A polymer film having a laminated structure is provided. The polymer film includes a plurality of first overlapping film units and a plurality of second overlapping film units disposed in an alternately-laminated manner with the first overlapping film units. Each of the first overlapping film units includes a first lower film and a first upper film, and each of the first overlapping film units is configured to reflect visible light in a first visible light wavelength range. Each of the second overlapping film units includes a second lower film and a second upper film, and each of the second overlapping film units is configured to reflect visible light in a second visible light wavelength range. The first visible light wavelength range is different from the second visible light wavelength range.