Optical film refers to a thin film deposited or coated on optical components using the principle of optical interference to alter the optical properties of the carrier. It is one or more layers of dielectric film or metal film, or a combination of these two types of films. Optical films can make light with different polarization planes have different characteristics by adjusting the transmittance and reflectivity of their surfaces in different wavelength bands. According to the different characteristics of optical films, they are mainly divided into brightening films, diffusion films, reflective films, composite films, filters, polarizers, etc.

The upstream of the optical film industry mainly consists of PET particles, which are usually stretched into base films, including PVA film, TAC film, PET base film, etc. The base film can be further processed using optical grade coating equipment, UV curing machines and other production equipment. The midstream segment mainly involves the manufacturing of LCD modules and backlight modules. The products mainly include optical film products such as polarizing films, brightening films, diffusion films, reflective films, photovoltaic backsheet films, and composite films. The downstream segment mainly includes optical display products such as LCD TVs, laptops, and mobile phones.