A display module, a display system, a control method for the display system are provided. The display module includes: a backlight module including an optical film; two display panels on a light exiting side of the optical film, where the two display panels are adjacent to each other and are spliced, orthographic projections of the two display panels onto a plane where the optical film is located are within the optical film, and the orthographic projections of the two display panels onto the plane where the optical film is located do not overlap; and a transparent cover plate on light exiting sides of the display panels, where an ink layer is arranged on a side of the transparent cover plate facing the backlight module, and the ink layer covers a region between two adjacent display panels.