Planar illumination apparatus with scattering unit by rayleigh scattering

摘要

A planar illumination apparatus according to an embodiment includes a light source and a light guide plate. The light source includes a light emitting diode and a wavelength conversion material that is excited by light emitted from the light emitting diode so as to emit light, and emits white light. The light guide plate includes an incident end surface on which the light source is disposed, and an emission surface that emits light incident from the incident end surface. The light guide plate is provided with a light scattering unit on at least one of the emission surface and a rear surface opposed to the emission surface. The light scattering unit mainly scatters light emitted from the light emitting diode than light emitted from the wavelength conversion material.