The optical efficiency of a single-LCD projector can be improved by 'spatio-chromatic illumination' method. It consists of an angular separation of the three primary colors combined with a focusing of each color in the corresponding pixel by a microlens array. To perform the spatio-chromatic illumination we present two innovative systems based on volume holographic components. The dispersion property of these components realizes the angular separation of the primary colors, the focusing being performed either by classical or holographic microlens. A complete luminous efficiency analysis of spatio-chromatic illumination with volume holographic elements is reported. The luminous flux analysis will take into account etendue limitation considerations. Experimental results will be given for a prototype of single-LCD projector using a volume holographic grating.
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