Patent ID: 8979351
Filing Date: 2015-03-17
Classification: G02B

Abstract:
1. A light guide plate has a first surface and a second surface opposite the first surface, receives light in a first direction parallel with the second surface, and emits the light towards the first surface in a third direction perpendicular to the first surface, the light guide plate comprising: a light receiving portion which receives the light; a light guiding path which guides, in the first direction, the light received by the light receiving portion; and an emitting portion which emits the light guided in the first direction by the light guiding path, by reflecting the light guided in the first direction by the light guiding path towards the first surface in the third direction, wherein: the emitting portion is a first V-shaped groove having a V-shaped cross-section and extending on the second surface in a second direction crossing the first direction, a plurality of first V-shaped grooves including the first V-shaped groove is provided in a center region of the light guide plate in the first direction and each of the plurality of first V-shaped grooves is formed to be deepest in a center in the second direction and become shallower as a distance from the center along the second direction increases, and a plurality of second V-shaped grooves is provided at outer sides of the plurality of first V-shaped grooves in the first direction, and each of the plurality of second V-shaped grooves is formed to have a constant depth and extend on the second surface in the second direction.