| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical path control diffusion sheet capable of coping with a peak characteristic of an outgoing ray of a light guide plate and with a peak characteristic of an incident ray suitable for a prism sheet, and capable of directing right upward the peak direction of a ray emitted from the prism sheet, and a back light unit. SOLUTION: This sheet is equipped with a light diffusion means for diffusing a ray entering from the lower face side, and for emitting the ray to the upper face side, and with an optical path control means for refracting a peak angle of the ray entering from the lower face side to an optional direction, and for emitting the ray to the upper face side. As the optical path control means, prism parts 3 having triangular projection-shaped sections, formed in parallel in great numbers on a sheet face, or quadrangular pyramid-shaped prism parts formed in great numbers on the sheet face are preferably installed. |
