LED array driving apparatus and backlight driving apparatus...

Details LED array driving apparatus and backlight driving apparatus... LED array driving apparatus and backlight driving apparatus...

2007-10-02

2007-10-02

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S308000, C315S312000, C315SDIG002, C363S079000

Reexamination Certificate

active

11319723

ABSTRACT:
The present invention relates to an LED array driving apparatus and a backlight driving apparatus using the same which enables regulation of analogue and PWM dimming for each channel and LED of a backlight, thereby allowing uniform luminance and color in all regions of backlight. The invention converts power with a constant voltage regulator to provide PWM pulse type power to the LED array having a plurality of LEDs connected in series. It regulates the on/off interval of the constant voltage regulator via a PWM dimmer to adjust the duty ratio of the PWM pulse. Further, it regulates the level of the driving current detected at the LED array via the feedback controller and analogue dimmer to apply to the constant voltage regulator by feedback process, thus regulating the amplitude of the PWM pulse.

REFERENCES:
patent: 6016038 (2000-01-01), Mueller et al.
patent: 6023037 (2000-02-01), Church et al.
patent: 6474839 (2002-11-01), Hutchison
patent: 6636003 (2003-10-01), Rahm et al.
patent: 6933767 (2005-08-01), Bucks et al.
patent: 7081708 (2006-07-01), Ito et al.
patent: 2004/0245946 (2004-12-01), Halter

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