Backlight module, display device comprising thereof and manufacturing method for light guiding plate

The present invention relates to a backlight module, a display comprising thereof and a manufacturing method for a light guiding plate. The backlight module comprising: a shell; a light guiding plate disposed on the shell, which comprises a light entrance surface, a bottom surface, and a light output surface; and a light source disposed on the light entrance of the light guiding surface. Any horizontal cross section of the light output surface of the light guiding plate has a first curve, and a longitudinal cross section of the light output surface of the light guiding plate through any peak of one of the first curve has a second curve, wherein the distances between the adjacent peaks of the first curve are the same, the adjacent troughs of the first curve has a plurality first distance, any two adjacent first distances are different from each other, the adjacent peaks of the second curve has a plurality of second distance, and any two of the adjacent second distances are different from each other.