The protective film can be divided into: digital product protective film, car protective film, household protective film, food preservation protective film etc. However, with the popularity of cell phones and other digital products in China, protective film has gradually been unified. As for the term 'screen protector', it consists of a variety of functions in the field of screen protectors, evolved from the earliest HD anti-scratch to the current OK8 functional protective film, and also from the earliest PP material to the popular AR material. The protective film has been gradually accepted by the public after more than 5 years of development.