> OLED screen.

Right. I would not expect it with an OLED since that is not polarized.

I came here to comment that Haidinger's brush is fainter than the light coming through from the Apple logo on the back of a Macbook 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.

Yup, that's them. It should look like this, only _much_ fainter:

https://en.wikipedia.org/wiki/Haidinger's_brush

(The blue part is a bit harder to see than the yellow.)