| 摘要 |
PROBLEM TO BE SOLVED: To provide a light guide plate unit with improved luminance in a front direction as well as a planar light source device and a transmission image display device including the light guide plate unit, and to provide the light guide plate.SOLUTION: The light guide plate unit 55 is provided with a prism plate 40 equipped with a surface 40a with prism parts 41 extended in one direction arranged in parallel, and a light guide plate 50 equipped with an emission face 51a opposed to the surface 40a, a rear face 51b having convex parts 52 extended in an extension direction of the prism parts 41 arrayed in parallel, and incident faces 51c, 51d. |
