To provide a video display controller and video display device capable of reducing electric power consumption without requiring complicated hardware.

A decision section 6A of a control section 6 decides a region (off-video region) having no video signals out of a display screen of a plasma panel 10 based on the aspect ratio information 13A incidental to a video signal 11A etc., inputted from an antenna 8 or external signal input terminal 9 and additional information, such as reduced display signal 16 and a double window display signal 16 inputted by a user. The control section 6 selectively stops the light emission driving of the off-video region in a pixel unit or pixel group unit based on the results of the decision. The power consumption can be reduced, the black image quality of the off-video region is improved and a light and darkness ratio is improved. Since the off-video region is discriminated based on the additional information incidental to the video signal, the need for complicated circuits necessary for performing decision processing based on the luminance distribution etc., of the video signal is eliminated.