an entire surface of the substrate including the organic emission layers.

8. The fabricating method according to claim 7, further comprising forming a second moisture absorbent layer on the second electrode.

9. The fabricating method according to claim 8, wherein the second moisture absorbent layer comprises Ca.

10. The fabricating method according to claim 7, wherein the first moisture absorbent layer comprises Ca.

11. The fabricating method according to claim 7, wherein the first moisture absorbent layer is at an interval from the first electrode.

12. The fabricating method according to claim 7, wherein the first moisture absorbent layer is partially overlapped with the first electrode.