Patent ID: 7077528

Claim:
A digital projection display system comprising a digital projection display, wherein the digital projection display comprises: an external light source producing as an output a light beam; an internal optics system including an integrator that receives the light beam from the light source, an illumination lens that receives the light beam from the integrator, an illumination fold mirror that receives the light beam from the illumination lens, a light director that receives the light beam from the illumination fold mirror, a digital light modulator that receives the light beam from the light director and spatially modulates the light beam, a projection lens that receives the light beam in the spatially modulated form from the light director, wherein the projection lens has at least a first projection lens element and a second projection lens element spaced apart from the fist projection lens element, a projection lens fold mirror disposed between the first projection lens element and the second projection lens element, wherein the light beam passes through the first projection lens element, reflects from the projection lens fold minor, and passes through the second projection lens element, and a projection fold mirror that receives the light beam from the projection lens and redirects the light beam; a housing in which the internal optics system is received, but wherein the external light source is located external to the housing; and a display screen that receives the light beam from the projection fold mirror, wherein the display screen forms a face of the housing.