There is provided an apparatus for displaying an image, the apparatus comprising: an input image node configured to provide modulated light; and a plurality of waveguides configured to propagate the modulated light in a propagation direction along the direction of the waveguides, the plurality of waveguides being stacked, each waveguide of the plurality of waveguides having a curved output surface and a grating, wherein each waveguide of the plurality of waveguides is configured to deflect the modulated light out of each of the curved output surfaces via the grating.