LIGHT GUIDE PLATE, AND DEVICE USING LIGHT GUIDE PLATE

摘要

[Problem] To provide a light guide plate that can be used with a light source having a wide light emission angle distribution, and for which manufacturing cost and light amount loss accompanying wavelength selection are low. [Solution] A light guide plate (100) having a configuration in which a plurality of diffraction gratings (107-112) formed by irregularities in a transparent substrate (101) are discretely provided along the light-guide direction on the top surface (1011) and bottom surface (1012) of the transparent substrate (101).