Portable computer system and controlling method thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Nov 8, 2005
Grant Date -
Jan 23, 2003
app pub date -
Feb 21, 2002
filing date -
Jul 23, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A portable computer system comprises a main body and an LCD apparatus having an LCD panel and a back light for illuminating the LCD panel. The system further comprises: a DC/AC inverter for supplying AC power to the back light; a contrast sensing part for sensing contrast of a video signal displayed on the LCD panel; a DC converter for converting a PWM signal outputted from the contrast sensing part into a DC signal; a voltage controller causing the DC signal from the DC converter to be appropriate for an operating voltage of the DC/AC inverter so as to supply the operating voltage to the DC/AC inverter; and a controller for sensing the operating voltage of the DC/AC inverter, and for controlling the voltage controller on the basis of the operating voltage. With this configuration, the brightness of a back light can be automatically controlled according to a contrast sensed by a contrast sensing part regardless of the input impedance of the inverter.
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