Patent ID: 8192067
Filing Date: 2012-06-05
Classification: G02B

Abstract:
1. A backlight unit comprising: a light source for emitting light; a light guiding member having a front face, a rear face, and an end face, the light guiding member receiving the light emitted from the light source at the end face and propagating the received light in a first direction; a prism sheet disposed at the front face side of the light guiding member; and a reflection section disposed at the rear face side of the light guiding member, wherein, the reflection section has a reflection surface for reflecting light being emitted from the rear face of the light guiding member and having a component in the first direction, the light being reflected toward the rear face of the light guiding member as light having a component in a second direction, the second direction being an opposite direction to the first direction; the light guiding member emits the light having the component in the first direction and the light having the component in the second direction from the front face toward the prism sheet; wherein the rear face of the light guiding member and a front face of the reflection section both have sawtooth shaped surfaces that oppose each other; and wherein a pitch of apices of the sawtooth shaped surface of the rear surface of the light guiding member is approximately equal to a pitch of the front face of the reflection section.