A color conversion filter substrate includes a transparent support substrate, at least one color conversion filter layer formed of a resin film containing a fluorescence colorant with a thickness of at least 5 m and arranged on the support substrate in a desired pattern, and a transparent gas-barrier layer formed in a flat film for covering the color conversion layer. The gas-barrier layer has a water-vapor permeability of 1.0 g/m224 hr or less, and a portion covering the color conversion filter layer with a thickness tPL expressed by the following equation,

wherein W is a minimum width of a pixel.

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