ORGANIC LIGHT-EMITTING DISPLAY AND METHOD OF MANUFACTURING THE SAME

• US 20120267670A1
• Filed: 09/23/2011
• Published: 10/25/2012
• Est. Priority Date: 04/22/2011
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, June-Woo, Huh, Jong-Moo, Choi, Joon-Hoo
• Granted Patent: US 9,601,553 B2
• Time in Patent Office: Days
• US Class Current: 257/99
• CPC Class Codes: H01L 33/465 with a resonant cavity structure
• CPC Class Codes: H10K 50/816 Multilayers, e.g. transparent multilayers
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors
• CPC Class Codes: H10K 59/80518 Reflective anodes, e.g. ITO combined with thick metallic layers

Abstract

An organic light-emitting display having an improved aperture ratio, the organic light-emitting display including a rear electrode, an opposite electrode, and a pixel electrode between the rear electrode and the opposite electrode. Here, an insulating layer is interposed between the pixel electrode and the rear electrode, wherein the pixel electrode, the insulating layer, and the rear electrode are configured as a capacitor of the organic light-emitting display. In such a structure, as the capacitor is disposed in a light-emitting area where the pixel electrode exists, it is not necessary to provide an additional space for a capacitor, thus improving an aperture ratio of the display.

Claims

1. An organic light-emitting display comprising:

a pixel electrode;

an opposite electrode facing a first side of the pixel electrode;

an organic light emission layer between the first side of the pixel electrode and the opposite electrode;

a rear electrode facing a second side of the pixel electrode, the second side facing oppositely away from the first side; and

an insulating layer between the second side of the pixel electrode and the rear electrode,

wherein the pixel electrode, the insulating layer, and the rear electrode are configured as a capacitor of the organic light-emitting display.

2. The organic light-emitting display of claim 1, wherein each of the pixel electrode and the rear electrode is a translucent electrode.

3. The organic light-emitting display of claim 2, wherein the translucent electrode has a structure in which a silver alloy layer is interposed between indium tin oxide (ITO) layers.

4. The organic light-emitting display of claim 1, further comprising:

source/drain electrodes, one of which is connected to the pixel electrode;

an active layer connected to the source/drain electrodes; and

a gate electrode facing the active layer.

5. The organic light-emitting display of claim 4, wherein the gate electrode comprises a translucent electrode layer formed of the same layer as the rear electrode and a low-resistance electrode layer formed on the translucent electrode layer.

6. The organic light-emitting display of claim 5, further comprising a capacitor wiring connected to the rear electrode,

wherein the capacitor wiring comprises a first wiring layer formed of the same layer as the low-resistance electrode layer and connected to the rear electrode and a second wiring layer formed of the same layer as the source/drain electrodes and connected to the first wiring layer.

7. The organic light-emitting display of claim 1, wherein the rear electrode is a split electrode divided into several portions each forming a separate capacitor.

8. A method of manufacturing an organic light-emitting display, the method comprising:

forming an active layer on a substrate;

forming a gate electrode on a first insulating layer disposed on the active layer and forming a rear electrode of the same layer as the gate electrode;

forming a second insulating layer having a contact hole, on the gate electrode and the rear electrode;

forming source/drain electrodes connected to the active layer and a capacitor wiring connected to the rear electrode through the contact hole;

forming a pixel electrode to face the rear electrode with the second insulating layer therebetween, the pixel electrode being connected to one of the source/drain electrodes;

forming an organic light emission layer on the pixel electrode; and

forming an opposite electrode facing the pixel electrode with the organic light emission layer therebetween.

9. The method of claim 8, wherein each of the pixel electrode and the rear electrode is formed of a translucent electrode.

10. The method of claim 9, wherein the translucent electrode is formed by interposing a silver alloy layer between indium tin oxide (ITO) layers.

11. The method of claim 8, wherein the gate electrode comprises a translucent electrode layer formed of the same layer as the rear electrode and a low-resistance electrode layer formed on the translucent electrode layer.

12. The method of claim 11, wherein the capacitor wiring comprises a first wiring layer formed of the same layer as the low-resistance electrode layer and connected to the rear electrode and a second wiring layer formed of the same layer as the source/drain electrodes and connected to the first wiring layer.

13. The method of claim 8, wherein the rear electrode is formed of split electrodes respectively forming separate capacitors.

14. An organic light-emitting display comprising:

a rear electrode;

an opposite electrode;

a pixel electrode between the rear electrode and the opposite electrode;

an organic light emission layer between the pixel electrode and the opposite electrode; and

an insulating layer between the pixel electrode and the rear electrode,

wherein the pixel electrode, the insulating layer, and the rear electrode are configured as a capacitor of the organic light-emitting display.