Light emitting display device that effectively prevent fluorine diffusion to the light emitting layer and method for fabricating the same

• US 8,975,811 B2
• Filed: 10/21/2013
• Issued: 03/10/2015
• Est. Priority Date: 05/28/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Yoon, Joo Sun
• Primary Examiner(s): Green, Tracie Y
• Application Number:
  US14/058,715
• Publication Number:
  US 20140354139A1
• Time in Patent Office: 505 Days
• Field of Search: 313498-512, 257/98, 257/40
• US Class Current: 313/498
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 71/135 using ink-jet printing

Abstract

A light emitting display device includes: a substrate; a first electrode disposed on the substrate in each pixel area; an insulating film disposed on the substrate, where a first opening, which exposes the first electrode, is defined in the insulating film; a blocking film disposed on a side surface of the insulating film, which defines the first opening; a light emitting layer disposed in the first opening and on the first electrode, where the light emitting layer is in contact with the blocking film; and a second electrode disposed on the light emitting layer.

Claims

1. A light emitting display device comprising:

a substrate;

a first electrode disposed on the substrate in a pixel area of a plurality of pixel areas;

an insulating film disposed on the substrate, wherein a first opening, which exposes the first electrode, is defined in the insulating film;

a blocking film disposed on a side surface of the insulating film, which defines the first opening;

a light emitting layer disposed in the first opening and on the first electrode, wherein the light emitting layer is in contact with the blocking film; and

a second electrode disposed on the light emitting layer.

2. The light emitting display device of claim 1, wherein a height of the blocking film relative to the first electrode is substantially equal to or higher than a height of the light emitting layer relative to the first electrode.

3. The light emitting display device of claim 1, wherein the blocking film extends to an upper surface of the insulating film from the side surface of the insulating film to cover a corner at which the upper surface and the side surface of the insulating film meet each other.

4. The light emitting display device of claim 1, wherein the blocking film extends from the side surface to an upper surface of the insulating film to cover substantially an entire upper surface of the insulating film.

5. The light emitting display device of claim 1, wherein

the insulating film comprises a first portion and a second portion, which are disposed spaced apart from each other between adjacent pixel areas, and

a second opening is defined between the first portion and the second portion of the insulating film.

6. The light emitting display device of claim 5, wherein the blocking film is disposed on a first side surface of the first portion, which defines the first opening, and a first side surface of the second portion, which defines the first opening.

7. The light emitting display device of claim 6, wherein

the blocking film extends to an upper surface of the first portion from the first side surface of the first portion to cover a corner at which the upper surface and the first side surface of the first portion meet each other, and

the blocking film extends to an upper surface of the second portion from the first side surface of the second portion to cover a corner at which the upper surface and the first side surface of the second portion meet each other.

8. The light emitting display device of claim 6, wherein

the blocking film extends from the first side surface to an upper surface of the first portion to cover substantially an entire upper surface of the first portion, and

the blocking film extends from the first side surface to an upper surface of the second portion to cover substantially an entire upper surface of the second portion.

9. The light emitting display device of claim 1, wherein the blocking film comprises a graphene material.

10. The light emitting display device of claim 1, wherein the insulating film comprises a lyophilic insulating material or a lyophobic insulating material comprising fluorine.

11. A method for fabricating a light emitting display device, the method comprising:

providing a first electrode in each pixel area on a substrate;

providing an insulating film, and forming a first opening, which exposes the first electrode on the substrate, in the insulating film;

providing a blocking film on a side surface of the insulating film;

providing a light emitting layer on the first electrode exposed through the first opening, wherein the light emitting layer is in contact with the blocking film; and

providing a second electrode on the light emitting layer.

12. The method of claim 11, wherein the providing the blocking film comprises:

applying a graphene material to cover the insulating film and the first electrode; and

patterning the graphene material.

13. The method of claim 12, wherein the providing the blocking film further comprises using a dipping process.

14. The method of claim 12, wherein the patterning the graphene material comprises removing a portion of the graphene material, which corresponds to a region except for the side surface of the insulating film, using a photolithography process, which comprises performing an etching process using oxygen plasma or ozone plasma.

15. The method of claim 11, wherein a height of the blocking film relative to the first electrode is equal to or higher than a height of the light emitting layer relative to the first electrode.

16. The method of claim 11, wherein

the blocking film extends to an upper surface of the insulating film from the side surface of the insulating film to cover a corner, at which the upper surface and the side surface of the insulating film meet each other, or to cover substantially an entire upper surface of the insulating film.

17. The method of claim 11, wherein the providing the insulating film comprises providing a first portion of the insulating film and a second portion of the insulating film between adjacent pixel areas, wherein a second opening is defined between the first portion and the second portion.

18. The method of claim 17, wherein the providing the blocking film comprises providing the blocking film on a first side surface of the first portion, which defines the first opening, and a first side surface of the second portion, which defines the first opening.

19. The method of claim 18, wherein

the blocking film extends to an upper surface of the first portion from the first side surface of the first portion to cover a corner, at which the upper surface and the first side surface of the first portion meet each other, or to cover substantially an entire upper surface of the first portion, and

the blocking film extends to an upper surface of the second portion from the first side surface of the second portion to cover a corner at which the upper surface and the first side surface of the second portion meet each other, or to cover substantially an entire upper surface of the second portion.

20. The method of claim 11, wherein the insulating film comprises a lyophilic insulating material or a lyophobic insulating material comprising fluorine.