Lighting device, display device, and television device

Patent metadata

Field	Value
Publication number	US-10371877-B2
Application number	US-201615744855-A
Country	US
Kind code	B2
Filing date	Sep 23, 2016
Priority date	Sep 24, 2015
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

A lighting device includes a light source array, a wavelength converting member, and a light guide plate. The light source array includes light sources configured to emit primary light rays. The wavelength converting member includes a wavelength converting portion, a holding portion, and non-wavelength converting portions. The wavelength converting portion contains phosphors configured to emit secondary light rays when excited by the primary light rays. The wavelength converting member is disposed between the light guide plate and the light source array. The light guide plate includes a light entering surface, a light exiting surface, an opposite surface that is on an opposite side from the light exiting surface, and a light reflecting and scattering pattern. The light reflecting and scattering pattern includes complementary color dots formed in sections of the opposite surface on non-wavelength converting portion sides. The complementary color dots absorb the primary light rays.

First claim

The invention claimed is:

1. A lighting device comprising:
a light source array comprising a plurality of light sources configured to emit primary light rays in a predefined wavelength range and arranged in line; and
at least one wavelength converting member disposed along a length direction of the light source array to he opposed to the light source array, the at least one wavelength converting member comprising:
a wavelength converting portion containing phosphors configured to emit secondary light rays in a wavelength range different from the wavelength range when excited by blue light rays;
a holding portion holding the wavelength converting portion to surround the wavelength converting portion and having light transmissivity and an elongated shape; and
a non-wavelength converting portion formed at an end of the holding portion with respect to a longitudinal direction of the holding portion and configured to pass the primary light rays emitted by the light sources; and

a light guide plate, wherein
the at least one wavelength converting member is disposed between the light guide plate and the light source array,
the light guide plate comprises:
a light entering surface through which light rays enter, the light rays including the primary light rays and the secondary light rays converted from the primary light rays emitted by the light sources and traveling through the at least one wavelength converting member from a light source side to a light guide plate side;
a light exiting surface through which the light rays exit;
an opposite surface disposed on an opposite side from the light exiting surface; and
a light reflecting and scattering pattern having light reflectivity and a light scattering property, the light reflecting and scattering pattern including a plurality of dots formed to be two-dimensionally dispersed on the opposite surface, some of the dots being complementary color dots disposed along a light emitting direction of the light source on a light guide plate side of the non-wavelength converting portion and configured to absorb the primary light rays and exhibit a complementary color of a reference color exhibited by the primary light rays.

2. The lighting device according to claim 1 , wherein the light reflecting and scattering pattern is defined such that a density per unit area on the opposite surface gradually increases as a distance from the light entering surface increases.

3. The lighting device according to claim 1 , wherein
the wavelength converting portion of the at least one wavelength converting member includes the phosphors dispersed in a transparent resin,
the holding portion of the at least one wavelength converting member is a tube with closed ends, and
the non-wavelength converting portion of the at least one wavelength converting member is at least one of the closed ends of the tube.

4. The lighting device according to claim 1 , wherein
the non-light converting portion that is the end of the at least one wavelength converting member is disposed closer to an adjacent end surface of the light guide plate adjacent to the light entering surface,
the complementary color dots are formed on the opposite surface along an adjacent end portion of the light guide plate including the adjacent end surface,
the at least one wavelength converting member includes wavelength converting members,
the wavelength converting members are disposed in line in a longitudinal direction in a space between the light source array and the light entering surface, and
the complementary color dots are formed on the opposite surface across the opposite surface along a light emitting direction of the light sources from a section in which the wavelength converting members are adjacent to each other.

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

6. A television device comprising the display device according to claim 5 .

7. A lighting device comprising:
a light source array comprising a plurality of light sources configured to emit primary light rays in a predefined wavelength range and arranged in line; and
at least one wavelength converting member disposed along a length direction of the light source array to be opposed to the light source array, the at least one wavelength converting member comprising:
a wavelength converting portion containing phosphors configured to secondary light rays in a wavelength range different from the wavelength range when excited by blue light rays;
a holding portion holding the wavelength converting portion to surround the wavelength converting portion and having light transmissivity and an elongated shape; and
a non-wavelength converting portion formed at an end of the holding portion with respect to a longitudinal direction of the holding portion and configured to pass the primary light rays emitted by the light sources; and

a light guide plate, wherein
the at least one wavelength converting member is disposed between the light guide plate and the light source array,
the light guide plate comprises:
a light entering surface through which light rays enter, the light rays including the primary light rays and the secondary light rays converted from the primary light rays emitted by the light sources and traveling through the at least one wavelength converting member from a light source side to a light guide plate side;
a light exiting surface through which the light rays exit; and
an opposite surface disposed on an opposite side from the light exiting surface, and. the lighting device further comprises:
a reflection member disposed to cover the opposite surface and configured to reflect light rays; and
a complementary color member configured to exhibit a complementary color of a reference color exhibited by the primary light rays and disposed between the opposite surface and the reflection member to overlap a section of the opposite surface extending from the non-wavelength converting portion in a light emitting direction of the light sources.

8. The lighting device according to claim 7 , wherein
the wavelength converting portion of the at least one wavelength converting member includes the phosphors dispersed in a transparent resin,
the holding portion of the at least one wavelength converting member is a tube with closed ends, and
the non-wavelength converting portion of the at least one wavelength converting member is at least one of the closed ends of the tube.

9. The lighting device according to claim 7 , wherein
the non-light converting portion that is the end of the at least one wavelength converting member is disposed closer to an adjacent end surface of the guide plate adjacent to the light entering surface, and
the complementary color member is disposed between the opposite surface and the reflection member along an adjacent end portion of the light guide plate including the adjacent end surface.

10. The lighting device according to claim 7 , wherein
the at least one wavelength converting member includes wavelength converting members,
the wavelength converting members are disposed in line in a longitudinal direction in a space between the light source array and the light entering surface, and
the complementary color member is disposed between the opposite surface and the reflection member across the opposite surface along a light emitting direction of the light sources from a section in which the wavelength converting members are adjacent to each other.

11. The lighting device according to claim 1 , wherein the phosphors contained in the wavelength converting portion are quantum dot ph

Assignees

• Sharp Kk

Inventors

• Uno Makoto
• Gotou Akira
• Matsui Keitaro
• Harada Masanobu

Classifications

• H10W90/00

  Package configurations · CPC title

• G02B6/0068

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

• F21S2/00

  Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction · CPC title

• G02B6/005

  provided by one optical element, or plurality thereof, placed on the light output side of the light guide · CPC title

• G02B6/0055

  Reflecting element, sheet or layer · CPC title