If you have a pre-OLED display which has an LCD inside it, you can remove the polarization foils on top of the screen itself. Make a pair of glasses out of the

If you have a pre-OLED display which has an LCD inside it, you can remove the polarization foils on top of the screen itself. Make a pair of glasses out of the layers of those polarization foils and then only you can see what's on the screen and everyone else is just seeing a white bright light. There's even instructables tutorials about this [1] so you can do this too :) I'd recommend to try it out on non-laptop screen first if you do this the first time, however. [1] https://www.instructables.com/Privacy-monitor-made-from-an-old-LCD-Monitor/ https://www.instructables.com/Privacy-monitor-made-from-an-o...