| 摘要 |
PROBLEM TO BE SOLVED: To provide a light guide plate capable of reducing an area where brightness is insufficient.SOLUTION: A plurality of convex sections 41 extended in a first direction and arranged side by side in a second direction are formed on end faces S3, S3where light is incident, and grooves 44 extended in the first direction are formed each between the adjacent convex sections 41. A contour shape of the groove satisfies the expression (1), when a distance in a third direction between the deepest point C of the groove 44 and a bent point B on an outside of each convex section 41 is denoted by H, a distance between the bent points B of any adjacent convex sections 41 is denoted by P, a distance between the bent points B of one convex section 41 is denoted by F, an axis line passing the bent point B and parallel to the second direction is defined as an x-axis, and an axis line passing the deepest point C and parallel to the third direction is defined as a y-axis. |
