Lighting device and display device

Patent metadata

Field	Value
Publication number	US-10754195-B2
Application number	US-201916240627-A
Country	US
Kind code	B2
Filing date	Jan 4, 2019
Priority date	Jan 10, 2018
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

The lighting device includes a light source, a light transmissive plate opposed to the light source, a light reflecting portion disposed on the light transmissive plate and providing at least transmitted light with a specific tint, and a coloring portion disposed on the light source and/or the light transmissive plate. The light transmissive plate includes a light source overlapping region and a light source peripheral region. The light reflecting portion is disposed with a higher distribution density in the light source overlapping region than in the light source peripheral region. The coloring portion colors light travelling from the light source toward the light source overlapping region with a tint having a complementary relationship with the specific tint, or colors light travelling from the light source toward the light source peripheral region with a tint having a corresponding or similar color relationship with the specific tint.

First claim

The invention claimed is:

1. A lighting device comprising:
a light source;
a light transmissive plate opposed to the light source with an interval therebetween and being transmissive to light;
a plurality of light reflecting portions disposed on a plate surface of the light transmissive plate, having a higher optical reflectance than an optical transmittance, and providing at least transmitted light with a specific tint; and
a coloring portion disposed on at least one of the light source and the light transmissive plate, wherein
the light transmissive plate is sectioned into a light source overlapping region overlapping the light source and a light source peripheral region disposed around the light source overlapping region,
the plurality of light reflecting portions comprises reflecting dots and the distribution density of the reflecting dots is higher in the light source overlapping region than in the light source peripheral region, and
the coloring portion colors light travelling from the light source toward the light source peripheral region with a tint having a corresponding or similar color relationship with the specific tint.

2. The lighting device according to claim 1 , further comprising another coloring portion disposed on at least one of the light source and the light transmissive plate, wherein
the another coloring portion colors the light travelling from the light source toward the light source overlapping region with a tint having a complementary relationship with the specific tint.

3. The lighting device according to claim 1 , wherein the plurality of light reflecting portions and the coloring portion have substantially the same wavelength dependency with respect to optical transmittance.

4. The lighting device according to claim 1 , wherein the coloring portion includes a pigment that selectively absorbs light of a specific wavelength region.

5. The lighting device according to claim 1 , wherein the coloring portion includes a dielectric multilayer film that selectively reflects light of a specific wavelength region.

6. The lighting device according to claim 1 , wherein the coloring portion is disposed on the light source.

7. The lighting device according to claim 6 , wherein
the light source includes a top light emitting surface emitting light mainly directed to the light source overlapping region, and a side light emitting surface emitting light mainly directed to the light source peripheral region, and
the coloring portion is disposed on the top light emitting surface or the side light emitting surface.

8. The lighting device according to claim 1 , wherein the coloring portion is disposed on the light transmissive plate.

9. The lighting device according to claim 8 , wherein the coloring portion and the light reflecting portion are disposed on a same plate surface of the light transmissive plate.

10. The lighting device according to claim 9 , wherein the coloring portion is disposed in a region of the light transmissive plate in which the light reflecting portion is not formed.

11. A display device comprising:
the lighting device according to claim 1 ; and
a display panel displaying an image using light irradiated from the lighting device.

Assignees

• Sharp Kk

Inventors

• Yasunaga Hirotoshi
• Watanabe Hisashi
• Kyoukane Youzou

Classifications

• G02F2203/055

  wavelength filtering · CPC title

• G02F1/1336

  Illuminating devices · CPC title

• G02F1/133605

  including specially adapted reflectors · CPC title

• G02F1/133603 Primary

  with LEDs · CPC title

• G02F1/133609 Primary

  including means for improving the color mixing, e.g. white · CPC title