Today a look at passive full color 3d systems.
0-90 Vertical and horizontal polarizers, one for each eye, are common at traditional IMAX film-based theaters.
45/135 This version is the standard and is used in most theme park attractions as well as digital IMAX theaters. It offsets the 0-90 polarization by 45 degrees.
REALD A flippable Z-screen, with the circular polarizer is placed directly in front of the projector lens. This system is designed for single projector digital presentation.
REALD XL A beam splitter is used to capture potentially lost light, resulting in a brighter 3D image.
REALD XLW This is an offshoot of the REALD XL, designed for screens up to 80 feet in width. It was introduced on the IMAX screen at Moody Gardens, Galveston, TX.
REALD XLS The XLS is designed for SONY’s SXRD 4K projectors. It uses a special lens designed by SONY that splits the image into two 2K images.
DEPTHQ The DEPTHQ polarization modulator uses liquid crystal technology (akin to active glasses) that creates a brighter, flicker free, presentation than other circular polarized systems. It can be used with reusable or disposable glasses.
MASTERIMAGE uses a rotating circular filter placed in front of the projector.
TECHNICOLOR A low cost solution for 35mm film theaters, Technicolor 3D uses the over/under approach pioneered in the 1960’s, combining with it circular polarization.
DOLBY An Infitec color wheel is placed inside the projector. In addition to the color wheel already found inside a DLP Cinema projector, this new wheel creates a second series of RGB-based color gamuts, but are transmitted at a different wavelength than the DLP color wheel’s. The images are refined to each eye through dichroic filters on the glasses. This system is used in a number of movie theaters and is being applied to a number of theme park attractions, including Star Tours and the upcoming revamp of The Amazing Adventures of Spiderman. The glasses, however, are on the expensive side.