SURFACE LIGHT SOURCE DEVICE AND DISPLAY APPARATUS USING SAME

摘要

A surface light source device includes a light source, a plurality of light guide rods that are disposed in parallel and allow light emitted from the light source to enter through an end surface and emits the incident light through an outer peripheral surface, and a diffusion plate that transmits light emitted from the light guide rod while diffusing the light. The light guide rod includes a light control part disposed on a surface along an axis of the light guide rod, and scattering, reflecting, or emitting light guided inside the light guide rod. Further, when an angle of a direction of a perpendicular relative to an extending direction of the diffusion plate from the center of the light guide rod is set as 0°, an angle of light having peak intensity to be emitted from the light guide rod is 30° to 90°.

主权项

1. A surface light source device comprising:
a light source; a light guide rod that allows light emitted from the light source to enter through an end surface of the light guide rod and emits the incident light through an outer peripheral surface of the light guide rod; and a diffusion plate that transmits light emitted from the light guide rod while diffusing the light, wherein: the light guide rod includes a light control part that is disposed on a surface along an axis of the light guide rod, and carries out at least one of inwardly reflecting a part of light guided inside the light guide rod while scattering the part of the light, and outwardly emitting a part of light guided inside the light guide rod while scattering the part of the light, and in a cross section orthogonal to the axis of the light guide rod, an angle of light having peak intensity to be emitted from the light guide rod is 30° to 90° when an angle of a direction of a perpendicular relative to an extending direction of the diffusion plate from a center of the light guide rod is set as 0°.