A display panel includes a plurality of first light-emitting devices and a plurality of second light-emitting devices. A ratio of a cavity length of each of the first light-emitting devices and a wavelength of a corresponding light-emitting color is a first ratio. A ratio of a cavity length of each of the second light-emitting devices and a wavelength of a corresponding light-emitting color is a second ratio. The first ratio and the second ratio are different.