Optical film composite applicable in a direct type back light module

An optical film composite, comprising a light diffusion element, an intermediate member and a brightness enhancement element in sequence from a light incident surface, wherein:

• the light diffusion element comprises a substrate having light diffusion layers at both sides thereof, the light diffusion layer is a resin coating having a concave-convex microstructure, the resin coating contains particles and a binder, and the content of the particles is 280-400 wt %, based on the weight of the binder, and the light diffusion element has a haze of no less than 98% as measured according to JIS K7136 standard method;
• the intermediate member has a thickness in a range of 0.5 μm to 250 μm wherein the intermediate member is an optical adhesive, and the optical adhesive has a transmittance higher than 90% and a refractive index in a range of 1.4 to 1.6;
• and
• the brightness enhancement element is a light concentrating film, the light concentrating film comprises a substrate and an optical structure layer located on the substrate, and the optical structure layer comprises a plurality of arc columnar structures.