| 摘要 |
A light guide plate is provided which is high in light use efficiency, and is capable of emitting light with reduced luminance unevenness and obtaining a convex distribution. The light guide plate includes two or more layers which change in thickness in a direction substantially perpendicular to a light exit surface. A combined particle concentration changes so as to have a first local maximum value on a side closer to each of one or more light incidence surfaces and a second local maximum value which is larger than the first local maximum value. Each of the one or more light incidence surfaces is a roughened surface obtained by forming a cut and polished surface having a given periodic structure in a direction parallel to a longitudinal direction of each of the one or more light incidence surfaces. |
