A display apparatus, comprising: at least one image pixel array relay structure comprising: a plurality of micro-LEDs (3, 3A, 3B) arranged to output light, the plurality of micro-LEDs being arranged in a micro-LED array; and a plurality of catadioptric optical elements (38, 38A, 38B) arranged in a catadioptric optical element array, wherein each of the catadioptric optical elements of the plurality of catadioptric optical elements is aligned in correspondence with a respective one or more of the micro-LEDs of the plurality of micro-LEDs, each of the micro-LEDs of the plurality of micro-LEDs being aligned with only a respective one of the catadioptric optical elements of the plurality of catadioptric optical elements; and a low reflection screen comprising a light absorbing structure arranged on a side of a transparent support substrate, wherein the light absorbing structure comprises a plurality of light transmitting apertures (317, 317A, 317B) arranged in an aperture array, the transparent support substrate being arranged between the image pixel array relay structure and the light absorbing structure, and the light absorbing structure comprises a microstructured surface, wherein the average reflectance to white light of the light absorbing structure is less than 4%, and wherein the at least one image pixel array relay structure and the low reflection screen are aligned such that the light from each of the micro-LEDs and its respective aligned catadioptric optical element is relayed to at least one of the light transmitting apertures. at least one image pixel array relay structure comprising: a plurality of micro-LEDs (3, 3A, 3B) arranged to output light, the plurality of micro-LEDs being arranged in a micro-LED array; and a plurality of catadioptric optical elements (38, 38A, 38B) arranged in a catadioptric optical element array, wherein each of the catadioptric optical elements of the plurality of catadioptric optical elements is aligned in correspondence with a respective one or more of the micro-LEDs of the plurality of micro-LEDs, each of the micro-LEDs of the plurality of micro-LEDs being aligned with only a respective one of the catadioptric optical elements of the plurality of catadioptric optical elements; and a plurality of micro-LEDs (3, 3A, 3B) arranged to output light, the plurality of micro-LEDs being arranged in a micro-LED array; and a plurality of catadioptric optical elements (38, 38A, 38B) arranged in a catadioptric optical element array, wherein each of the catadioptric optical elements of the plurality of catadioptric optical elements is aligned in correspondence with a respective one or more of the micro-LEDs of the plurality of micro-LEDs, each of the micro-LEDs of the plurality of micro-LEDs being aligned with only a respective one of the catadioptric optical elements of the plurality of catadioptric optical elements; and a low reflection screen comprising a light absorbing structure arranged on a side of a transparent support substrate, wherein the light absorbing structure comprises a plurality of light transmitting apertures (317, 317A, 317B) arranged in an aperture array, the transparent support substrate being arranged between the image pixel array relay structure and the light absorbing structure, and the light absorbing structure comprises a microstructured surface, wherein the average reflectance to white light of the light absorbing structure is less than 4%, and wherein the at least one image pixel array relay structure and the low reflection screen are aligned such that the light from each of the micro-LEDs and its respective aligned catadioptric optical element is relayed to at least one of the light transmitting apertures.