Light guide plate

摘要

A large-sized thin light guide plate has a first layer on a light exit surface side and a second layer on a rear surface side containing scattering particles at a higher particle concentration than the first layer. Thicknesses of the layers in a direction substantially perpendicular to the light exit surface change to change a combined particle concentration. The scattering particles, obtained by mixing a particle group with an average particle size Ds of less than 7 μm having one or more local maximum values and a particle group with an average particle size Db of more than 7 μm having one or more local maximum values, satisfy 1 μm≦Ds<7 μm, 7 μm

主权项

1. A light guide plate comprising: a rectangular light exit surface; one or more light incidence surfaces which are provided on one or more end sides of the light exit surface and through which light traveling in a direction substantially parallel to the light exit surface enters; a rear surface on an opposite side to the light exit surface; and scattering particles dispersed in the light guide plate,
wherein the light guide plate includes two layers including a first layer disposed on a side closer to the light exit surface and a second layer that is disposed on a side closer to the rear surface and that contains the scattering particles at a higher particle concentration than the first layer, the first layer being superposed on the second layer in a direction perpendicular to the light exit surface, wherein thicknesses of the two layers in a direction substantially perpendicular to the light exit surface change in a direction perpendicular to each of the one or more light incidence surfaces to change a combined particle concentration, and wherein the scattering particles are obtained by mixing a particle group with an average particle size of less than 7 μm having one or more local maximum values in its particle size distribution and a particle group with an average particle size of more than 7 μm having one or more local maximum values in its particle size distribution, and satisfy following expressions: 1 μm≦Ds<7 μm; 7 μm