An optical component (23; 31) for a display apparatus comprising: an optical waveguide part arranged to guide light therealong between surface parts thereof by internal reflection thereat; an input part (12, 13) arranged to receive light and direct the received light into the optical waveguide part; and, an output part comprising a partially transmissive angularly reflective optical coating arranged upon a said surface part of the optical waveguide part and optically coupled to the input part by the optical waveguide part to receive said guided light and to transmit some but not all of said guided light out from the optical waveguide part; wherein the output part includes an output reflector part (17, 18) optically coupled to the angularly reflective optical coating for receiving said transmitted light from the angularly reflective optical coating and reflecting the transmitted light in a direction through surface parts of the waveguide part for output; the output part includes a quarter wave plate arranged betw een the angularly reflective optical coating and the output reflector part arranged to transmit light from the optical waveguide part to the output reflector part and from the output reflector part to the optical w aveguide part; and wherein the angularly reflective optical coating extends along a dimension of the optical waveguide part to expand the guided light in said dimension along the output part by repeated partial transmission thereof for output and the angularly reflective optical coating is reflective to light of S-polarisation state and transmissive to light of P-polarisation state, or is reflective to light of P-polarisation state and transmissive to light of S-polarisation state. an optical waveguide part arranged to guide light therealong between surface parts thereof by internal reflection thereat; an input part (12, 13) arranged to receive light and direct the received light into the optical waveguide part; and, an output part comprising a partially transmissive angularly reflective optical coating arranged upon a said surface part of the optical waveguide part and optically coupled to the input part by the optical waveguide part to receive said guided light and to transmit some but not all of said guided light out from the optical waveguide part; wherein the output part includes an output reflector part (17, 18) optically coupled to the angularly reflective optical coating for receiving said transmitted light from the angularly reflective optical coating and reflecting the transmitted light in a direction through surface parts of the waveguide part for output; the output part includes a quarter wave plate arranged betw een the angularly reflective optical coating and the output reflector part arranged to transmit light from the optical waveguide part to the output reflector part and from the output reflector part to the optical w aveguide part; and wherein the angularly reflective optical coating extends along a dimension of the optical waveguide part to expand the guided light in said dimension along the output part by repeated partial transmission thereof for output and the angularly reflective optical coating is reflective to light of S-polarisation state and transmissive to light of P-polarisation state, or is reflective to light of P-polarisation state and transmissive to light of S-polarisation state. wherein the output part includes an output reflector part (17, 18) optically coupled to the angularly reflective optical coating for receiving said transmitted light from the angularly reflective optical coating and reflecting the transmitted light in a direction through surface parts of the waveguide part for output; the output part includes a quarter wave plate arranged betw een the angularly reflective optical coating and the output reflector part arranged to transmit light from the optical waveguide part to the output reflector part and from the output reflector part to the optical w aveguide part; and wherein the angularly reflective optical coating extends along a dimension of the optical waveguide part to expand the guided light in said dimension along the output part by repeated partial transmission thereof for output and the angularly reflective optical coating is reflective to light of S-polarisation state and transmissive to light of P-polarisation state, or is reflective to light of P-polarisation state and transmissive to light of S-polarisation state.