have created an opportunity for a new wave of polarized 3D films. In the 2000s, RealD Cinema and MasterImage 3D were introduced, both using circular polarization. At IBC 2011 in Amsterdam RAI several companies, including Sony, Panasonic, JVC & others highlighted their upcoming 3D stereoscopic product portfolios for both the professional and consumer markets to use the same polarization technique as RealD 3D Cinema uses for stereoscopy. These highlighted products cover everything from recording, projecting, viewing and digital display technologies to live, recorded and pre- and post production facilities and soft- and hardware based product to facilitate 3D content creation. Their systems are interoperable and compatible with existing, passive RealD 3D glasses. Advantages and disadvantages Compared to anaglyph images, the use of polarized 3D glasses produces a full-color image that is considerably more comfortable to watch and is not subject to binocular rivalry. However, it requires a significant increase in expense: even the low cost polarized glasses typically cost 50% more than comparable red-cyan filters, and while anaglyph 3-D films can be printed on one line of film, a polarized film was often done with a special set up that uses two projectors. The use of multiple projectors also raises issues with synchronization, and a poorly synchronized film would negate any increased comfort from the use of polarization. This problem was solved by a number of single strip polarized systems which were standard in the 1980s. Particularly with the linear polarization schemes popular since the 1950s, the use of linear polarization meant that a level head was required for any sort of comfortable viewing; any effort to tilt the head sideways would result in the polarization failing, ghosting, and both eyes seeing both images. Circular polarization has alleviated this problem, allowing viewers to tilt their heads slightly (although any offset between the eye plane and the original camera plane will still interfere with the perception of depth). Because neutral-gray linear-polarizing filters are easily manufactured, correct color rendition is possible. Circular-polarizing filters often have a slight brownish tint, which may be compensated for during projection. Until 2011, home 3D television and home 3D computer primarily used active shutter glasses with LCD or plasma displays. TV manufacturers (LG, Vizio) have introduced displays with horizontal polarizing stripes overlaying the screen. The stripes alternate polarization with each line. This permits using relatively inexpensive passive viewing glasses, similar to those for movies. The principal disadvantage