Organic light emitting display device and fabricating method of the same having organic light emitting diodes stacked in a double layer

• US 7,855,507 B2
• Filed: 04/19/2006
• Issued: 12/21/2010
• Est. Priority Date: 04/27/2005
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Eun-ah
• Primary Examiner(s): Roy; Sikha
• Application Number:
  US11/406,802
• Publication Number:
  US 20060255725A1
• Time in Patent Office: 1,707 Days
• Field of Search: 313/504, 313/506
• US Class Current: 313/506
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths

Abstract

An organic light emitting display device and a method of fabricating the same are disclosed. The organic light emitting display device includes a first organic light emitting diode and a second organic light emitting diode. The first organic light emitting diode has a first electrode, a second electrode, and a first organic emission layer positioned between the first and second electrodes. The second organic light emitting diode has the second electrode, a third electrode, and a second organic emission layer positioned between the second and third electrodes. A first driver thin film transistor is connected to the first electrode. A second driver thin film transistor is connected to the second electrode.

Claims

1. An organic light emitting display device comprising:

at least one unit pixel, wherein each unit pixel comprises;

a first organic light emitting diode having a first electrode, a second electrode, and

a first organic emission layer positioned between the first and second electrodes;

a second organic light emitting diode having the second electrode, a third electrode, and a second organic emission layer positioned between the second and third electrodes;

a first driver thin film transistor connected to the first electrode;

a second driver thin film transistor connected to the second electrode; and

a source of the first driver thin film transistor and a source of the second driver thin film transistor are connected to a common power line ELVDD.

2. The organic light emitting display device according to claim 1, further comprising a work function assistant layer positioned between the second electrode and the first organic emission layer.

3. The organic light emitting display device according to claim 1, wherein the first electrode is one layer selected from a group consisting of an Indium Tin Oxide (ITO) layer, an Indium Zinc Oxide (IZO) layer, a Tin Oxide (TO) layer, and a Zinc Oxide (ZnO) layer.

4. The organic light emitting display device according to claim 1, wherein the second electrode is one layer selected from a group consisting of an Indium Tin Oxide (ITO) layer, an Indium Zinc Oxide (IZO) layer, a Tin Oxide (TO) layer, and a Zinc Oxide (ZnO) layer.

5. The organic light emitting display device according to claim 4, further comprising a work function assistant layer interposed between the second electrode and the first organic emission layer,

wherein the work function assistant layer is one layer selected from a group consisting of magnesium (Mg), an Mg alloy, silver (Ag), an Ag alloy, aluminum (Al), an Al alloy, calcium (Ca), a Ca alloy, Barium (Ba), and a Ba alloy.

6. The organic light emitting display device according to claim 1, wherein the first electrode, the first organic emission layer, the second electrode, the second organic emission layer, and the third electrode are sequentially stacked on a substrate.

7. The organic light emitting display device according to claim 1, wherein a gate electrode of the first driver thin film transistor and a gate electrode of the second driver thin film transistor are connected to each other, and a source electrode of the first driver thin film transistor and a source electrode of the second driver thin film transistor are connected to each other.

8. An organic light emitting display device comprising:

at least one unit pixel, wherein each unit pixel comprises;

a first electrode layer;

a first organic emission layer formed on the first electrode layer;

a second electrode layer formed on the first organic emission layer, wherein the first organic emission layer is interposed between the first and second electrodes;

a second organic emission layer formed on the second electrode layer;

a third electrode formed on the second organic emission layer, wherein the second organic emission layer is interposed between the second and third electrodes;

a first driver thin film transistors electrically connected to the first electrode layer;

a second driver thin film transistor electrically connected to the second electrode layer; and

a source of the first driver thin film transistor and a source of the second driver thin film transistor are connected to a common power line ELVDD.

9. The organic light emitting display device of claim 8, further comprising:

a work function assist layer formed between the first organic emission layer and the second electrode layer.

10. An organic light emitting display device comprising:

a first organic light emitting diode;

a second organic light emitting diode stacked on the first organic light emitting diode;

an electrode shared by the first and second organic light emitting diodes;

a first driver thin film transistors electrically connected to the first organic light emitting diode;

a second driver thin film transistor electrically connected to the shared electrode; and

a source of the first driver thin film transistor and a source of the second driver thin film transistor are connected to a common power line ELVDD.

11. The organic light emitting display device of claim 10, wherein the organic light emitting diodes comprise a common electrode.