A display device comprising: an image projector comprising an image forming device and a meta-lens module , the image projector configured to output image light (L1) formed by the image forming device; and a meta-waveguide configured to transfer the image light output from the image projector to a field of view of a user, the meta-waveguide comprising: a waveguide element configured to totally reflect light inside the waveguide element, an input coupler comprising a plurality of first nanostructures (NS1) configured to form a first phase gradient in a first direction (X), the input coupler configured to couple the image light from the image projector to the inside of the waveguide element, wherein the first phase gradient is in a form in which a phase modulation pattern of a monotonic increase or decrease in a first range is repeated in the first direction, and an output coupler comprising a plurality of second nanostructures (NS2) configured to form a second phase gradient in a second direction (Y) different from the first direction, the output coupler configured to output the image light coupled to the inside of the waveguide element by the input coupler, to an outside of the waveguide element. an image projector comprising an image forming device and a meta-lens module , the image projector configured to output image light (L1) formed by the image forming device; and a meta-waveguide configured to transfer the image light output from the image projector to a field of view of a user, the meta-waveguide comprising: a waveguide element configured to totally reflect light inside the waveguide element, an input coupler comprising a plurality of first nanostructures (NS1) configured to form a first phase gradient in a first direction (X), the input coupler configured to couple the image light from the image projector to the inside of the waveguide element, wherein the first phase gradient is in a form in which a phase modulation pattern of a monotonic increase or decrease in a first range is repeated in the first direction, and an output coupler comprising a plurality of second nanostructures (NS2) configured to form a second phase gradient in a second direction (Y) different from the first direction, the output coupler configured to output the image light coupled to the inside of the waveguide element by the input coupler, to an outside of the waveguide element. a waveguide element configured to totally reflect light inside the waveguide element, an input coupler comprising a plurality of first nanostructures (NS1) configured to form a first phase gradient in a first direction (X), the input coupler configured to couple the image light from the image projector to the inside of the waveguide element, wherein the first phase gradient is in a form in which a phase modulation pattern of a monotonic increase or decrease in a first range is repeated in the first direction, and an output coupler comprising a plurality of second nanostructures (NS2) configured to form a second phase gradient in a second direction (Y) different from the first direction, the output coupler configured to output the image light coupled to the inside of the waveguide element by the input coupler, to an outside of the waveguide element. <EOS>