The present invention includes a panel on which a plurality of pixels are
located, a light-source for visualizing an image displayed on the
plurality of pixels, a controlling circuit for controlling the
light-source, and an image-signal tone characteristic controlling
circuit. Moreover, the light-source controlling circuit has a function of
repeating a period. Here, the period includes a 1st time-period during
which an electric current having a 1st intensity is fed to the
light-source, and a 2nd time-period during which an electric current
having a 2nd intensity differing from the 1st intensity is fed to the
light-source. The light-source controlling circuit controls the 1st
time-period and the 2nd time-period in accordance with display
information. Also, in accordance with the display information as well,
the tone characteristic controlling circuit is controlled so that the
excellent contrast will be always available.