The present disclosure relates to the field of display technology, and provides a backlight module including a light guide plate, a diffusion assembly and a light source assembly. The light guide plate is provided with a hole thereon. The diffusion assembly is disposed over the light guide plate. The light source assembly has a light emitting portion. The light emitting portion is disposed within the hole, and includes a COB light source with an out-light surface facing towards the diffusion assembly and a LED light source with an out-light surface facing towards a hole wall of the hole. A transmittance at a position of the diffusion assembly opposite to the COB source light is smaller than a transmittance at a remaining position thereof.