| 摘要 |
[PROBLEMS]To provide a light control element capable of performing deflection control on light exiting a light guide plate at a desired exit viewing angle.[MEANS FOR SOLVING PROBLEMS]The light control element (prism sheet) (11) has one surface, i.e. an incident surface, and the other surface, i.e. an exit surface, wherein the incident surface is formed by arranging a large number of prism portions (11P) in parallel. Each prism portion (11P) has a first prim surface (11a) on which light impinges, and a second prim surface (11b) for totally reflecting the light incident to the first prim surface (11a) off the inner surface side. The second prim surface (11b) has a curved surface shape projecting outward, and its curvature is formed with a size to provide a second exit viewing angle wider than a first exit viewing angle when the second prim surface is a flat surface. |
