This standard specifies the requirements, test methods, inspection rules, marking, Encasement, transportation and storage of prism brightening films covered with protective film. The scope of application includes prism brightening films with microprism structure formed from polyethylene terephthalate (PET) film as the substrate, mainly used in the flat panel display industry. The document refers to multiple normative reference documents, and the terms and definitions follow the GB/T 33376 standard. Among them, the brightening film is defined as the PET film as the substrate, by UV light curing glue formed by Optical inspection functional film with microprism structure.