A light source module including a first backlight module, a second backlight module, a turning film, and a first absorptive polarizer film is provided. The first backlight module has a first side and a second side. The first backlight module includes a first light guide plate (LGP) having a first light incident surface and a first light source disposed beside the first light incident surface. The second backlight module is arranged at the second side. The second backlight module includes a second LGP having a second light incident surface and a second light source disposed beside the second light incident surface. The turning film is arranged at the first side. The turning film includes a plurality of reverse prisms. The reverse prisms extend along an extension direction. The first absorptive polarizer film is disposed between the first backlight module and the second backlight module. A display device is also provided.