DIRECT-TYPE BACKLIGHT MODULE

A direct-type backlight module comprises a substrate, a light-emitting module, a transparent support layer and an optical structural film arranged in sequence. The light-emitting module has a plurality of light-emitting elements arranged on the substrate, and the distance between two adjacent light-emitting elements is between 4 mm and 16 mm. The optical structural film has a transparent structural layer disposed on one of the two opposite surfaces of a transparent substrate layer. The transparent structural layer forms a plurality of pyramid structures arranged in an array in a concave or convex manner towards the direction of the light-emitting module, and the distance between two adjacent pyramid structures is less than 0.08 mm. The arrangement between these pyramid structures is closer than the arrangement between these light-emitting elements, thereby allowing one point light source emitted by the light-emitting element to form multiple point light sources for emission.