There is provided a display device including a substrate, a partition wall on the substrate, a light-emitting element on the substrate in a light-emitting area partitioned by the partition wall, and extending in a thickness direction of the substrate, a light conversion layer on the light-emitting element in the light-emitting area, and configured to convert a wavelength of light emitted from the light-emitting element or to transmit the light, and an optical member including an optical pattern on the partition wall, and an optical layer on the light conversion layer, wherein a refractive index of the optical layer and a refractive index of the optical pattern are different from each other.