A display module is disclosed. The display module includes a display panel and a liquid crystal lens. The liquid crystal lens includes a liquid crystal layer; the liquid crystal lens is on a display side of the display panel and configured to gather, in a horizontal direction, light rays exiting from the display panel together to at least one observation position, which includes a primary observation position corresponding to a center of the display panel and subsidiary observation positions on both sides of the primary observation position. Also disclosed are a display device including the display module and a control method for the display module.