Controller circuitry for light emitting diodes

Details Controller circuitry for light emitting diodes Controller circuitry for light emitting diodes

2005-10-11

2010-12-07

Eisen, Alexander (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S039000, C345S046000, C315S167000, C315S169300

Reexamination Certificate

active

07847783

ABSTRACT:
A method according to one embodiment may include supplying power to an LED array having at least a first string of LEDs and a second string of LEDs coupled in parallel, each of the strings includes at least two LEDs. The method of this embodiment may also include comparing a first feedback signal from the first string of LEDs and a second feedback signal from the second string of LEDs. The first feedback signal is proportional to current in said first string of LEDs and said second feedback signal is proportional to current in said second string of LEDs. The method of this embodiment may also include controlling a voltage drop of at least the first string of LEDs to adjust the current of the first string of LEDs relative to the second string of LEDs, based on, at least in part, the comparing of the first and second feedback signals. Of course, many alternatives, variations, and modifications are possible without departing from this embodiment.

REFERENCES:
patent: 7265681 (2007-09-01), Chen
patent: 7307614 (2007-12-01), Vinn
patent: 7365718 (2008-04-01), Tsuchida et al.

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