Quote:
Originally Posted by Powderfan
It's an inherent part of the technology. The only reason you can see the HUD reflected off the windshield to begin with is because of polarization. By wearing certain polarized glasses, you're effectively cancelling out most of the reflected light(the display) coming to you. There are some ways around it, like your head/glasses orientation relative to the hud, and there are some brands/lenses where the polarization is aligned in a way that doesn't cancel out the HUD. It all depends on whether the display and your glasses are polarized in the same direction or not, which usually it will be because most glasses are polarized along the same axis.
A quick tip is to find transparency film and apply it to the hud(also works on radio displays and nav screens if you have trouble seeing those as well. This rotates the polarization angle 90 degrees so it will be in step with your glasses and therefore you wont cancel out the reflection.
Read this to understand the science behind it http://en.wikipedia.org/wiki/Polarizer |
Thanks for the explanation. I'm familiar with the polarization process for sunglasses, but didn't realize the HUD relies on the same concept. Some polarized glasses make the radio screen in non-iDrive cars unreadable, and the transparency film fix works well for that. Never would have thought to apply the same concept to the HUD.