The rotation option literally rotates the display left or right so you can even it out how you want. It doesn't flip polarization.
The polarization is caused by the reflection of the image off the inside of the windshield. There's nothing projector adjustments can do to change that unfortunately, it's just physics. See: Brewster's angle
And does installing ceramic tint on the inside of the windshield have any deleterious effects on the HUD images?? (Just checking. Someone else said it didn’t.)
No effect on polarization. Just slowly rotates the image.
I don't know enough about the ceramic tint to really say, but probably not?
I understand polarization. Some manufacturers add in the ability to rotate the polarization of the HUD to work better with polarized sunglasses. Similar to how when you tilt your head side to side the polarization of the sunglasses gets out of sync with the light reflecting off of the glass and you are able to see it better.
With the way this HUD works, the windshield determines the direction of polarization, it's not possible to change it. Perhaps other manufacturers have a different implementation. Our Volvo HUD is the same as the Toyota, the projector is in the dash and projects an image up to reflect off the inside of the windshield to the driver, creating a polarized image. The rotation function tilts the image and has nothing to do with polarization direction which is determined by the angle of the windshield.
