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Transition of Backlight Control Methods
The concept of ABC lies in automating user operations. However, automatic control depends on the
illumination sensor. It cannot be perfect because various types of light, sunlight or room light for
example, may be incident to the sensor. Consequently, this requires manual ON/OFF control even if
under ABC control. This leads to a further problem wherein the user may forget to turn it on or off.
To avoid these problems this system employs the following rules for transition between ABC,
manual operation (ON function/OFF function), and ABO.
Fig. 5.6
ABC Control
ONOFF
OFF function
or ABO time
OFF function
ABC ON
ABC OFF
ON function
ABO time or
OFF function