polarization glasses
In 3D projections, two-dimensional images are given a stereoscopic impression through perspective information. There are various methods for separating the two images for the right and left eye and making them visible to the pair of eyes separately. This can be done by projecting the images for the right and left eye in different wavelengths or by polarizing the projected light in different planes.
In the polarization technique, the light is polarized in two planes offset by 90 degrees by polarizing filters located in front of the projection lenses, and both images are projected onto the screen. In practice, polarization takes place at 45 degrees and 135 degrees. Without technical aids, the viewer sees the two differently polarized images on top of each other as a 2D projection. The separation of the two images or image sequences is achieved with polarization glasses, also called polarization glasses, whose two lenses allow the light of the different polarization planes to pass through. For example, the left eye sees the image polarized at 45 degrees, while the right eye sees the one polarized at 135 degrees. He thus sees two images that differ slightly in perspective. The eye, or the brain, integrates the two images into a stereoscopic representation with depth effect.
This polarization technique is mainly used in 3D cinemas and in home theaters, but it is also available for 3D displays. It is used in computer games and virtual reality( VR).