@raygun
Here is a site which explains what top/bottom 3D is as well as other formats.
Its basically what I said it was. No interlacing, but TV stretches it and then most likely upscales it to the displays native resolution...
http://www.practical-home-theater-guide.com/3d-tv-formats.html
"... vertical resolution that is reduced by half as the images for the left and right eye are stored on top of each other in a single frame; this latter set-up is referred to as Top/Bottom 3D."
"The 3D processor inside the 3D TV will expand the corresponding half frame image into a full-size image for each eye in accordance with the native resolution of the HDTV. "
However the article was written in april 2010 and is wrong about PS3 using top/bottom. PS3 uses 720p frame packing format, which is similar to top and bottom but not quite the same. Its still top and bottom layout but no upscaling is done by the TV... PS3 has to internally upscale the image to 720p (if the game isn't running natively at that res) and double it in order to send 1280x1440 video frame containing both left and right frames...after which TV shows 1280x720 image to each eye.
