[Squidget]

Originally Posted by JustinHEMI

It has nothing to do with dimness. It's the physics of polarized lenses and how they work. And why changing the angle helps the HUD visibility.

In other words, it isn't a BMW HUD problem.

https://www.revantoptics.com/blogs/t...unglasses-work

Yep, HUDs have this problem, as do various kinds of displays that emit polarized light. A physics thing, not a BWM thing. Non-polarized sunglasses exist for this reason.