The diffusion film is a component of the LCD backlight module, which mainly diffuses the light of the light guide plate, and can distribute the line light source (CCFL) or point light source (LED) into a uniform surface light source.
Generally LCD needs 2 diffuser films, 1 upper diffuser film and 1 lower diffuser film. Because the lower diffuser film is close to the light guide plate, the light transmittance is high and the degree of scattering is not high. The upper diffuser film requires a higher degree of diffusion and the upper diffuser The film also has the functions of eliminating the pattern of the prism sheet and protecting the prism sheet. The upper and lower two diffusion films scatter the light and achieve the effect of uniform light diffusion.