Light-emitting module and lighting apparatus provided with same

• US 10,136,499 B2
• Filed: 02/01/2016
• Issued: 11/20/2018
• Est. Priority Date: 02/02/2015
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Kim, Do Yub, Son, Eon Ho, Shin, Mi Na, Ahn, Young Joo, Lee, Kwang Jae
• Primary Examiner(s): Le, Don
• Application Number:
  US15/547,952
• Publication Number:
  US 20180249549A1
• Time in Patent Office: 1,023 Days
• Field of Search: 315185 R
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21S 10/02 changing colors F21S10/002 - F21S10/007, F21S10/04 take precedence
• CPC Class Codes: F21V 13/02 Combinations of only two kinds of elements
• CPC Class Codes: F21V 29/80 with pins or wires
• 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: H05B 45/14 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: H05B 45/24 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: H05B 45/40 Details of LED load circuits

Abstract

A lighting apparatus disclosed in an embodiment comprises: a circuit board; a light-emitting module arranged on the circuit board and comprising a light source part having first to third light source parts emitting red, green and blue light; a control unit for providing current control signals to the first to third light source parts; a driver for controlling the current in the first to third light source parts by means of the control unit; and a memory unit having compensation data storing input current strength values for the first to third light source parts so that same emit white light having a previously configured correlated color temperature (CCT). The first, second and third light source parts comprise a plurality of first, second and third light-emitting elements for emitting red, green and blue light. The control unit controls the current in the first to third light source parts by means of the input current strength value corresponding to the compensation data so as to control the white light discharged from the light-emitting module is emitted as white light meeting the CCT criterion.

Claims

1. A lighting apparatus comprising:

a light-emitting module comprising a circuit board and a light source part disposed on the circuit board and comprising first to third light source parts emitting red, green and blue light;

a control unit providing first to third current control signals to control current of each of the first to third light source parts;

a driver adjusting the current of the first to third light source parts through the first to third current control signals of the control unit; and

a memory unit having compensation data in which input current strength values for the first to third light source parts are stored so that white light having a preset correlated color temperature (CCT) is emitted from the first to third light source parts,

wherein the first light source part comprises a plurality of first light emitting devices emitting red light,

the second light source part comprises a plurality of second light emitting devices emitting green light,

the third light source part comprises a plurality of third light emitting devices emitting blue light, and

the control unit controls the current of the first to third light source parts through the input current strength values corresponding to the compensation data to control the light-emitting module so that the white light emitted from the light-emitting module is emitted as white light that becomes a reference for each CCT,

wherein the circuit board comprises a first wiring portion disposed under the plurality of first light emitting devices, a second wiring portion disposed under the plurality of second light emitting devices, and a third wiring portion disposed under the plurality of third light emitting devices, and

wherein the first wiring portion comprises a plurality of wirings, and each of the plurality of wirings has a top surface area greater than that of each of wirings of the second and third wiring portions.

2. The lighting apparatus according to claim 1, wherein the memory unit comprises a look up table in which the input current strength values for compensating the white light emitted from the first to third light source parts to white light that becomes the reference for each preset CCT according to a temperature change.

3. The lighting apparatus according to claim 2, wherein the light-emitting module comprises a heat detection device disposed outside the first light emitting device, and

the control unit transmits the first to third current control signals to the driver through the input current strength values of the look up table according to a temperature transmitted from the heat detection device.

4. The lighting apparatus according to claim 1, wherein the first to third light emitting devices are disposed on the circuit board,

the plurality of first light emitting devices are disposed around an outside of the second and third light emitting devices,

the plurality of second light emitting devices are disposed on both sides of the plurality of third light emitting devices,

the plurality of first light emitting devices are connected to each other in series,

the plurality of second light emitting devices are connected to each other in series,

the plurality of third light emitting devices are connected to each other in series, and

a number of first to third light emitting devices are different from each other.

5. The lighting apparatus according to claim 1, wherein a number of each of the first to third light emitting devices increases as a wavelength of the emitted light increases.

6. The lighting apparatus according to claim 1, further comprising a reflection member disposed around each of the light source parts on the circuit board, and

wherein the plurality of first light emitting devices are disposed more adjacent to the reflection member than the second and third light emitting devices.

7. The lighting apparatus according to claim 1, wherein a number of plurality of first light emitting devices is greater than that of plurality of second light emitting devices, and

a number of plurality of second light emitting devices is greater than that of plurality of third light emitting devices.

8. The lighting apparatus according to claim 1, wherein a number of second light emitting devices corresponds to 200% of a number of third light emitting devices, and

a number of first light emitting devices corresponds to 125% of the number of second light emitting devices.

9. The lighting apparatus according to claim 1, wherein the plurality of second light emitting devices are disposed inside a virtual circle passing through the plurality of first light emitting devices by using an area between the plurality of third light emitting devices as a center, and

the plurality of third light emitting devices are disposed inside a virtual circle passing through the plurality of second light emitting devices by using the area between the plurality of third light emitting devices as a center.

10. The lighting apparatus according to claim 7, wherein output-sides of the plurality of first light emitting devices are connected to input-sides of the plurality of second light emitting devices, and

output-sides of the plurality of second light emitting devices are connected to input-sides of the plurality of third light emitting devices.

11. The lighting apparatus according to claim 6, wherein a plurality of holes to which a lower portion of the reflection member is coupled are defined in the circuit board, and

the plurality of holes are defined outside a virtual circle passing through the plurality of first light emitting devices.

12. The lighting apparatus according to claim 11, further comprising a light transmissive member in the reflection member,

wherein the reflection member has a lower diameter greater than an upper diameter thereof, and

the reflection member has a height greater than the lower diameter.

13. A lighting apparatus comprising:

a light-emitting module comprising a circuit board and a light source part disposed on the circuit board and comprising first to third light source parts emitting red, green and blue light;

a control unit providing first to third current control signals to control current of each of the first to third light source parts;

a driver adjusting the current of the first to third light source parts through the first to third current control signals of the control unit;

a memory unit having compensation data in which input current strength values for the first to third light source parts are stored so that white light having a preset correlated color temperature (CCT) is emitted from the first to third light source parts;

a reflection member disposed around each of the light source parts on the circuit board, and

wherein the plurality of first light emitting devices are disposed more adjacent to the reflection member than the second and third light emitting devices;

wherein a plurality of holes to which a lower portion of the reflection member is coupled are defined in the circuit board, and

the plurality of holes are defined outside a virtual circle passing through the plurality of first light emitting devices

wherein the first light source part comprises a plurality of first light emitting devices emitting red light,

the second light source part comprises a plurality of second light emitting devices emitting green light,

the third light source part comprises a plurality of third light emitting devices emitting blue light, and

the control unit controls the current of the first to third light source parts through the input current strength values corresponding to the compensation data to control the light-emitting module so that the white light emitted from the light-emitting module is emitted as white light that becomes a reference for each CCT,

further comprising a plurality of support protrusions disposed in the reflection member and protruded from the first wiring portion.

14. The lighting apparatus according to claim 13, wherein the circuit board comprises a first wiring portion disposed under the plurality of first light emitting devices, a second wiring portion disposed under the plurality of second light emitting devices, and a third wiring portion disposed under the plurality of third light emitting devices, and

the first wiring portion comprises a plurality of wirings, and each of the plurality of wirings has a top surface area greater than that of each of wirings of the second and third wiring portions,

wherein each of the support protrusions is made of a metal material, and

at least one support protrusion protrudes from at least one wiring of the wirings of the first wiring portion.

15. The lighting apparatus according to claim 13, wherein the reflection member has a lower diameter greater than an upper diameter thereof, and the reflection member has a height greater than the lower diameter.

16. The lighting apparatus according to claim 13, wherein the memory unit comprises a look up table in which the input current strength values for compensating the white light emitted from the first to third light source parts to white light that becomes the reference for each preset CCT according to a temperature change.

17. The lighting apparatus according to claim 16, wherein the light-emitting module comprises a heat detection device disposed outside the first light emitting device, and

the control unit transmits the first to third current control signals to the driver through the input current strength values of the look up table according to a temperature transmitted from the heat detection device.

18. The lighting apparatus according to claim 13, wherein the first to third light emitting devices are disposed on the circuit board,

the plurality of first light emitting devices are disposed around an outside of the second and third light emitting devices,

the plurality of second light emitting devices are disposed on both sides of the plurality of third light emitting devices,

the plurality of first light emitting devices are connected to each other in series,

the plurality of second light emitting devices are connected to each other in series,

the plurality of third light emitting devices are connected to each other in series, and

a number of first to third light emitting devices are different from each other.

19. The lighting apparatus according to claim 13, wherein the plurality of second light emitting devices are disposed inside a virtual circle passing through the plurality of first light emitting devices by using an area between the plurality of third light emitting devices as a center, and

the plurality of third light emitting devices are disposed inside a virtual circle passing through the plurality of second light emitting devices by using the area between the plurality of third light emitting devices as a center.

20. The lighting apparatus according to claim 19, wherein output-sides of the plurality of first light emitting devices are connected to input-sides of the plurality of second light emitting devices, and

output-sides of the plurality of second light emitting devices are connected to input-sides of the plurality of third light emitting devices.