A display device, comprising: a backlight and a display panel on the backlight; wherein the backlight includes: a light source to provide a first light and either a light guide plate disposed below an optical wavelength converter and the light source being provided on at least a side surface of the light guide plate or a diffusion plate disposed below an optical wavelength converter and the light source being provided below the diffusion plate; and wherein the optical wavelength converter being configured to receive the first light and emit a second light, wherein the second light being different from the first light, the optical wavelength converter including: a light emitting part having a plurality of excitation light emitting bodies configured to be excited by receiving the first light, and thereby emit the second light, wherein the excitation light emitting bodies exclude quantum dots, and a light absorbing part including a plurality of absorbers provided on the light emitting part configured to receive the second light and absorb a portion of the second light having a wavelength of 550 nm to 650 nm, wherein the optical wavelength converter is provided between the light guide plate and the display panel when solely the light guide plate is provided and the optical wavelength converter is provided between the diffusion plate and the display panel when solely the diffusion plate is provided a backlight and a display panel on the backlight; wherein the backlight includes: a light source to provide a first light and either a light guide plate disposed below an optical wavelength converter and the light source being provided on at least a side surface of the light guide plate or a diffusion plate disposed below an optical wavelength converter and the light source being provided below the diffusion plate; and wherein the optical wavelength converter being configured to receive the first light and emit a second light, wherein the second light being different from the first light, the optical wavelength converter including: a light emitting part having a plurality of excitation light emitting bodies configured to be excited by receiving the first light, and thereby emit the second light, wherein the excitation light emitting bodies exclude quantum dots, and a light absorbing part including a plurality of absorbers provided on the light emitting part configured to receive the second light and absorb a portion of the second light having a wavelength of 550 nm to 650 nm, wherein the optical wavelength converter is provided between the light guide plate and the display panel when solely the light guide plate is provided and the optical wavelength converter is provided between the diffusion plate and the display panel when solely the diffusion plate is provided a light source to provide a first light and either a light guide plate disposed below an optical wavelength converter and the light source being provided on at least a side surface of the light guide plate or a diffusion plate disposed below an optical wavelength converter and the light source being provided below the diffusion plate; and wherein the optical wavelength converter being configured to receive the first light and emit a second light, wherein the second light being different from the first light, the optical wavelength converter including: a light emitting part having a plurality of excitation light emitting bodies configured to be excited by receiving the first light, and thereby emit the second light, wherein the excitation light emitting bodies exclude quantum dots, and a light absorbing part including a plurality of absorbers provided on the light emitting part configured to receive the second light and absorb a portion of the second light having a wavelength of 550 nm to 650 nm, wherein the optical wavelength converter is provided between the light guide plate and the display panel when solely the light guide plate is provided and the optical wavelength converter is provided between the diffusion plate and the display panel when solely the diffusion plate is provided a light emitting part having a plurality of excitation light emitting bodies configured to be excited by receiving the first light, and thereby emit the second light, wherein the excitation light emitting bodies exclude quantum dots, and a light absorbing part including a plurality of absorbers provided on the light emitting part configured to receive the second light and absorb a portion of the second light having a wavelength of 550 nm to 650 nm, wherein the optical wavelength converter is provided between the light guide plate and the display panel when solely the light guide plate is provided and the optical wavelength converter is provided between the diffusion plate and the display panel when solely the diffusion plate is provided