# US 9,520,384 B2 · Light-emitting device

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- Number: US 9,520,384 B2
- Document ID: US9520384B2
- Status: Granted
- Kind: B2
- Application number: 15/136,531
- Filed: 2016-04-22
- Published: 2016-08-18
- Granted: 2016-12-13
- Earliest claimed: 2014-04-07
- Assignees: Epistar Corporation
- Applicants: Epistar Corporation
- Inventors: Chien-Liang Liu; Ming-Chi Hsu
- Web page: https://patentgrep.com/patent/US9520384B2

## CPC

- H10W 90/00: Package configurations
- H10H 20/851: Wavelength conversion means
- H10H 20/036: {of packages}
- H10H 20/0361: {of wavelength conversion means}
- H10W 72/20: Bump connectors, e.g. solder bumps or copper pillars; Dummy bumps; Thermal bumps
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

A light-emitting device, having an overall color temperature when emitting light, includes a carrier, a first LED unit, and a second LED unit. The carrier has a circuit. The first LED unit is arranged on the carrier and has a first color temperature. The second LED unit is spaced apart from the first LED unit by a space, and electrically connected to first LED unit and the circuit. The first LED unit and the second LED unit, and each includes a light-emitting body and a wavelength conversion layer covering the light-emitting body. The first color temperature is different from the overall color temperature.

## Claims

### Claim 1

A light-emitting device, having an overall color temperature when emitting light, comprising:
a carrier comprising a circuit;
a first LED unit arranged on the carrier and having a first color temperature when emitting light; and
a second LED unit spaced apart from the first LED unit by a space, and electrically connected to first LED unit and the circuit,
wherein the first LED unit and the second LED unit, each comprises a light-emitting body and a wavelength conversion layer covering the light-emitting body,
wherein the first color temperature is different from the overall color temperature.

### Claim 2 (depends on 1)

The light-emitting device of claim 1, wherein the space is ranged from 0.15 mm to 8 mm.

### Claim 3 (depends on 1)

The light-emitting device of claim 1, wherein the space is not greater than 2 mm.

### Claim 4 (depends on 3)

The light-emitting device of claim 3, wherein the overall color temperature and the first color temperature have a difference of not less than 160 K, provided the overall color temperature is ranged from 5700 K to 6500 K.

### Claim 5 (depends on 3)

The light-emitting device of claim 3, wherein the overall color temperature and the first color temperature have a difference of not less than 5 K, provided the overall color temperature is ranged from 2700K to 3000K.

### Claim 6 (depends on 1)

The light-emitting device of claim 1, wherein the overall color temperature is higher than the first color temperature.

### Claim 7 (depends on 1)

The light-emitting device of claim 1, wherein the light-emitting device has a flux of radiation which is increased with increase of the space.

### Claim 8 (depends on 1)

The light-emitting device of claim 1, wherein the light-emitting device has a luminous flux variation of about 0.2%˜3.0%.

### Claim 9 (depends on 1)

The light-emitting device of claim 1, wherein the overall color temperature has a change of about 25K˜340K in response to a variation of the space.

### Claim 10 (depends on 1)

The light-emitting device of claim 1, wherein the first LED unit can emit a light towards the second LED unit.

### Claim 11 (depends on 1)

The light-emitting device of claim 1, wherein the wavelength conversion layer of the first LED unit or the second LED unit has a width substantially equal to the space.

### Claim 12 (depends on 1)

The light-emitting device of claim 1, wherein the first LED unit and the second LED unit, each further comprises a first transparent structure covering the light-emitting body.

### Claim 13 (depends on 1)

The light-emitting device of claim 1, wherein the first LED unit and the second LED unit, each further comprises a conductive portion arranged between the light-emitting body and the carrier.

### Claim 14 (depends on 13)

The light-emitting device of claim 13, wherein the LED unit and the second LED unit, each further comprises a reflective layer arranged on the light-emitting body and surrounding the conductive portion.

### Claim 15 (depends on 1)

The light-emitting device of claim 1, wherein the first LED unit and the second LED unit are electrically connected to each other in series.

### Claim 16 (depends on 1)

The light-emitting device of claim 1, wherein the first LED unit and the second LED unit are electrically connected to each other in parallel.