Light emitting unit, display, and lighting apparatus

Patent metadata

Field	Value
Publication number	US-9915769-B2
Application number	US-201615212848-A
Country	US
Kind code	B2
Filing date	Jul 18, 2016
Priority date	Apr 11, 2012
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

There are provided a light emitting unit that enhances the uniformity of in-plane colors, as well as a display and a lighting apparatus that include such a light emitting unit thereon. The light emitting unit includes: a plurality of light emitting sections each having a light source and a wavelength conversion member, the wavelength conversion member converting a wavelength of light emitted from the light source; an optical component having a light incident surface in opposition to the plurality of light emitting sections; and a color unevenness prevention structure suppressing direct entering of light from the light source into the optical component.

First claim

What is claimed is:

1. A light emitting unit, comprising:
a plurality of light emitting sections each having a light source and a wavelength conversion member, wherein each said light source is configured to emit light at a first wavelength, and wherein each said wavelength conversion member includes a wavelength conversion material and is configured to convert the first wavelength of the emitted light;
an optical guide component having a light incident surface in opposition to the plurality of light emitting sections; and
a prevention structure configured to suppress the emitted light at the first wavelength from entering into the optical guide component,
wherein the prevention structure includes a wavelength conversion section, is disposed between the wavelength conversion members adjacent to each other, and is spaced from and confronts a respective end of each of the adjacent wavelength conversion members.

2. The light emitting unit according to claim 1 , wherein the prevention structure absorbs the emitted light having the first wavelength heading directly toward the optical guide component.

3. The light emitting unit according to claim 1 , wherein the prevention structure is a color unevenness prevention structure composed of the wavelength conversion section.

4. The light emitting unit according to claim 1 , wherein the prevention structure includes a wavelength conversion film containing a fluorescent painting material.

5. The light emitting unit according to claim 1 , wherein the wavelength conversion member includes quantum dots.

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

7. The light emitting unit according to claim 1 , wherein the light source is a blue-color light source.

8. The light emitting unit according to claim 1 , wherein the light source is an LED.

9. The light emitting unit according to claim 1 , wherein each said wavelength conversion member is sealed in a tubular container.

10. The light emitting unit according to claim 9 , wherein each said tubular container is made of glass.

11. The light emitting unit according to claim 1 , in which the prevention structure has a number of circular concave sections, each concave section being configured in relation to the respective end of a respective one of the adjacent wavelength conversion members.

12. The light emitting unit according to claim 1 , in which the wavelength conversion member is configured to absorb blue-color light emitted from the light source to convert a part of the blue-color light into red-color light or green-color light so that the light emitted from the light source passes through the wavelength conversion member, in which the wavelength conversion member is configured to synthesize given red-color light, given green-color light, and given blue-color light to generate white-color light.

13. The light emitting unit according to claim 12 , in which the red-color light has a wavelength in a range from about 620 nm to about 750 nm and the green-color light has a wavelength in a range from about 495 nm to about 570 nm.

Assignees

• Saturn Licensing Llc

Inventors

• Ohkawa Shingo
• Nakamura Tomoharu
• Yonezawa Gen

Classifications

• G02B6/0055 Primary

  Reflecting element, sheet or layer · CPC title

• G02B6/0031 Primary

  Reflecting element, sheet or layer · CPC title

• G02B6/0026

  Wavelength selective element, sheet or layer, e.g. filter or grating · CPC title

• G02F1/133615 Primary

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

• F21K9/64

  using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer · CPC title