| 摘要 |
The present invention is directed to a surface light source device utilizing a light pipe. The present invention is also directed to a backlight unit and a liquid crystal display which are provided with such surface light source device. A surface light source device comprises at least one light source generating light; and at least one hollow light pipe, the light pipe includes a first light waveguide unit with structured surface on at least one side; and, a second light waveguide unit with structured surface on at least one side and disposed substantially parallel to the first light waveguide unit, wherein a longitudinal direction of the structured surface of the first light waveguide unit and a longitudinal direction of the structured surface of the second light waveguide unit form a certain angle.
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