TECHNOLOGY FOCUS - POLYMERS - Preferred Sheet : The resin sheet comprises a resin layer containing the epoxy resin and the glass fiber fabric. The resin sheet has an in-plane phase difference of 2 nm and a thickness-direction phase difference of 40 nm. The resin sheet has a linear expansion coefficient at 25 - 160 degrees Celsius of 3.00 x 10-6/ degrees Celsius or lower and a light transmission of 88 % or higher. The sheet has a surface roughness (Rt) of 2 microns or less. In the resin sheet, the absolute value of the difference between the diffraction coefficients of the glass fiber fabric and the resin layer lies between 0 and 0.01. In the resin sheet the proportions of the resin layer containing the epoxy resin, and the glass fiber fabric are 20 - 80 wt% and 80 - 20 wt%, respectively. In the resin sheet the glass fiber fabric and the resin layer form a mono-layered sheet in which both are united into one body. In the sheet, the epoxy resin layer is formed by curing the epoxy resin to obtain a state such that the glass fiber fabric is impregnated with the epoxy resin. In the resin sheet the glass fiber fabric is buried inside the resin layer containing the epoxy resin. The resin sheet further contains a hard-coat layer and/or a gas-barrier layer.Preferred Display: An image display device and an electroluminescence display substrate contain the epoxy resin sheet. WIDER DISCLOSURE - A liquid crystal cell substrate contains the invented resin sheet. The liquid crystal cell contains the invented liquid crystal cell substrate and a liquid crystal. A liquid crystal display device contains the liquid crystal cell. Solar cells contain a solar cell substrate containing the invented resin sheet.    EXAMPLE - A glass cloth Glasscloth having a diffractive index of 1.542 and a thickness of 100 microns, was immersed in a resin mixture liquid comprising 3,4-epoxycylohexylmethyl-3,4-epoxycyclohexanecarboxylate (27 pts wt), bisphenol A epoxy resin AER 250 (73 pts wt), methylhexahydrophthalic acid anhydride (88 pts wt) and tetra-n-butylphosphonium o,o-diethylphosphodithioate (0.9 pts wt) for 10 days so as to obtain a resin layer/glass cloth precursor. A hard-coat layer was prepared by coating a 17 wt% urethane acrylate, represented by general formula (8), toluene solution on a glass plate and curing by irradiation with UV light. The resin layer/glass cloth precursor was laminated on the hard coat on the glass plate. A glass plate was laminated on the precursor, and then the laminate was subjected to heat-treatment at 120 degrees Celsius for 1 hour so as to obtain a laminate sheet of an epoxy resin layer/hard coat. The sheet has a linear expansion coefficient of 1.8 x 10-4 /degrees Celsius, a transmittance of 90 % and a haze value of 8 %. The sheet has excellent mechanical strength.