| 摘要 |
A surface light source device providing illumination for a liquid crystal display panel includes a plurality of light sources (51) for emitting light beams, and an LGP (52) for transmitting the light beams. The LGP includes a light incident surface (523) for receiving the light beams, an emission surface (521) adjacent to the light incident surface for emitting the light beams, a bottom surface (522) opposite to the emission surface, and a plurality of diffusion dots (56) formed on the bottom surface for scattering the light beams. An area of each diffusion dot is inversely proportional to the sum of squares of distances between the diffusion dot and each of the light sources. The systematically varying areas of the diffusion dots enable the surface light source device to provide highly uniform illumination.
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