The diffusion film is semi-transparent with a matte surface and has a light diffusion function. It is a film material that can promote the uniformity of the brightness of the light. Mainly used in LCD backlight module, flat lighting and other fields. The light passing through the diffusion layer with PET as the base material will pass through the medium with different refractive index, causing many phenomena of refraction, reflection and scattering of the light, which can correct the light into a uniform surface light source to achieve the effect of optical diffusion.
In the backlight structure, it mainly plays the role of correcting the diffusion angle and covering the defects of the LGP, which will increase the light radiation area. The luminous light source can become a secondary light source with larger area, better uniformity and more stable chromaticity after passing through the diffusion film material.