| 摘要 |
PROBLEM TO BE SOLVED: To materialize a light guiding surface light source device with a curved surface having almost even luminance. SOLUTION: An area of a different refractive index is provided at a convex and concave bent part of a light guide plate. Light from a light source, thereby, can progress in a way refracted along the bent part of the light guide plate and a sufficient luminance as a surface light source is maintained even in an area remote from the light source. |
