| 摘要 |
A light-emitting device (10) is arranged such that (x) R 1 monotonically decreasing as ± 1 increases, at least in a range of ± 1 < À/3, where an intersection of a light axis Z and an emission surface of a light-emitting element (1) is a reference point; ± 1 is an angle between the light axis Z and a straight line that passes through the reference point and an arbitrary point on a light-incoming surface (2a), and R 1 is a distance between the reference point and the arbitrary point on the light-incoming surface (2a); (y) R 2 monotonically increasing as ± 2 increases, at least in a range of ± 2 < À/3, where ± 2 is an angle between the light axis Z and a straight line that passes through the reference point and an arbitrary point on a light-outgoing surface (2b), and R 2 is a distance between the reference point and the arbitrary point on the light-outgoing surface(2b); and (z) A 2 scatters light without generating uneven brightness on a liquid crystal display panel and has higher scattering ability that is obtained by decreasing a reflectance caused by the Fresnel reflection, where n is a refraction index of a material forming a light flux controlling member (2), and A 2 = ”R 2/ (R 2 ”± 2 ), where ”R 2 is an increment of R 2 and ”± 2 is an increment of ± 2 . |
