Research this slices of their prepare and performance go on research to the diffusing film in a backlight module, it mainly research contents are the main body in order to utilize thermosetting type resin, the thermosetting resin is hitting to mix the particle with different size, become membrane with the mechanism of the coating after the resin is mixed and finished jointly, and then make the membrane harden with the oven hot wind. Test its optics result, then select suitable diffusion particle size, it go on coating make membrane with particle size distribution for main factor, collect all efficiency conduct to assess with the diffusion which examines the membrane of the amount of equipment examined of optics.