Coherent light generators – Particular beam control device – Optical output stabilization
Reexamination Certificate
2006-01-17
2006-01-17
Vo, Tuyet Thi (Department: 2821)
Coherent light generators
Particular beam control device
Optical output stabilization
C372S029020, C372S038070
Reexamination Certificate
active
06987787
ABSTRACT:
The LED brightness control system for a wide range of luminance control includes a brightness control module that provides a pulse width modulation (PWM) control signal and a peak current control signal. A pulse width modulation (PWM) converter circuit receives the PWM control signal and converts it to a PWM signal. A multiplier receives the PWM signal and the peak current control signal from the brightness control module and multiplies the same to provide a light emitting diode (LED) current control signal with a variable “on” time as well as variable “on” level. A voltage-controlled current source utilizes the LED current control signal and an LED current feedback signal for providing an LED current. An LED illuminator array receives the LED current. A current sensing element connected to the LED illuminator array for providing an LED current feedback signal representing LED peak current. The voltage-controlled current source controls a drive voltage to the LED illuminator array at a commanded level.
REFERENCES:
patent: 4745358 (1988-05-01), Yada et al.
patent: 4827116 (1989-05-01), Takagi et al.
patent: 5803579 (1998-09-01), Turnbull
patent: 6392358 (2002-05-01), Runau
patent: 6419372 (2002-07-01), Shaw
patent: 6457837 (2002-10-01), Steffensmeier
patent: 6521879 (2003-02-01), Rand
patent: 6540363 (2003-04-01), Steffensmeier
patent: 6590560 (2003-07-01), Lucas
patent: 6597209 (2003-07-01), Iguchi et al.
patent: 6608614 (2003-08-01), Johnson
patent: 6639349 (2003-10-01), Bahadur
patent: 6666896 (2003-12-01), Peng
patent: 6825619 (2004-11-01), Norris
patent: 2005/0129075 (2005-06-01), Anderson et al.
Eppele Kyle
Jensen Nathan O.
Rockwell Collins
Vo Tuyet Thi
LandOfFree
LED brightness control system for a wide-range of luminance... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with LED brightness control system for a wide-range of luminance..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and LED brightness control system for a wide-range of luminance... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3589691