What is the principle of 3D video playback for active glasses?

Question

Video

Good evening, please tell me what is the principle of playing 3D video on TVs with active technology in FULL HD format
, as I understand it, glasses have the principle that they are synchronized with the TV, and both devices (TV and glasses) begin to change polarization with a certain frequency as screen / lenses at the same pace
, but it turns out that the TV must set a certain frame for each polarization, as I understand it, it must do it very quickly so that it is not noticeable OPENLY blinking
i.e. TV should have time to cut video size 3840x1080 into 2 parts and paste at a certain moment,
can't TVs with active technology have time to cut frames of such a resolution with such a frequency?

Answer 1

The chip of active technology is precisely that the refresh rate of the final picture is just two times lower than it could be.