Patent ID: 7204592
Filing Date: 2007-04-17
Classification: A61K,A61Q,H04N

Abstract:
1. A liquid crystal display projection system for pictures that can be viewed stereoscopically, comprising: means for supplying a repetitive three color sequence of light; first and second imagers responsive to respective drive signals representative of the same picture from different angles of view; at least a first polarizing beam splitter for separating said repetitive three-color sequence of light into a P polarized three color sequence of light and an S polarized three color sequence of light, said S polarized three color sequence of light illuminating said first imager and said P polarized three color sequence of light illuminating said second imager; a first filter for removing P polarized light directed to said first imager; and, a second filter for removing P polarized light reflected from said second imager, wherein said light reflected from said first imager and said light filtered by said second filter form a stereoscopic image when viewed through respective P and S polarizing lenses; wherein the at least first polarizing beam splitter comprises four polarizing beam splitters including the first polarizing beam splitter, a second polarizing beam splitter for directing S polarized light split from the first polarizing beam splitter toward the second imager, a third polarizing beam splitter for directing S polarized light reflected from the first imager towards a fourth polarizing beam splitter, wherein the fourth polarizing beam splitter directs S polarized light reflected from the first imager and P polarized light from the second imager towards the projection lens; and wherein the system further comprises a first quarter wave plate between the third polarizing beam splitter and the first imager and a second quarter wave plate between the second polarizing beam splitter and the second imager.