| 摘要 |
PROBLEM TO BE SOLVED: To project light from a light source with equal energy at an arbitrary distance corresponding to a ridge and to thus obtain light projection light which has no luminance spot almost vertically as projection light from a final planar illuminator. SOLUTION: A light guide plate 1 has an incident part P on which the light from the light source is made incident at the center position P1 or one end part position P2 of at least one side face part 4 and projected or recessed ridges 51, 61, 52, and 62 are formed at the top surface part 5 and reverse-surface part 5 concentrically with those positions. A light polarizing sheet 10 in an arcuate prism shape having projecting or recessed ridges 10a and 10b symmetrically with the ridges 51, 61, 52, and 62 of the light guide plate 1 is arranged on the light guide plate 1. |
