Patent ID: 8182131
Filing Date: 2012-05-22
Classification: G02B

Abstract:
1. A light guide plate comprising: a first light incident surface onto which a first external light is incident; a second light incident surface onto which a second external light is incident, the second light incident surface being opposite to the first light incident surface; a light exit surface that connects the first light incident surface to the second light incident surface to output the first and second external lights; a reflective surface configured to reflect the first and second external lights and positioned opposite to the light exit surface; and a plurality of optical path changing portions that are provided on the reflective surface at predetermined intervals and recessed toward the light exit surface to reflect the first and second external lights toward the light exit surface, wherein the optical path changing portions comprise: wherein the second ends of the first inclined surfaces are first distances from the light exit surface, wherein the second ends of the second inclined surfaces are second distances from the light exit surface, and wherein the first distances are smaller than the second distances in a first region between the first incident surface and a first reference line extending from a center of the light exit surface perpendicular to the light exit surface, and the second distances are smaller than the first distances in a second region between the first reference line and the second incident surface.