Organic light-emitting display device and method of manufacturing the same

• US 8,822,999 B2
• Filed: 12/07/2011
• Issued: 09/02/2014
• Est. Priority Date: 07/28/2011
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Choi, Jong-Hyun, Kim, Kwang-Hae
• Primary Examiner(s): Malsawma, Lex
• Assistant Examiner(s): ZHU, SHENG-BAI
• Application Number:
  US13/313,596
• Publication Number:
  US 20130026475A1
• Time in Patent Office: 1,000 Days
• Field of Search: 257/59, 257/71, 257/40, 257/E33.053, 257/E33.064, 257/E21.158, 438/34, 438/29, 438/149, 438/155, 438/30, 438/164
• US Class Current: 257/59
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H01L 29/4908 for thin film semiconductor, e.g. gate of TFT
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors

Abstract

An organic light-emitting display device includes a capacitor lower electrode that includes a semiconductor material doped with ion impurities. A first insulating layer covers an active layer and the capacitor lower electrode. A gate electrode includes a gate lower electrode formed of a transparent conductive material and a gate upper electrode formed of metal. A pixel electrode is electrically connected to the thin film transistor. A capacitor upper electrode is at the same level as the pixel electrode. An etch block layer is formed between the first insulating layer and the capacitor upper electrode. Source and drain electrodes are electrically connected to the active layer. A second insulating layer has an opening completely exposing the capacitor upper electrode. A third insulating layer exposes the pixel electrode. An intermediate layer includes an emissive layer. An opposite electrode faces the pixel electrode.

Claims

1. An organic light-emitting display device comprising:

a capacitor lower electrode formed on a substrate, at the same level as an active layer of a thin film transistor, and comprising a semiconductor material doped with ion impurities;

a first insulating layer formed on the substrate, covering the active layer and the capacitor lower electrode;

a gate electrode of the thin film transistor formed on the first insulating layer and comprising a gate lower electrode formed of a transparent conductive material and a gate upper electrode formed of metal;

a pixel electrode formed on the first insulating layer, electrically connected to the thin film transistor, and formed of a transparent conductive material;

a capacitor upper electrode disposed at the same level as the pixel electrode and formed of a transparent conductive material;

an etch block layer formed between the first insulating layer and the capacitor upper electrode and formed of a transparent conductive material;

source and drain electrodes of the thin film transistor electrically connected to the active layer;

a second insulating layer formed between the first insulating layer and the source and drain electrodes and having an opening completely exposing the capacitor upper electrode;

a third insulating layer formed on the second insulating layer and exposing the pixel electrode; and

an intermediate layer disposed on the pixel electrode and comprising an emissive layer; and

an opposite electrode disposed facing the pixel electrode with the intermediate layer therebetween,

wherein a gap is formed by the etch block layer between a side of the capacitor upper electrode and an inner wall of the opening.

2. The organic light-emitting display device of claim 1, wherein the capacitor lower electrode is at the same level as an interconnection line connected thereto, and the interconnection line and a connection portion connecting the capacitor lower electrode to the interconnection line comprise a semiconductor material doped with the ion impurities.

3. The organic light-emitting display device of claim 2, wherein the connection portion connecting the capacitor lower electrode to the interconnection line corresponds to the gap between the side of the capacitor upper electrode and an inner wall of the opening.

4. The organic light-emitting display device of claim 3, wherein the etch block layer is disposed corresponding to at least the connection portion.

5. The organic light-emitting display device of claim 1, wherein the gate lower electrode, the pixel electrode, and the capacitor upper electrode are formed of a second transparent conductive material, and the etch block layer is formed of a first transparent conductive material having etch selectivity with respect to the second transparent conductive material.

6. The organic light-emitting display device of claim 5, wherein the second transparent conductive material is an amorphous indium tin oxide (a-ITO), and the first transparent conductive material is crystalloid indium tin oxide (p-ITO).

7. The organic light-emitting display device of claim 1, wherein if the intermediate layer comprises a first emissive layer for emitting red light, the intermediate layer further comprises a first auxiliary layer between the first insulating layer and the first emissive layer.

8. The organic light-emitting display device of claim 7, wherein the first auxiliary layer comprises:

a first layer disposed between the pixel electrode and the first emissive layer and allowing holes injected or transported from the pixel electrode to the first emissive layer to pass therethrough; and

a second layer disposed between the first insulating layer and the pixel electrode, and formed of the same material used in the etch block layer at the same level.

9. The organic light-emitting display device of claim 7, wherein if the intermediate layer comprises a second emissive layer for emitting green light, the intermediate layer further comprises a second auxiliary layer having a thickness that is smaller than that of the first auxiliary layer between the first insulating layer and the second emissive layer.

10. The organic light-emitting display device of claim 9, wherein the second auxiliary layer comprises a layer that is interposed between the first insulating layer and the pixel electrode, and is formed of the same material used in the etch block layer at the same level.

11. The organic light-emitting display device of claim 1, wherein the intermediate layer comprises a third emissive layer for emitting blue light.

12. The organic light-emitting display device of claim 1, wherein the opposite electrode is a reflective electrode that reflects light emitted from the emissive layer.

13. The organic light-emitting display device of claim 1, wherein if the intermediate layer comprises a first emissive layer for emitting red light, the intermediate layer is interposed between the pixel electrode and the first emissive layer, and further comprises an auxiliary layer that allows holes injected or transported from the pixel electrode to the first emissive layer to pass therethrough, and the pixel electrode is formed of the same crystalloid indium tin oxide (p-ITO) as in the etch block layer at the same level.