Backlight modules and display device

A display device, comprising:

• a display panel;
• and
• a backlight module disposed on a backlight side of the display panel, wherein the backlight module comprises:
• a plate structure comprising a base plate and a side plate connected to the base plate, the base plate and the side plate surrounding an accommodating space, the base plate or the side plate comprising a first plate body provided with a plurality of first slots;
• an optical film disposed within the accommodating space;
• and
• a light-emitting assembly comprising a circuit board and a plurality of light-emitting elements electrically connected to the circuit board, each of the light-emitting elements being at least partially disposed in a respective one of the first slots, and a light-emitting surface of each of the light-emitting elements facing the optical film, and the circuit board being located on a side of the first plate body facing away from the optical films,
• wherein across-sectional shape of the first slot forms a shape similar to a horn, in which the cross-sectional shape of at least a part of the first slot is tapered along a direction pointing from the optical film to the light-emitting elements, and the cross-sectional shape of another part of the first slot remains unchanged, and
• wherein the side plate comprises the first plate body disposed on a side of the optical film along a first direction, the first direction intersecting a thickness direction of the optical film.