Patent ID: 7688402

Claim:
A backlight module, comprising: a light box, having an opening and a plurality of substantially parallel grooves recessed from a bottom surface thereof, wherein each of the grooves includes a reflective curved surface and a light source allocation line is defined over the interface of every two adjacent grooves and parallel to the pair of adjacent grooves, and a sum of shortest distances between any point of each reflective curved surface and the light source allocation lines at two sides thereof is substantially the same; and a plurality of real light sources disposed on every other light source allocation lines, wherein a part of light emitted from each of the real light sources is reflected by the reflective curved surface to the light source allocations on which the real light sources are not disposed, so as to form a plurality of virtual light sources alternately arranged with the real light sources, wherein the reflective curved surface of each groove is substantially a portion of an ellipse, and the light allocation lines are substantially allocated on focal points of the respective ellipses, and wherein adjacent ellipses share a common focal point.