LIGHT EMITTING DEVICE

• US 20160240518A1
• Filed: 02/12/2016
• Published: 08/18/2016
• Est. Priority Date: 02/13/2015
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: HAYASHI, Masaki, SHIOTA, Yuki, NARITA, Junya, KURASHITA, Keisuke, AKAISHI, Takanori
• Granted Patent: US 10,720,412 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01L 2224/32245 the item being metallic
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48137 the bodies being arranged next to each other, e.g. on a common substrate
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 25/167 comprising optoelectronic devices, e.g. LED, photodiodes
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/10156 at the periphery
• CPC Class Codes: H01L 33/18 within the light emitting region
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/486 adapted for surface mounting

Abstract

Each of a plurality of light emitting elements has a polygonal shape with five or more corners. An interior angle at each of the corners is less than 180°. The plurality of light emitting elements include a first light emitting element having a first bottom surface, a first top surface opposite to the first bottom surface, and a first lateral side surface between the first bottom surface and the first top surface. The second light emitting element has a second bottom surface, a second top surface opposite to the second bottom surface, and a second lateral side surface between the second bottom surface and the second top surface. The second lateral side surface is provided not to oppose to the first lateral side surface in substantially parallel.

Claims

1. A light emitting device comprising:

a package having an upper surface and a direction substantially perpendicular to the upper surface; and

a plurality of light emitting elements disposed on the upper surface, each of the plurality of light emitting elements having a polygonal shape with five or more corners viewed in the direction, an interior angle at each of the corners being less than 180°

, the plurality of light emitting elements comprising;

a first light emitting element having a first bottom surface, a first top surface opposite to the first bottom surface in the direction, and a first lateral side surface between the first bottom surface and the first top surface, the first light emitting element being disposed on the upper surface of the package at the first bottom surface; and

a second light emitting element having a second bottom surface, a second top surface opposite to the second bottom surface in the direction, and a second lateral side surface between the second bottom surface and the second top surface, the second light emitting element being disposed on the upper surface of the package at the second bottom surface, the second lateral side surface being provided not to oppose to the first lateral side surface in substantially parallel.

2. The light emitting device according to claim 1, wherein the polygon has eight or less corners.

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

the polygon is a hexagon,

the plurality of light emitting elements are disposed in a plurality of rows viewed in the direction, and

the light emitting elements disposed in an even row are rotated by 90°

about an axis perpendicular to the upper surface of the package relative to the light emitting elements arranged in an odd row.

12. The light emitting device according to claim 1, wherein, each of the light emitting elements includes a pair of electrodes for connecting to an outside, one electrode of the pair being disposed near one end of a longest diagonal line viewed in the direction, and other electrode of the pair being disposed near other end of the longest diagonal line viewed in the direction.

13. The light emitting device according to claim 1, wherein the light emitting elements are bonded to the package using silicone-base die bonding resin.

14. The light emitting device according to claim 13, further comprising a sealing resin sealing the light emitting elements, wherein an index of refraction of the die bonding resin is equal to or smaller than an index of refraction of the sealing resin.

4. A light emitting device comprising:

a package having a recess with a bottom surface and a direction substantially perpendicular to the bottom surface; and

a plurality of light emitting elements disposed on the bottom surface, each of the plurality of light emitting elements having a polygonal shape with five or more corners viewed in the direction, an interior angle at each of the corners being less than 180°

.

5. The light emitting device according to claim 4, wherein

the polygon is a hexagon, and

out of three pairs of the interior angles opposing to each other diagonally, two pairs of the interior angles have an identical angle equal to or greater than 135°

, and one pair of the interior angles have an identical angle equal to or smaller than 90°

.

6. The light emitting device according to claim 4, wherein

the plurality of light emitting elements are disposed in a staggered arrangement in a plurality of rows viewed in the direction, and

the light emitting elements disposed in an even row are rotated by 90°

about an axis perpendicular to the plane relative to the light emitting elements disposed in an odd row.

7. The light emitting device according to claim 6, wherein, in the hexagon, the one pair of the interior angles are each 90°

, and the two pairs of interior angles are each 135°

.

8. The light emitting device according to claim 7, wherein

in the hexagon, four sides forming the one pair of interior angles are shorter than other two sides, and

the plurality of light emitting elements are disposed such that, between adjacent ones out of the plurality of light emitting elements, their respective side surfaces being the other two sides do not oppose to each other in parallel.

9. The light emitting device according to claim 4, wherein

the plurality of light emitting elements are disposed such that, between adjacent ones out of the plurality of light emitting elements, their respective side surfaces oppose to each other substantially in parallel.

10. The light emitting device according to claim 9, wherein

the light emitting elements are at least four in number, and

the four light emitting elements out of the plurality of light emitting elements are disposed so as to form an approximately quadrangular gap at a center viewed in the direction.

11. The light emitting device according to claim 9, wherein

the light emitting element are at least four in number, and

four light emitting elements out of the plurality of light emitting elements are disposed in a cross shape viewed in the direction with a gap from each other.

15. A light emitting device comprising:

a package having an upper surface and a direction substantially perpendicular to the upper surface; and

a plurality of light emitting elements disposed on the upper surface, each of the plurality of light emitting elements having a polygonal shape with five or more corners viewed in the direction, an interior angle at each of the corners being less than 180°

, the plurality of light emitting elements comprising;

a first light emitting element and a second light emitting element which are provided such that one corner of the first light emitting element is closest to the second light emitting element.