| 摘要 |
PURPOSE: To reduce brightness irregularity in the vicinity of an incoming surface by preventing luminous points of point light sources from being seen from the outgoing surface side, in the case of a light plate, a sidelight surface light source device, and a liquid-crystal display device, using point light sources as primary light sources, in which, for example, light goes out from local luminous areas with relatively intense directivity. CONSTITUTION: A plurality of grooves 12D extending in the thickness direction are formed, at least, in portions of a light guide plate 12 confronting point light sources 7, and they are formed so that the cut depths of the grooves 12D are gradually decreased toward an outgoing surface 12C at least in the vicinity of the outgoing surface 12C.
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