Patent ID: 9028125
Filing Date: 2015-05-12
Classification: G02B

Abstract:
1. A light guide plate comprising: an incident surface on which light is incident; an outgoing surface from which light incident on the incident surface is outputted; a reflection-and-propagation surface at which the light incident on the incident surface is reflected so as to propagate toward the outgoing surface, the reflection-and-propagation surface opposing the outgoing surface; a plurality of prism grooves formed in the reflection-and-propagation surface and extending parallel to the incident surface; a flat surface portion formed in a region extending an entire length of the outgoing surface adjacent to the incident surface, the flat surface portion having no prism protrusions; a propagation auxiliary region of the outgoing surface adjacent to the flat surface portion, a plurality of inclined prism protrusions extending orthogonal to the incident surface and a plurality of planar portions being formed alternately in a direction parallel to the incident surface, respectively, the prism protrusions being spaced apart from the incident surface by a constant distance; a first prism portion of the outgoing surface adjacent to the propagation auxiliary region, a plurality of inclined prism protrusions extending orthogonal to the incident surface and a plurality of planar portions being formed alternately in a direction parallel to the incident surface, respectively; and a second prism portion of the outgoing surface not adjacent to the propagation auxiliary region but adjacent to the first prism portion, a plurality of prism protrusions with a constant height extending orthogonal to the incident surface being formed in the second prism portion with no planar portions formed therein.