Originally Posted by walford
Then it is not usinga new ropiatary technology and can not be separate 1080ppolarized images to both eyesdisplayed at the same time unless the screen has a resoluton of 3960x1080. or 1920x2260.
No, they have two internal engines, think: separate projectors sending light through the same lens. Each engine's light is polarized differently, allowing the polarized glasses to filter out the image of the respective other eye.
Each engine is running at 1920x1080 at 60Hz, and unlike the shutter or single engine systems, each image stays for 1/60th of a second, not 1/120th. This gives you full brightness for each eye.
The two images from the two projectors are projected on top of each other, through the one lens. (EDIT: That is, projected into the same spot, not next to each other, of course)
The single engine polarized projection system run at a double frame rate, and use a "Z-Screen" to alternate the polarity of the light. This means, that each eye only sees a picture for half the time.
E.g. the RealD digital projections in theaters work that way. The projector runs at 144 Hz. The Z-Screen alternates at 72 Hz. Each eye is seeing 72 frames per second, but each frame is only 1/144th second long.