White-light LED modules

• US 9,803,837 B2
• Filed: 01/28/2015
• Issued: 10/31/2017
• Est. Priority Date: 12/31/2014
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Chen, Lingyan, Zhang, Yanxue
• Primary Examiner(s): Haupt, Kristy A
• Application Number:
  US14/438,220
• Publication Number:
  US 20160341403A1
• Time in Patent Office: 1,007 Days
• Field of Search: None
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21V 19/0025 the fastening means engaging the conductors of the light source, i.e. providing simultaneous fastening of the light sources and their electric connections
• CPC Class Codes: F21V 7/0016 on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
• CPC Class Codes: F21Y 2105/16 square or rectangular, e.g. for light panels
• CPC Class Codes: F21Y 2107/20 on convex supports or substrates, e.g. on the outer surface of spheres
• 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 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 47/00 Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant

Abstract

A white-light LED module is disclosed. The white-light LED module includes a substrate, and a red-light LED chip string, a blue-light LED chip string, and a green-light LED chip string arranged on the substrate. The red-light LED chip string, the blue-light LED chip string, and the green-light LED chip string are connected in parallel. A number of blue LED chips within the blue-light LED chip string equals to the number of green LED chips within the green-light LED chip string. The number of red LED chips within the red-light LED chip string is as double as the number of blue LED chips and the green LED chips. In this way, the light mixture performance of the red, green and blue LED chips may be enhanced.

Claims

1. A white-light LED module, comprising:

a substrate, and a red-light LED chip string, a blue-light LED chip string, and a green-light LED chip string arranged on the substrate, wherein the red-light LED chip string, the blue-light LED chip string, and the green-light LED chip string are connected in parallel, a number of blue LED chips within the blue-light LED chip string equals to the number of green LED chips within the green-light LED chip string, the number of red LED chips within the red-light LED chip string is as double as the number of blue LED chips and the green LED chips;

two pins, two ends of the red-light LED chip string, of the blue-light LED chip string, and of the green-light LED chip string respectively connect to one corresponding pin;

at least one reflective wall surrounding the red-light LED chip string, the blue-light LED chip string, and the green-light LED chip string, wherein the substrate comprises a curved surface such that at least a portion of light beams emitted from the red LED chips, the blue LED chip, and the green LED chip are reflected back by the reflective wall.

2. The white-light LED module as claimed in claim 1, wherein the red-light LED chip string comprises two red LED chips, the blue-light LED chip string comprises one blue LED chip, and the green-light LED chip string comprises one green LED chip, the two red LED chips are serially connected, and the serially connected red LED chips further connect with the blue LED chip and the green LED chip in parallel.

3. The white-light LED module as claimed in claim 2, wherein the substrate is circular-shaped, the circle is divided into four sectors, and the two red LED chips, the blue LED chip, and the green LED chip are respectively arranged corresponding to one sector.

4. The white-light LED module as claimed in claim 3, wherein the red LED chips are respectively arranged in two sectors that are not adjacent to each other.

5. The LED module as claimed in claim 3, wherein angles respectively formed by connecting lines between the red LED chips, the blue LED chip, the green LED chip and a center are substantially the same.

6. The white-light LED module as claimed in claim 1, wherein the substrate protrudes from edges of the substrate toward a center of the substrate along a light-emitting direction of the white-light LED module.

7. The white-light LED module as claimed in claim 1, wherein an internal surface of the reflective wall is arranged with a convex-concave reflective structure.

8. The white-light LED module as claimed in claim 1, wherein the red LED chips operate when the voltage is within a range of 1.8 and 2.6V, and the blue LED chips and the green LED chips operate when the voltage is within a range of 2.8 and 3.6V.

9. A white-light LED module, comprising:

a substrate, and a red-light LED chip string, a blue-light LED chip string, and a green-light LED chip string arranged on the substrate, wherein the red-light LED chip string, the blue-light LED chip string, and the green-light LED chip string are connected in parallel, a number of blue LED chips within the blue-light LED chip string equals to the number of green LED chips within the green-light LED chip string, the number of red LED chips within the red-light LED chip string is as double as the number of blue LED chips and the green LED chips.

10. The white-light LED module as claimed in claim 9, wherein the module further comprises two pins, two ends of the red-light LED chip string, of the blue-light LED chip string, and of the green-light LED chip string respectively connect to one corresponding pin.

11. The white-light LED module as claimed in claim 9, wherein the red-light LED chip string comprises two red LED chips, the blue-light LED chip string comprises one blue LED chip, and the green-light LED chip string comprises one green LED chip, the two red LED chips are serially connected, and the serially connected red LED chips further connect with the blue LED chip and the green LED chip in parallel.

12. The white-light LED module as claimed in claim 11, wherein the substrate is circular-shaped, the circle is divided into four sectors, and the two red LED chips, the blue LED chip, and the green LED chip are respectively arranged corresponding to one sector.

13. The white-light LED module as claimed in claim 12, wherein the red LED chips are respectively arranged in two sectors that are not adjacent to each other.

14. The white-light LED module as claimed in claim 12, wherein angles respectively formed by connecting lines between the red LED chips, the blue LED chip, the green LED chip and a center are substantially the same.

15. The white-light LED module as claimed in claim 9, wherein the white-light LED module further comprises at least one reflective wall surrounding the red-light LED chip string, the blue-light LED chip string, and the green-light LED chip string, wherein the substrate comprises a curved surface such that at least a portion of light beams emitted from the red LED chips, the blue LED chip, and the green LED chip are reflected back by the reflective wall.

16. The white-light LED module as claimed in claim 15, wherein the substrate protrudes from edges of the substrate toward a center of the substrate along a light-emitting direction of the white-light LED module.

17. The white-light LED module as claimed in claim 15, wherein an internal surface of the reflective wall is arranged with a convex-concave reflective structure.

18. The white-light LED module as claimed in claim 9, wherein the red LED chips operate when the voltage is within a range of 1.8 and 2.6V, and the blue LED chips and the green LED chips operate when the voltage is within a range of 2.8 and 3.6V.