| 摘要 |
PROBLEM TO BE SOLVED: To provide a light guide plate capable of achieving a backlight unit having high luminance without luminance unevenness and having high concealing properties of an LED light source.SOLUTION: A light guide plate includes: an incident surface in which light from an LED light source 6 enters a light guide plate 7; a light emission surface 13 where the light is emitted; and a light reflection surface 12 which is a surface facing the emission surface and in which the light which is not emitted from the light emission surface out of the light having entered the light guide plate is guided to the light emission surface. On the light emission surface, a plurality of microlens-like recess shapes are formed, and when a distance from an end part of the light guide plate on an LED light source side to a facing end part of the light guide plate is defined as x, depth of the microlens-like shape in a region where the distance from the end part of the light guide plate on the LED light source side is smaller than a product a×x of a and x is defined as d1, and the depth is defined as d2 in the region where the distance is larger than a×x, the relationship of 0.7≤a≤0.9 and d1<d2 is satisfied. |
