A single plate type optical unit and display device to utilize light with high
efficiency in a simple method is configured so a dichroic mirror separates light
into a plurality of colors, and the plurality of colors of light reflected by the
dichroic mirror are beamed onto a rotating multisurface element, the plurality
of colors of light emitted from the rotating multisurface element are each beamed
onto different locations on the display element, and by rotating the rotating multisurface
element, the plurality of colors of light are moved in one direction along the
display element, and a color image is beamed from a projection lens.
