System on a chip with backlight controller
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United States of America Patent
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N/A
Issued Date -
May 1, 2008
app pub date -
May 1, 2007
filing date -
Oct 31, 2006
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A backlight control module includes a gain module, a variable voltage reference, a comparator, and a pulse width modulator. The gain module is coupled to amplify a representation of LED current to produce an amplified current sense signal. The variable voltage reference source is coupled to produce a reference voltage based on the backlight setting to produce a representation of the backlight setting. The comparator is coupled to compare the reference voltage with the amplified current sense signal to produce the comparison signal. The pulse width modulator is coupled to produce a pulse width modulated (PWM) signal as the brightness control signal based on the comparison signal, wherein the brightness control signal is provided to an off-chip variable supply voltage source that provides power to the off-chip LED.
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