There are provided a gas barrier film, which can undergo winding processing, is less likely to cause elongation or deflection upon exposure to heat or the like during processing or use, has a high level of dimensional stability, is less likely to be attacked by chemicals or the like during processing or use, can form a stable gas barrier layer, and has a high level of gas barrier properties against water vapor, oxygen and the like, and a display substrate and a display using said gas barrier film.
The gas barrier film comprises: a base material film 11 having a deflection temperature under load of 150° C. or above; and at least a gas barrier layer 13A and a smoothing layer 15A in that order, or a smoothing layer 15A and a gas barrier layer 13A in that order provided on the base material film 11. Preferably, the base material film 11 is polyethylene naphthalate, the gas barrier layer 13A is formed of an inorganic oxide, an inorganic oxynitride, an inorganic oxycarbide, or an inorganic oxycarbonitride, and the smoothing layer 15A formed of a cardo polymer, sol-gel, or a material containing an acryl structure.