Organic light emitting display device and method of manufacturing the same

• US 20060220549A1
• Filed: 03/28/2006
• Published: 10/05/2006
• Est. Priority Date: 03/30/2005
• 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: Lee, Jong-Hyuk, Oh, Min-Ho, Lee, Byoung-Duk, Choi, Jin-Baek, Kim, Won-Jong, Cho, Yoon-Hyeung
• Granted Patent: US 7,868,546 B2
• Time in Patent Office: Days
• US Class Current: 313/512
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/331 Nanoparticles used in non-emissive layers, e.g. in packaging layer
• 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 59/38 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: Y10T 428/31504 Composite [nonstructural laminate]

Abstract

Provided are an organic light emitting display device including a transparent moisture absorption layer formed of at least one of a metal oxide and metal salt having an average particle diameter of 100 nm or less, a binder, and a selective light absorber absorbing light of a wavelength of a specific range, and a method of manufacturing the same. The transparent absorbing layer further contains a dispersant. The organic light emitting display device including the transparent moisture absorption layer has an excellent moisture absorption capability compared to a conventional organic light emitting display device including a getter, and is transparent. Therefore, the organic light emitting display device has desired lifetime characteristics and improved color purity and contrast characteristics.

Claims

1. A light emitting display device comprising:

a first substrate having a first interior surface;

an array of light emitting units formed on the first interior surface, the array having a top surface facing away from the first substrate;

a second substrate placed over the first substrate and the array, the second substrate having a second interior surface, which faces the first substrate; and

a desiccant layer placed between the first and second substrates, the desiccant layer comprising a desiccant, a binder, a selective light absorber, and at least one of a metal oxide and a metal salt, wherein the at least one of the metal oxide and the metal salt is in a particulate form having an average particle diameter of about 100 nm or less, and wherein the desiccant layer is substantially transparent with respect to visible light.

2. The device of claim 1, wherein the selective light absorber selectively absorbs light of a wavelength of 410 nm or 490 nm, or one or more wavelengths within the range of 570-590 nm.

3. The device of claim 1, wherein the selective light absorber has in a particulate form having an average particle diameter from about 30 to about 50 nm.

4. The device of claim 1, wherein the amount of the selective absorber is in the range of from about 0.1 to about 200 parts by weight based on 100 parts by weight of the desiccant.

5. The organic device of claim 1, wherein the selective light absorber comprises at least one compound selected from the group consisting of a porphyrin-based compound, a pyromethene-based compound, a cyanine-based compound, a satural absorber phenothiazine-based compound and an azaporphyrin-based compound.

6. The device of claim 1, wherein the desiccant layer is formed on at least one of the second interior surface and the top surface with or without an intervening material between the desiccant and the second interior surface or between the desiccant and the top surface.

7. The device of claim 5, wherein the desiccant layer is arranged in a location such that at least part of light emitted from the array pass through the desiccant layer.

8. The device of claim 5, wherein the array of light emitting units comprises a plurality of organic light emitting diodes, wherein each organic light emitting diode comprises a first electrode, a second electrode and an emissive layer located between the first and second electrodes, and wherein at least one of the first and second electrodes is substantially transparent.

9. The device of claim 1, further comprising a plurality of side walls interconnecting with the first and second substrates, wherein the desiccant layer is formed on one or more of the plurality of side walls.

10. The device of claim 1, wherein the at least one of the metal oxide and the metal salt comprises at least one selected from the group consisting of alkali metal oxides, alkali-earth metal oxides, metal halides, metal sulfates and metal perchlorates.

11. The device of claim 1, wherein the metal oxide comprises CaO.

12. The device of claim 1, wherein the desiccant layer further comprises a dispersant in an amount sufficient to substantially uniformly disperse the desiccant within the desiccant layer.

13. The device of claim 1, wherein the desiccant layer further comprises at least one binder selected from the group consisting of an organic binder, an inorganic binder, and an organic/inorganic complex binder, and the at least one binder is in an amount from about 10 to about 5000 parts by weight based on 100 parts by weight of the desiccant.

14. The device of claim 1, wherein the desiccant layer has a thickness from about 0.1 to about 300 μ

m.

15. The device of claim 1, wherein the desiccant layer transmits over about 90% of visible light incident thereto.

16. The device of claim 1, wherein the desiccant layer transmits from about 95 to about 98% of visible light incident thereto.

17. The device of claim 1, wherein the desiccant layer absorbs moisture at a rate from about 30 to about 50%.

18. A method of manufacturing a light emitting display device, the method comprising:

providing a first substrate having a first interior surface;

forming an array of organic light emitting units on the first interior surface, the array having a top surface facing away from the first substrate;

placing a second substrate over the first substrate and the array, the second substrate having a second interior surface, which faces the first substrate;

interconnecting the first and second substrates with a plurality of side walls, thereby forming an enclosed space; and

prior to interconnecting, forming a desiccant layer in a place to be enclosed within the enclosed space, the desiccant layer comprising a desiccant, a binder, a selective light absorber, and at least one of a metal oxide and a metal salt, wherein the at least one of the metal oxide and the metal salt is in a particulate form having an average particle diameter of about 100 nm or less, and wherein the desiccant layer is substantially transparent with respect to visible light.

19. The method of claim 18, wherein the desiccant layer further comprises a selective light absorber selectively absorbing light of a wavelength of 410 nm or 490 nm, or a wavelength within the range of 570-590 nm.

20. A method of displaying a visable image, comprising:

providing a light emitting display device comprising;

a first substrate having a first interior surface,

an array of light emitting units formed on the first interior surface, the array having a top surface facing away from the first substrate,

a second substrate placed over the first substrate and the array, the second substrate having a second interior surface, which faces the first substrate, and

a desiccant layer placed between the first and second substrates, the desiccant layer comprising a desiccant, a binder, a selective light absorber, and at least one of a metal oxide and a metal salt, wherein the at least one of the metal oxide and the metal salt is in a particulate form having an average particle diameter of about 100 nm or less, and wherein the desiccant layer is substantially transparent with respect to visible light; and

stimulating the device to emit visible light from at least part of the light emitting units, thereby displaying a visible image on at least one of the first and second substrates.

21. The method of claim 20, wherein at least part of the visible light emitted from the at least part of the light emitting units passes through the desiccant layer.

22. The method of claim 21, wherein the visible image is displayed on the second substrate.