ORGANIC LIGHT EMITTING DISPLAY DEVICE AND METHOD OF MANUFACTURING THE SAME

• US 20130032830A1
• Filed: 06/08/2012
• Published: 02/07/2013
• Est. Priority Date: 08/05/2011
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Myung-Seop, LEE, Jae-Young, Yang, Won-Jae
• Granted Patent: US 9,891,361 B2
• Time in Patent Office: Days
• US Class Current: 257/88
• CPC Class Codes: G02B 5/3041 comprising multiple thin layers, e.g. multilayer stacks
• CPC Class Codes: H10K 50/8445 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/8731 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/8793 Arrangements for polarized light emission H10K59/8791 takes precedence

Abstract

Discussed are an organic light emitting display device and a method of manufacturing the same in which organic and inorganic films are formed on a polarization plate, and the polarization plate is attached to an organic light emitting panel so that the organic and inorganic films seal the organic light emitting panel, thereby achieving improved polarization and a simple sealing structure.

Claims

1. An organic light emitting display device comprising:

a substrate;

an organic light emitting element array disposed on the substrate;

a polarization plate disposed over the organic light emitting element array and including a first thin-film stacked structure formed of at least one organic film and at least one inorganic film, the at least one organic film and the at least one inorganic film being disposed one on top of the other; and

an adhesive layer disposed between the substrate and the polarization plate, wherein the adhesive layer covers the organic light emitting element array.

2. The device of claim 1, wherein the polarization plate further comprises a second thin-film stacked structure disposed on an opposite side of the polarization plate from the first thin-film stacked structure, and formed of at least one organic film and at least one inorganic film, the at least one organic film and the at least one inorganic film of the second thin-film stacked structure being disposed one on top of the other.

3. The device of claim 1, wherein the polarization plate further comprises a second thin-film stacked structure formed of at least one of an organic film or an inorganic film.

4. The device of claim 1, wherein the polarization plate comprises:

a quarter wave plate (λ

/4 plate) disposed on the first thin-film stacked structure; and

a linear polarization layer disposed on the quarter wave plate.

5. The device of claim 4, wherein the first thin-film stacked structure faces the organic light emitting element array.

6. The device of claim 4, wherein the organic film of the first thin-film stacked structure is in contact with the quarter wave plate.

7. The device of claim 4, wherein the polarization plate further comprises a second thin-film stacked structure disposed between the quarter wave plate and the linear polarization layer, wherein the second thin-film stacked structure is formed of at least one organic film and at least one inorganic film, the at least one organic film and the at least one inorganic film of the second thin-film stacked structure are disposed one on top of the other.

8. The device of claim 4, wherein the polarization plate further comprises a second thin-film stacked structure disposed between the quarter wave plate and the linear polarization layer, wherein the second thin-film stacked structure is formed of at least one of an organic film or an inorganic film.

9. The device of claim 4, wherein a total thickness including the quarter wave plate and the first thin-film stacked structure is about 50 μ

m to 80 μ

m.

10. The device of claim 4, wherein an absorption axis of the linear polarization layer is at +45°

or −

45°

angle with respect to a slow axis of the quarter wave plate.

11. The device of claim 4, wherein the quarter wave plate is formed of a stack consisting of two eighth wave plates (λ

/8 plates).

12. The device of claim 4, wherein the quarter wave plate is made of a material having a reflection rate equal to or less than 5% in a wavelength range of 400 nm to 500 nm.

13. The device of claim 4, wherein a retardation value of the quarter wave plate is in a range of 138 nm to 148 nm.

14. The device of claim 1, wherein the substrate comprises any one of a plastic thin film, a thin film glass and a metal foil, each having a thickness equal to or less than 0.2 mm.

15. The device of claim 14, wherein the quarter wave plate has a moisture permeability equal to or less than 10⁻

3 g/m²·

day.

16. The device of claim 1, wherein the at least one organic film includes a first and second organic films so that the at least one inorganic film is disposed in between the first and second organic films.

17. The device of claim 1, wherein an incident light that obtains a first circular polarization in passing through the polarization plate, obtains a second circular polarization opposite to the first circular polarization upon reflection off the substrate, and is absorbed into the polarization plate.

18. The device of claim 1, wherein the substrate is flexible.

19. A method of manufacturing an organic light emitting display device, comprising:

forming an organic light emitting element array on a substrate;

forming, on a first surface of a quarter wave plate, a first thin-film stacked structure of at least one organic film and at least one inorganic film, the at least one organic film and the at least one inorganic film being disposed one on top of the other;

adhering the first thin-film stacked structure on the substrate using an adhesive layer so that the first thin-film stacked structure and the organic light emitting element array face each other; and

attaching a linear polarization layer on a second surface of the quarter wave plate opposite the first second surface, to form a polarization plate including the quarter wave plate and the linear polarization layer.

20. The method of claim 19, wherein the attaching of the linear polarization layer comprises disposing the linear polarization layer on the quarter wave plate so that an absorption axis of the linear polarization layer is at +45°

or −

45°

angle with respect to a slow axis of the quarter wave plate.

21. The method of claim 19, further comprising forming a second thin-film stacked structure between the quarter wave plate and the linear polarization layer, the second thin-film stacked structure being formed of at least one organic film and at least one inorganic film, the at least one organic film and the at least one inorganic film of the second thin-film stacked structure being disposed one on top of the other.

22. The method of claim 19, wherein the forming of the first thin-film stacked structure comprises:

vaporizing and coating organic solvent on the first surface of the quarter wave plate;

curing the organic solvent to form the at least one organic film; and

depositing the at least one inorganic film on the at least one organic film.

23. The method of claim 22, wherein the forming of the first thin-film stacked structure is carried out in a state in which the quarter wave plate is wound around a roll.

24. The method of claim 19, wherein the forming of the linear polarization layer further comprises providing an adhesive layer between the second surface of the quarter wave plate and the linear polarization layer.

25. An organic light emitting display device comprising:

a substrate;

an organic light emitting element array disposed on the substrate;

a polarization plate disposed over the organic light emitting element array and including a circular polarizer and a first thin-film stacked structure formed of at least one of an organic film and an inorganic film; and

an adhesive layer disposed between the substrate and the polarization plate, wherein the adhesive layer covers the organic light emitting element array.

26. The device of claim 25, wherein the polarization plate further comprises a transparent optical film.