Three types of diffuser films for mini-LED backlight are developed and their optical performances are examined. The proposed diffuser films are composed of a dielectric multilayer and microprisms and features alignment free. This paper explains a module evaluation using the diffuser film designed for mini-LED backlights. The diffuser film changes the light emitted from the LED and the light reflected by the dielectric multilayer. The dielectric multilayer function as an angle filter that does not transmit blue light directly above the LED and transmits blue light only with an angle of incidence above a certain degree. The microprisms divide and refract light emitted from LED light and multiplies the LED light laterally. This combination of dielectric multilayer and microprisms makes the illuminance distribution uniform without requiring alignment between the LED chips and the diffuser film. In this paper, we discuss the film constitution to further enhance the effects of the diffuser film. In particular, we will explain the module evaluation results when a microprisms are combined with the light-emitting side of the dielectric multilayer, as well as when it is laminated with a wavelength conversion film.