Adapting drive current for emitters based on characteristics of a cover

Patent metadata

Field	Value
Publication number	US-12017578-B2
Application number	US-202117926494-A
Country	US
Kind code	B2
Filing date	May 18, 2021
Priority date	May 18, 2020
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

An automobile rear lighting includes a first emitter that emits a first light through a cover and a second emitter that emits a second light, different from the first light, through the cover such that an output light including the first light and the second light is emitted through the cover. The automobile rear lighting also includes a driving apparatus. The driving apparatus provides a first driving current to the first emitter and a second driving current to the second emitter. The driving apparatus adapts a magnitude of the first driving current and the second driving current based on at least one of at least one property of the cover or at least one optical component of the automobile rear lighting and a pre-defined color coordinates specification for the output light.

First claim

What is claimed is:

1. An automobile rear lighting, comprising:
a first emitter configured to emit a first light through a cover;
a second emitter configured to emit a second light, different from the first light, through the cover such that an output light including the first light and the second light is emitted through the cover; and
a driving apparatus configured to provide a first driving current to the first emitter and a second driving current to the second emitter, the driving apparatus being configured to adapt a magnitude of the first driving current and the second driving current based on at least one property of the cover and a pre-defined specification for the output light.

2. The automobile rear lighting of claim 1 , wherein the driving apparatus comprises a separate driver for each of the first emitter and the second emitter.

3. The automobile rear lighting of claim 1 , wherein the separate driver for each of the first emitter and the second emitter are configured to provide a drive current independently of each other.

4. The automobile rear lighting of claim 1 , wherein the driving apparatus comprises a single driver for both the first emitter and the second emitter.

5. The automobile rear lighting of claim 1 , wherein the at least one property of the cover comprises a thickness of the cover.

6. The automobile rear lighting of claim 1 , wherein the at least one property of the cover comprises a material of the cover.

7. The automobile rear lighting of claim 1 , further comprising at least one temperature sensor configured to sense an ambient temperature near the first emitter and the second emitter, wherein the driving apparatus is further configured to adapt the magnitude of the first driving current and the second driving current based on the ambient temperature sensed by the at least one temperature sensor.

8. The automobile rear lighting of claim 1 , further comprising:
a third emitter configured to emit a third light, different from at least one of the first light or the second light, such that the output light includes the first light, the second light and the third light emitted through the cover, wherein the driving apparatus is further configured to provide a third driving current to the third emitter.

9. The automobile rear lighting of claim 8 , wherein the driving apparatus further comprises a separate driver for each of the first emitter, the second emitter and the third emitter.

10. The automobile rear lighting of claim 8 , wherein the driving apparatus further comprises a single driver for all of the first emitter, the second emitter and the third emitter.

11. The automobile rear lighting of claim 8 , wherein the third emitter is one of a blue LED or a blue LED covered by a green emitting phosphor.

12. The automobile rear lighting of claim 8 , wherein the first emitter, the second emitter and the third emitter are one of a single, multi-color packaged LED or a single, multi-color Chip-on-Board LED.

13. The light source of claim 1 , wherein:
the cover is red,
the first emitter is a blue light emitting diode (LED),
the second emitter is a blue LED covered by a green emitting phosphor, and
the color coordinates specification is that of a white color point.

14. The light source of claim 1 , wherein the cover is at least partially transparent.

15. A method for implementing automobile rear lightings meeting a color coordinates specification, the method comprising:
driving a first automobile rear lighting with a first drive current having a first magnitude using a first driving apparatus such that a first output light is transmitted through a first cover, at least one of the first cover or at least one optical component of the first automobile rear lighting comprising a first plurality of properties;
driving a second automobile rear lighting with a second drive current having a second magnitude using a second driving apparatus such that a second output light is transmitted through a second cover, at least one of the second cover or at least one optical component of the second automobile rear lighting comprising a second plurality of properties, at least one of the first plurality of properties being different from the second plurality of properties; and
adapting at least one of the magnitude of the first drive current or the magnitude of the second drive current such that the first output light and the second output light meets the color coordinates specification.

16. The method of claim 15 , further comprising sensing an ambient temperature in a vicinity of the first automobile rear lighting and the second automobile rear lighting, wherein the adapting the at least one of the magnitude of the first drive current or the magnitude of the second drive current is based at least in part on the sensed ambient temperature.

17. The method of claim 15 , wherein the first driving apparatus and the second driving apparatus are identical.

18. The method of claim 15 , wherein the first plurality of properties and the second plurality of properties comprise at least one of a thickness of the first cover, a thickness of the second cover, a material of the first cover or a material of the second cover.

Assignees

• Lumileds Llc

Inventors

• Jost Peter
• Timinger Andreas

Classifications

• B60Q1/2696

  Mounting of devices using LEDs · CPC title

• B60Q3/80

  Circuits; Control arrangements (for dashboards B60Q3/16; for mass transit vehicles B60Q3/47) · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21W2107/10

  for land vehicles · CPC title

• H05B47/105

  in response to determined parameters · CPC title