ORGANIC LIGHT EMITTING DIODE DISPLAY

• US 20160380235A1
• Filed: 03/31/2016
• Published: 12/29/2016
• Est. Priority Date: 06/25/2015
• 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, Won Jong, KIM, Dong Chan, KIM, Eung Do, SEO, Dong Kyu, IM, Da Hea, YIM, Sang Hoon, CHO, Yoon Hyeung, HAN, Won Suk
• Granted Patent: US 10,361,400 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/00 Organic light-emitting devices integrated devices or assemblies of multiple devices H10K59/00, H10K65/00; organic semiconductor lasers H01S5/36
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/8445 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 85/636 comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
• CPC Class Codes: H10K 85/6574 comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes
• CPC Class Codes: H10K 85/6576 comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene

Abstract

An organic light emitting diode display including: a substrate; an organic light emitting diode on the substrate; a capping layer on the organic light emitting diode and including a high refractive layer including an inorganic material having a refractive index that is equal to or greater than about 1.7 and equal to or less than about 6.0; and a thin film encapsulation layer covering the capping layer and the organic light emitting diode, the inorganic material including at least one selected from the group consisting of CuI, thallium iodide (TlI), BaS, Cu₂O, CuO, BiI, WO₃, TiO₂, AgI, CdI₂, HgI₂, SnI₂, PbI₂, BiI₃, ZnI₂, MoO₃, Ag₂O, CdO, CoO, Pr₂O₃, SnS, PbS, CdS, CaS, ZnS, ZnTe, PbTe, CdTe, SnSe, PbSe, CdSe, AlAs, GaAs, InAs, GaP, InP, AlP, AlSb, GaSb, and InSb.

Claims

1. An organic light emitting diode display comprising:

a substrate;

an organic light emitting diode on the substrate;

a capping layer on the organic light emitting diode and including a high refractive layer comprising an inorganic material having a refractive index that is equal to or greater than about 1.7 and equal to or less than about 6.0; and

a thin film encapsulation layer covering the capping layer and the organic light emitting diode, and

wherein the inorganic material comprises at least one selected from the group consisting of CuI, thallium iodide (TlI), BaS, Cu₂O, CuO, BiI, WO₃, TiO₂, AgI, CdI₂, HgI₂, SnI₂, PbI₂, BiI₃, ZnI₂, MoO₃, Ag₂O, CdO, CoO, Pr₂O₃, SnS, PbS, CdS, CaS, ZnS, ZnTe, PbTe, CdTe, SnSe, PbSe, CdSe, AlAs, GaAs, InAs, GaP, InP, AlP, AlSb, GaSb, and InSb.

2. The organic light emitting diode display of claim 1, wherein:

the capping layer comprises a top layer directly below the thin film encapsulation layer, the thin film encapsulation layer comprises a base layer directly on the capping layer; and

the top layer and the base layer have different refractive indexes from each other.

3. The organic light emitting diode display of claim 2, wherein:

the thin film encapsulation layer comprises a first encapsulation layer on the base layer, a second encapsulation layer on the first encapsulation layer, and a third encapsulation layer on the second encapsulation layer; and

the first encapsulation layer is an inorganic layer;

the second encapsulation layer is an organic layer; and

the third encapsulation layer is an inorganic layer.

4. The organic light emitting diode display of claim 3, wherein the base layer comprises at least one selected from the group consisting of LiF, SiOx, SiC, MgF₂, AlF₃, and NaF.

5. The organic light emitting diode display of claim 4, wherein the first encapsulation layer comprises at least one selected from the group consisting of SiON, TiO₂, and SiNx.

6. The organic light emitting diode display of claim 5, wherein the third encapsulation layer comprises at least one selected from the group consisting of SiON, SiNx, and TiO₂.

7. The organic light emitting diode display of claim 2, wherein the capping layer further comprises a low refraction layer comprising an inorganic material with a refractive index that is equal to or greater than about 1.0 and equal to or less than about 1.7.

8. The organic light emitting diode display of claim 7, wherein the low refraction layer is between the high refractive layer and the organic light emitting diode.

9. The organic light emitting diode display of claim 8, wherein the low refraction layer comprises an inorganic material that includes a halogen compound.

10. The organic light emitting diode display of claim 9, wherein the low refraction layer comprises at least one selected from the group consisting of MgF₂, LiF, AlF₃, and NaF.

11. The organic light emitting diode display of claim 7, wherein the low refraction layer comprises at least one low refraction layer, and the high refractive layer comprises at least one high refractive layer, and the capping layer has a structure in which the low refraction layer and the high refraction layer are alternately stacked.

12. The organic light emitting diode display of claim 1, wherein:

the organic light emitting diode comprises a first electrode and a second electrode facing each other, and a light-emitting layer between the first electrode and the second electrode; and

the capping layer is directly on the second electrode.

13. The organic light emitting diode display of claim 12, wherein the first electrode comprises a reflective layer.

14. The organic light emitting diode display of claim 13, wherein the thin film encapsulation layer covers a lateral surface of the capping layer.

15. The organic light emitting diode display of claim 14, wherein the light-emitting layer comprises a red light-emitting layer, a green light-emitting layer, a blue light-emitting layer, and an auxiliary layer that is below the blue light-emitting layer.

16. The organic light emitting diode display of claim 15, further comprising a red resonant auxiliary layer below the red light-emitting layer and a green resonant auxiliary layer below the green light-emitting layer.

17. The organic light emitting diode display of claim 15, wherein the auxiliary layer comprises a compound represented by Chemical Formula 1:

18. The organic light emitting diode display of claim 15, wherein the auxiliary layer comprises a compound represented by Chemical Formula 2: