| 摘要 |
PROBLEM TO BE SOLVED: To make a bright line inconspicuous generating in an outward oblique direction seen from a light source.SOLUTION: A light guide plate 33 includes: a wedge-shaped light introduction part 34; and a light guide plate body 35 which is thinner than a maximum thickness of the light introduction part 34, and which is provided so as to continue to the light introduction part 34. At the light introduction part 34, an inclined surface 36 is formed which is inclined toward the light guide plate body 35 from a point of the maximum thickness. At the inclined surface 36, a directional conversion pattern 37 is formed in which a V-groove shaped pattern element 38 is arranged. Furthermore, in a region from the middle of the light introduction part 34 to an end part of the light guide plate body 35, a slit-shaped beam reflection part 44 extending in the direction vertical to a light incident end surface 39 is provided. |
