| 摘要 |
Light guide plate 4 is provided with an emission-directivity-giving-means (such as projection rows on a back face) to modify directivity of emission from emission face 10 . L light control member 11 disposed on emission face 10 is provided with a plurality of prismatic projection rows 15 running in a direction inclined anticlockwise (or clockwise). Each of incidence control portions 12 formed on incidence face 5 has an asymmetric configuration providing first and second side face (convex face) 13, 14 different from each other in curvature. Light emitted by LED 6 enters into light guide plate 4 through each incidence control portion 12 , generating inner propagation light which spreads like a sector having a center axis inclined clockwise (or anticlockwise). The first and second side faces may have other configurations such as "concave faces different from each other in curvature", "flat slopes different from each other in inclination" or "flat face and curved face".
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