A side type backlight module including a first light guide plate (LGP), a plurality of second LGPs, a plurality of red point light sources, a plurality of green point light sources, and a plurality of blue point light sources is provided. The first LGP has a first light emitting surface, a bottom surface, and a first light incident surface connecting the first light exit surface and the bottom surface. The second LGPs are disposed beside the first light incident surface. Further, a plurality of red, green, and blue point light sources is respectively disposed beside the second LGPs. The lights emitted by the red point light sources, the green point light sources, and the blue point light sources are blended to be a white light by each of the second LGPs and then incident to the first light incident surface.