HUD polarization 180 out with polarized sunglasses
Thread Starter
Joined: Jan 2015
Posts: 835
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From: Auburn, CA USA
2016 S63, 2013 SL63
HUD polarization 180 out with polarized sunglasses
I just got a new windshield on my 2016 S63 and it is HUD 180 degrees out. My last S63 and the previous windshield worked fine. My local MB dealer says that's the way it is.
What say the world?
TIA,
Vince
What say the world?
TIA,
Vince
Out Of Control!!
Joined: Nov 2018
Posts: 11,403
Likes: 5,325
From: San Francisco Bay Area
2019 C63CS
HUDs do not work with polarized sunglasses period. Polarized sunglasses filter out horizontal reflections, which is all the glare and reflections that come off the windshield. The HUD image is also just a reflection/glare of the windshield being reflected horizontally as well. There's no way to change that. It's how light reflects off a surface, and the whole point of polarized sunglasses is to filter out these reflections, because they are generally undesired. This is the main reason why I skip HUDs. I prefer polarized sunglasses here in California living by the ocean with all the sun reflecting off the water. I'm not gonna change my sunglasses to see a HUD. It's a fundamentally flawed technology in my opinion. If the inside of your windshield is dirty, then you may see more of the HUD, because the reflected light gets scattered by the dirt. I also don't really like something floating in my line of sight. I find it annoying, which is partly why I wear polarized sunglasses to get rid of all the glare and reflections of the dash in the windshield.
Out Of Control!!
Joined: Nov 2018
Posts: 11,403
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From: San Francisco Bay Area
2019 C63CS
Something else must be going on. The polarization of the reflected light from the HUD can't be changed. It's always horizontal to the surface. Can't change physics. Did you change sunglasses perhaps, and your previous ones weren't actually polarized, or they were polarized the wrong way?
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Out Of Control!!
Joined: Nov 2018
Posts: 11,403
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From: San Francisco Bay Area
2019 C63CS
Don't know their sunglasses, but the only other thing I can think of as I mentioned above is that your previous glass may have had deposits/dirt on the inside. Over time there's a film that builds on the glass from the gassing out of the plastics etc. If the glass isn't smooth, or there's dirt on it, then some of the light can get reflected vertically and will make it through the polarized sunglasses. Maybe this time, they properly cleaned your glass.
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Out Of Control!!
Joined: Nov 2018
Posts: 11,403
Likes: 5,325
From: San Francisco Bay Area
2019 C63CS
Yep, that would most certainly change the reflective properties. You get light refraction as it travels through the tint film and then into the glass.
Last edited by superswiss; Sep 9, 2021 at 04:36 PM.
