Organic luminescence emitting display device and method of manufacturing the same

• US 9,349,989 B2
• Filed: 12/19/2013
• Issued: 05/24/2016
• Est. Priority Date: 02/07/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Hun, Park, Jin-Woo
• Primary Examiner(s): Sengdara, Vongsavanh
• Application Number:
  US14/134,945
• Publication Number:
  US 20140217380A1
• Time in Patent Office: 887 Days
• Field of Search: 257/40
• US Class Current: 1/1
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants

Abstract

An organic light emitting display apparatus including an organic light-emitting unit formed on a substrate; a moisture absorbing layer formed on the organic light-emitting unit; and at least one inorganic layer, which is formed on the moisture absorbing layer and includes a low temperature viscosity transition (LVT) inorganic material.

Claims

1. An organic light emitting display apparatus comprising:

an organic light-emitting unit comprising a top electrode and a bottom electrode disposed on a substrate;

a moisture absorbing layer disposed on the organic light-emitting unit; and

at least one inorganic layer, which is disposed on the moisture absorbing layer including a low temperature viscosity transition (LVT) inorganic material;

wherein the temperature for viscosity transition of the LVT inorganic material is lower than the denaturation temperature of a material included in the organic light-emitting unit; and

wherein the moisture absorbing layer comprises a metal having the same or greater reactivity as that of the metal included in the top electrode of the organic light-emitting unit.

2. The organic light emitting display apparatus of claim 1, wherein the LVT inorganic material comprises a tin oxide.

3. The organic light emitting display apparatus of claim 1, wherein the LVT inorganic material comprises at least one from among a phosphor oxide, boron phosphate, a tin fluoride, a niobium oxide, or a tungsten oxide.

4. The organic light emitting display apparatus of claim 1, wherein the LVT inorganic material comprises:

SnO;

SnO and P₂O₅;

SnO and BPO₄;

SnO, SnF₂, and P₂O₅;

SnO, SnF₂, P₂O₅ and NbO;

or

SnO, SnF₂, P₂O₅ and WO₃.

5. The organic light emitting display apparatus of claim 1, wherein the moisture absorbing layer comprises at least one of Mg or Ca.

6. The organic light emitting display apparatus of claim 1, wherein the moisture absorbing layer comprises at least one of MgO or CaO.

7. The organic light emitting display apparatus of claim 1, wherein at least one additional inorganic layer including the LVT inorganic material is further arranged between the organic light-emitting unit and the moisture absorbing layer.

8. The organic light emitting display apparatus of claim 1, further comprising a barrier layer between the organic light-emitting unit and the moisture absorbing layer.

9. The organic light emitting display apparatus of claim 8, wherein the barrier layer comprises at least one inorganic layer containing at least one of an oxide or a nitride.

10. The organic light emitting display apparatus of claim 9, wherein the barrier layer comprises at least one from among SiO_x, Al₂O₃, zinc tin oxide (ZTO), Ga-doped zinc oxide (GZO), Al-doped zinc oxide (AZO), silicon oxynitride (SiON), or SiN_x.

11. A method of manufacturing an organic light emitting display apparatus, the method comprising:

forming an organic light-emitting unit comprising a top electrode and a bottom electrode on a substrate;

forming a moisture absorbing layer on the organic light-emitting unit; and

forming at least one inorganic layer, which includes a low temperature viscosity transition (LVT) inorganic material, on the moisture absorbing layer;

wherein the temperature for viscosity transition of the LVT inorganic material is lower than the denaturation temperature of a material included in the organic light-emitting unit; and

wherein the moisture absorbing layer comprises a metal having the same or greater reactivity as that of the metal included in a top electrode of the organic light-emitting unit.

12. The method of claim 11, wherein the forming of the inorganic layer comprises:

forming a pre-inorganic layer including the LVT inorganic material by providing the LVT inorganic material onto the organic light-emitting unit; and

healing the pre-inorganic layer at a temperature equal to or higher than the temperature for viscosity transition of the LVT inorganic material.

13. The method of claim 12, wherein the temperature for viscosity transition of the LVT inorganic material is the lowest temperature at which the LVT inorganic material has a degree of fluidity.

14. The method of claim 12, wherein the LVT inorganic material is provided via thermal evaporation, sputtering, vacuum deposition, cold deposition, electron beam coating, or ion plating.

15. The method of claim 12, wherein the healing operation is performed by thermally treating the pre-inorganic layer at a temperature equal to or higher than the temperature for viscosity transition of the LVT inorganic material and lower than the denaturation temperature of the material included in the organic light-emitting unit.

16. The method of claim 12, wherein the healing is performed under vacuum atmosphere or an inert gas atmosphere.

17. The method of claim 11, wherein the moisture absorbing layer is formed by thermal evaporation, sputtering, vacuum deposition, cold deposition, electron beam coating, or ion plating.

18. The method of claim 11, wherein the moisture absorbing layer comprises at least one of Mg or Ca.

19. The method of claim 11, wherein the moisture absorbing layer comprises at least one of MgO or CaO.

20. A method of claim 11, further comprising forming at least one auxiliary inorganic layer including the LVT inorganic material between the organic light-emitting unit and the moisture absorbing layer,

wherein the forming of the auxiliary inorganic layer comprises:

forming an auxiliary pre-inorganic layer including the LVT inorganic material on the organic light-emitting unit by providing the LVT inorganic material onto the organic light-emitting unit;

forming a pre-inorganic layer including the LVT inorganic material on the moisture absorbing layer by providing the LVT inorganic material onto the moisture absorbing layer; and

healing the auxiliary pre-inorganic layer and the pre-inorganic layer together at a temperature equal to or higher than the temperature for viscosity transition of the LVT inorganic material.

21. The method of claim 11, further comprising forming a barrier layer between the organic light-emitting unit and the moisture absorbing layer.

22. The method of claim 21, wherein the barrier layer comprises at least one inorganic layer containing at least one of an oxide or a nitride.

23. The method of claim 21, wherein the barrier layer comprises at least one from among SiO_x, Al₂O₃, zinc tin oxide (ZTO), Ga-doped zinc oxide (GZO), Al-doped zinc oxide (AZO), silicon oxynitride (SiON), or SiN_x.

24. The method of claim 21, wherein the barrier layer is formed by thermal evaporation, sputtering, vacuum deposition, cold deposition, electron beam coating, or ion plating.