Abstract: A backlight module, a displaying module and a displaying device are provided by the present application. The backlight module includes: a back panel, wherein the back panel includes a bottom panel and a plurality of side panels that are connected to an edge of the bottom panel and are bent toward one side, and the plurality of side panels cooperate with the bottom panel to enclose an assembling space; a light emitting baseboard, wherein the light emitting baseboard is located inside the assembling space and fixed on the bottom panel, the light emitting baseboard includes a substrate fixedly connected to the bottom panel and a light emitting unit located at one side of the substrate away from the bottom panel, the substrate is divided into a functional region and an edge region surrounding the functional region, and the light emitting unit is located within the functional region.