MATERIAL FOR CONTROLLING LUMINOUS FLUX, LIGHT EMITTING DEVICE AND DISPLAY DEVICE

摘要

A material for controlling luminous flux according to an embodiment of the present invention includes an incident surface which includes a convex part for connecting a center and an edge with a curved line, a concave part which is separated from the incident surface in a light axis direction and is dented toward the incident surface, a first optical surface which includes a flat part extended from the edge of the concave part, and a second optical surface which forms the lateral surface of the material for controlling luminous flux and forms the flat part and the edge. The diameter gradually decreases to the first optical surface.