A wave-guiding device (1700, 1800, 1900, 2000, 2220, 2500, 2600) comprising: one or more cholesteric liquid crystal, CLC, layers (1004, 1008, 1158, 1358A, 1358B, 1404, 1424) each comprising a plurality of chiral structures (1012-1,..., 1012-i, 1162-1,..., 1162-i), wherein each chiral structure comprises a plurality of liquid crystal molecules (1012-1-1,..., 1012-i-j, 1162-1-1,..., 1162-i-j) that extend in a layer depth direction (z) and are successively rotated in a first rotation direction, wherein arrangements of the liquid crystal molecules (1012-1-1,..., 1012-i-j, 1162-1-1,..., 1162-i-j) of the chiral structures (1012-1,..., 1012-i, 1162-1,..., 1162-i) vary periodically in a lateral direction (x) perpendicular to the layer depth direction (z) such that the one or more CLC layers (1004, 1008, 1158, 1358A, 1358B, 1404, 1424) are configured to Bragg-reflect incident light; and one or more waveguides (1182, 1184, 1186, 1188, 1190) formed over the one or more CLC layers (1004, 1008, 1158, 1358A, 1358B, 1404, 1424) and configured to optically couple Bragg-reflected light from the one or more CLC layers (1004, 1008, 1158, 1358A, 1358B, 1404, 1424) such that the Bragg-reflected light travels in the lateral direction under total internal reflection, TIR, the wave-guiding device (1700, 1800, 1900, 2000, 2220, 2500, 2600) being characterized in that it is configured to have a field of view, FOV, within which a diffraction efficiency is greater than 25%, which exceeds 20°, wherein different ones of the one or more CLC layers (1004, 1008, 1158, 1358A, 1358B, 1404, 1424) have liquid crystal molecules that extend in the layer depth direction at different helical pitches (p, p1, p2, p3, p4). one or more cholesteric liquid crystal, CLC, layers (1004, 1008, 1158, 1358A, 1358B, 1404, 1424) each comprising a plurality of chiral structures (1012-1,..., 1012-i, 1162-1,..., 1162-i), wherein each chiral structure comprises a plurality of liquid crystal molecules (1012-1-1,..., 1012-i-j, 1162-1-1,..., 1162-i-j) that extend in a layer depth direction (z) and are successively rotated in a first rotation direction, wherein arrangements of the liquid crystal molecules (1012-1-1,..., 1012-i-j, 1162-1-1,..., 1162-i-j) of the chiral structures (1012-1,..., 1012-i, 1162-1,..., 1162-i) vary periodically in a lateral direction (x) perpendicular to the layer depth direction (z) such that the one or more CLC layers (1004, 1008, 1158, 1358A, 1358B, 1404, 1424) are configured to Bragg-reflect incident light; and one or more waveguides (1182, 1184, 1186, 1188, 1190) formed over the one or more CLC layers (1004, 1008, 1158, 1358A, 1358B, 1404, 1424) and configured to optically couple Bragg-reflected light from the one or more CLC layers (1004, 1008, 1158, 1358A, 1358B, 1404, 1424) such that the Bragg-reflected light travels in the lateral direction under total internal reflection, TIR, the wave-guiding device (1700, 1800, 1900, 2000, 2220, 2500, 2600) being characterized in that it is configured to have a field of view, FOV, within which a diffraction efficiency is greater than 25%, which exceeds 20°, wherein different ones of the one or more CLC layers (1004, 1008, 1158, 1358A, 1358B, 1404, 1424) have liquid crystal molecules that extend in the layer depth direction at different helical pitches (p, p1, p2, p3, p4).