There are different techniques for 3D projection but the bases is the same. An image is displayed for the left and another image is displayed for the right eye and our eyes make this into a three-dimensional image. Stereoscopic 3D is the technique of creating depth in an image by using a separate image for each eye.
Active 3D or Passive 3D
Before choosing the correct projector surface to use you must first find out which type of 3d projection system you are using, Active 3D projection uses a single projector that rapidly alternate between displaying the left eye image and the right eye image. This frequency is coordinated with a pair of shuttered glasses which block the light to the opposite eye at the same rate.
With Active 3D the projector and glasses making sure each image is displayed to the correct eye, so practically every projection surface can be used, however because of the filtration process loss of light/brightness occurs therefore a higher surface is recommended to offset that affect.
Passive 3D projection systems usually have twin projectors, one for each eye's information, passive 3D projection does not required expensive shutter glasses, but does require polarising filters and projection surface with polarisation retention to separate the two different signals. These differences in orientation are used to project different signals. Polarisation retention is the ability of the projection surface to retain the orientation of the signal and preserve the polarisation.
Silver Lite 2.5 (front projection)
A multi-purpose front projection surface that is optimized for passive linear and circular 3D applications and is also an excellent 2D screen material. For passive 3D applications, the silver surface maintains 99.3% of polarized light and the 2.5 gain of the material compensates for the light lost in the polarization filtering process. The polarization retention and high extinction ratio eliminate the ghosting or crosstalk common with stereoscopic 3D projection. For 2D projection, the gain and high contrast characteristics of the material make it perfect for projection in high ambient light conditions or for use with a low output projector. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant.
Viewing Angle: 25°
3D Virtual Grey (front projection)
Designed specifically for passive stereoscopic 3D front projection systems, 3D Virtual Grey is a flexible projection surface that retains 99 percent of polarized light. Other characteristics include the ability to maintain high extinction values, virtually eliminate ghosting or crosstalk common with stereoscopic 3D projection and excellent image contrast.
• Gain: 1.85
• Viewing Angle: 22°
3D Virtual Black® (rear projection)
Designed specifically for passive stereoscopic 3D rear projection systems, 3D Virtual Black® is a flexible rear projection surface that retains 99 percent polarization. This fabric maintains a high fidelity 3D image and virtually eliminates all image ghosting. The black surface finish provides excellent image contrast and its 3.0 gain offers exceptionally vivid images even in ambient light conditions.
• Gain: 3.0
• Viewing Angle: 20°