Organic light emitting display device and method of manufacturing the same

• US 7,915,613 B2
• Filed: 06/06/2007
• Issued: 03/29/2011
• Est. Priority Date: 12/20/2006
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Seung-Kyu
• Primary Examiner(s): Pham; Thanh V
• Assistant Examiner(s): Ligai; Maria
• Application Number:
  US11/758,976
• Publication Number:
  US 20080150417A1
• Time in Patent Office: 1,392 Days
• Field of Search: 257/59, 257/72, 257/E51.018, 257/E51.019, 257/E51.022, 438/158
• US Class Current: 257/59
• CPC Class Codes: H10K 50/813 characterised by their shape
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/80515 characterised by their shape

Abstract

Disclosed is an organic light emitting display device including a substrate having a plurality of sub-pixel areas, a switching thin film transistor formed on each of the sub-pixel areas, a driving thin film transistor connected to the switching thin film transistor, a color filter formed on at least one of sub-pixel areas, an insulating layer formed on the switching thin film transistor, the driving thin film transistor and the color filter, a pixel electrode connected to the driving thin film transistor, an organic light emitting member formed on the pixel electrode, and a common electrode formed on the organic light emitting member. The insulating layer has a groove. The groove is formed along a boundary of the pixel electrode. The groove has a width of about 0.2 to about 4 μm. The groove has a depth of about 0.2 to about 4 μm. The pixel electrode has an edge declined in the groove.

Claims

1. An organic light emitting display device comprising:

a substrate having a plurality of sub-pixel areas;

a switching thin film transistor formed on each of the sub-pixel areas, wherein the switching thin film transistor has a first control electrode, a first input electrode and a first output electrode;

a driving thin film transistor connected to the switching thin film transistor, wherein the driving thin film transistor has a second control electrode, a second input electrode and a second output electrode;

a color filter formed on at least one of sub-pixel areas;

an insulating layer formed on the switching thin film transistor and the driving thin film transistor, wherein the insulating layer has a groove and a contact hole;

a pixel electrode electrically connected to the driving thin film transistor through the contact hole, the pixel electrode extending to the groove to be partially contained in the groove;

wherein the pixel electrode has an edge declined in the groove;

a cover member covering the edge of the pixel electrode;

wherein the cover member comprises an organic material and a position of an upper surface of the cover member is substantially the same or is lower than a position of an upper surface of the pixel electrode;

an organic light emitting member formed on the pixel electrode; and

a common electrode formed on the organic light emitting member.

2. The device of claim 1, wherein the groove is formed along a boundary of the pixel electrode.

3. The device of claim 1, wherein the groove has a width of about 0.2 to about 4 μ

m.

4. The device of claim 1, wherein the groove has a depth of about 0.2 to about 4 μ

m.

5. The device of claim 1, wherein the sub-pixel areas comprises a red sub-pixel area, a green sub-pixel area, a blue sub-pixel area and a white sub-pixel area, and wherein the red sub-pixel area, the green sub-pixel area, the blue sub-pixel area and the white sub-pixel area form a pixel unit area.

6. The device of claim 1, wherein the first output electrode is in direct contact with the second control electrode.

7. The device of claim 1, wherein the groove has a depth that is less than a depth of the contact hole.

8. An organic light emitting display device comprising:

a substrate having a plurality of sub-pixel areas;

a switching thin film transistor formed on each of the sub-pixel areas;

a driving thin film transistor connected to the switching thin film transistor;

an insulating layer having a groove and a contact hole formed on the driving thin film transistor;

a pixel electrode connected to the driving thin film transistor;

wherein the pixel electrode has an edge declined in the groove;

a cover member covering the edge of the pixel electrode;

wherein the cover member comprises an organic material and a position of an upper surface of the cover member is substantially the same or is lower than a position of an upper surface of the pixel electrode;

an organic light emitting member disposed on the pixel electrode and the insulating layer to cover an entire upper surface of each of the pixel electrode and the insulating layer; and

a common electrode formed on the organic light emitting member.

9. The device of claim 8, wherein, the driving thin film transistor is electrically connected to the pixel electrode through the contact hole, and the pixel electrode extends to the groove to be partially contained in the groove.

10. The device of claim 9, wherein the groove is formed along a boundary of the pixel electrode.

11. The device of claim 9, wherein the groove has a depth that is less than a depth of the contact hole.

12. The device of claim 8, wherein the light emitting member comprises a hole injection layer, a hole transport layer, an organic light emitting layer, an electron injection layer and an electron transport layer.