Organic electroluminescent display device

• US 20060097263A1
• Filed: 10/31/2005
• Published: 05/11/2006
• Est. Priority Date: 11/11/2004
• 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, Jae-Jung, Min, Kyoung-Wook, Park, Joon-Young, Lee, Jeong-Yeol
• Granted Patent: US 7,531,834 B2
• Time in Patent Office: Days
• US Class Current: 257/72
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks

Abstract

An organic electroluminescent display device (OELD) that prevents particles from creating blind spots by forming a recess or a groove in the surface of an insulating layer that covers edges of a pixel electrode. The OELD includes a lower electrode arranged on a substrate, an insulating layer arranged on the substrate, the insulating layer having an aperture adapted to expose a portion of the lower electrode, an organic layer arranged on the exposed portion of the lower electrode, and an upper electrode arranged on the substrate, wherein the insulating layer includes a recess and/or a groove in its surface.

Claims

1. An organic electroluminescent display device (OELD), comprising:

a lower electrode arranged on a substrate;

an insulating layer arranged on the substrate, the insulating layer having an aperture adapted to expose a portion of the lower electrode, the insulating layer also having a recess arranged in a surface thereof;

an organic layer arranged on the exposed portion of the lower electrode exposed by the aperture; and

an upper electrode arranged on the organic layer.

2. The OELD of claim 1, wherein the insulating layer is selected from the group consisting of a pixel definition layer, a planarization layer, and a protection layer.

3. The OELD of claim 1, wherein the recess is arranged in a part of the surface of the insulating layer adjacent to edges of the aperture.

4. The OELD of claim 1, wherein the recess is arranged in an entire surface ofthe insulating layer except at edges of the aperture.

5. The OELD of claim 1, wherein the recess is produced by a process comprising scratching the surface of the insulating layer.

6. The OELD of claim 1, wherein the recess is produced by a process comprising brushing the surface of the insulating layer.

12. The OELD of claim 1, wherein the groove is produced by a process comprising brushing the surface of the insulating layer.

7. An organic electroluminescent display device (OELD), comprising:

a lower electrode arranged on a substrate;

an insulating layer arranged on the substrate, the insulating layer having an aperture adapted to expose a portion of the lower electrode, the insulating layer also having a groove arranged in a surface thereof;

an organic layer arranged on the exposed portion of the lower electrode; and

an upper electrode arranged on the organic layer.

8. The OELD of claim 7, wherein the insulating layer is selected from the group consisting of a pixel definition layer, a planarization layer, and a protection layer.

9. The OELD of claim 7, wherein the groove is arranged in a part of the surface of the insulating layer adjacent to edges of the aperture.

10. The OELD of claim 7, wherein the groove is formed in an entire surface of the insulating layer except at edges of the aperture.

11. The OELD of claim 7, wherein the groove is produced by a process comprising scratching the surface of the insulating layer.

13. An organic electroluminescent display device (OELD), comprising:

a thin film transistor arranged on a substrate, the thin film transistor including at least a source electrode and a drain electrode;

a first insulating layer arranged on the substrate, the first insulating layer having an aperture adapted to expose one of the source electrode and drain electrode of the thin film transistor;

a pixel electrode arranged on the first insulating layer and connected to one of the source electrode and drain electrode via the aperture in the first insulating layer;

a second insulting layer arranged on the first insulating layer and including an aperture adapted to expose a portion of the pixel electrode, wherein the second insulating layer further includes a recess arranged in a surface thereof;

an organic layer arranged on the exposed portion of the pixel electrode; and

an upper electrode arranged on the organic layer.

14. The OELD of claim 13, wherein the first insulating layer is one of a protection layer and a planarization layer, and the second insulating layer comprises a pixel definition layer.

15. The OELD of claim 13, wherein the recess is produced by a process selected from the group consisting of scratching the surface of the second insulating layer and brushing the surface of the second insulating layer.

16. An organic electroluminescent display device (OELD), comprising:

a thin film transistor arranged on a substrate, the thin film transistor including at least a source electrode and a drain electrode;

a first insulating layer arranged on the substrate, the first insulating layer having an aperture adapted to expose one of the source electrode and drain electrode of the thin film transistor;

a pixel electrode arranged on the first insulating layer and connected to one of the source electrode and drain electrode via the aperture in the first insulating layer;

a second insulting layer arranged on the first insulating layer and having an aperture adapted to expose a portion of the pixel electrode, wherein the second insulating layer further includes a groove arranged in a surface thereof;

an organic layer arranged on the exposed portion of the pixel electrode; and

an upper electrode arranged on the organic layer.

17. The OELD of claim 16, wherein the first insulating layer is one of a protection layer and a planarization layer, and the second insulating layer comprises a pixel definition layer.

18. The OELD of claim 16, wherein the groove is produced by a process selected from the group consisting of scratching the surface ofthe second insulating layer and brushing the surface of the second insulating layer.