Basically half of the pixels have a narrow view angle, the others don't, when you activate the privacy mode, only the narrow pixels remain, so you can see the screen only looking straight.
I got this explanation for the mkbh video: https://youtu.be/nfHRMqqO578?t=141&si=iEhVrdCuLN0fkasd which illustrates it very well (2m24 if timestamp doesn't work)
Theyre not polarized, the pixels are recessed so that the light only goes forward
I wonder if this is how those privacy screen protectors work. Where it's just like looking at the screen through a cell structure with walls that prevent light coming out at an angle.
Right ! My bad