Prism film typically refers to a type of film or material that is used to disperse light. The film has the characteristics of enhancing light and improving brightness, it is a layer of optical thin film with uniform prism pattern is prepared by precise molding using acrylic resin, transparent film that has a series of small, angled ridges or grooves on its surface. 14 inches prism film is the regular size for Dell, Lenovo and HP laptop.