The invention provides a display module and a display device. The display module comprises an upper polarizer, a liquid crystal box, a lower polarizer, an optical incremental film layer and a light guide plate. The first lateral edge of the light guide plate is provided with a lamp strip and a liquid crystal drive circuit. The light guide plate is a glass light-conducting plate. The display module also comprises a back plate and first sealant, wherein the back plate is disposed on the surface of the light guide plate opposite to the optical incremental film layer, the first sealant is located on other three lateral edges of the light guide plate except for the first lateral edge and used for fixing and sealing the upper polarizer, the back plate and spacing between the upper polarizer and the back plate. The self-thickness of the display module provided by the invention may be reduced at the premise of ensuring strength, thus enabling thinning of the display module.