Why are 3D glasses different across cinemas?

- Apr 03, 2020-

In recent years, more and more movies have begun to promote the 3D version. As consumers are naturally willing to see more new technologies popularized, but cinemas often do not give us the right to choose, and many movies do not even have 2D versions. And when the cinema no longer provided 3D glasses for free, we started to need to bring our own or buy 3D glasses on the spot, which in turn increased the cost of our movie. And after a while, I found out that 3D glasses in some movie theaters are not universal. Why?

In the final analysis, the main difference is the 3D technology, which results in different 3D projection equipment and 3D glasses in cinemas. At present, most domestic 3D movies are realized by polarized 3D technology, but they are also polarized 3D, and the polarization methods of different homes are also different. They are mainly divided into circular polarization and linear polarization. RealD 3D, Dolby-3D, IMAX 3D, Chinese giant screen, etc.
The 3D glasses using circular polarization technology use left-handed polarized light and right-handed polarized light to achieve 3D stereoscopic effect. Because the interference between polarized light in the two rotation directions is very small, it will not cause 3D due to viewing angle The effect diminishes or disappears. In addition, the cost of circularly polarized 3D glasses is very low, which is currently a widely used polarized 3D technology in China.
The effect of circularly polarized 3D technology on the display
However, the shortcomings of circularly polarized 3D technology are also obvious, that is, the 3D effect is slightly worse. The RealD 3D mentioned above is a kind of circular polarization 3D technology. Domestic Feodio also uses circular polarization 3D technology. The two 3D glasses are not necessarily universal.
Linearly polarized 3D technology uses different polarization angles to let the screen on the screen enter the left and right eyes respectively to achieve 3D stereo effect. For 3D glasses with linear polarization technology, it is necessary to determine which content on the screen enters the left eye and which content enters the right eye. This will cause a problem: some cinemas choose to give this part to the left eye, and the other part to Right eye, and some theaters are just the opposite. At this time, in addition to repurchasing new glasses, you can also try to wear linear polarization 3D glasses in reverse.
The characteristic of linear polarization 3D technology is that if you don't look directly at the screen or the viewing angle deviates, you will find ghosting on the screen, but the advantages are also obvious, that is, the 3D effect is very good. In addition to ordinary 3D movies, IMAX 3D also uses linear polarization 3D technology.
I also want to mention IMAX 3D here. Although from the perspective of the viewer, compared to ordinary 3D cinemas, it seems that the screen is a bit larger, but the technology inside is actually very different, which is why Generally we go to watch IMAX 3D movies, and cinemas basically provide glasses for IMAX 3D.https://www.gift-package.com/