PURPOSE: A light guide plate is provided to reduce power consumption of an electronic device and a portable device. CONSTITUTION: A light guide plate includes a plurality of protrusions(110). The protrusion includes a hemispheric body(112) and a beak unit(114). The beak faces the light source of the light guide plate. Light from the light source is concentrated by the hemispheric body of the light guide plate. The light is additionally concentrated by the beak unit.
