A vertical region designation circuit 141 outputs a vertical region designation
signal to a vertical driver 103 on the basis of vertical display position
information, a vertical synchronization signal and a horizontal synchronization
signal. A horizontal region designation circuit 142 outputs a horizontal
region designation signal to a horizontal driver 102 on the basis of horizontal
display position information, a pixel synchronization signal, a vertical synchronization
signal and a horizontal synchronization signal. The horizontal driver 102 outputs
an input picture signal to a picture display surface 101 from a signal line
at a horizontal coordinate corresponding to the number of times of pixel synchronization
signals that is counted from an input horizontal synchronization signal as a starting
point during a period when a horizontal region designation signal is effective.
A vertical driver 103 stores the number of times of synchronization of a
horizontal synchronization signal during a period when a vertical region designation
signal is effective, and the vertical driver 103 selects a signal line at
a vertical coordinate corresponding to the number of times of synchronization.
The picture display surface 101 displays a picture signal output from the
horizontal driver 102 at a position designated by a horizontal coordinate
corresponding to the signal line where the picture signal was output and a vertical
coordinate corresponding to the signal line selected by the vertical driver 103.
