Patent ID: 9075176
Filing Date: 2015-07-07
Classification: G02B

Abstract:
1. A light guide plate comprising: a rectangular light exit surface; a first light incidence surface which is provided on a first end side of said light exit surface and through which light traveling in a direction substantially parallel to said light exit surface enters; a rear surface on an opposite side to said light exit surface; scattering particles dispersed in said light guide plate; a second light incidence surface which is provided on a second end side orthogonal to the first end side on which said first light incidence surface is provided and through which light traveling in the direction substantially parallel to said light exit surface enters; and two or more layers superposed on each other in a direction substantially perpendicular to said light exit surface and containing said scattering particles at different particle concentrations, wherein thicknesses of said two or more layers in the direction perpendicular to said light exit surface change so that a combined particle concentration of said light guide plate has, in a direction substantially perpendicular to said first light incidence surface, a first local maximum value located on a side closer to said first light incidence surface and a second local maximum value located at a position farther from said first light incidence surface than a position of said first local maximum value and being larger than said first local maximum value, and wherein the thicknesses of said two or more layers in the direction perpendicular to said light exit surface change so that the combined particle concentration of said light guide plate has, in a direction substantially perpendicular to said second light incidence surface, a first local maximum value located on a side closer to said second light incidence surface and a second local maximum value located at a position farther from said second light incidence surface than a position of said first local maximum value and being larger than said first local maximum value.