EL device use front plate and lighting device

• US 10,763,456 B2
• Filed: 08/08/2016
• Issued: 09/01/2020
• Est. Priority Date: 02/07/2014
• Status: Active Grant

• Current Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Original Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Inventors: Kagotani, Akihito
• Primary Examiner(s): Mandala, Michelle
• Assistant Examiner(s): Klein, Jordan M
• Application Number:
  US15/230,554
• Publication Number:
  US 20160343991A1
• Time in Patent Office: 1,485 Days
• Field of Search: None
• CPC Class Codes: G02B 1/115 Multilayers
• CPC Class Codes: H05B 33/24 of metallic reflective layers H05B33/26 takes precedence
• CPC Class Codes: H05B 33/28 of translucent electrodes
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/854 comprising scattering means
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00

Abstract

A front plate for a lighting device includes a translucent substrate having a first surface, a high refractive index layer formed on the first surface of the translucent substrate and having a refractive index higher than a refractive index of the translucent substrate, and an electrically conductive light reflection layer formed on a surface of the high refractive index layer on an opposite side of the translucent substrate. The electrically conductive light reflection layer is formed on a portion corresponding to a non-luminous region around a luminous region on the surface of the high refractive index layer.

Claims

1. A lighting device, comprising:

a front plate comprising a translucent substrate, a high refractive index layer formed on a first surface of the translucent substrate, a transparent anode formed on the high refractive index layer on an opposite side of the translucent substrate, and an electrically conductive light reflection layer formed on a back surface of the transparent anode on an opposite side of the high refractive index layer and having a plurality of opening portions;

a light emitting element formed on the back surface of the transparent anode such that the light emitting element has part formed in the opening portions of the electrically conductive light reflection layer; and

a cathode formed on the light emitting element on an opposite side of the electrically conductive light reflection layer,

wherein each of the opening portions has a bottom formed through a surface of the electrically conductive light reflection layer on the back surface of the transparent anode on the opposite side of the high refractive index layer and forms a luminous region on the back surface of the transparent anode, and the electrically conductive light reflection layer forms a non-luminous region around the luminous region on the back surface of the transparent anode.

2. The lighting device of claim 1, further comprising:

an electrically insulating layer covering the electrically conductive light reflection layer formed on the transparent anode.

3. The lighting device of claim 2, wherein the high refractive index layer includes a plurality of fine particles having light scattering property.

4. The lighting device of claim 2, wherein the translucent substrate has a micro-concavo-convex structure on a second surface opposite to the first surface.

5. The lighting device of claim 2, wherein the high refractive index layer has a refractive index of 1.5 or more.

6. The lighting device of claim 2, wherein the translucent substrate includes a plurality of fine particles having light scattering property.

7. The lighting device of claim 1, wherein the high refractive index layer includes a plurality of fine particles having light scattering property.

8. The lighting device of claim 7, wherein the translucent substrate has a micro-concavo-convex structure on a second surface opposite to the first surface.

9. The lighting device of claim 7, wherein the high refractive index layer has a refractive index of 1.5 or more.

10. The lighting device of claim 7, wherein the translucent substrate includes a plurality of fine particles having light scattering property.

11. The lighting device of claim 1, wherein the translucent substrate has a micro-concavo-convex structure on a second surface opposite to the first surface.

12. The lighting device of claim 11, wherein the high refractive index layer has a refractive index of 1.5 or more.

13. The lighting device of claim 11, wherein the translucent substrate includes a plurality of fine particles having light scattering property.

14. The lighting device of claim 1, wherein the high refractive index layer has a refractive index of 1.5 or more.

15. The lighting device of claim 1, wherein the translucent substrate includes a plurality of fine particles having light scattering property.

16. The lighting device of claim 1, wherein the surface of the electrically conductive light reflection layer on the back surface of the transparent anode has an arithmetic average roughness in a range of 100 μ

m to 500 μ

m.

17. The lighting device of claim 1, wherein the transparent anode comprises ITO.

18. The lighting device of claim 1, wherein the transparent anode comprises a conductive polymer.

19. The lighting device of claim 1, wherein the electrically conductive light reflection layer comprises at least one selected from the group consisting of Mo, Ni, Al and Ag.

20. The lighting device of claim 1, wherein the light emitting element is formed such that the luminous region satisfies B>

(A/2) where B is a thickness from the light emitting element to the translucent substrate, and A is a diameter of the luminous region.

21. The lighting device of claim 1, wherein the high refractive index layer includes a plurality of fine particles having light scattering property in an amount of 40 w % or less.

22. The lighting device of claim 1, wherein the high refractive index layer has a refractive index in a range of 1.5 to 2.0.

23. The lighting device of claim 1, wherein the high refractive index layer has a refractive index in a range of 1.7 to 1.85.

24. The lighting device of claim 1, wherein the electrically conductive light reflection layer has the plurality of opening portions arrayed in a lattice pattern and formed such that each of the opening portions has a rectangular shape.

25. The lighting device of claim 1, wherein the electrically conductive light reflection layer has the plurality of opening portions arrayed in a staggered pattern and formed such that each of the opening portions has a rectangular shape.

26. The lighting device of claim 1, wherein the electrically conductive light reflection layer has the plurality of opening portions arrayed in a honeycomb pattern and formed such that each of the opening portions has a circular shape.