Organic light-emitting display and method of manufacturing the same

• US 9,601,553 B2
• Filed: 09/23/2011
• Issued: 03/21/2017
• 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
• Primary Examiner(s): Wright, Tucker J
• Assistant Examiner(s): Hatzilambrou, Mark
• Application Number:
  US13/244,120
• Publication Number:
  US 20120267670A1
• Time in Patent Office: 2,006 Days
• US Class Current: 1/1
• 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

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 plurality of pixels, each pixel 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 plurality of capacitors of the organic light-emitting display, and the pixel electrode overlaps with and is located between the organic light emission layer and the rear electrode,

wherein the rear electrode is a split electrode divided into several discontiguous portions each forming a separate capacitor of the plurality of capacitors, and

wherein the several discontiguous portions together extend from a first edge of the pixel electrode to a second edge of the pixel electrode facing away from the first edge, such that a micro cavity extends from the first edge to the second edge.

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 a 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 a same layer as the low-resistance electrode layer and connected to the rear electrode and a second wiring layer formed of a 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 pixel electrode is configured with the rear electrode and the organic light emission layer to provide a micro cavity to construct an intensity of light emitted from the organic light emission layer.

8. An organic light-emitting display comprising:

a plurality of pixels, each pixel 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 plurality of capacitors of the organic light-emitting display, and the pixel electrode is configured with the organic light emission layer and the opposite electrode as an organic light emitting diode (OLED) of the organic light-emitting display,

wherein the rear electrode is a split electrode divided into several discontiguous portions each forming a separate capacitor of the plurality of capacitors, and

wherein the several discontiguous portions together extend from a first edge of the pixel electrode to a second edge of the pixel electrode facing away from the first edge, such that a micro cavity extends from the first edge to the second edge.

9. The organic light-emitting display of claim 8, wherein the pixel electrode is configured with the rear electrode and the organic light emission layer to provide a micro cavity to construct an intensity of light emitted from the organic light emission layer.