DRIVE CIRCUIT FOR A LIGHT EMITTING DIODE ARRAY
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United States of America Patent
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Issued Date -
May 24, 2007
app pub date -
Nov 22, 2005
filing date -
Nov 22, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A voltage regulator supplies a drive voltage to a light emitting diode array. A current regulator has a plurality of current regulating terminals, correspondingly coupled to a plurality of constituting branches of the light emitting diode array, for controlling a plurality of drive currents respectively flowing through the plurality of constituting branches. An activation circuit causes the drive voltage to continuously rise until each of voltages at the current regulating terminals exceeds a reference voltage, thereby ensuring that each of the plurality of drive currents reaches a regulation current. Afterwards, a selection circuit selects a minimum voltage from all of the voltages at the current regulating terminals to serve as a feedback control signal for controlling the voltage regulator.
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