The device has an LCD panel 6, a digital circuit 1 and an analog circuit 2
which generate display signals to be supplied to the LCD panel 6, and has
functions of normal mode and stand-by mode in a status where electric
power is supplied from a power source 5. In the normal mode, a multivalued
display signal which can represent gradation levels is generated and
supplied to the LCD panel 6, while in the stand-by mode, a binary display
signal which does not represent gradation levels is generated and supplied
to the LCD panel 6.
