Patent ID: 7670041

Claim:
A backlight module, comprising: a light source defining a plurality of light units configured for emitting light beams; and a light guide plate structured and arranged for transmitting the light beams, comprising: a light incident surface configured for receiving the light beams; an emission surface adjacent to the light incident surface, the emission surface being configured for emitting the light beams; a bottom surface opposite to the emission surface; a plurality of side surfaces connectively arranged between the emission surface and the bottom surface; and a plurality of diffusion units formed on the bottom surface, the diffusion units being structured and arranged for scattering the light beams; wherein a size of each diffusion unit is inversely proportional to a summation of a sum of reciprocals of squares of distances between the diffusion unit and each light unit and a sum of reciprocals of squares of distances between the diffusion unit and corresponding images of each light unit formed, respectively, by the side surfaces.