Lighting device

• US 9,553,281 B2
• Filed: 11/15/2011
• Issued: 01/24/2017
• Est. Priority Date: 11/19/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Seo, Satoshi, Ikeda, Hisao, Aoyama, Tomoya
• Primary Examiner(s): Neils, Peggy
• Assistant Examiner(s): TUMEBO, TSION M
• Application Number:
  US13/296,589
• Publication Number:
  US 20120126268A1
• Time in Patent Office: 1,897 Days
• Field of Search: 362/311.06, 359/726, 359/727, 359/728, 359/729, 359/730
• US Class Current: 1/1
• CPC Class Codes: F21S 6/003 for task lighting, e.g. for reading or desk work, e.g. angle poise lamps
• CPC Class Codes: F21S 8/04 intended only for mounting on a ceiling or the like overhead structures F21S8/02 takes precedence; details of ceiling bases F21V21/03
• CPC Class Codes: F21V 5/045 the lens having discontinuous faces, e.g. Fresnel lenses
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2115/15 Organic light-emitting diodes [OLED]
• CPC Class Codes: F21Y 2115/20 Electroluminescent [EL] light sources
• CPC Class Codes: G02B 3/0056 arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085
• CPC Class Codes: G02B 3/08 with discontinuous faces, e.g. Fresnel lens diffractive Fresnel lenses G02B5/1876
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses

Abstract

A lighting device is provided with a structure body which has an inner surface including a region with a negative Fresnel lens shape and a high refractive index material layer which is closely in contact with the inner surface. The high refractive index material layer has a Fresnel lens shape in a region closely in contact with the inner surface, and a plane light-emitting body is provided over the structure body with the high refractive index material layer interposed therebetween. The high refractive index material layer is provided so as to fill at least the negative Fresnel lens shape of the structure body and thus has a surface including the region with the Fresnel lens shape at the interface with the structure body.

Claims

1. A lighting device comprising:

a structure body including a first surface and a second surface which is opposite to the first surface of the structure body, the structure body including a negative Fresnel lens shape on a region of the first surface of the structure body;

a layer including a first surface and a second surface which is opposite to the first surface of the layer, the first surface of the layer being in direct contact with the first surface of the structure body; and

a light-emitting body which is over the structure body with the layer interposed therebetween, the light-emitting body being in direct contact with the second surface of the layer,

wherein the light-emitting body comprises a first electrode, a second electrode, and a light-emitting layer interposed therebetween,

wherein the layer includes a Fresnel lens shape at an interface with the region of the first surface of the structure body,

wherein the layer comprises a resin which is cured,

wherein the structure body and the layer are capable of transmitting light,

wherein a refractive index of the layer and a refractive index of a light-emitting region in the light-emitting body are higher than a refractive index of the structure body by 0.1 or more, and

wherein the region of the first surface of the structure body and the light-emitting region are in a concentric pattern.

2. The lighting device according to claim 1,

wherein the refractive index of the layer is higher than or equal to a value which is 0.1 lower than the refractive index of the light-emitting region in the light-emitting body.

3. The lighting device according to claim 1,

wherein the refractive index of the layer is higher than or equal to the refractive index of the light-emitting region in the light-emitting body.

4. The lighting device according to claim 1,

wherein the refractive index of the layer is lower than or equal to a value which is 0.1 higher than the refractive index of the light-emitting region in the light-emitting body.

5. The lighting device according to claim 1,

wherein the second surface of the layer, which is on the light-emitting body side, is plane or substantially plane.

6. The lighting device according to claim 1,

wherein the light-emitting body is a plane light-emitting body which emits light utilizing organic electroluminescence.

7. The lighting device according to claim 1,

wherein the region with the negative Fresnel lens shape is larger than the light-emitting region.

25. The lighting device according to claim 1, wherein the resin comprises bromine or sulfur.

26. The lighting device according to claim 1, wherein the layer comprises an inorganic material film.

8. A lighting device comprising:

a structure body including a negative Fresnel lens shape on a region of a first surface of the structure body, and including a concave-convex shape on a region of a second surface opposite to the first surface of the structure body;

a layer including a first surface and a second surface which is opposite to the first surface of the layer, the first surface of the layer being in direct contact with the first surface of the structure body; and

a light-emitting body which is over the structure body with the layer interposed therebetween, the light-emitting body being in direct contact with the second surface of the layer,

wherein the light-emitting body comprises a first electrode, a second electrode, and a light-emitting layer interposed therebetween,

wherein the layer includes a Fresnel lens shape at an interface with the region of the first surface of the structure body,

wherein the layer comprises a resin which is cured,

wherein the structure body and the layer are capable of transmitting light, and

wherein a refractive index of the layer and a refractive index of a light-emitting region in the light-emitting body are higher than a refractive index of the structure body by 0.1 or more, and

wherein the region of the first surface of the structure body, the region of the second surface of the structure body, and the light-emitting region are in a concentric pattern.

9. The lighting device according to claim 8,

wherein the refractive index of the layer is higher than or equal to a value which is 0.1 lower than the refractive index of the light-emitting region in the light-emitting body.

10. The lighting device according to claim 8,

wherein the refractive index of the layer is higher than or equal to the refractive index of the light-emitting region in the light-emitting body.

11. The lighting device according to claim 8,

wherein the refractive index of the layer is lower than or equal to a value which is 0.1 higher than the refractive index of the light-emitting region in the light-emitting body.

12. The lighting device according to claim 8,

wherein the structure body includes a first member with the first surface including the region with the negative Fresnel lens shape and a second member with the second surface including the region with the concave-convex shape.

13. The lighting device according to claim 8,

wherein the structure body includes a first member with the first surface including the region with the negative Fresnel lens shape, a second member with the second surface including the region with the concave-convex shape, and a third member between the first member and the second member.

14. The lighting device according to claim 8,

wherein the second surface of the layer, which is on the light-emitting body side, is plane or substantially plane.

15. The lighting device according to claim 8,

wherein the region with the concave-convex shape is larger than the region with the negative Fresnel lens shape.

16. The lighting device according to claim 8,

wherein the concave-convex shape is a Fresnel lens shape.

17. The lighting device according to claim 8,

wherein the light-emitting body is a plane light-emitting body which emits light utilizing organic electroluminescence.

18. The lighting device according to claim 8,

wherein the region with the negative Fresnel lens shape is larger than the light-emitting region.

27. The lighting device according to claim 8, wherein the resin comprises bromine or sulfur.

28. The lighting device according to claim 8, wherein the layer comprises an inorganic material film.

19. A lighting device comprising:

a structure body including;

a first negative Fresnel lens shape on a first region of a first surface of the structure body;

a second negative Fresnel lens shape on a second region of the first surface of the structure body; and

a concave-convex shape on a third region of a second surface opposite to the first surface of the structure body;

a layer including a first surface and a second surface which is opposite to the first surface of the layer, the first surface of the layer being in direct contact with the first surface of the structure body;

a first light-emitting body which is over the first region of the structure body with the layer interposed therebetween; and

a second light-emitting body which is over the second region of the structure body with the layer interposed therebetween,

wherein the layer includes a first Fresnel lens shape at an interface with the first region of the first surface of the structure body, and a second Fresnel lens shape at an interface with the second region of the first surface of the structure body,

wherein each of the first light-emitting body and the second light-emitting body is in direct contact with the second surface of the layer,

wherein each of the first light-emitting body and the second light-emitting body comprises a first electrode, a second electrode, and a light-emitting layer interposed therebetween,

wherein the layer comprises a resin which is cured,

wherein the structure body and the layer are capable of transmitting light, and

wherein a refractive index of the layer and refractive indices of light-emitting regions in the first light-emitting body and the second light-emitting body are higher than a refractive index of the structure body by 0.1 or more, and

wherein the first region of the first surface of the structure body, the third region of the second surface of the structure body, and the light-emitting region in the first light-emitting body are in a concentric pattern.

20. The lighting device according to claim 19,

wherein the refractive index of the layer is higher than or equal to a value which is 0.1 lower than the refractive indices of the light-emitting regions in the first light-emitting body and the second light-emitting body.

21. The lighting device according to claim 19,

wherein the refractive index of the layer is higher than or equal to the refractive indices of the light-emitting regions in the first light-emitting body and the second light-emitting body.

22. The lighting device according to claim 19,

wherein the refractive index of the layer is lower than or equal to a value which is 0.1 higher than the refractive indices of the light-emitting regions in the first light-emitting body and the second light-emitting body.

23. The lighting device according to claim 19,

wherein the second surface of the layer, which is on the first light-emitting body side, is plane or substantially plane.

24. The lighting device according to claim 19,

wherein each of the first light-emitting body and the second light-emitting body is a plane light-emitting body which emits light utilizing organic electroluminescence.

29. The lighting device according to claim 19, wherein the resin comprises bromine or sulfur.

30. The lighting device according to claim 19, wherein the layer comprises an inorganic material film.