TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Particle: The light diffusion agent has average particle diameter of 0.2-100 microns. The absolute value of difference of refractive index of the epoxy resin and the light diffusion agent is 0.03-0.3. The light diffusion agent is chosen from silica, titanium dioxide, antimony oxide, alumina, zirconia, tin oxide, indium oxide and cadmium oxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Particle: The light diffusion agent has average particle diameter of 0.2-100 microns. The absolute value of difference of refractive index of the epoxy resin and the light diffusion agent is 0.03-0.3. The light diffusion agent is chosen from silica, titanium dioxide, antimony oxide, alumina, zirconia, tin oxide, indium oxide and cadmium oxide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Resin: The epoxy resin having terpene type structure is of formula (1).n = degree of polymerization, preferably 0-5.The epoxy resin further contains cycloaliphatic epoxy resin.Preferred Composition: The sheet contains epoxy resin (9-60 wt.%) and light diffusion agent (0.1-60 wt.pts) with respect to all epoxy resin.Preferred Properties: The particle dispersed resin sheet has glass transition temperature of 170degreesC or more, light transmittance of 88% or more and fracture strength of more than 45 N.Preferred Layers: The particle dispersed resin sheet further contains hard coat layer and gas barrier layer. EXAMPLE - Terpene type epoxy resin (in wt.pts) (26.6), 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexane carboxylate (26.6), methyl hexahydro phthalic anhydride (45.8) and tetra-n-butyl phosphonium-o,o-diethyl phosphoro dithioate (1) were stir-mixed to obtain epoxy resin liquid. Silica particles (8.4) with average particle diameter of 12 nm were added to the epoxy resin liquid (840), and stir-mixed to obtain particle-containing resin liquid. The obtained liquid was flow-spread and dried to form particle-containing epoxy resin layer and particle dispersed resin sheet was obtained. The obtained sheet had light transmittance of 89%, glass transition temperature of 212degreesC, fracture strength of 86 N, and excellent heat-resisting property and toughness.