Light emitting unit, display, and lighting apparatus

Patent metadata

Field	Value
Publication number	US-10488572-B2
Application number	US-201815880083-A
Country	US
Kind code	B2
Filing date	Jan 25, 2018
Priority date	Apr 11, 2012
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

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 display comprising:
a liquid crystal display panel; and
a lighting apparatus positioned on a rear side of the liquid crystal display panel,
wherein the lighting apparatus comprises:
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, the wavelength conversion member including a wavelength conversion material that includes quantum dots;
an optical component having a light incident surface in opposition to the plurality of light emitting sections, in which the optical component includes a light emission surface that faces the rear side of the liquid crystal display panel and is perpendicular to the light incident surface, in which the light emission surface has an uneven pattern; and
a prevention structure suppressing entry of light from a first light emitting section into an adjacent light emitting section, and in which the prevention structure has a number of concave sections, each concave section being configured in relation to a respective end of a respective one of plurality of light emitting sections.

2. The display of claim 1 , wherein the wavelength conversion material is sealed in a tubular container.

3. The display of claim 2 , wherein the prevention structure includes a wavelength conversion section between the wavelength conversion members adjacent to each other, in which the wavelength conversion section is a wavelength conversion film covering each end of the container adjacent to each other and containing a fluorescent material.

4. The display of claim 3 , wherein the uneven pattern of the optical component comprises convex sections.

5. A display comprising:
a liquid crystal display panel; and
a lighting apparatus positioned on a rear side of the liquid crystal display panel,
wherein the lighting apparatus comprises:
light sources and a wavelength conversion member, the wavelength conversion member converting a wavelength of light emitted from the light sources, the wavelength conversion member including a wavelength conversion material that includes quantum dots;
an optical component having a light incident surface in opposition to the light sources, in which the optical component includes a light emission surface that faces the rear side of the liquid crystal display panel;
at least one light source substrate that supports the light sources; and
a prevention structure having one or more concave sections, the prevention structure being arranged relative to a first light source and associated first wavelength conversion member such that light from the first light source is prevented from being absorbed by neighboring conversion member regions.

6. The display of claim 5 , wherein the light emission surface has an uneven pattern.

7. The display of claim 6 , wherein the uneven pattern of the optical component comprises convex sections.

8. The display of claim 5 , wherein the light sources are light emitting diodes that generate blue light.

9. The display of claim 8 , wherein the at least one light source substrate has a wiring pattern.

10. The display of claim 9 , wherein the optical component is a waveguide.

11. 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 in a first wavelength range, and wherein each said wavelength conversion member includes a wavelength conversion material and is configured to convert the emitted light in the first wavelength range;
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 in the first wavelength range from entering into the optical guide component,
wherein the prevention structure includes a wavelength conversion section disposed between at least a pair of adjacent wavelength conversion members, and the wavelength conversion member is spaced from and confronts a respective end of each of the adjacent wavelength conversion members, and 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 11 , wherein the prevention structure absorbs the emitted light in the first wavelength range heading directly toward the optical guide component.

13. The light emitting unit according to claim 11 , wherein the prevention structure is a color unevenness prevention structure composed of the wavelength conversion section.

14. The light emitting unit according to claim 11 , wherein the prevention structure includes a wavelength conversion film containing a fluorescent painting material.

15. The light emitting unit according to claim 11 , wherein the wavelength conversion member includes quantum dots.

16. The light emitting unit according to claim 11 , wherein the optical guide component is a light guide plate, and the light incident surface is an end surface of the light guide plate.

17. The light emitting unit according to claim 11 , wherein the light source is a blue-color light source.

18. The light emitting unit according to claim 11 , wherein the light source is an LED.

19. The light emitting unit according to claim 11 , wherein each said wavelength conversion member is sealed in a tubular container.

20. The light emitting unit according to claim 19 , wherein each said tubular container is made of glass.

21. The light emitting unit according to claim 11 , 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 light in a red-color light range or a green-color light range 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 light in a given red-color light range, given light in a given green-color light range, and given light in a given blue-color light range to generate white-color light.

22. The light emitting unit according to claim 21 , in which the red-color light range is a wavelength range from about 620 nm to about 750 nm and the green-color light range is a wavelength range from about 495 nm to about 570 nm.

Assignees

• Saturn Licensing Llc

Inventors

• Ohkawa Shingo
• Nakamura Tomoharu
• Yonezawa Gen

Classifications

• F21K9/64

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

• G02B6/0026

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

• G02B6/0055 Primary

  Reflecting element, sheet or layer · CPC title

• G02F1/133615 Primary

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

• G02B6/0031 Primary

  Reflecting element, sheet or layer · CPC title