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

• US 7,940,001 B2
• Filed: 09/16/2005
• Issued: 05/10/2011
• 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: Park, Joon-Young, Kwon, Jang-Hyuk
• Primary Examiner(s): Williams; Joseph L
• Assistant Examiner(s): Snyder; Zachary
• Application Number:
  US11/227,438
• Publication Number:
  US 20060060870A1
• Time in Patent Office: 2,062 Days
• Field of Search: 313498-512
• US Class Current: 313/506
• 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, and an organic layer having at least an emission layer, are arranged thereon and an opposite electrode is arranged directly upon the organic layer;

an encapsulation substrate corresponding to and attached to the substrate;

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

a plurality of color modification layers arranged between ones of the black matrixes to correspond to the emission region, wherein the emission layer of the organic layer is adapted to emit light of a single color, and the plurality of color modification layers are color change mediums including a moisture absorbent material arranged only within the plurality of color modification layers and not on the black matrixes.

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 the emission layer emits blue light.

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

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

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

8. The display of claim 1, wherein the moisture absorbent material comprises a material selected from a group consisting of SiO₂, CaO and CaCl₂.

19. The display of claim 1, wherein the plurality of black matrixes being absent of the moisture absorbent material.

9. 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 including at least an emission layer;

forming an opposite electrode directly on the organic layer;

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

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

forming a moisture absorbent material on the color modification layers and in between adjacent ones of the plurality of black matrixes, the color modification layers being color change mediums.

10. The method of claim 9, the structure comprising at least one thin-film transistor.

11. The method of claim 9, wherein the pixel electrode is a reflective electrode, and the opposite electrode is a transparent electrode.

12. The method of claim 9, wherein the emission layer of the organic layer emits blue light.

13. The method of claim 9, wherein the moisture absorbent material is comprised of a material selected from a group consisting of CaO, SiO₂, CaCl₂ and an organic-inorganic composite absorbent.

14. The method of claim 9, wherein the moisture absorbent material comprises a transparent material that absorbs moisture and oxygen.

15. The method of claim 9, wherein the moisture absorbent material comprises at least one material selected from a group consisting of a nanograin absorbent, a chemical reaction type absorbent, or an organic-inorganic absorbent.

16. The method of claim 9, wherein the moisture absorbent material is formed by one of a screen printing method and a spray coating method, the moisture absorbent material being CaO.

17. The method of claim 9, wherein the moisture absorbent material is formed on an entire surface of the resultant structure having the color modification layers.

18. The method of claim 9, wherein the color modification layers are mixed with the moisture absorbent material.

20. The method of claim 9, the moisture absorbent material being arranged only on and not within the color modification layers.

21. The method of claim 9, wherein the moisture absorbent material is arranged only between adjacent ones of the plurality of black matrixes and on top of the color modification layers.