| 摘要 |
<p>A uniform luminance distribution and a high luminance of a surface light source in which a so-called point light source is used are realized. The direction of arrangement (longitudinal direction) of each of a plurality of diffusion pattern elements (24a) which constitute a diffusion pattern (24) on the lower surface of a light guide plate (22) is generally perpendicular to the direction from a point light source (30) to the diffusion pattern elements (24a). The density ς of the diffusion pattern elements (24a) is zero near the point light source (30), and increases linearly as the distance from the point light source (30) increases.</p> |
