In recent years, optical grade PET polyester film has been widely used. Especially in the manufacturing process of LCD screens, PET optical films are indispensable materials, such as diffusion films, brightness enhancement films, anti-glare films, etc. In fact, this depends on the characteristics of PET optical film - high transmittance, low haze, high brightness, no yellowing, good adhesion, good flatness, no light and dark lines, high temperature resistance and ultraviolet radiation resistance, good stiffness, Resistant to burning cracks, not easy to break, etc.
Functional PET optical film is mainly obtained by coating various functional coatings on the surface of PET polyester film.
According to the function of the coating, the coating can be divided into three categories, namely protective coating, decorative coating and functional coating. By coating different coatings on PET polyester film, films with different functions can be produced.
For example, the surface of PET polyester film is coated with an anti-scratch and antistatic (106~108Ω) coating to make a screen PET protective film, which is used to protect the surface of mobile phone or computer screens.
Coating a coating containing optical particles or glass beads on the PET polyester film can be used to make an optical diffusion film, which can be used in the LCD panel backlight module to effectively eliminate the interlacing of light and dark or dot phenomena, improve the brightness of light, and provide LCD The panel provides a uniform surface light source.
An anti-glare film can be made by coating the surface of the PET polyester film with a resin system with particle components, which can be used in a liquid crystal display. It uses the scattering of reflected light and the internal reflection caused by the difference in refractive index between the hard-coated resin and the particles. Scattering to prevent screen smearing, etc.
Optical films can generally be divided into reflective films, anti-reflection films/anti-reflection films, polarizers/polarizing films, beam splitting films, etc. Nowadays, with the continuous development of optical films, optical films can be summarized and classified according to their properties - regulating light intensity, regulating spectral distribution, regulating polarization characteristics, regulating dispersion characteristics, etc. In this way, you can break out of the original thinking mode and choose the type of film you need based on the conventional classification of films. Instead, you can choose optical films with different properties from the perspective of their required applications, and re-understand optical films from a new perspective. Application problems caused by optical films.