From the appearance, DBEF belongs to brightness enhancement film, which is usually on the top layer and looks very bright. If reflected, it will obviously brighten. However, the diffuser is generally in the middle and lower layers, with the upper surface blurred and the lower surface smooth; If touched by hand, the diffuser has a slightly rough graininess, and the thickness is generally 0. 1~0.2, while the surface of DBEF does not have this feeling, and the thickness is generally thick, about 0.3.
Functionally, DBEF is a brightness enhancement film, which greatly improves the brightness in the field of vision and is expensive; The main function of diffusion sheet is to make the light distribution uniform. On the other hand, it can effectively cover the printing dots of the light guide plate when used on the light guide plate.