LED light source for backlighting with integrated electronics

Details LED light source for backlighting with integrated electronics LED light source for backlighting with integrated electronics

2008-01-08

2008-01-08

Crosland, Donnie L. (Department: 2612)

Communications: electrical

Visual indication

Using light emitting diodes

C340S815470, C345S045000, C345S102000, C362S800000

Reexamination Certificate

active

11212185

ABSTRACT:
An LED backlight structure for setting voltages and currents for LEDs. Red LEDs are connected in series between a first voltage regulator and a first controllable current source, green LEDs are connected in series between a second voltage regulator and a second controllable current source, blue LEDs are connected in series between a third voltage regulator and a third controllable current source. The current sources may be linear current regulators controlled to balance the three colors to achieve a target light output of the board using a light detection chamber. PWM controllers control transistor switches connected in parallel across groups of LEDs, where the duty cycles set the average current through each group of LEDs. The control values used to achieve target light characteristics are stored in memory. The PWM controller may control brightness levels of the LEDs. The backlight may be for an LCD television.

REFERENCES:
patent: 6069597 (2000-05-01), Hansen
patent: 6150774 (2000-11-01), Mueller et al.
patent: 6630801 (2003-10-01), Schuurmans
patent: 6897624 (2005-05-01), Lys et al.
patent: 2002/0070914 (2002-06-01), Bruning et al.
“Synchronous Buck-Boost High Power White LED Driver,” Linear Technology LTC3453 Data Sheet, pp. 1-12, Jan. 2004.
“480mA White LED 1×/1.5×/2× Charge Pump for Backlighting and Camera Flash,” Maxim Integrated Products MAX1576 Data Sheet, pp. 1-14, Jan. 2004.
“LINEARlight Colormix OS-LM01M,” OSRAM Data Sheet, pp. 1-4, Apr. 8, 2005.

Affiliated with

Also associated with

Rating

LED light source for backlighting with integrated electronics 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 light source for backlighting with integrated electronics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and LED light source for backlighting with integrated electronics will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3921105