To make a conventional area grayscale display technique applicable to a
driving method that is designed to write data in a vertical blanking
interval. A display panel with multiple pixels and a display controller
that receives an input video signal and a sync signal and gets an image
presented on the display panel are provided. If one horizontal scanning
period and one vertical scanning period of the input video signal are
represented by 1H and V-Total, respectively, the display controller is
able to form one vertical scanning period V-Total of a first period in
which one horizontal scanning period of the display panel is 1Ho, which
is as long as 1H, and a second period in which one horizontal scanning
period of the display panel is 1Hn, which is not as long as 1H.