Patent ID: 8827464

Claim:
A projection display device, comprising: a light source unit including light sources emitting light fluxes in a plurality of colors, condenser lenses, via each of which the light fluxes emitted from the light sources are condensed and are output as substantially parallel light fluxes, and a color combining optical element having a plurality of entry surfaces which the substantially parallel light fluxes respectively enter and an exit surface, combining the substantially parallel light fluxes as a combined light flux and outputting the combined light flux through the exit surface; an image forming unit that forms an image in a display area thereof; a total reflection prism that has an entry surface which the combined light flux having been output by the color combining optical element enters, a total reflection surface, a first exit surface and a second exit surface, totally reflects the combined light flux at the total reflection surface, outputs the combined light flux through the first exit surface so as to guide the combined light flux to the display area of the image forming unit after the combined light flux has been totally reflected and outputs reflected light reflected from the image forming unit through the second exit surface; and a projection lens that projects the reflected light output from the total reflection prism onto a projection surface, wherein: at least one of the plurality of entry surfaces of the color combining optical element, the exit surface of the color combining optical element, and the entry surface of the total reflection prism, is formed as a free curved surface, the free curved surface altering a shape of a section of light flux having entered the free curved surface to a predetermined shape which corresponds to a shape of an outline of the display area.