Optoelectronic device and adaptive illumination system using the same

Patent metadata

Field	Value
Publication number	US-10285236-B2
Application number	US-201815948642-A
Country	US
Kind code	B2
Filing date	Apr 9, 2018
Priority date	Sep 8, 2017
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

An automotive headlight is disclosed including: an optical unit including a plurality of optical elements, each optical element having a different central direction; a segmented light-emitting diode (LED) chip including a plurality of LEDs that are separated by trenches formed on the segmented LED chip and arranged in a plurality of sections, each section being aligned with a different respective optical element, and each section including at least one first LED and at least one second LED; and a controller configured to: apply a forward bias to each of the first LEDs, apply a reverse bias to each of the second LEDs, and change a brightness of the first LEDs in any section based on a signal generated by the second LED in that section.

First claim

What is being claimed is:

1. An automotive headlight comprising:
an optical unit including a plurality of optical elements, each optical element having a different central direction;
a segmented light-emitting diode (LED) chip including a plurality of LEDs that are separated by trenches formed on the segmented LED chip and arranged in a plurality of sections, each section being aligned with a different respective optical element, and each section including at least one first LED and at least one second LED; and
a controller configured to: apply a forward bias to each of the first LEDs, apply a reverse bias to each of the second LEDs, and change a brightness of the first LEDs in any section based on a signal generated by the second LED in that section.

2. The automotive headlight of claim 1 , wherein aligning each of the sections in the LED chip with a different optical element causes each section of the segmented LED chip to be associated with a different portion of a space that is illuminated by the automotive headlight.

3. The automotive headlight of claim 1 , wherein each section of the segmented LED chip is operable to receive light that is incident on the optical unit from the central direction of the respective optical element that is aligned with the section.

4. The automotive headlight of claim 1 , wherein each section of the segmented LED chip is operable to emit light in the central direction of the respective optical element that is aligned with the section.

5. The automotive headlight of claim 1 , wherein at least one optical element in the optical unit includes an aperture configured to guide light that is incident on the optical element from the optical element's central direction while absorbing light that is incident on the optical element from another direction.

6. The automotive headlight of claim 1 , wherein at least one optical element in the optical unit includes a lens.

7. The automotive headlight of claim 1 , wherein changing the brightness of the first LEDs includes one of dimming the first LEDs and turning off the first LEDs.

8. An automotive headlight comprising:
an optical unit including a plurality of optical elements, each optical element having a different central direction;
a segmented light-emitting diode (LED) chip including a plurality of LEDs that are separated by trenches formed on the segmented LED chip and arranged in a plurality of sections, each section being aligned with a different respective optical element in the optical unit, and each section including at least one first LED and at least one second LED; and
a controller configured to: apply a forward bias to each of the first LEDs, apply a reverse bias to each of the second LEDs, detect light emitted from an oncoming vehicle by using one or more of the second LEDs, and execute an adaptive action in response to detecting the light emitted from the oncoming vehicle, the adaptive action including decreasing a brightness of a first section of the LED chip based on a signal that is generated by a respective second LED located in the first section, and decreasing a brightness of a second section of the LED chip based on a signal that is generated by a respective second LED located in the second section.

9. The automotive headlight of claim 8 , wherein the brightness of the first section of the LED chip is decreased by a first amount, and the brightness of the second section of the LED chip is decreased by a second amount that is different from the first amount.

10. The automotive headlight of claim 8 , wherein the controller is further configured to use one or more first LEDs in the LED chip to transmit a message for preventing a blinking condition from occurring, the message being transmitted to the oncoming vehicle by using a visible light communication (VLC) protocol.

11. The automotive headlight of claim 8 , wherein each section of the segmented LED chip is operable to receive light that is incident on the optical unit from the central direction of the respective optical element that is aligned with the section.

12. The automotive headlight of claim 8 , wherein each section of the segmented LED chip is operable to emit light in the central direction of the respective optical element that is aligned with the section.

13. The automotive headlight of claim 8 , wherein at least one optical element in the optical unit includes an aperture configured to guide light that is incident on the optical element from the optical element's central direction while absorbing light that is incident on the optical element from another direction.

14. The automotive headlight of claim 8 , wherein at least one optical element in the optical unit includes a lens.

15. An automotive headlight comprising:
an optical unit including a plurality of optical elements, each optical element having a different central direction;
a segmented light-emitting diode (LED) chip including a plurality of LEDs that are separated by trenches formed on the segmented LED chip and arranged in a plurality of sections, each section including at least one first LED and at least one second LED, each section being aligned with a different respective optical element in the optical unit; and
a controller configured to: apply a forward bias to each of the first LEDs, apply a reverse bias to each of the second LEDs, detect light emitted from an oncoming vehicle by using one or more of the second LEDs, and execute an adaptive action in response to detecting the light emitted from the oncoming vehicle, the adaptive action including turning off the first LEDs in a first section of the LED chip, while keeping the first LEDs in a second section of the LED chip turned on, the first LEDs in the first section being turned off based on a signal that is generated by a respective second LED located in the first section.

16. The automotive headlight of claim 15 , wherein aligning each of the sections in the LED chip with a different optical element causes each section of the segmented LED chip to be associated with a different portion of a space that is illuminated by the automotive headlight.

17. The automotive headlight of claim 15 , wherein each section of the segmented LED chip is operable to receive light that is incident on the optical unit from the central direction of the respective optical element that is aligned with the section.

18. The automotive headlight of claim 15 , wherein each section of the segmented LED chip is operable to emit light in the central direction of the respective optical element that is aligned with the section.

19. The automotive headlight of claim 15 , wherein at least one optical element in the optical unit includes an aperture configured to guide light that is incident on the optical element from the optical element's central direction while absorbing light that is incident on the optical element from another direction.

20. The automotive headlight of claim 15 , wherein at least one optical element in the optical unit includes a lens.

Assignees

• Lumileds Llc

Inventors

• Nelson Erik Charles
• Wildeson Isaac
• Deb Parijat
• Vampola Kenneth

Classifications

• G01J1/32 Primary

  adapted for automatic variation of the measured or reference value (regulation of light intensity G05D25/00) · CPC title

• H05B47/11

  by determining the brightness or colour temperature of ambient light · CPC title

• H05B45/44

  with an active control inside an LED matrix · CPC title

• G01J1/0488

  with spectral filtering · CPC title

• B60Q2300/42

  oncoming vehicle · CPC title