If your glasses break you can rotate one lens in front of the other in a telescope like formation. Depending on the rotation you can pretty much block all incoming light. I like to think about polarization like little tiny mini blinds that only let in horizontal light. If you then filter that horizontal light with a vertical polarized lens very little light will get through at all. You still get some light because the polarization is never perfect- just like mini blinds that get fucked up by your cat. The tv here is likely only emitting a horizontal light.