Light emitting device, display unit, and illumination unit

Patent metadata

Field	Value
Publication number	US-9239418-B2
Application number	US-201514797349-A
Country	US
Kind code	B2
Filing date	Jul 13, 2015
Priority date	Apr 11, 2012
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

A light emitting device includes: a light source; an optical component including a light incident surface, the light incident surface facing the light source; and a wavelength conversion member provided between the light source and the light incident surface, the wavelength conversion member crossing a first region and extending to a second region outside the first region, the first region being surrounded by the light incident surface and light paths of light that is emitted from the light source and enters edges of the light incident surface.

First claim

What is claimed is:

1. A light emitting device comprising:
a plurality of light sources;
an optical component including a light incident surface, the light incident surface facing the plurality of light sources; and
a wavelength conversion member to convert a wavelength of at least a portion of light emitted from at least one light source of the light sources from a first wavelength to a second wavelength which is different from the first wavelength, said wavelength conversion member being provided between the at least one light source and the light incident surface, the wavelength conversion member crossing a first region and extending to a second region outside the first region, the first region being surrounded by the light incident surface and light paths of light that is emitted from the at least one light source and enters edges of the light incident surface,
the at least one light source is a first light source, and
the wavelength conversion member is configured to convert the wavelength of at least the portion of first light emitted from the first light source from the first wavelength which corresponds to the first light to the second wavelength which corresponds to either second light or third light, so as to convert the first light into either the second light or the third light.

2. The light emitting device according to claim 1 , further comprising
a container containing the wavelength conversion member.

3. The light emitting device according to claim 2 , further comprising
a light shielding member provided on a light path of light that is emitted from a first light source of the light sources, passes through the container without passing through the wavelength conversion member, and travels toward an end of a light emitting surface of the optical component.

4. The light emitting device according to claim 3 , wherein the light shielding member is a light shielding cushion covering the end of the light emitting surface of the optical component.

5. The light emitting device according to claim 4 , further comprising:
an optical sheet provided at the light emitting surface of the optical component; and
a frame-like member holding the optical sheet, wherein
the light shielding cushion is sandwiched between the frame-like member and the optical component.

6. The light emitting device according to claim 4 , further comprising:
a reflection member provided at the light emitting surface of the optical component; and
a frame-like member holding the wavelength conversion member and extending over the light emitting surface of the optical component, wherein
the light shielding cushion is sandwiched between the frame-like member and the reflection member.

7. The light emitting device according to claim 1 , wherein the at least one light source is a point light source.

8. The light emitting device according to claim 1 , wherein the wavelength conversion member includes a fluorescent material.

9. The light emitting device according to claim 1 , wherein the wavelength conversion member includes at least one quantum dot.

10. The light emitting device according to claim 9 , wherein the wavelength conversion member includes a quantum dot for each of the least one light source.

11. The light emitting device according to claim 1 , wherein the at least one light source is configured of a light emitting diode.

12. The light emitting device according to claim 1 , wherein
the optical component is a light guide plate, and
the light incident surface is an end face of the light guide plate.

13. The light emitting device according to claim 1 , wherein the wavelength conversion member includes a sheet in which a quantum dot is dispersed.

14. The light emitting device according to claim 1 , wherein the wavelength conversion member includes a sheet in which a fluorescent material is dispersed.

15. The light emitting device according to claim 1 , wherein the device is a direct type light emitting device.

16. The light emitting device according to claim 1 , wherein the device is an edge-light type light emitting device.

17. The light emitting device according to claim 1 , wherein the at least one light source is a laser light source.

18. The light emitting device according to claim 1 , further comprising:
a reflection member provided at a light emitting surface of the optical component, wherein an end of the reflection member extends over and away from light incident surface of the optical component toward the plurality of light sources.

Assignees

• Sony Corp

Inventors

• Nakamura Tomoharu
• Shimizu Kazue
• Yonezawa Gen
• Ohkawa Shingo

Classifications

• G02F1/133603

  with LEDs · CPC title

• G02B6/0055

  Reflecting element, sheet or layer · CPC title

• Y10S977/774

  Exhibiting three-dimensional carrier confinement, e.g. quantum dots · CPC title

• G02F1/133615 Primary

  Edge-illuminating devices, i.e. illuminating from the side · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title