Maybe it depends on the screen type. I can see it very clearly on my macbook LCD screen, but I can't see almost anything g on my Samsung S4 OLED screen.
I'm having a hard time finding the orientation of my phone. I can see yellow artifacts but they're not coherent like on other LCDs. And when I look through polarized sunglasses there's no blocked angle. It must be using some alternative polarization even though it's a regular TFT screen.
There's certainly a value in not having your phone screen dimmed by sunglasses.
Right. I would not expect it with an OLED since that is not polarized.