What material is the optical film and why use?

Optical film is a kind of film that uses the principle of light interference and is coated on the surface of the carrier to change its optical properties. The most commonly used is the antireflection and antireflection film. The coating method generally uses vacuum evaporation (electron beam heating, etc.) to remove the film material. After evaporation, it condenses on the glass surface.

     First of all, I will explain to you the optical film. The optical base film is made of polyester chips (PET) through the process of dry casting and coating biaxial stretching. The optical film you are asking about Post-processing and composite production of brightness enhancement films (prisms), reflective films, diffusion films, and highly technically difficult polarizers and other composite films. The above are collectively referred to as optical films.

Secondly, the core technology of the current technology display panel is the composite of various optical films.

For reasons, PET has a stable structure and is not easy to deform and deteriorate, and has excellent optical properties, suitable for matching various coatings.

Why use optical film:

Mobile phone tablet computer monitors, including TVs, are all liquid crystal displays. The liquid crystal itself does not emit light, and a light source is needed on the back. OLED is a solution, but due to yield and cost reasons, the light source for large-size displays is still a backlight module. The backlight module uses various optical films to turn the point and line light sources of the LED lamp into a uniform surface light source (otherwise the brightness is uneven)

What material is the optical film:

The optical film in the backlight module is a material that uses resin and other materials to make some microstructures on the surface of the base film (PET) to make it have specific optical functions. Common structures include Prism sheet, reflector sheet, diffuser sheet, and light guide plate (this should be bancai), etc.