How to choose 3D glasses?

3D glasses are divided into three types

1. Spectroscopy: the different polarization angles of the polarized lens make the left and right eyes see the corresponding picture respectively. It is divided into IMAX system and RealD system, but the cost of IMAX system is higher, so RealD system has a larger market share, and RealD currently has more than 80% of the North American market.
2. Color separation system: from the earliest red and blue lenses to the current Dolby color separation system; the price is not high, but the red and blue lenses are eliminated in current theaters. If it is a red and blue color separation movie downloaded at home , You can use this.
3. Time-sharing system: it is the electronic shutter system. By alternately opening and closing the left and right eyes, the left and right eyes can see the corresponding pictures respectively. Xpand is an electronic shutter type, which is more expensive and has better results.