Backlight module and display device

A backlight module, comprising:

• an optical film, wherein the optical film is a light-guiding film and comprises:
• a main body having a light-emitting surface, an optical surface, a first side surface and a second side surface, wherein the light-emitting surface is opposite to the optical surface, and the first side surface and the second side surface are respectively connected to two opposite sides of the optical surface;
• and
• a plurality of optical structures disposed in a first area of the optical surface, wherein a light beam is guided by the optical structures to emit out from the light-emitting surface, wherein each of the optical structures has:
• a first surface inclined relative to the optical surface, wherein a first angle is formed between the first surface and the optical surface, and wherein the first surface is a light-receiving surface which is first contacted by the light beam entering the optical film;
• and
• a second surface connected to the first surface, wherein the second surface is inclined relative to the optical surface, and a second angle is formed between the second surface and the optical surface;
• wherein the first angles of the optical structures and the second angles of the optical structures are acute angles, and the first angles of the optical structures vary along a first direction from the first side surface to the second side surface;
• the first area extends from the first side surface to the second side surface;
• the first angles of the optical structures located in the first area become greater along the first direction;
• a light source disposed adjacent to the first side surface of the optical film;
• and
• a turning film disposed on the optical film;
• wherein the turning film faces towards the light guide film and has a plurality of prism structures with a length direction;
• wherein a length direction of each of the plurality of optical structures is parallel to the length direction of each of the plurality of prism structures;
• and
• wherein at a location closer to the first side surface, the light beam is deflected in a direction opposite to the first direction, and at a position closer to the second side surface, the light beam is deflected in a direction, which is the same as the first direction.