Full-color organic light emitting display and method of fabricating the same

• US 20060060870A1
• Filed: 09/16/2005
• Published: 03/23/2006
• Est. Priority Date: 09/21/2004
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kwon, Jang-Hyuk, Park, Joon-Young
• Granted Patent: US 7,940,001 B2
• Time in Patent Office: Days
• US Class Current: 257/88
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/874 including getter material or desiccant
• CPC Class Codes: H10K 59/8792 comprising light absorbing layers, e.g. black layers
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/421 using coherent electromagnetic radiation, e.g. laser annealing

Abstract

A full-color organic light emitting display (OLED) and method of fabricating the same. The display includes a substrate with a pixel electrode, an organic layer having at least an emission layer, and an opposite electrode formed thereon. An encapsulation substrate has formed thereon an organic emission layer that emits light of a single color and a black matrix that defines emission regions. A moisture absorbent material and one of color filter layers and color change mediums are formed between the black matrixes to correspond to the emission layer. The method of making alleviates the need for a separate processes for treating the moisture absorbent material and for forming the color filter layers or the color change mediums using a shadow mask.

Claims

1. A display, comprising:

a substrate on which a pixel electrode, an organic layer having at least an emission layer, and an opposite electrode are arranged thereon;

an encapsulation substrate corresponding to and attached to the substrate;

a black matrix arranged on the encapsulation substrate, the black matrix being adapted to define an emission region; and

a plurality of color modification layers comprising a moisture absorbent material arranged between the black matrixes to correspond to the emission region, wherein the emission layer of the organic layer is adapted emit light of a single color, the color modification layers being one of color filter layers and a color change mediums.

2. The display of claim 1, further comprising a thin-film transistor arranged between the substrate and the pixel electrode and electrically connected to the pixel electrode.

3. The display of claim 1, wherein the pixel electrode is a reflective electrode, and the opposite electrode is a transparent electrode.

4. The display of claim 1, wherein when the emission layer emits white light, the color modification layers are color filter layers, the color filter layers being arranged on the encapsulation substrate.

5. The display of claim 1, wherein when the emission layer emits blue light, the color modification layers are color change medium, the color change mediums being arranged on the encapsulation substrate.

6. The display of claim 1, wherein the moisture absorbent material is a transparent material that comprises elements that absorb moisture and oxygen.

7. The display of claim 1, wherein the moisture absorbent material comprises at least one material selected from the group consisting of a nanograin absorbent, a chemical reaction type absorbent and an organic-inorganic absorbent.

8. The display of claim 1, wherein the moisture absorbent material is arranged on an entire surface of the color modification layers.

9. The display of claim 1, wherein the moisture absorbent material is arranged within the color modification layers.

10. A method, comprising:

forming a structure on a substrate;

forming a pixel electrode on the structure and on the substrate;

forming an organic layer on the pixel electrode, the organic layer comprising at least an emission layer;

forming an opposite electrode on the organic layer;

forming a black matrixes on an encapsulation substrate that corresponds to the substrate, the black matrixes being adapted to define an emission region;

forming a color modification layers on the encapsulation substrate and between the black matrixes; and

forming a moisture absorbent material on the color modification layers, the color modification layers being either color filter layers or color change mediums.

11. The method of claim 10, the structure comprising at least one thin-film transistor.

12. The method of claim 10, wherein the pixel electrode is a reflective electrode, and the opposite electrode is a transparent electrode.

13. The method of claim 10, wherein the emission layer of the organic layer emits one of white light and blue light.

14. The method of claim 13, wherein when the emission layer emits the white light, the color modification layers are the color filter layers.

15. The method of claim 13, wherein when the emission layer emits the blue light, the color modification layers are the color change mediums.

16. The method of claim 10, wherein the color modification layers are formed by one of a laser induced thermal imaging method, a photolithography method, and an inkjet method.

17. The method of claim 10, wherein the moisture absorbent material is a transparent material that comprises material that absorbs moisture and oxygen.

18. The method of claim 17, wherein the moisture absorbent material comprises at least one material selected from a group consisting of a nanograin absorbent, a chemical reaction type absorbent, an organic-inorganic absorbent.

19. The method of claim 10, wherein the moisture absorbent material is formed by one of a screen printing method and a spray coating method.

20. The method of claim 10, wherein the moisture absorbent material is formed on an entire surface of the resultant structure having the color modification layer.

21. The method of claim 10, wherein the color modification layers are mixed with the moisture absorbent material.