Multiple Video Wall Controller and NVIDA, AMD and other professional graphics cards can be cascaded to achieve 2x3, 3x3, 3x4, 4x5, MxN and other forms of expansion, always with the splicing of the large screen to maintain an equal proportion of the screen, the picture is not compressed, the field of view is more open, can be applied to large advertising walls, scheduling centres, exhibitions, conferences and activities, games, sports and other occasions. It can be applied to large advertising wall, dispatch centre, exhibition display, conference activities, game competition and other occasions.