Lighting device, display device, and television device

Patent metadata

Field	Value
Publication number	US-2018045874-A1
Application number	US-201615554459-A
Country	US
Kind code	A1
Filing date	Mar 11, 2016
Priority date	Mar 18, 2015
Publication date	Feb 15, 2018
Grant date	—

Abstract

A lighting device includes a light source line, a light guide plate, and a wavelength converting member. The light source line includes an inner light source and outer light sources. The inner light source is disposed in the middle and configured to emit primary light rays in a predefined wavelength range. The outer light sources are disposed outer than the inner light source and configured to emit primary light rays and complementary color light rays. The light guide plate includes a light entering surface and a light exiting surface. The wavelength converting member contains first phosphors configured to emit secondary light rays in a wavelength range different from the wavelength range when excited by the primary light rays. The wavelength converting member is disposed to cover the light exiting surface and configured to pass some of the primary light rays and to release planar light.

First claim

1 . A lighting device comprising:
a light source line including light sources, the light sources include:
an inner light source disposed in a middle of the light source line and configured to emit primary light rays in a predefined wavelength range; and
outer light sources disposed closer to ends of the light source line than the inner light source, respectively, the outer light sources being configured to emit the primary light rays and complementary color light rays exhibiting a color that makes a complementary color pair with a reference color exhibited by the primary light rays;
a light guide plate including:
a light entering surface through which the light rays from the inner light source and the outer light sources enter, the light entering surface being opposed to the light source line; and
a light exiting surface through which the light rays entering through the light entering surface exit; and
a wavelength converting member containing first phosphors configured to emit secondary light rays in a wavelength range different from the wavelength range when excited by the primary light rays, the wavelength converting member being disposed to cover the light exiting surface and configured to pass some of the primary light rays and to release planar light.

2 . The lighting device according to claim 1 , wherein the outer light sources include:
reference light sources configured to emit primary light rays; and wavelength converting members formed to cover the reference light sources, the wavelength converting members being configured to pass the first light rays and containing second phosphors configured to release the secondary light rays when excited by some of the primary light rays.

3 . The lighting device according to claim 2 , wherein the wavelength converting members are films containing the second phosphors.

4 . The lighting device according to claim 1 , wherein the outer light sources are configured to emit whitish light rays.

5 . The lighting device according to claim 1 , wherein
the outer light sources are arranged in line, and the outer light sources are configured such that the light rays emitted therefrom become more whitish from a middle of the light source line toward ends of the light source line.

6 . The lighting device according to claim 2 , wherein the inner light source and the reference light sources of the outer light sources are the same type.

7 . The lighting device according to claim 1 , wherein
the primary light rays are blue light rays, the wavelength converting member contains at least green phosphors and red phosphors for the first phosphors, the green phosphors are configured to release green light rays as the second light rays when excited by the blue light rays that are the primary light rays, the red phosphors are configured to release red light rays as the second light rays when excited by the blue light rays that are the primary light rays, and the complementary color light rays emitted by the outer light sources are yellow light rays.

8 . The lighting device according to claim 3 , wherein the wavelength converting members of the outer light sources contain at least second green phosphors and second red phosphors for the second phosphors,
the second green phosphors are configured to release green light rays when excited by blue light rays, and the second red phosphors are configured to release red light rays when excited by the blue light rays.

9 . The lighting device according to claim 1 , wherein the wavelength converting member includes quantum dot phosphors for the first phosphors.

10 . The lighting device according to claim 1 , further comprising a reflective-type polarizing member disposed to cover the wavelength converting member.

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

12 . The display device according to claim 11 , wherein the display panel is a liquid crystal display panel.

13 . A television device comprising the display device according to claim 11 .

Assignees

• Sharp Kk

Inventors

• Matsui Keitaro
• Harada Masanobu

Classifications

• G02B6/0055

  Reflecting element, sheet or layer · CPC title

• G02F2001/133614

  Physics · mapped topic

• G02B6/0056

  for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02B6/009

  of the light source in the package (G02B6/0021 takes precedence) · CPC title