SEMICONDUCTOR LIGHT EMITTING APPARATUS AND METHOD OF MANUFACTURING SAME

• US 20170130909A1
• Filed: 06/14/2016
• Published: 05/11/2017
• Est. Priority Date: 11/05/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: YEON, Ji Hye, Seong, Han Kyu, Kim, Yong Il, Kim, Jung Sub
• Granted Patent: US 10,008,640 B2
• Time in Patent Office: Days
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21V 23/003 the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2113/00 Combination of light sources
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

A light emitting apparatus includes at least one first light source and at least one second light source. The at least one first light source and at least one second light source may be configured to emit white light and cyan light, respectively, such that a ratio of luminous flux of the white light to luminous flux of the cyan light ranges from 19:1 to 370:1, based on a common magnitude of electrical current being applied to each of the at least one first light source and the at least one second light source.

Claims

1. A light emitting apparatus comprising:

at least one first light source configured to emit white light, the at least one first light source including,

at least one light emitting diode (LED) chip configured to emit light having a peak wavelength in a wavelength region of about 440 nm to about 460 nm, and

at least one phosphor configured to be excited by light emitted by the at least one LED chip, such that the at least one phosphor emits light having a peak wavelength in a wavelength region of about 490 nm to about 580 nm or a wavelength region of about 580 nm to about 630 nm; and

at least one second light source configured to emit cyan light having a peak wavelength in a wavelength region of about 460 nm to about 490 nm,

wherein the light emitting apparatus is configured to apply a common magnitude of electrical power to each of the at least one first light source and the at least one second light source such that a ratio of luminous flux of the white light emitted by the at least one first light source to luminous flux of the cyan light emitted by the at least one second light source ranges from about 19;

1 to about 370;

1.

2. The light emitting apparatus of claim 1, wherein a quantity of the at least one second light source is from about 1% to about 16% of a total quantity of the at least one first light source and the at least one second light source.

3. The light emitting apparatus of claim 2, further comprising:

an array of at least one first light source and at least one second light source, the array including a pattern of the at least one second light source.

4. The light emitting apparatus of claim 1, further comprising:

a driving controller configured to control a supply of electrical power to each of the at least one first light source and the at least one second light source,

the driving controller being configured to apply a first electrical current to the at least one first light source, the first electrical current having a first magnitude, and

the driving controller being configured to apply a second electrical current to the at least one second light source, the second electrical current having a second magnitude, the second magnitude being different from the first magnitude.

5. The light emitting apparatus of claim 4, wherein the driving controller is configured to transmit at least one of color rendering index (CRI) data associated with the light emitting apparatus and correlated color temperature (CCT) data associated with the light emitting apparatus to at least one device external to the light emitting apparatus.

6. The light emitting apparatus of claim 4, wherein

the driving controller is configured to process data generated by at least one of an illumination sensor, a motion sensor, and an image sensor, and

the driving controller is configured to transmit the processed data to at least one device external to the light emitting apparatus.

7. The light emitting apparatus of claim 1, wherein the at least one first light source further includes a reflective layer on a side of the at least one LED chip.

8. The light emitting apparatus of claim 1, wherein the at least one second light source includes a transparent resin layer, the transparent resin layer being independent of wavelength conversion material, the transparent resin layer including a stacked transparent film, the stacked transparent film is configured to widen a viewing angle of the at least one second light source, such that the viewing angle of the at least one second light source is equal to or greater than a viewing angle of the at least one first light source.

9. The light emitting apparatus of claim 8, wherein

the at least one first light source includes an active layer, the active layer including a first concentration of indium (In);

and

the at least one second light source includes a nitride semiconductor layer, the nitride semiconductor layer including a second concentration of indium (In), the second concentration of In being greater than the first concentration of In.

10. The light emitting apparatus of claim 1, further comprising:

a substrate, wherein the at least one first light source and the at least one second light source are each mounted on the substrate such that the light emitting apparatus has a flip-chip structure of light sources.

11. The light emitting apparatus of claim 1, wherein,

the at least one first light source and the at least one second light source are configured to emit mixed light, a light emission spectrum of mixed light emitted by the at least one first light source and the at least one second light source including at least three light emission peak wavelengths, the at least three light emission peak wavelengths include a first light emission peak wavelength and a second light emission peak wavelength, and

a ratio of intensity of the first light emission peak wavelength to intensity of the second light emission peak wavelength ranges from 0.3 to 1.5 at a shortest wavelength.

12. The light emitting apparatus of claim 11, wherein the at least one first light source and the at least one second light source are configured to emit mixed light having a CRI from about 80 to about 99.

13. The light emitting apparatus of claim 1, wherein the light emitting apparatus is configured to control a supply of electrical power to the at least one first light source and the at least one second light source, such that a correlated color temperature (CCT) of mixed light emitted by the at least one first light source and the at least one second light source is from about 2,000K to about 8,000K.

14. A light emitting apparatus comprising:

at least one first light source configured to emit white light;

at least one second light source configured to emit cyan light; and

a driving control chip configured to control a separate supply of electrical power to each of the at least one first light source and the at least one second light source, such that a common magnitude of electrical current is applied to each of the at least one first light source and the at least one second light source, and a ratio of luminous flux of the white light to luminous flux of the cyan light ranges from about 19;

1 to about 370;

1 at an identically applied current.

15. The light emitting apparatus of claim 14, wherein

the driving control chip is configured to process data provided by at least one of an illumination sensor, a motion sensor, and an image sensor, and

the driving control chip is configured to transmit the processed data to a device external to the light emitting apparatus.

16-20. -20. (canceled)

21. An apparatus, comprising:

a substrate; and

an array of light sources on the substrate, the array including a pattern of at least one first light source and at least one second light source, the at least one first light source being configured to emit white light and the at least one second light source being configured to emit cyan light;

the array of light sources being configured to emit white light and cyan light, based on a common magnitude of electrical power being received at both the at least one first light source and the at least one second light source, such that a ratio of luminous flux of the white light emitted by the at least one first light source to luminous flux of the cyan light emitted by the at least one second light source ranges from about 19;

1 to about 370;

1.

22. The apparatus of claim 21, further comprising:

a drive control chip electrically coupled to the array of light sources, the drive control chip being configured to independently control a separate supply of electrical power to each of the at least one first light source and the at least one second light source.

23. The apparatus of claim 22, wherein the drive control chip is configured to control the separate supplies of electrical power to the at least one first light source and the at least one second light source, such that different magnitudes of electrical current are applied to the at least one first light source and the at least one second light source, respectively.

24. The apparatus of claim 21, further comprising:

a dam on the substrate, the dam protruding from the substrate, the dam surrounding the array of light sources such that the dam defines an internal space in which the array of light sources is included.

25. The apparatus of claim 21, wherein,

the at least one first light source includes,

at least one light emitting diode (LED) chip configured to emit light having a peak wavelength in a wavelength region of about 440 nm to about 460 nm, and

at least one phosphor configured to be excited by light emitted by the at least one LED chip, such that the at least one phosphor emits light having a peak wavelength in a wavelength region of about 490 nm to about 580 nm or a wavelength region of about 580 nm to about 630 nm;

and the at least one second light source is configured to emit cyan light having a peak wavelength in a wavelength region of about 460 nm to about 490 nm.