Diffusion film is one of the components of the backlight module, diffuser also called it diffusion film, the main function for the display to provide a uniform surface light source. Substrates need to select materials with high light transmittance such as PET / PC / PMMA. In general, the diffusion film is mainly composed of chemical particles in the diffusion film substrate, as the scattering particles, and the existing diffusion plate is scattered between the tree finger layers, so that when the light layer passes through the diffusion layer Will continue to re-two different refractive index through the medium, at the same time there will be a lot of light refraction, reflection and scattering phenomenon, thus causing the effect of optical diffusion.
The structure of the diffusion sheet is usually an antistatic coating layer, a PET substrate, and a diffusion layer from the bottom to the top.
The composition of the backlight module is from the bottom up to the reflective sheet, the light guide plate, the lower diffusion sheet, the prism sheet and the upper diffusion sheet The working principle of the diffusion sheet is to atomize the light source by the refraction and reflection of the diffusion material, The small angle of the light to focus on the front to improve the positive brightness.The lower diffusion film is mainly from the light guide plate issued by the light evenly projected onto the prism sheet, and the main role of the diffusion film is the prism film emitted light atomization The light evenly through the same time on the expansion can also play a role in protecting the prism sheet.