Backlight device

Patent metadata

Field	Value
Publication number	US-9841552-B2
Application number	US-201514869171-A
Country	US
Kind code	B2
Filing date	Sep 29, 2015
Priority date	Sep 30, 2014
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

A backlight device includes a light guide plate having an incident surface, a first side surface, and a second side surface. The first side surface extends from a first end of the incident surface and the second side surface extends from a second end of the incident surface. A green illuminant faces the incident surface and emits a green light toward the incident surface. A red illuminant faces the incident surface and emits a red light toward the incident surface. A white illuminant disposed on a side of at least one end of the first and second ends of the incident surface emits a white light toward the light guide plate. At least one of the emitted green light and the emitted red light includes a blue component having an emission peak wavelength in a range of 420 to 500 nm.

First claim

What is claimed is:

1. A backlight device comprising:
a case having a first sidewall and a second sidewall opposed to each other;
a light guide plate having an incident surface, a first side surface, and a second side surface, the first side surface extending from a first end of the incident surface and the second side surface extending from a second end of the incident surface, the light guide plate being located in the case such that the first side surface faces the first sidewall and the second side surface faces the second sidewall;
a green illuminant disposed facing the incident surface and configured to emit green light toward the incident surface;
a red illuminant disposed facing the incident surface and configured to emit red light toward the incident surface; and
a white illuminant disposed on a side of at least one of the first end and the second end of the incident surface and configured to emit white light toward the light guide plate,
wherein at least one of the green light emitted from the green illuminant and the red light emitted from the red illuminant includes a blue component having an emission peak wavelength in a range of 420 to 500 nm, and
wherein an inner surface of the first sidewall and an inner surface of the second sidewall are white in color.

2. The backlight device according to claim 1 , wherein
the white illuminant is disposed facing the incident surface.

3. The backlight device according to claim 1 , wherein
at least one of the green illuminant and the red illuminant includes a blue light emitting element.

4. The backlight device according to claim 1 , wherein
the green illuminant, the red illuminant, and the white illuminant are disposed facing the incident surface, and
an interval between ends of adjacent illuminants is in a range of 1.3 mm to 3.5 mm.

5. The backlight device according to claim 1 , wherein
the white illuminant is disposed facing the first side surface or the second side surface.

6. The backlight device according to claim 1 , wherein
the green illuminant includes at least one green phosphor selected from a group consisting of a β-type sialon-based phosphor, a chlorosilicate-based phosphor, and a LAG-based phosphor.

7. The backlight device according to claim 1 , wherein
the red illuminant includes at least one red phosphor selected from a group consisting of a CASN-based phosphor, a SCASN-based phosphor, and a KSF phosphor.

8. The backlight device according to claim 1 , wherein
at least one of the green illuminant and the red illuminant includes an ultraviolet light emitting element.

9. A backlight device comprising:
a light guide plate having an incident surface, a first side surface, and a second side surface, the first side surface extending from a first end of the incident surface and the second side surface extending from a second end of the incident surface;
a green illuminant disposed facing the incident surface and configured to emit green light toward the incident surface;
a red illuminant disposed facing the incident surface and configured to emit red light toward the incident surface; and
a white illuminant disposed on a side of at least one of the first end and the second end of the incident surface and configured to emit white light toward the light guide plate,
wherein at least one of the green light emitted from the green illuminant and the red light emitted from the red illuminant includes a blue component having an emission peak wavelength in a range of 420 to 500 nm, and
wherein at least one of the green illuminant and the red illuminant includes an ultraviolet light emitting element.

10. The backlight device according to claim 9 , wherein
the white illuminant is disposed facing the incident surface.

11. The backlight device according to claim 9 , wherein
at least one of the green illuminant and the red illuminant includes a blue light emitting element.

12. The backlight device according to claim 9 , wherein
the green illuminant, the red illuminant, and the white illuminant are disposed facing the incident surface, and
an interval between ends of adjacent illuminants is in a range of 1.3 mm to 3.5 mm.

13. The backlight device according to claim 9 , wherein
the white illuminant is disposed facing the first side surface or the second side surface.

14. The backlight device according to claim 9 , wherein
the green illuminant includes at least one green phosphor selected from a group consisting of a β-type sialon-based phosphor, a chlorosilicate-based phosphor, and a LAG-based phosphor.

15. The backlight device according to claim 9 , wherein
the red illuminant includes at least one red phosphor selected from a group consisting of a CASN-based phosphor, a SCASN-based phosphor, and a KSF phosphor.

Assignees

• Nichia Corp

Inventors

• Achi Yusaku
• Iwakura Daisuke

Classifications

• G02B6/0068 Primary

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title

• G02B6/0023

  provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source · CPC title