Display and related improvements A prism assembly (7) comprising an input sub-prism (1) having a first interface surface and an output sub-prism (2) having a second interface surface and adjacent the input sub-prism. The second interface surface is spaced from and proximate to the first interface surface and extends over the first interface surface to receive the display light 12 that is transmitted through the first interface surface. The panel 8 receives the illumination light totally reflected from the first interface surface from the input sub-prism and transmits it through the first interface surface so as to be received as the display light 13 by the output sub- And a plurality of selectively adjustable reflective elements arranged to selectively reflect received illumination light back through the input sub-prism.
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