Light-emitting device

• US 10,553,768 B2
• Filed: 04/10/2019
• Issued: 02/04/2020
• Est. Priority Date: 04/11/2018
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Sato, Yoshiki
• Primary Examiner(s): Hines, Anne M
• Application Number:
  US16/380,601
• Publication Number:
  US 20190319176A1
• Time in Patent Office: 300 Days
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0065 Manufacturing aspects; Material aspects
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/0091 of the light source relative to the light guide G02B6/0021 takes precedence
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2933/0033 relating to semiconductor body packages
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 2933/005 relating to encapsulations
• CPC Class Codes: H01L 2933/0058 relating to optical field-shaping elements
• CPC Class Codes: H01L 2933/0066 relating to arrangements for conducting electric current to or from the semiconductor body
• CPC Class Codes: H01L 33/38 with a particular shape
• CPC Class Codes: H01L 33/46 Reflective coating, e.g. dielectric Bragg reflector
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

A light-emitting device includes: a light-emitting element which includes an upper surface and a first lateral surface; a light-transmitting member disposed above the light-emitting element, the light-transmitting member having a substantially rectangular shape with a pair of first sides and a pair of second sides; a wavelength conversion member having a plurality of lateral surfaces; and a reflecting member. The light-transmitting member has a pair of second lateral surfaces each including a corresponding one of the first sides, and a pair of third lateral surfaces each including a corresponding one of the second sides. The reflecting member covers the first lateral surface, an entirety of the plurality of lateral surfaces of the wavelength conversion member, and an entirety of the pair of second lateral surfaces of the light-transmitting member. Each of the pair of third lateral surfaces of the light-transmitting member is partially exposed out of the reflecting member.

Claims

1. A light-emitting device comprising:

a light-emitting element which includes an upper surface and a first lateral surface;

a light-transmitting member disposed above the upper surface of the light-emitting element, the light-transmitting member having a substantially rectangular shape with a pair of first sides substantially parallel to each other and a pair of second sides substantially parallel to each other and substantially perpendicular to the first sides in a top view;

a wavelength conversion member disposed between the light-emitting element and the light-transmitting member, the wavelength conversion member having a plurality of lateral surfaces; and

a reflecting member,

wherein the light-transmitting member has

a pair of second lateral surfaces each including a corresponding one of the first sides of the rectangular shape of the light-transmitting member, and

a pair of third lateral surfaces each including a corresponding one of the second sides of the rectangular shape of the light-transmitting member,

the reflecting member covers the first lateral surface of the light-emitting element, an entirety of the plurality of lateral surfaces of the wavelength conversion member, and an entirety of the pair of second lateral surfaces of the light-transmitting member, and

each of the pair of third lateral surfaces of the light-transmitting member is partially exposed out of the reflecting member.

2. The light-emitting device of claim 1, wherein the pair of third lateral surfaces of the light-transmitting member are entirely exposed out of the reflecting member.

3. The light-emitting device of claim 2, wherein the reflecting member has a reflecting surface opposing a portion of a third lateral surface of the light-transmitting member, said portion being exposed out of the reflecting member, the reflecting surface being inclined with respect to the third lateral surface of the light-transmitting member.

4. The light-emitting device of claim 1, wherein the reflecting member has a reflecting surface opposing a portion of a third lateral surface of the light-transmitting member, said portion being exposed out of the reflecting member, the reflecting surface being inclined with respect to the third lateral surface of the light-transmitting member.

5. The light-emitting device of claim 1, wherein

the light-transmitting member has a substantially oblong rectangular shape in a top view,

the first sides are longer sides of the oblong rectangular shape relative to the second sides, and

the second sides are shorter sides of the oblong rectangular shape relative to the first sides.

6. The light-emitting device of claim 1, wherein

the light-emitting device comprise a plurality of light-emitting elements that include a first light-emitting element and a second light-emitting element, and

the light-emitting device comprises a plurality of light-transmitting members that include a first light-transmitting member disposed above the first light-emitting element and a second light-transmitting member disposed above the second light-emitting element, wherein the first light-transmitting member and the second light-transmitting member are spaced away from each other in an extending direction of the first sides of the substantially rectangular shape of the light-transmitting member having a substantially rectangular shape.

7. The light-emitting device of claim 6, wherein the reflecting member includes a portion located between a third lateral surface of the first light-transmitting member and a third lateral surface of the second light-transmitting member.

8. The light-emitting device of claim 1, wherein

the light-emitting element includes a first electrode and a second electrode which are disposed on a side opposite to the upper surface, and

the light-emitting device further comprises a substrate, the substrate including a first conductive part connected with the first electrode of the light-emitting element and a second conductive part connected with the second electrode of the light-emitting element.

9. The light-emitting device of claim 1, further comprising a light guiding member, the light guiding member including a portion located between the first lateral surface of the light-emitting element and the reflecting member.

10. A backlight comprising:

the light-emitting device as set forth in claim 1; and

a light guide plate which has two principal surfaces and a light incident surface located between the principal surfaces, the light incident surface being optically coupled with the light-emitting device,

wherein a distance between a light emission surface of the light-transmitting member and the light incident surface of the light guide plate is in a range of 0 μ

m to 5 μ

m.

11. A light-emitting device comprising:

a light-emitting element which has an upper surface and a first lateral surface;

a light-transmitting member disposed above the upper surface of the light-emitting element, the light-transmitting member having a substantially rectangular shape with a pair of first sides substantially parallel to each other and a pair of second sides substantially parallel to each other and substantially perpendicular to the first sides in a top view;

a wavelength conversion member disposed between the light-emitting element and the light-transmitting member; and

a reflecting member,

wherein, the light-transmitting member includes;

a pair of second lateral surfaces each including a corresponding one of the first sides of the rectangular shape of the light-transmitting member, and

a pair of third lateral surfaces each including a corresponding one of the second sides of the rectangular shape of the light-transmitting member,

the wavelength conversion member includes;

a pair of fourth lateral surfaces which are parallel to the second lateral surfaces of the light-transmitting member, and

a pair of fifth lateral surfaces which are parallel to the third lateral surfaces of the light-transmitting member,

the reflecting member covers the first lateral surfaces of the light-emitting element and an entirety of the second lateral surfaces of the light-transmitting member, the third lateral surfaces of the light-transmitting member, the fourth lateral surfaces of the wavelength conversion member and the fifth lateral surfaces of the wavelength conversion member, and

the reflecting member includes a first portion covering the third lateral surfaces of the light-transmitting member, and a second portion covering the fifth lateral surfaces of the wavelength conversion member, the first portion having a thickness smaller than a thickness of the second portion, and the second portion has an upper surface located outward of the first portion.

12. The light-emitting device of claim 11, wherein the first portion of the reflecting member includes a portion having a thickness that gradually decreases in an upward direction of the light-emitting device.

13. The light-emitting device of claim 11, wherein

the light-transmitting member has a substantially oblong rectangular shape in a top view,

the first sides are longer sides of the oblong rectangular shape relative to the second sides, and

the second sides are shorter sides of the oblong rectangular shape relative to the first sides.

14. The light-emitting device of claim 11, wherein

the light-emitting device comprises a plurality of the light-emitting elements that include a first light-emitting element and a second light-emitting element, and

the light-emitting device comprises a plurality of the light-transmitting members that include a first light-transmitting member disposed above the first light-emitting element and a second light-transmitting member disposed above the second light-emitting element, wherein the first light-transmitting member and the second light-transmitting member are spaced away from each other in an extending direction of the first sides of the substantially rectangular shape of the light-transmitting member having a substantially rectangular shape.

15. The light-emitting device of claim 14, wherein the reflecting member includes a portion located between a third lateral surface of the first light-transmitting member and a third lateral surface of the second light-transmitting member.

16. The light-emitting device of claim 11, wherein

the light-emitting element includes a first electrode and a second electrode which are disposed on a side opposite to the upper surface, and

the light-emitting device further comprises a substrate, the substrate including a first conductive part connected with the first electrode of the light-emitting element and a second conductive part connected with the second electrode of the light-emitting element.

17. The light-emitting device of claim 11, further comprising a light guiding member, the light guiding member including a portion located between the first lateral surface of the light-emitting element and the reflecting member.

18. A backlight comprising:

the light-emitting device as set forth in claim 11; and

a light guide plate which has two principal surfaces and a light incident surface located between the principal surfaces, the light incident surface being optically coupled with the light-emitting device,

wherein a distance between a light emission surface of the light-transmitting member and the light incident surface of the light guide plate is in a range of 0 μ

m to 5 μ

m.