LIGHT EMITTING DEVICE

• US 20190309912A1
• Filed: 06/25/2019
• Published: 10/10/2019
• Est. Priority Date: 08/24/2016
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: SANO, Masahiko
• Granted Patent: US 10,746,356 B2
• Time in Patent Office: Days
• 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 plurality of LEDs arranged in rows and columns; and 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 light shielding portion between the plurality of fluorescent portions; wherein, in a top view, a first fluorescent portion among the plurality of fluorescent portions overlaps first and second adjacent LEDs among the plurality of LEDs.

Claims

1. A light emitting device comprising:

a plurality of LEDs arranged in rows and columns; and

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 light shielding portion between the plurality of fluorescent portions;

wherein, in a top view, a first fluorescent portion among the plurality of fluorescent portions overlaps first and second adjacent LEDs among the plurality of LEDs.

2. The light emitting device according to claim 1, wherein, in the top view, a center of the first LED overlaps the light shielding portion.

3. The light emitting device according to claim 2, wherein, in the top view, a center of the second LED overlaps the light shielding portion.

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

a plurality of light shielding layers, each covering a lateral surface of a respective one of the plurality of LEDs.

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

a wiring structure configured such that the plurality of LEDs are individually controllable using a passive matrix configuration.

6. The light emitting device according to claim 5, further comprising:

a substrate comprising the wiring structure.

7. 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.

8. The light emitting device according to claim 1, wherein the light shielding portion is lattice-shaped.

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

the first and second LEDs are adjacent to each other in a row direction;

a third LED among the plurality of LEDs is adjacent to the first LED in a column direction;

a distance between the first LED and the second LED is 50 μ

m or less; and

a distance between the first LED and the third LED is 50 μ

m or less.

10. 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 a row direction, and has a width of 200 μ

m or less in a column direction.

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

a second fluorescent portion among the plurality of fluorescent portions is adjacent to the first fluorescent portion in a row direction;

a third fluorescent portion among the plurality of fluorescent portions is adjacent to the first fluorescent portion in a column direction;

a distance between the first fluorescent portion and the second fluorescent portion is 50 μ

m or less; and

a distance between the first fluorescent portion and the third fluorescent portion is 50 μ

m or less.

12. 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.