A cathode includes a diffusion layer, and a porous catalyst layer provided on the diffusion layer. Each demapper is configured to have one or more complex symbols associated therewith and is responsible for demapping its associated complex symbols. The surface of the first substrate is not on the substantially same plane as the surface of the second substrate. One preferred embodiment eliminates internal polarizers between CSLM stages, thereby providing an additive common-path full-color display with only two neutral polarizers.