Stereoscopic image projection system
View Patent ↗A liquid crystal display projection system for pictures that can be viewed stereoscopically, comprising: a source of 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.
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.
2. The system of claim 1 , wherein the first imager and the second imager are liquid crystal on silicon display devices.
3. The system of claim 1 , comprising only said first and second imagers.
4. The system of claim 3 , wherein the system further comprises a color wheel placed between at least the first polarizing beam splitter and the source of unpolarized light.
5. The system of claim 1 , wherein the system further comprises a projection lens.
6. The system of claim 5 , wherein the at least first polarizing beam splitter comprises a wire grid polarizer.
7. The system of claim 1 , wherein the liquid crystal display projection system further comprises a pair of polarizing glasses worn by a viewer of the device wherein the polarizing glasses has a right lens polarizer oriented to allow only S polarized light through and a left lens polarizer oriented to allow only P polarized light through.
8. The system of claim 7 , wherein the S polarized light passing through the right lens polarizer corresponds to the right image and the P polarized light passing through the left lens polarizer corresponds to the left image.