IP Library › Granted Patent US 10,720,552
Granted Patent B2
US 10,720,552 · App. 15/608,791 · Granted Jul 21, 2020

Light emitting device

Inventors: Yuichi Yamada (Anan, JP); Motokazu Yamada (Tokushima, JP)
Assignee: NICHIA CORPORATION
H01L33/44H01L33/38H01L33/46H01L33/508H01L33/54H01L33/62H01L33/20H01L33/26H01L33/405H01L33/60H01L2224/48091H01L2224/8592H01L2924/181H01L2933/0016
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Quick Facts
Patent No.
US 10,720,552
App. No.
15/608,791
Granted
Jul 21, 2020
Kind
B2
Abstract

A light emitting device includes: a substrate; a light emitting element disposed on the substrate, the light emitting element having an upper surface and a lateral surface; a reflecting layer located on the upper surface of the light emitting element; a first light-transmissive member having a first surface in contact with the lateral surface of the light emitting element, and a second surface that is inclined toward the substrate in a direction outward from the light emitting element; and a second light-transmissive member in contact with the second surface and covering the light emitting element. A refractive index of the first light-transmissive is smaller than a refractive index of the second light-transmissive member.

Claims (24)

1. A surface light emitting device comprising:

a substrate;

a plurality of light emitting devices disposed in a two-dimensional array on the substrate, each light emitting device comprising:

a light emitting element having an upper surface and a lateral surface,

a reflecting layer located on the upper surface of the light emitting element,

a first light-transmissive member having a first surface in contact with the lateral surface of the light emitting element, and a second surface that is inclined toward the substrate in a direction outward from the light emitting element, and

a second light-transmissive member in direct contact with the second surface of the first light-transmissive member and covering the light emitting element,

wherein a refractive index of the first light-transmissive is smaller than a refractive index of the second light-transmissive member; and

a plurality of reflecting members disposed on the substrate, the plurality of reflecting members including:

a first reflecting member extending in a first direction and arranged between a first of the light emitting devices and a second of the light emitting devices that are adjacent to each other in a second direction that is perpendicular to the first direction, and

a second reflecting member extending in the second direction and arranged between the first of the light emitting devices and a third of the light emitting devices that are adjacent to each other in the first direction,

wherein each reflecting member is configured to reflect light from the light emitting elements of the respective two adjacent light emitting devices, and each reflecting member is disposed in a region outward of the second light-transmissive members of the respective two adjacent light emitting devices.

2. The surface light emitting device according to claim 1 , wherein each first light-transmissive member and each second light-transmissive member is made of a resin material.

3. The surface light emitting device according to claim 1 , wherein each second light-transmissive member directly covers the substrate at a location outward of an outer periphery of each respective first light-transmissive member.

4. The surface light emitting device according to claim 1 , wherein a surface of each second light-transmissive member is curved.

5. The surface light emitting device according to claim 1 , wherein each second light-transmissive member has a circular shape in a top view, and a height of each second light-transmissive member is smaller than a radius of the circular shape.

6. The surface light emitting device according to claim 1 , wherein each light emitting element is flip-chip-mounted on the substrate.

7. The surface light emitting device according to claim 1 , wherein:

the substrate comprises a wiring part located at an upper side of the substrate, and

each light emitting element is electrically connected to the wiring part via a wire.

8. The surface light emitting device according to claim 1 , wherein a height of each reflecting member is greater than a height of each respective second light-transmissive member.

9. The surface light emitting device according to claim 1 , further comprising a light diffusing plate disposed over the light emitting devices and the reflecting members.

10. The surface light emitting device according to claim 1 , further comprising a wavelength converting layer disposed over the light emitting devices and the reflecting members.

11. The surface light emitting device according to claim 1 , wherein each of the one of more reflecting members comprises a first surface that extends downward and outward toward a first light emitting device of the respective two adjacent light emitting devices, and a second surface that extends downward and outward toward a second light emitting device of the respective two adjacent light emitting devices.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 15, 2017
From: YAMADA, YUICHI; YAMADA, MOTOKAZU
To: NICHIA CORPORATION
Reel/Frame 043300/0981 →
Priority Claims (1)
JP 2016-108389 · May 31, 2016 · national
Continuity (1)
Related Publication 20170345974A1 · Nov 30, 2017