Backlight Module and Display Device

A backlight module, comprising:

• a light source, configured to provide a light source;
• a light guide plate, comprising a light guide incident surface facing the light source and a light guide emergent surface facing a light emitting direction;
• a peripheral edge of the light guide emergent surface being a refractive surface, and a distance from an outer edge of the refractive surface to the light guide incident surface being longer than a distance from an inner edge of the refractive surface to the light guide incident surface;
• a shielding area is formed on a position, close to the outer edge of the refractive surface, of the refractive surface to shield a ray, reflected and incident to the shielding area, from the light source;
• an inclination angle of the refractive surface in the shielding area is greater than a refraction critical angle of the light guide incident surface, and inclination angles of other areas than the shielding area on the refractive surface are equal to or smaller than the refraction critical angle of the light guide incident surface;
• and
• a diffusion film, comprising a diffusion incident surface and a diffusion emergent surface, a shape of the diffusion incident surface being fitted to a shape of the light guide emergent surface.