Display device and light diffusion optical film thereof

An optical film for light diffusion, comprising:

• a first substrate;
• a core layer formed on the first substrate and configured to optically affect a light beam incident into the optical film, wherein the core layer comprises a mounting surface adjacent to the first substrate, and a first direction and a second direction mutually intersecting are defined on the mounting surface;
• and
• a light diffusion structure formed on the mounting surface and configured to diffuse the light beam;
• wherein the light diffusion structure comprises a micro-structured layer being a union of a plurality micro-structural bodies extending along the first direction and the second direction, each of the micro-structural bodies comprises a first surface and a second surface opposite to the first surface, the first surface intersects the mounting surface at a first boundary, the second surface intersects the mounting surface at a second boundary, the first surface intersects the second surface at a connection, the first boundary is a line or a first curve, the second boundary is a line or a second curve, the connection is a ridge or a rounded surface, and the ridge is a line or a third curve.