A TV wall system includes a video source and at least a row of display devices. The video source is used for providing a video signal. The at least one row of display devices is coupled to the video source. The at least one row of display devices includes a plurality of display devices coupled to each other in a cascaded manner. Each of the display devices includes a positioning module, a sensing unit, and a display control unit. The positioning module is used for generating a positioning signal. The sensing unit is coupled to the positioning module for sensing the positioning signal generated by the positioning module. The display control unit is used for controlling the display device to display images according to the video signal and the positioning signal sensed by the sensing unit.