Patent ID: 8110276
Filing Date: 2012-02-07
Classification: G02B,Y10T

Abstract:
1. A light diffusion sheet comprising a transparent substrate layer, and a light diffusion layer overlaid on the front face side of the substrate layer, wherein the light diffusion layer has resin beads and a resin binder, the light diffusion layer has protruding parts having a shape of a partial spherical body on the front face in a scattering manner, the resin beads including small monodisperse beads as a principal component, and large monodisperse beads, having a particle size greater than the small monodisperse beads, as a subcomponent, the mean particle size of the small monodisperse beads being 1.5 μm to 5 μm, the weight ratio of the resin beads to the binder being 2.5 to 3.0, the amount of the overlaid light diffusion layer being 3 g/m the mean particle size of the large beads being 3 μm to 15 μm, the weight ratio of the small monodisperse beads to the large monodisperse beads being 6/4 to 9/1, the coefficient of variation of particle size distribution of the small monodisperse beads is 0.2 or less, and the mean occupancy rate of the protruding parts is 2% to 20%, the mean height of the protruding parts is 1 μm or greater and 10 μm or less, and the mean diameter of the protruding parts is 4 μm or greater and 18 μm or less.