Brightness adjustable keyboard illuminating module of electronic device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
May 21, 2009
app pub date -
Nov 20, 2007
filing date -
Nov 20, 2007
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A brightness adjustable keyboard illuminating module of an electronic device includes a controlling unit, a voltage regulating unit, and a projection lamp unit. The controlling unit is used for receiving a brightness adjusting command to generate a pulse width modulation (PWM) signal according to the brightness adjusting command. The voltage regulating unit receives the PWM signal and regulates a voltage of an output driving signal according to a duty cycle of the PWM signal. The projection lamp unit receives the driving signal and projects light in response to the voltage of an output driving signal, to the keyboard of the electronic device.
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