Lighting apparatus

Patent metadata

Field	Value
Publication number	US-12442497-B2
Application number	US-202519069284-A
Country	US
Kind code	B2
Filing date	Mar 4, 2025
Priority date	Mar 4, 2024
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

A lighting device includes a flexible substrate, four types of LED modules, and a driver. The substrate has an elongated area divided into four bands along the Y-axis. First-type LEDs are placed on the first band in a row along the X-axis, parallel to the substrate's length. Second-, third-, and fourth-type LEDs are placed on the second, third, and fourth bands, respectively. Each type emits light with different optical properties. The Y-axis is perpendicular to the X-axis, with first-type LEDs aligned with fourth-type LEDs and second-type LEDs aligned with third-type LEDs. First-type LEDs are offset from second-type LEDs along the X-axis. The driver converts external power into four currents, adjusting their relative ratios to control the combined optical output.

First claim

The invention claimed is:

1. A lighting apparatus, comprising:
a flexible substrate having an elongated area, wherein the elongated area is divided into a first band, a second band, a third band, and a fourth band along a Y-axis direction;
a plurality of first-type LED modules disposed on the first band, wherein the first-type LED modules are aligned in a row along an X-axis direction, the X-axis direction being parallel to a longitudinal edge of the elongated area;
a plurality of second-type LED modules disposed on the second band;
a plurality of third-type LED modules disposed on the third band;
a plurality of fourth-type LED modules disposed on the fourth band, wherein the first-type LED modules, the second-type LED modules, the third-type LED modules, and the fourth-type LED modules emit light having different optical parameters, wherein the Y-axis direction is perpendicular to the X-axis direction, wherein the first-type LED modules are substantially aligned with the fourth-type LED modules along the Y-axis, wherein the second-type LED modules are aligned with the third-type LED modules along the Y-axis, and wherein the first-type LED modules are offset from the second-type LED modules in the X-axis direction by a predetermined distance; and
a driver configured to convert an external power source to generate four driving currents respectively supplied to the first-type LED modules, the second-type LED modules, the third-type LED modules, and the fourth-type LED modules, wherein the driver is further configured to adjust a relative ratio of the four driving currents to control a mixed optical parameter of the emitted light.

2. The lighting apparatus of claim 1 , wherein the first-type LED modules are blue light sources, the second-type LED modules are green light sources, the third-type LED modules are red light sources, and the fourth-type LED modules are yellow-green light sources.

3. The lighting apparatus of claim 2 , wherein the red light sources, the green light sources, the blue light sources, and the yellow-green light sources are arranged on the flexible substrate in a horizontally staggered configuration.

4. The lighting apparatus of claim 2 , wherein the red light sources, the green light sources, the blue light sources, and the yellow-green light sources are independent from one another.

5. The lighting apparatus of claim 2 , wherein the red light sources comprise blue LED chips coated with red phosphor, the green light sources comprise green LED chips, the blue light sources comprise blue LED chips, and the yellow-green light sources comprise blue LED chips coated with yellow-green phosphor.

6. The lighting apparatus of claim 5 , wherein the red phosphor and the yellow-green phosphor are applied to the surface of the LED chips by spraying or dispensing.

7. The lighting apparatus of claim 1 , further comprising a diffusion layer covering the flexible substrate, wherein the diffusion layer is a transparent adhesive mixed with diffusion powder.

8. The lighting apparatus of claim 1 , wherein the flexible substrate is a light-transmissive substrate.

9. The lighting apparatus of claim 1 , wherein terminals pins are provided at both ends of the flexible substrate.

10. The lighting apparatus of claim 9 , wherein each band has two terminals located on opposite sides of the band.

11. The lighting apparatus of claim 1 , wherein the flexible substrate is curled and arranged in a helical shape within a lampshade.

12. The lighting apparatus of claim 1 , wherein the first-type LED modules and the fourth-type LED modules are disposed on a first side of the flexible substrate, and the second-type LED modules and the third-type LED modules are disposed on a second side of the flexible substrate, wherein the first side and the second side are opposite sides of the flexible substrate.

13. The lighting apparatus of claim 1 , wherein the first-type LED modules are disposed on a first side of the flexible substrate, and a lens is positioned on a second side of the flexible substrate at a location corresponding to each first-type LED module, wherein the first side and the second side are opposite sides of the flexible substrate.

14. The lighting apparatus of claim 1 , wherein the first-type LED modules are disposed on a first side of the flexible substrate, and a heat sink module is positioned on a second side of the flexible substrate at a location corresponding to each first-type LED module, wherein the first side and the second side are opposite sides of the flexible substrate.

15. The lighting apparatus of claim 14 , wherein the heat sink modules are connected together to guide heat away from the first-type LED modules.

16. The lighting apparatus of claim 15 , wherein multiple heat sink modules transmit heat to a heat sink block.

17. The lighting apparatus of claim 14 , wherein the heat sink module is transparent.

18. The lighting apparatus of claim 1 , wherein the first-type LED modules, the second-type LED modules, the third-type LED modules, and the fourth-type LED modules are respectively connected in series.

19. The lighting apparatus of claim 1 , wherein multiple uneven surfaces are formed on the flexible substrate to enhance light mixing.

20. The lighting apparatus of claim 1 , further comprising a torsion sensor configured to detect the twisting state of the flexible substrate, wherein the driver adjusts the driving currents based on the detected twisting state.

Assignees

• Leedarson Lighting Co Ltd

Inventors

• Chen Huiwu
• Liu Zongyuan
• Chen Xiaobo
• Zheng Yongshu
• Luo Cheng

Classifications

• F21V29/713

  in direct thermal and mechanical contact of each other to form a single system · CPC title

• F21Y2105/12

  characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities · CPC title

• F21Y2107/70

  on flexible or deformable supports or substrates, e.g. for changing the light source into a desired form · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V23/06

  the elements being coupling devices {, e.g. connectors} · CPC title