LED driver circuit and method
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United States of America Patent
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Mar 26, 2002
Grant Date -
N/A
app pub date -
Dec 23, 1999
filing date -
Dec 23, 1999
priority date (Note) -
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Abstract
An LED driver circuit and method are disclosed where an array of light emitting diodes have a transistor connected to each respective array of light emitting diodes. A PWM controller has an input for receiving a voltage reference and an output connected to selected transistors for driving selected transistors and setting a PWM duty cycle for the selected arrays of light emitting diodes to determine the brightness of selected light emitting diodes. An oscillator is connected to the PWM controller for driving the PWM controller.
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