In this connection one should keep in mind that the single camera, single projector simultaneous cross polarized technique used so successfully with 3D film for over 30 years may again appear for 3D video. LCOS and other modalities already have 4Kx2K resolution so a split lens with top/bottom images will give a 4Kx1K pair, sufficient for modest sized cinemas. SONY has recently started using a split lens for projecting LCOS 3D. It is well known that split lenses for cameras and projectors, either top/bottom or right/left, have been widely used for 3D for some 50 years. If one uses anamorphic lenses to film and project (e.g., as the standard CinemaScope format for theatrical 2D has done for decades), then one does not need to throw away any pixels or use complex image-degrading codecs. Anamorphic lenses have often been used for video and SONY even sold them for use with camcorders and consumer projectors a decade ago. I have described many of these formats for 3D in my previous articles and there are whole books and websites devoted to widescreen.

It is feasible to use a single imaging chip of 8Kx4K with high brightness lamp and high quality lenses to compete in terms of image quality and cost with the other projection approaches, and to create hires single chip or dual chip or frame sequential 3D lenses for video cameras that will avoid the horrific problems of matching all parameters of twin cameras.

CP and LP switching by multilayer LCD plates was specifically patented for 3D by many companies including StereoGraphics, the company I started in 1979, and marketed by them under the name “Z-Screen”, sometimes called “Z-Filter”. LCD shutter glasses and CP switching screens were originally developed and marketed by Tektronix in the 70’s and, after poor management destroyed their LCD division-- the USA’s finest LCD R&D facility--it was licensed to NuVision of USA and Delta of Taiwan. Independently, various companies worked on this, including the Japanese petrochemical company Idemitsu, who released an all plastic version (i.e., no glass whatsoever) that I used for some time in the late 1990’s (EP 0892563 A2 (1999)). A few years ago ColorLink began marketing one and Real D (the new name of StereoGraphics after some Hollywood hotshots bought controlling interest in 2004) solved the problem of competition from a superior product by buying ColorLink ( http://www.reald-corporate.com/story030807.asp ).

A little known aspect of this history is that Tektronix was sued by LC pioneer James Ferguson over pi-cell patents, and, despite assurances from their patent and tech staff that they would win easily, they paid him off rather than pursuing it, since they had a lucrative business selling high end devices such as time domain reflectometers and they did not want to interrupt the cash flow. Possibly this enabled StereoGraphics Corp. to survive since Tek might have sued them for patent violations.

One of the most surprising films at the show was Mummies 3D, which I saw at the Singapore Discovery Center in an SimEx-Iwerks theater, which uses their single projector 8 perf/frame above/below 70mm film and 7000 watt xenon projector with their own brand of 20x15M silver screen and CP glasses.