Digital projectors often use fly's eyes integrators to provide homogenization of the source lamp's output (see my article on this here). This allows a very elegant integration of the PCS with the homogenizer optics. The PCS optics can be mounted on the field array of the integrator like so:


Because the PCS is mounted at the field array, the small lateral offset introduced does not matter, as the condensor lens produces a uniform illumination on the LCD or LCoS panel:


We can see a layout of the fly’s eye array with the PCS array on the back surface of the second array and then a single element condenser lens above.  The function of the condenser lens is to overlap all of the individual channels, in the fly’s eye array of channels, on top of each other.  This chopping up of the non-uniform illumination from the lamp assembly and overlapping each channel on top of each other is what enable the fly’s eye array to provide uniform illumination at the spatial light modulator panels, plus convert all the unwanted polarization into the desired polarization.