| 摘要 |
A planar illumination device (100) is provided with a plurality of light sources (2) provided on a same plane, a light guide plate (5) having a plurality of accommodating holes (50) accommodating the light sources (2) separately, and a diffusion plate (6) provided facing a light exit surface (5a) of the light guide plate (5). Each of the plurality of accommodating holes (50) has a shape corresponding to a shape of each of the plurality of light sources (2) such that a light flux angular density of the light transmitted through the internal surface of the accommodating hole, in an angular direction around the center of the light source (2) accommodated in the accommodating hole (50) as viewed from a direction orthogonal to the plane, increases toward each vertex of a unit section that surrounds the light source (2) in the light guide plate (5).
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