| 摘要 |
PROBLEM TO BE SOLVED: To provide a light guide plate capable of controlling a diffusion angle of outgoing light and having an enhanced degree of freedom of light control.SOLUTION: A light guide plate (10) emits light from a light emission surface while permitting light from a light source (29) to enter therein and guiding the light in a light guide direction. The light guide plate (10) has a base part (11) having light transmissivity, and has, on one surface of the base part, a diffraction structure layer (12) with a diffraction structure pattern having concave portions and convex portions formed thereon. The diffraction structure pattern is the structure that these concave and convex portions are alternately repeated. The diffraction structure layer includes two or more kinds of diffraction structure patterns having different structures. |
