Patent ID: 7479933
Filing Date: 2009-01-20
Classification: G02B,H04N

Abstract:
1. Stereoscopic display apparatus comprising: first and second projectors having inputs connectable to a source of digital data representing the color components of color sets of two stereoscopic images, each of said projectors having an output outputting an optical beam having a set of color components in which at least one color component of each color set is of an orthogonal polarization state with respect to the other color components of the respective set; a polarization preserving screen; a first optical polarization rectifier using exclusively optical retarders to manipulate said polarization states in said first projector in such manner that the polarization states of the different color components in said first projector are converted to a single first polarization state; a second optical polarization rectifier using exclusively optical retarders to manipulate said polarization states in said second projector in such manner that the polarization states of the different color components in said first projector are converted to a second single polarization state; said first and second single polarization states being mutually orthogonal; polarizing clean-up filters arranged for increasing the polarization ratio of the output beams; and stacking means for stacking said two color sets onto said polarization preserving screen such as to enable stereoscopic viewing of the two color sets via orthogonally polarized filters.