Light emitting device

• US 10,359,156 B2
• Filed: 08/23/2017
• Issued: 07/23/2019
• Est. Priority Date: 08/24/2016
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Sano, Masahiko
• Primary Examiner(s): Savusdiphol, Paultep
• Application Number:
  US15/684,178
• Publication Number:
  US 20180058644A1
• Time in Patent Office: 699 Days
• Field of Search: 362 84, 36224902, 36224906, 362260, 362290
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 9/30 Elements containing photoluminescent material distinct from or spaced from the light source shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01L 33/46 Reflective coating, e.g. dielectric Bragg reflector
• CPC Class Codes: H01L 33/50 Wavelength conversion elements

Abstract

A light emitting device includes a substrate, a plurality of LEDs arranged in rows and columns above the substrate, and a wavelength converting member above the plurality of LEDs. The wavelength converting member includes a plurality of fluorescent portions arranged in rows and columns and a lattice-shaped light shielding portion between the plurality of fluorescent portions. One or more row-direction spacing regions are located directly below a corresponding one of the rows of the fluorescent portions, and one or more column-direction spacing regions are located directly below a corresponding one of the columns of the fluorescent portions. One or more row-direction light-shielding regions of the light-shielding portion are respectively located directly above a corresponding one of the rows of the LEDs, and one or more column-direction light-shielding regions of the light-shielding portion are respectively located directly above a corresponding one of the columns of the LEDs.

Claims

1. A light emitting device comprising:

a substrate;

a plurality of LEDs arranged in rows and columns above the substrate;

a wavelength converting member above the plurality of LEDs, the wavelength converting member comprising;

a plurality of fluorescent portions arranged in rows and columns, and

a lattice-shaped light shielding portion between the plurality of fluorescent portions;

wherein, when viewed from above the plurality of LEDs;

row-direction spacing regions are respectively located between adjacent two of the rows of LEDs, wherein a width of each of the row-direction spacing regions in a column direction is smaller than a width of each of the plurality of the LEDs in the column direction, and

column-direction spacing regions are respectively located between adjacent two of the columns of LEDs, wherein a width of each of the column-direction spacing regions in a row direction is smaller than a width of each of the plurality of LEDs in the row direction;

wherein the lattice-shaped light-shielding portion comprises;

row-direction light-shielding regions that, when viewed from above the wavelength converting member, are respectively located between adjacent two of the rows of fluorescent portions, wherein a width of each of the row-direction light-shielding regions in the column direction is smaller than a width of each of the plurality of the fluorescent portions in the column direction, and

column-direction light-shielding regions that, when viewed from above the wavelength converting member, are respectively located between adjacent two of the columns of fluorescent portions, wherein a width of each of the column-direction light-shielding regions in the row direction is smaller than a width of each of the plurality of the fluorescent portions in the row direction;

wherein one or more of the row-direction spacing regions are respectively located directly below a corresponding one of the rows of the fluorescent portions;

wherein one or more of the column-direction spacing regions are respectively located directly below a corresponding one of the columns of the fluorescent portions;

wherein one or more of the row-direction light-shielding regions are respectively located directly above a corresponding one of the rows of the LEDs; and

wherein one or more of the column-direction light-shielding regions are respectively located directly above a corresponding one of the columns of the LEDs.

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

each of the row-direction spacing regions is located directly below a corresponding one of the rows of the fluorescent portions;

each of the column-direction spacing regions is located directly below a corresponding one of the columns of the fluorescent portions;

each of the row-direction light-shielding regions is located directly above a corresponding one of the rows of the LEDs; and

each of the column-direction light-shielding regions is located directly above a corresponding one of the columns of the LEDs.

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

each of the row-direction spacing regions is located directly below a corresponding one of the rows of the fluorescent portions;

each of the column-direction spacing regions is located directly below a corresponding one of the columns of the fluorescent portions;

two or more of the row-direction light-shielding regions are located directly above each of the rows of the LEDs; and

two or more of the column-direction light-shielding regions are located directly above each of the columns of the LEDs.

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

each of the plurality of LEDs is configured to be operated individually.

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

when viewed from above the plurality of LEDs, a part of the light-shielding portion surrounds an outer periphery of the plurality of LEDs.

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

a distance between two of the plurality of LEDs that are adjacent to each other in the row direction is 50 μ

m or less; and

a distance between two of the plurality of LEDs that are adjacent to each other in the column direction is 50 μ

m or less.

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

each of the plurality of LEDs has a width of 200 μ

m or less in the row direction, and has a width of 200 μ

m or less in the column direction.

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

a distance between two of the plurality of fluorescent portions that are adjacent to each other in the row direction is 50 μ

m or less; and

a distance between two of the plurality of fluorescent portions that are adjacent to each other in the column direction is 50 μ

m or less.

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

each of the plurality of fluorescent portions has a width of 200 μ

m or less in the row direction, and has a width of 200 μ

m or less in the column direction.

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

each of the plurality of LEDs has a substantially rectangular peripheral shape in a top view.

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

each of the plurality of fluorescent portions has a substantially rectangular peripheral shape in a top view.

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

the plurality of LEDs and the plurality of fluorescent portions are substantially the same size.

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

the plurality of LEDs are located on a single growth substrate.

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

the light shielding portion is made of a material adapted to shield 60% or more of light from the plurality of LEDs.

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

the light shielding portion comprises (i) a metal film that includes a single layer or a plurality of layers and/or (ii) a multilayer film in which two or more dielectric materials are layered.

16. The light emitting device according to claim 15, wherein:

the light shielding portion comprises a dielectric multilayer film and a metal film arranged in order from a fluorescent portion side.

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

each of the row-direction light shielding regions extends directly above a center of each of LEDs of a respective row of LEDs; and

each of the column-direction light shielding regions extends directly above a center of each of LEDs of a respective column of LEDs.

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

each of the row-direction spacing regions extends directly under a center of each of fluorescent portions of a respective row of fluorescent portions; and

each of the column-direction spacing regions extends directly under a center of each of fluorescent portions of a respective column of fluorescent portions.

19. The light emitting device according to claim 1, wherein

a width of each of the plurality of LEDs in the column direction is in a range of 3 times to 150 times a width of each of the row-direction light shielding regions in the column direction;

and

a width of each of the plurality of LEDs in the row direction is in a range of 3 times to 150 times a width of each of the column-direction light shielding regions in the row direction.

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

a width of each of the plurality of fluorescent portions in the column direction is in a range of 3 times to 150 times a width of each of the row-direction spacing regions in the column direction; and

a width of each of the plurality of fluorescent portions in the row direction is in a range of 3 times to 150 times a width of each of the column-direction spacing regions in the row direction.