Automotive lighting device and lighting system

Patent metadata

Field	Value
Publication number	US-11028981-B2
Application number	US-202016787918-A
Country	US
Kind code	B2
Filing date	Feb 11, 2020
Priority date	Feb 12, 2019
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

Lighting device, in particular for automotive applications, comprising a plurality of lighting elements, wherein each lighting element comprises at least one or more light emitting diodes (LEDs). The lighting device comprises a first connector for connecting the lighting device to a lighting driver. The lighting elements are arranged in a row in order to form a luminous band. The plurality of lighting elements is divided into more than one group, each group consisting of at least one or more lighting elements. The lighting elements of one group are electrically connected in series. The groups are electrically connected in parallel in order to control each group individually.

First claim

The invention claimed is:

1. A lighting device for an automotive application, the lighting device comprising:
a plurality of lighting elements, each lighting element of the lighting elements comprising at least one or more light emitting diodes, the lighting elements arranged in a row to form a luminous band and divided into groups including a first group and a second group, each group of the groups including two or more lighting elements of the lighting elements electrically connected in series on separate, directly adjacent boards, a first lighting element of a group directly electrically connected by more than one electrical wire to a second lighting element of the group, the lighting elements of each of the groups electrically connected in series by a ground wire; and
a first connector for connecting the lighting device to a single lighting driver by first, second, and third pins, the first pin electrically connected to only the first group by a first wire, the second pin electrically connected to only the second group by a second wire, and the third pin electrically connected to both the first and second groups by the ground wire.

2. A lighting device according to claim 1 , wherein a number of wires directly connecting a board of the boards to a directly adjacent board of the boards is between two and four and the first connector is configured to connect each of the wires to the lighting driver.

3. A lighting device according to claim 2 , wherein the lighting device is flexible in two directions and/or twistable along a longitudinal axis.

4. A lighting device according to claim 1 ,
wherein a light emitting area of the lighting device has a width of less than 10 mm, and/or
wherein the width of the lighting device is less than 10 mm, and/or
wherein the height of the lighting device is less than 10 mm.

5. A lighting device according to claim 1 ,
wherein the lighting elements and the wires are at least partially surrounded by a polymer, and
wherein the polymer comprises a first part, which first part is transparent and is arranged in front of the lighting elements in the direction of light emission, and a second part which is opaque.

6. A lighting device according to claim 1 , wherein the wires coupled between two lighting elements are individual wires separated from each other and are arranged in parallel.

7. A lighting device according to claim 6 , wherein the length of the wires between two directly adjacent boards is greater than the distance between two directly adjacent lighting elements, and
wherein wires closer to respective edges of directly adjacent boards is longer than a wire further from the respective edges.

8. A lighting device according to claim 1 , wherein at least two groups consist of the same number of lighting elements.

9. A lighting device according to claim 1 :
wherein the lighting elements are divided into more groups including a third group and a fourth group;
further comprising a second connector for connecting the lighting device to the single lighting driver by fourth and fifth pins, the fourth pin electrically connected to only the third group by a fourth wire, the fifth pin electrically connected to only the fourth group by a fifth wire
wherein the first connector is arranged at the beginning of the row and the second connector is arranged at the end of the row.

10. A lighting device according to claim 9 ,
wherein a third connector is arranged between the first connector and the second connector along the row for connecting at least a fifth group of lighting elements to the lighting driver.

11. A lighting device according to claim 1 ,
wherein the lighting device emits light in one direction only, and
wherein an opening angle of the emitted light is below or equal to 180°.

12. A lighting device according to claim 1 , wherein each board comprises a printed circuit board.

13. A lighting system comprising:
a lighting device comprising:
a plurality of lighting elements, each lighting element of the lighting elements comprising at least one or more light emitting diodes, the lighting elements arranged in a row to form a luminous band and divided into groups including a first group and a second group, each group of the groups including two or more lighting elements of the lighting elements electrically connected in series on separate, directly adjacent boards, a first lighting element of a group directly electrically connected by more than one electrical wire to another lighting element of the group, the lighting elements of each group of the groups electrically connected in series by a ground wire; and
a first connector for connecting the lighting device to a single lighting driver by first, second, and third pins, the first pin electrically connected to only the first group by a first wire, the second pin electrically connected to only the second group by a second wire, and the third pin electrically connected to both the first and second groups by the ground wire; and
the lighting driver coupled to drive the lighting device.

14. A lighting system according to claim 13 , comprising an error detection module, wherein the error detection module is configured to detect an error in a lighting element of the lighting elements and/or in a group of lighting elements.

15. A lighting system according to claim 14 ,
wherein the error detection module is configured to detect a current and/or voltage through each of the groups of lighting elements individually, and
wherein an error is identified upon detection of a current and/or voltage through one of the groups below or above a current threshold and/or voltage threshold.

16. A lighting system according to claim 14 ,
wherein the error detection module is configured to detect a current and/or voltage through each of the groups of lighting elements individually, and
wherein an error is detected by a deviation from the current and/or voltage through a first group with respect to the current and/or voltage through a second group, wherein the error is determined when the deviation exceeds a preset limit.

17. A method of configuring a first lighting device on an automotive, the method comprising:
situating the first lighting device below or between second lighting devices of the automotive, the first lighting device including a plurality of lighting elements, each lighting element of the lighting elements comprising one or more light emitting diodes, the lighting elements arranged in a row to form a luminous band and divided into groups including a first group and a second group, each group of the groups including two or more lighting elements of the lighting elements electrically connected in series on separate, directly adjacent boards, a first lighting element of a group directly electrically connected by more than one electrical wire to another lighting element of the group, the lighting elements of each group of the groups electrically connected in series to a ground wire; and
connecting the lighting device, via a first connector, to a single lighting driver by first, second, and third pins, the first pin electrically connected to only the first group by a first wire, the second pin electrically connected to only the second group by a second wire, and the third pin electrically connected to both the first and second groups by the ground wire.

18. The method of claim 17 , further comprising mechanically coupling directly adjacent boards by more than two electrical wires.

Assignees

• Lumileds Llc

Inventors

• Karbowski Udo
• Kleijnen Christian
• Schug Josef

Classifications

• H05B45/40 Primary

  Details of LED load circuits · CPC title

• B60Q3/56

  Lighting devices mounted on elongate supports, e.g. on flexible arms · CPC title

• F21S4/24 Primary

  of ribbon or tape form, e.g. LED tapes · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21Y2103/10

  comprising a linear array of point-like light-generating elements · CPC title