Provided is a display panel, comprising a substrate, and a plurality of film layers sequentially disposed on the substrate. The display panel has m paths orthogonal to a surface of the substrate, and including a first path and a second path comprising different film layers. When a thickness of the film layer is set to a preset thickness and/or when a refractive index is set to a preset refractive index, the display panel allows an externally incident light to enter therein in a direction orthogonal to the surface of the substrate, and pass through the first path and the second path. A difference value between optical lengths of the first path and the second path is an integer multiple of a wavelength of the externally incident light.