TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Properties: The average particle diameter of the light diffusion agent is 0.2-100 microns. The absolute value of difference of refractive index of the epoxy resin and refractive index of the light diffusion agent is 0.03-0.3. Preferred Agent: The light diffusion agent is silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide and/or antimony oxide particle.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Properties: The average particle diameter of the light diffusion agent is 0.2-100 microns. The absolute value of difference of refractive index of the epoxy resin and refractive index of the light diffusion agent is 0.03-0.3. Preferred Agent: The light diffusion agent is silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide and/or antimony oxide particle.    TECHNOLOGY FOCUS - POLYMERS - Preferred Structure: The poly sulfite type structure of the epoxy resin is given by formula (1).R1 and R2=organic acid having bisphenol structure;andn=degree polymerization.Preferred Resin: The epoxy resin further contains a cycloaliphatic epoxy resin. Preferred Composition: The content rate of the epoxy resin having poly sulfite type structure and light diffusion agent is 3-30 wt.%, and 0.1-60 wt.pts with respect to total amount of epoxy resin, respectively. Preferred Sheet: The resin sheet further has a hard coat layer and gas barrier layer. Preferred Properties: The glass transition temperature, light transmittance and fracture intensity of the particle dispersed type resin sheet is 170degreesC or more, 88% or more and more than 45N, respectively. EXAMPLE - Poly sulfite type epoxy resin (with epoxy equivalent of 320, viscosity of 25 Pa.seconds at 25degreesC and refractive index of 1.53) (in wt.pts) (26.6), 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexane carboxylate (26.6), methyl hexa hydrophthalic anhydride (48.5) and tetra-n-butyl phosphonium o,o-diethyl phosphoro dithioate (1) were mixed to obtained epoxy resin liquid. The obtained liquid (840) was mixed with silica particle (with average particle diameter of 12 nm, specific gravity of 2.2 g and refractive index of 1.46) (8.4) to obtain liquid (A). Liquid (A) was applied on a gas barrier layer and hardened to form epoxy resin layer of 400 microns thickness. The obtained laminate was peeled from the endless belt and cured to obtain particle dispersed type resin sheet. The glass transition temperature, light transmittance and fracture intensity of the obtained resin sheet was 120degreesC, 88% and 150 N, respectively.