Patent ID: 8926160
Filing Date: 2015-01-06
Classification: G02B,G02F

Abstract:
1. A light guide plate comprising: a rectangular light exit surface; at least one light incidence surface which is provided on at least one 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 from said light exit surface; and scattering particles dispersed in said light guide plate, wherein said scattering particles are polydisperse particles including a mixture of particles with different particle sizes, wherein said light guide plate includes 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 said two or more layers include at least, a first layer disposed on a side closer to said light exit surface and having a particle concentration Npo and a second layer disposed on a side closer to said rear surface than said first layer and having a particle concentration Npr, and Npo and Npr satisfy a relationship expressed by Npo<Npr, wherein a cross section in a direction perpendicular to said at least one light incidence surface extending from said at least one light incidence surface toward a central portion of said light exit surface has a concave shape toward a light exit surface side, and wherein a combined particle concentration in each portion of said light guide plate is changed by changing a thickness of said first layer and a thickness of said second layer in the direction substantially perpendicular to said light exit surface.