Systems, devices, components and methods for controllably configuring the brightness of light emitted by an automotive LED illumination system

• US 20080055065A1
• Filed: 08/30/2006
• Published: 03/06/2008
• Est. Priority Date: 08/30/2006
• Status: Abandoned Application

• Current Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.), Avago Technologies Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Feldmeier, David Charles
• Application Number:
  US11/512,933
• Publication Number:
  US 20080055065A1
• Time in Patent Office: Days
• US Class Current: 340/458
• CPC Class Codes: B60Q 1/1423 Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
• CPC Class Codes: B60Q 2300/054 Variable non-standard intensity, i.e. emission of various beam intensities different from standard intensities, e.g. continuous or stepped transitions of intensity
• CPC Class Codes: B60Q 2300/21 Manual control
• CPC Class Codes: B60Q 2300/312 Adverse weather
• CPC Class Codes: B60Q 2300/314 Ambient light
• CPC Class Codes: B60Q 2300/42 oncoming vehicle
• CPC Class Codes: C09K 9/02 Organic tenebrescent materials
• CPC Class Codes: F21S 41/14 characterised by the type of light source
• CPC Class Codes: F21S 41/143 the main emission direction of the LED being parallel to the optical axis of the illuminating device
• CPC Class Codes: F21S 41/145 the main emission direction of the LED being opposite to the main emission direction of the illuminating device
• CPC Class Codes: F21S 41/148 the main emission direction of the LED being perpendicular to the optical axis
• CPC Class Codes: F21S 41/151 arranged in one or more lines
• CPC Class Codes: F21S 41/153 arranged in a matrix
• CPC Class Codes: F21S 41/663 by switching light sources by switching incandescent light sources F21S41/162
• CPC Class Codes: F21V 23/0442 activated by means of a sensor, e.g. motion or photodetectors
• CPC Class Codes: F21V 23/0457 the sensor sensing the operating status of the lighting device, e.g. to detect failure of a light source or to provide feedback to the device
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

Disclosed are various embodiments of system, devices, components and methods for controllably configuring the brightness of light emitted by an automotive LED illumination system. The brightness levels of LEDs, or clusters or groups of LEDs, may be varied smoothly or in step-wise fashion to produce virtually any desired pattern of collimated light. The pattern may be varied in respect of time, space or both time and space. Light and other types of sensors may be employed to provide feedback control as a further means of controllably configuring the brightness of light emitted by such a system in response to changes in external and other conditions.

Claims

1. An automotive illumination system, comprising an LED light source and an LED brightness control circuit operably connected thereto, the brightness control circuit being configured to control the brightness of light emitted by the LED light source between a minimum brightness level and a maximum brightness level, wherein the minimum brightness level may be configured to be greater than zero.

2. The automotive illumination system of claim 1, further comprising at least one light sensor configured to sense the brightness of light emitted by the LED light source, the light sensor being operably connected to the brightness control circuit, the brightness control circuit, the LED light source and the light sensor comprising a feedback control system for controlling and adjusting the brightness of light emitted by the LED light source.

3. The automotive illumination system of claim 2, wherein the light sensor is at least one of a photosensor, a photodiode and a photodetector.

4. The automotive illumination system of claim 2, wherein the LED light source is an LED semiconductor and the light sensor is incorporated therein.

5. The automotive illumination system of claim 1, wherein the plurality of LED light sources comprises one or more LED semiconductors.

6. The automotive illumination system of claim 5, wherein the one or more LED semiconductors further comprises at least one light sensor.

7. The automotive illumination system of claim 5, wherein the one or more LED semiconductors further comprises fluorescent material disposed adjacent one or more LEDs thereof.

8. The automotive illumination system of claim 1, wherein the LED light source comprises one or more LED supports.

9. The automotive illumination system of claim 1, wherein the LED light source comprises at least one white LED or phosphor-converted white LED.

10. The automotive illumination system of claim 1, wherein the LED light source comprises at least one cluster of LEDs comprising at least one LED of a first color and at least one LED of a second color, wherein the first color is different from the second color.

11. The automotive illumination system of claim 1, wherein LED light source comprises at least one cluster of red, green and blue LEDs.

12. The automotive illumination system of claim 1, further comprising at least one environmental sensor configured to sense at least one environmental characteristic, the environmental sensor being operably connected to the brightness control circuit, the brightness control circuit and the environmental sensor comprising a feedback control system for controlling and adjusting the brightness of light emitted by the LED light source.

13. The automotive illumination system of claim 12, wherein the environmental sensor is at least one of an external lighting level sensor, an automotive cabin lighting level sensor, on-coming headlight sensor, a rain sensor, a water sensor, a mist sensor, a snow sensor, an ice sensor, a sleet sensor, a fog sensor, a road width sensor, a road condition sensor, a road type sensor, an accelerometer, an automotive speed sensor, a pedestrian sensor, an off-axis vehicle sensor, a moving object sensor, an ignition key sensor, a keyless entry remote control sensor, a door sensor, a trunk sensor, an alarm sensor, a proximity sensor, a seatbelt sensor, and an accident sensor.

14. The automotive illumination system of claim 1, wherein the brightness control circuit further comprises an LED drive circuit operably connected to and disposed between the brightness control circuit and the LED light source.

15. The automotive illumination system of claim 1, wherein the brightness control circuit is further configured to vary the brightness of the LED light source spatially.

16. The automotive illumination system of claim 1, wherein the brightness control circuit is further configured to vary the brightness of the LED light source in respect of time.

17. The automotive illumination system of claim 1, wherein the brightness control circuit is further configured to vary the brightness of the LED light source in respect of time and space.

18. The automotive illumination system of claim 1, wherein the brightness control circuit is further configured to control the brightness of the LED light source according to at least first and second predetermined patterns.

19. The automotive illumination system of claim 1, wherein the brightness control circuit is configured to permit the system to operate as at least one of a headlight, a daytime modulator, a turn signal, a tail light, a brake light, a running light, a fog light and a backup light, or any combination thereof.

20. The automotive illumination system of claim 1, wherein the system is configured to operate as a low-beam headlight when the brightness control circuit is in a first state, and as high-beam headlight when the brightness control circuit is in a second state.

21. The automotive illumination system of claim 1, wherein the system is configured to operate as a low-intensity tail light when the brightness control circuit is in a first state, and as high-intensity tail light when the brightness control circuit is in a second state.

22. The automotive illumination system of claim 1, wherein the system is configured to operate as a tail light when the brightness control circuit is in a first state, and as turn signal and tail light when the brightness control circuit is in a second state.

23. The automotive illumination system of claim 1, further comprising an optical system for collimating light emitted by the plurality of LED light sources.

24. The automotive illumination system of claim 23, wherein the optical system further comprises a reflector.

25. The automotive illumination system of claim 24, wherein the reflector is at least one of a parabolic reflector, an elliptical reflector, a spherical reflector, a spheroidal reflector, an oblate reflector, an oblate spheroidal reflector, a chamfered reflector, and a reflective surface.

26. The automotive illumination system of claim 23, wherein the optical system further comprises a lens.

27. The automotive illumination system of claim 26, wherein the lens is at least one of a projection lens, a condenser lens, a concave lens, a convex lens, a planar lens, a plano-concave lens, a piano-convex lens, a translucent lens, a light-guiding lens, an LED lens, an internally-reflecting lens, a fresnel lens, a reflective surface, an optical mixer, and a color mixer.

28. The automotive illumination system of claim 23, wherein the optical system further comprises at least one of a shade, a diffuser, a screen, a secondary reflector, a retro-reflector, a light guide, and an optical manifold.

29. The automotive illumination system of claim 1, wherein the brightness control circuit further comprises user-controllable means for selecting or adjusting one or more brightness levels for the LED light sources.

30. The automotive illumination system of claim 1, wherein the brightness control circuit further comprises user-controllable means for selecting or adjusting one or more brightness patterns for the LED light sources.

31. The automotive illumination system of claim 1, wherein the brightness control circuit further comprises manufacturer-controllable hardware or software means for selecting or adjusting one or more brightness levels for the LED light sources.

32. The automotive illumination system of claim 1, wherein the brightness control circuit further comprises manufacturer-controllable hardware or software means for selecting or adjusting one or more brightness patterns for the LED light sources.

33. The automotive illumination system of claim 1, wherein the system further comprises means for updating or changing software loaded in the control circuit.

34. The automotive illumination system of claim 1, wherein the brightness control circuit further comprises at least one of a controller, a micro-controller, a processor, a micro-processor, a processing unit, a CPU, an ASIC, an integrated circuit and a chip.

35. An automotive illumination system, comprising an LED light source and an LED brightness control circuit operably connected thereto, the brightness control circuit being configured to control the relative amplitudes of power spectral distributions of light emitted by the LED light source between a minimum power spectral distribution and a maximum power spectral distribution, wherein the minimum power spectral distribution amplitude is greater than zero.

36. The automotive illumination system of claim 35, further comprising at least one light sensor configured to sense the brightness of light emitted by the LED light source, the light sensor being operably connected to the brightness control circuit, the brightness control circuit, the LED light source and the light sensor comprising a feedback control system for controlling and adjusting the brightness of light emitted by the LED light source.

37. An integrated circuit for an automotive illumination system, comprising an LED brightness control circuit configured to control the brightness of light emitted by an LED light source between a minimum brightness level and a maximum brightness level, wherein the minimum brightness level may be configured to be greater than zero.

38. The integrated circuit of claim 37, further comprising at least one signal input means corresponding to the output of a light sensor, the integrated circuit, the at least one signal input means and the light sensor output comprising a feedback control system for controlling and adjusting the brightness of light emitted by the LED light source.

39. The integrated circuit of claim 38, wherein the at least one signal input is provided by an analog-to-digital converter forming a portion of the integrated circuit.

40. The integrated circuit of claim 37, further comprising an LED drive circuit for driving the LED light sources.

41. An automobile comprising an automotive illumination system, the automotive illumination system comprising an LED light source and an LED brightness control circuit operably connected thereto, the brightness control circuit being configured to control the brightness of light emitted by the LED light source between a minimum brightness level and a maximum brightness level, wherein the minimum brightness level may be configured to be greater than zero.

42. The automobile of claim 41, further comprising at least one light sensor configured to sense the brightness of light emitted by the LED light source, the light sensor being operably connected to the brightness control circuit, the brightness control circuit, the LED light source and the light sensor comprising a feedback control system for controlling and adjusting the brightness of light emitted by the LED light source.

43. A method of controlling the brightness of light emitted by an automotive illumination system, the system comprising an LED light source and an LED brightness control circuit operably connected thereto, the brightness control circuit being configured to control the brightness of light emitted by the LED light source between a minimum brightness level and a maximum brightness level, wherein the minimum brightness level may be configured to be greater than zero, the method comprising adjusting the brightness of the light emitted by the LED light source.

44. A method of adjusting the brightness of light emitted by an automotive feedback control illumination system, the system comprising an LED light source and an LED brightness control circuit operably connected thereto, the brightness control circuit being configured to control the brightness of light emitted by the LED light source between a minimum brightness level and a maximum brightness level, the minimum brightness level being configurable to be greater than zero, and at least one light sensor configured to sense the brightness of light emitted by the LED light source, the light sensor being operably connected to the brightness control circuit, the brightness control circuit, the LED light source and the light sensor comprising a feedback control system for controlling and adjusting the brightness of light emitted by the LED light source, the method comprising adjusting the brightness of the light emitted by the LED light source using the feedback control system.

45. A method of making an automotive illumination system, the system comprising an LED light source and an LED brightness control circuit operably connected thereto, the brightness control circuit being configured to control the brightness of light emitted by the LED light source between a minimum brightness level and a maximum brightness level, wherein the minimum brightness level may be configured to be greater than zero, the method comprising providing the automotive illumination system.

46. A method of making an automotive feedback control illumination system, the system comprising an LED light source and an LED brightness control circuit operably connected thereto, the brightness control circuit being configured to control the brightness of light emitted by the LED light source between a minimum brightness level and a maximum brightness level, the minimum brightness level being configurable to be greater than zero, and at least one light sensor configured to sense the brightness of light emitted by the LED light source, the light sensor being operably connected to the brightness control circuit, the brightness control circuit, the LED light source and the light sensor comprising a feedback control system for controlling and adjusting the brightness of light emitted by the LED light source, the method comprising providing the automotive feedback control illumination system.

47. A method of installing an automotive illumination system, the system comprising an LED light source and an LED brightness control circuit operably connected thereto, the brightness control circuit being configured to control the brightness of light emitted by the LED light source between a minimum brightness level and a maximum brightness level, wherein the minimum brightness level is configurable to be greater than zero, the method comprising installing the automotive illumination system in an automobile.

48. A method of installing an automotive feedback control illumination system, the system comprising an LED light source and an LED brightness control circuit operably connected thereto, the brightness control circuit being configured to control the brightness of light emitted by the LED light source between a minimum brightness level and a maximum brightness level, the minimum brightness level being configurable to be greater than zero, and at least one light sensor configured to sense the brightness of light emitted by the LED light source, the light sensor being operably connected to the brightness control circuit, the brightness control circuit, the LED light source and the light sensor comprising a feedback control system for controlling and adjusting the brightness of light emitted by the LED light source, the method comprising installing the automotive feedback control illumination system in an automobile.