A display module and a display device are disclosed. The display module includes a display panel and a back panel. The back panel includes a first sub-panel disposed on a backside of the display panel, and the first sub-panel includes a plurality of first regions spaced apart and a second region adjacent to the first regions, wherein a thickness of the first sub-panel in the first regions is greater than 0 and less than a thickness of the first sub-panel in the second region.