| 摘要 |
A backlight module includes a light source and a light scattering plate. The light scattering plate includes a light incident surface and a light output surface, the light incident surface facing the light source, and the light output surface defining a number of netted dots for scattering light. A distribution of the netted dots meets formulas of rk=akb and thetak=2piphi-2, wherein k is an ordinal number of one netted dot, rk is a distance between the k netted dot and the a center of the light source, and thetak is an angle of the k netted dot relative to a center of the light source, a>0, b>0 and &phis; = 1 + 5 2 . |
