Patent ID: 8405794

Claim:
A light diffusing element, comprising: a matrix containing a resin component and an ultrafine particle component; and light diffusing fine particles dispersed in the matrix, wherein: refractive indices of the resin component, the ultrafine particle component, and the light diffusing fine particles satisfy the below-indicated expression (1); and the light diffusing element comprises a concentration adjusted area, which is formed in an outer portion of a vicinity of a surface of each of the light diffusing fine particles, and in which a weight concentration of the resin component decreases and a weight concentration of the ultrafine particle component increases with increasing distance from the light diffusing fine particles: | n P −n A |<|n P −n B | (1) where n A represents the refractive index of the resin component of the matrix, n B represents the refractive index of the ultrafine particle component of the matrix, and n P represents the refractive index of the light diffusing fine particles.