Patent ID: 9223074
Filing Date: 2015-12-29
Classification: G02B

Abstract:
1. A light guide plate comprising: an end surface configured to have light incident thereon; a light introduction part that confines light incident through the end surface; and a light guide plate body disposed to be continuously joined to the light introduction part, wherein the light guide plate body has a thickness smaller than a maximum thickness of the light introduction part, wherein the light guide plate body outputs the incident light to an outside from a lighting region through a light exit part, wherein the light introduction part includes an inclined surface in at least one of a light-exit-side surface and an opposite surface of the light-exit-side surface, wherein the inclined surface is inclined toward an end of the light guide plate body from a surface of a portion thicker than the light guide plate body, wherein the light guide plate body includes a directivity change pattern in a region located between the light introduction part and the lighting region in at least one of the light-exit-side surface and the opposite surface of the light-exit-side surface, wherein the directivity change pattern changes directivity of the light passing to the lighting region from the light introduction part, wherein at least part of a local minimum portion of the directivity change pattern is located inside the light guide plate body from a surface of the lighting region, wherein at least part of the local maximum portion of the directivity change pattern is located outside the surface of the lighting region, wherein in the directivity change pattern, a lighting-region-side end surface of a portion projected outward from the surface of the lighting region has an angle of 45° or less with respect to the surface of the lighting region, and wherein a portion located below the surface of the lighting region is inclined upwards toward the lighting region.