Method and apparatus for providing selectively colored light

• US 7,990,079 B2
• Filed: 02/06/2008
• Issued: 08/02/2011
• Est. Priority Date: 02/06/2008
• Status: Expired due to Fees

• Current Assignee: Grupo Antolin-Irausa, S.A.
• Original Assignee: Magna International Incorporated
• Inventors: Dixon, Mark E., Hargenrader, John T.
• Primary Examiner(s): Philogene; Haissa
• Application Number:
  US12/026,992
• Publication Number:
  US 20090196031A1
• Time in Patent Office: 1,273 Days
• Field of Search: 315/291, 315293-295, 315/297, 315/312, 315/362, 362/227, 362/230, 362/231, 362/236, 362/601, 362/612, 362/613
• US Class Current: 315/312
• CPC Class Codes: B60Q 1/0088 Details of electrical connections B60Q1/305 takes precedence; electrical connection of the light source itself F21S41/192, F21S43/195
• CPC Class Codes: B60Q 1/2696 Mounting of devices using LEDs
• CPC Class Codes: B60Q 3/80 Circuits; Control arrangements for dashboards B60Q3/16; for mass transit vehicles B60Q3/47
• CPC Class Codes: F21S 10/02 changing colors F21S10/002 - F21S10/007, F21S10/04 take precedence
• CPC Class Codes: F21V 23/00 Arrangement of electric circuit elements in or on lighting devices characterised by cooling arrangements F21V29/508
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

An apparatus for providing selectively-colored light is disclosed. The apparatus includes a circuit having a plurality of diodes each including an anode and a cathode, wherein the plurality of diodes include a first diode that emits a first light defined by a first wavelength, a second diode that emits a second light defined by a second wavelength, and a third diode that emits a third light defined by a third wavelength, wherein a summation of one or more of the first, second and third light defines a selectively-colored light; and a controller including a first output connected to the anode of the first diode, and the cathode of the second diode, a second output connected to the cathode of the first diode, the anode of the second diode, and the anode of the third diode, and a third output connected to the cathode of the third diode. A method is also disclosed.

Claims

1. An apparatus for providing selectively-colored light, consisting of:

a circuit including

a plurality of diodes each including an anode and a cathode, wherein the plurality of diodes include

a first diode that emits a first light defined by a first wavelength,

a second diode that emits a second light defined by a second wavelength, and

a third diode that emits a third light defined by a third wavelength, wherein a summation of one or more of the first, second and third light defines a selectively-colored light; and

a controller including

a first output connected to

the anode of the first diode, and

the cathode of the second diode,

a second output connected to

the cathode of the first diode,

the anode of the second diode, and

the anode of the third diode, and

a third output connected to

the cathode of the third diode.

2. The apparatus according to claim 1, wherein each of the first, second, and third wavelengths are unique and inclusive to the visible spectrum approximately ranging between 700 nm and 400 nm.

3. The apparatus according to claim 2, wherein the first diode is a red diode that emits visible red light, wherein the second diode is a green diode that emits visible green light, wherein the third diode is a blue diode that emits visible blue light.

4. The apparatus according to claim 3, wherein the plurality of diodes includes a fourth diode, wherein the second output is connected to the cathode of the fourth diode, wherein the third output is connected to the anode of the fourth diode.

5. The apparatus according to claim 4, wherein the fourth diode emits light selected from the group consisting of white light, ultraviolet light or infrared light.

6. The apparatus according to claim 4 further comprising

a first resistor disposed between the cathode of the first diode and the second output of the controller,

a second resistor disposed between the anode of the second diode and the second output of the controller,

a third resistor disposed between the anode of the third diode and the second output of the controller, and

a fourth resistor disposed between the anode of the fourth diode and the second output of the controller.

7. The apparatus according to claim 4, wherein the white diode comprises a blue diode covered with a yellowish phosphor coating.

8. The apparatus according to claim 1, wherein the circuit is interfaced with a vehicle, wherein the selectively-colored light is emitted from within a passenger compartment area of the vehicle and/or exterior the passenger compartment area of the vehicle.

9. A method for providing selectively-colored light from the circuit recited in claim 1, comprising the steps of:

providing a diode control signal to the second output of the controller; and

permitting an emission of light from one or more of the diodes depending on

a low or high state of the control signal, and

a high state of a diode activation signal sent to one or more of the first and third outputs.

10. The method according to claim 9, wherein the control signal is a pulse width modulation (PWM) signal.

11. The method according to claim 10, wherein the duty cycle of the PWM signal is approximately 50%.

12. A method for providing selectively-colored light from a circuit including a controller having first, second and third outputs, said method comprising the steps of:

connecting the first output of the controller to an anode of a first diode and a cathode of a second diode;

connecting the second output of the controller to a cathode of the first diode and an anode of the second diode and an anode of a third diode; and

connecting the third output of the controller to a cathode of the third diode.

13. The method according to claims 12 further comprising the steps of:

providing a diode on/off control signal to the second output of the controller;

providing a diode activation signal to each of the first and third outputs; and

emitting light from one or more of the diodes to provide a saturated or unsaturated light.

14. The method according to claim 13, wherein the on/off control signal is a pulse width modulation (PWM) signal.

15. The method according to claim 14, wherein the duty cycle of the PWM signal is approximately 50%.

16. The method according to claim 14, wherein light emitted from the first diode is permitted to occur during the first half of the period of the PWM signal, wherein light emitted from each of the second and third diodes is permitting to occur during the second half of the period of the PWM signal.

17. The method according to claim 15 further comprising the step of

connecting the second output of the controller to a cathode of a fourth diode;

and

connecting the third output of the controller to an anode of the fourth diode.

18. The method according to claim 17, wherein light emitted from the fourth diode is permitted to occur during the first half of the period of the PWM signal.