Patent ID: 7401923

Claim:
A system for images, comprising: a beam splitter receiving respective images, which have plane polarized light characteristics, along respective first and second light paths and directing the images to a common light path, a viewer to receive the images in the common light path to discriminate the images based on plane polarized light characteristics, the viewer having first and second viewing channels to provide for viewing the images from the first and second light paths, respectively, a first optical retarder introducing optical retardation in the first light path, the optical retarder rotating the direction of polarization of plane polarized light, and a second optical retarder introducing optical retardation in the second viewing channel and substantially compensating for dispersion by the first optical retarder, wherein the polarization direction of the plane polarized light in the first light path optically upstream of the first optical retarder is the same as the polarization direction of the plane polarized light in the second light path.