Light-Emitting Device and Lighting Device

• US 20120020085A1
• Filed: 07/25/2011
• Published: 01/26/2012
• Est. Priority Date: 07/26/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Ikeda, Hisao, Kawata, Takuya
• Granted Patent: US 8,455,884 B2
• Time in Patent Office: Days
• US Class Current: 362/249.01
• CPC Class Codes: F21S 6/003 for task lighting, e.g. for reading or desk work, e.g. angle poise lamps
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F21Y 2115/15 Organic light-emitting diodes [OLED]
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses

Abstract

It is an object to improve light extraction efficiency in a light-emitting device and a lighting device. A light-emitting device includes a plurality of light-emitting portions, and a plurality of hemispherical components provided so as to overlap with the plurality of light-emitting portions. The plurality of hemispherical components are provided so as not to form a space therebetween in a region where the plurality of hemispherical components are adjacent to each other. When a refractive index of the hemispherical component is n and a radius of a bottom surface of the hemispherical component is b, the light-emitting portion is provided inside a circle whose radius r from a center of the bottom surface of the hemispherical component is b/n.

Claims

1. A light-emitting device comprising:

a plurality of light-emitting portions; and

a plurality of hemispherical components provided so as to overlap with their respective light-emitting portions,

wherein the plurality of hemispherical components are provided so as not to form a space therebetween in a region where the plurality of hemispherical components are adjacent to each other.

2. The light-emitting device according to claim 1, further comprising:

a plate-like component,

wherein the plurality of light-emitting portions are provided over one surface of the plate-like component, and

wherein the plurality of hemispherical components are provided over the other surface of the plate-like component.

3. The light-emitting device according to claim 2,

wherein the plate-like component comprises glass, and

wherein each of the plurality of hemispherical components comprises resin.

4. A lighting device comprising the light-emitting device according to claim 1.

5. A light-emitting device comprising:

a plurality of light-emitting portions; and

a plurality of hemispherical components provided so as to overlap with their respective light-emitting portions,

wherein the plurality of hemispherical components are arranged with a closest packed structure.

6. The light-emitting device according to claim 5 further comprising:

a plate-like component,

wherein the plurality of light-emitting portions are provided over one surface of the plate-like component, and

wherein the plurality of hemispherical components are provided over the other surface of the plate-like component.

7. The light-emitting device according to claim 6,

wherein the plate-like component comprises glass, and

wherein each of the plurality of hemispherical components comprises resin.

8. A lighting device comprising the light-emitting device according to claim 5.

9. A light-emitting device comprising:

a light-emitting portion; and

a hemispherical component provided so as to overlap with the light-emitting portion,

wherein a refractive index of the hemispherical component is n and a radius of a bottom surface of the hemispherical component is b, and

wherein the light-emitting portion is provided inside a circle whose radius r from a center of the bottom surface of the hemispherical component is b/n.

10. The light-emitting device according to claim 9, further comprising:

a plate-like component,

wherein the light-emitting portion is provided over one surface of the plate-like component, and

wherein the hemispherical component is provided over the other surface of the plate-like component.

11. The light-emitting device according to claim 10,

wherein the plate-like component comprises glass, and

wherein the hemispherical component comprises resin.

12. A lighting device comprising the light-emitting device according to claim 9.

13. A light-emitting device comprising:

a plurality of light-emitting portions; and

a plurality of hemispherical components provided so as to overlap with their respective light-emitting portions,

wherein a refractive index of each of the plurality of hemispherical components is n and a radius of a bottom surface of each of the plurality of hemispherical components is b, and

wherein each of the plurality of light-emitting portions is provided inside a circle whose radius r from a center of the bottom surface of each of the plurality of hemispherical components is b/n.

14. The light-emitting device according to claim 13, wherein the plurality of hemispherical components are arranged with a closest packed structure.

15. A lighting device comprising the light-emitting device according to claim 13.

16. A light-emitting device comprising:

a plate-like component;

a plurality of light-emitting portions provided over one surface of the plate-like component; and

a plurality of hemispherical components provided over the other surface of the plate-like component so as to overlap with their respective light-emitting portions with the plate-like component interposed therebetween,

wherein a refractive index of each of the plurality of hemispherical components is n and a radius of a bottom surface of each of the plurality of hemispherical components is b, and

wherein each of the plurality of light-emitting portions is provided inside a circle whose radius r from a center of the bottom surface of each of the plurality of hemispherical components is b/n.

17. The light-emitting device according to claim 16,

wherein the plate-like component comprises glass, and

wherein each of the plurality of hemispherical components comprises resin.

18. The light-emitting device according to claim 16, wherein the plurality of hemispherical components are arranged with a closest packed structure.

19. A lighting device comprising the light-emitting device according to claim 16.