Circuit and method for driving light emitting diodes

Details Circuit and method for driving light emitting diodes Circuit and method for driving light emitting diodes

2008-04-18

2011-11-01

Mengistu, Amare (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C315S169300

Reexamination Certificate

active

08049690

ABSTRACT:
A circuit and a method for driving light emitting diodes (LEDs) are provided. First, an input voltage is converted into an output voltage and the output voltage is transmitted to the anode terminals of LED strings. The output voltage is reduced when the output voltage is greater than a first threshold voltage and the output voltage is reduced when the lowest level among the cathode terminal voltages of all the LED strings is greater than a second threshold voltage. Thus, the output voltage can be maintained at a lower level for driving all the LED strings to reduce unnecessary power wastage.

REFERENCES:
patent: 7436378 (2008-10-01), Ito et al.
patent: 2006/0186827 (2006-08-01), Ragonesi et al.
patent: 2008/0054815 (2008-03-01), Kotikalapoodi et al.
patent: WO 2007071033 (2007-06-01), None

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