A head-mounted virtual image display apparatus , comprising: a projector operable to direct image-bearing light beams (B1, B2, B3, B4, B5) along a projection axis (A3), wherein the projector is arranged along a temple member ; and a planar waveguide extending in a plane (P) defined by an output aperture side of the planar waveguide ; wherein the planar waveguide is configured to receive the image-bearing light beams (B1, B2, B3, B4, B5) through an input aperture , to expand the image-bearing light beams (B1, B2, B3, B4, B5), and to output the expanded image-bearing light beams (B1, B2, B3, B4, B5) through the output aperture of the planar waveguide ; and wherein the output aperture is spaced apart from the input aperture along the planar waveguide ; characterised by an orientation of the planar waveguide at an obtuse angle (α1) with respect to the projection axis (A3) on the output aperture side of the planar waveguide ; and characterised by an optical coupler that is configured to receive the image-bearing light beams (B1, B2, B3, B4, B5) along the projection axis (A3), reorient the projection axis (A3) to an acute angle (α2) of incidence with respect to the plane (P), rotate the image-bearing light beams (B1, B2, B3, B4, B5) about the projection axis (A3), and direct the rotated image-bearing light beams (B1, B2, B3, B4, B5) along the reoriented projection axis (A3") through the input aperture of the planar waveguide . a projector operable to direct image-bearing light beams (B1, B2, B3, B4, B5) along a projection axis (A3), wherein the projector is arranged along a temple member ; and a planar waveguide extending in a plane (P) defined by an output aperture side of the planar waveguide ; wherein the planar waveguide is configured to receive the image-bearing light beams (B1, B2, B3, B4, B5) through an input aperture , to expand the image-bearing light beams (B1, B2, B3, B4, B5), and to output the expanded image-bearing light beams (B1, B2, B3, B4, B5) through the output aperture of the planar waveguide ; and wherein the output aperture is spaced apart from the input aperture along the planar waveguide ; characterised by an orientation of the planar waveguide at an obtuse angle (α1) with respect to the projection axis (A3) on the output aperture side of the planar waveguide ; and characterised by an optical coupler that is configured to receive the image-bearing light beams (B1, B2, B3, B4, B5) along the projection axis (A3), reorient the projection axis (A3) to an acute angle (α2) of incidence with respect to the plane (P), rotate the image-bearing light beams (B1, B2, B3, B4, B5) about the projection axis (A3), and direct the rotated image-bearing light beams (B1, B2, B3, B4, B5) along the reoriented projection axis (A3") through the input aperture of the planar waveguide . receive the image-bearing light beams (B1, B2, B3, B4, B5) along the projection axis (A3), reorient the projection axis (A3) to an acute angle (α2) of incidence with respect to the plane (P), rotate the image-bearing light beams (B1, B2, B3, B4, B5) about the projection axis (A3), and direct the rotated image-bearing light beams (B1, B2, B3, B4, B5) along the reoriented projection axis (A3") through the input aperture of the planar waveguide . <EOS>