TECHNOLOGY FOCUS - POLYMERS - Preferred Resin: The epoxy resin with dicyclopentadiene type structure has structure of formula (1):Preferred Composition: The epoxy resin further contains cyclo aliphatic epoxy resin, and content of epoxy resin having dicyclo pentadiene type structure is 20-75 weight % with respect to all epoxy resins. The content of light diffusion agent is 0.1-60 weight parts with respect to total amount of epoxy resin. Preferred Properties: The light diffusion agent has average particle diameter of 0.2-100 micronsm. The absolute value of difference of epoxy resin and refractive index of light diffusion agent is 0.03-0.3. The sheet has glass transition temperature of 170 degrees C or more, light transmittance of 88% or more, and fracture strength of more than 45 N. Preferred Sheet: The resin sheet further has a hard coat layer and a gas barrier layer.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Agent: The light diffusion agent is chosen from particles of silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide and antimony oxide. EXAMPLE - HP-7200L (epoxy resin having dicyclo pentadiene structure) (in weight parts) (24.6), 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexane carboxylate of formula-2 (26.6), methyl hexahydro phthalic anhydride of formula-3 (48.5), and tetra-N-butyl phosphonium-o,o-diethyl phosphoro dithioate (4), and epoxy resin liquid having refractive index of 1.52 was obtained. The obtained liquid (840) was further blended with silica particle (8.4) having average particle diameter of 12 nm, refractive index of 1.46 and specific gravity of 2.2 g, and light diffusion agent containing epoxy resin liquid was obtained. The resultant liquid was applied on support, and epoxy resin layer was formed. A gas barrier layer and a hard coat layer were further provided on the epoxy resin layer of resin sheet, and resin sheet laminate was obtained. The resin sheet had refractive index of 1.52, glass transition temperature of 201degreesC, light transmittance of 90%, and fracture strength of 72 N.