CIRCUIT AND METHOD FOR CONTROLLING LIGHT EMITTING DIODE
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United States of America Patent
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Issued Date -
Jan 2, 2014
app pub date -
Aug 28, 2012
filing date -
Jun 28, 2012
priority date (Note) -
Abandoned
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Abstract
A method for controlling a current flowing through one or more light emitting diodes (LEDs) comprising receiving a Pulse Width Modulation (PWM) control signal, which includes rising and falling edges; receiving a first voltage signal; generating a second voltage signal based on the PWM control signal and the first voltage signal, wherein the second voltage increases gradually in response to one of the rising and falling edges of the PWM signal and decreases gradually in response to the other of the rising and falling edges of the PWM signal; and providing a current to the one or more LEDs, wherein the current varies gradually according to the second voltage.
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