Patent ID: 7364302

Claim:
A projection system, comprising: a first light source to generate first light having a first spectrum; a second light source to generate second light having a second spectrum different from the first spectrum; and a projection core, comprising a first polarizing beamsplitter (PBS) having first and second input faces, at least a second PBS, wherein the second PBS comprises, a polarization beamsplitting layer, and a dichroic optical layer being substantially transparent for light of the first spectrum in a first polarization state and being substantially reflective for light of the second spectrum in a second polarization state orthogonal to the first polarization state, and a first imager unit and a second imager unit, the projection core having no more than the first and second imager units, wherein the first light is incident on the first input face of the first PBS and the second light is incident on a second input face of the first PBS at least some of the first light propagates from the first PBS to the first imager unit via the second PBS.