An apparatus for displaying an image, comprising: an input image node configured to provide at least first and second image modulated lights; and a holographic waveguide device configured to propagate at least one of the first and second image modulated lights in at least a first direction, the holographic waveguide device comprising: interspersed multiplicities of switchable Bragg grating elements, comprising at least a first multiplicity of switchable Bragg grating elements and a second multiplicity of switchable Bragg grating elements, disposed in at least one layer (21, 22), the first multiplicity of switchable Bragg grating elements and the second multiplicity of switchable Bragg grating elements having respectively a first and a second Bragg grating geometry, each multiplicity of switchable Bragg grating elements having a Bragg grating geometry corresponding to a unique field of view region; wherein the first and second image modulated lights are modulated respectively with first field of view image information and second field of view image information; wherein the first multiplicity of switchable Bragg grating elements are configured to deflect, through diffraction, the first image modulated light out of the at least one layer (21, 22) into a first multiplicity of output rays forming a first field of view region, and the second multiplicity of switchable Bragg grating elements are configured to deflect, through diffraction, the second image modulated light out of the layer (21, 22) into a second multiplicity of output rays forming a second field of view region, characterized in that within the at least one layer (21, 22) the interspersed multiplicities of switchable Bragg grating elements have integer N1 different Bragg grating geometries interspersed in a first band, abutted to the left and right, in sequence, by bands containing elements of integer N2 different Bragg grating geometries where N1>N2, integer N3 different Bragg grating geometries where N2>N3, and integer N4 different Bragg grating geometries where N3>N4. an input image node configured to provide at least first and second image modulated lights; and a holographic waveguide device configured to propagate at least one of the first and second image modulated lights in at least a first direction, the holographic waveguide device comprising: interspersed multiplicities of switchable Bragg grating elements, comprising at least a first multiplicity of switchable Bragg grating elements and a second multiplicity of switchable Bragg grating elements, disposed in at least one layer (21, 22), the first multiplicity of switchable Bragg grating elements and the second multiplicity of switchable Bragg grating elements having respectively a first and a second Bragg grating geometry, each multiplicity of switchable Bragg grating elements having a Bragg grating geometry corresponding to a unique field of view region; interspersed multiplicities of switchable Bragg grating elements, comprising at least a first multiplicity of switchable Bragg grating elements and a second multiplicity of switchable Bragg grating elements, disposed in at least one layer (21, 22), the first multiplicity of switchable Bragg grating elements and the second multiplicity of switchable Bragg grating elements having respectively a first and a second Bragg grating geometry, each multiplicity of switchable Bragg grating elements having a Bragg grating geometry corresponding to a unique field of view region; wherein the first and second image modulated lights are modulated respectively with first field of view image information and second field of view image information; wherein the first multiplicity of switchable Bragg grating elements are configured to deflect, through diffraction, the first image modulated light out of the at least one layer (21, 22) into a first multiplicity of output rays forming a first field of view region, and the second multiplicity of switchable Bragg grating elements are configured to deflect, through diffraction, the second image modulated light out of the layer (21, 22) into a second multiplicity of output rays forming a second field of view region, characterized in that within the at least one layer (21, 22) the interspersed multiplicities of switchable Bragg grating elements have integer N1 different Bragg grating geometries interspersed in a first band, abutted to the left and right, in sequence, by bands containing elements of integer N2 different Bragg grating geometries where N1>N2, integer N3 different Bragg grating geometries where N2>N3, and integer N4 different Bragg grating geometries where N3>N4.