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Comment by diminoten | Hacker News Reader

It doesn't solve the #1 problem all HUDs have to solve - view obstruction. That's a very significant portion of your view being effectively removed by the scotch-taped + suction-cupped piece of glass which should be transparent.

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There is a reflective tape you buy specifically for cars that came with HUD from the factory. You could also measure the tach signal for a tachometer too.

(http://www.ebay.com/itm/Head-up-display-OBD-II-HUD-S-200-Typ...)

From the pictures it looks like the projection is focused on the film (also true for OP's link), where as in newer HUDs (such as my 2013 BMW) it looks like the projection has infinity set as the focus thus achieving the result of it looking like it's floating in a distance, and I don't need to adjust the focus of my eyes to look at the contents of the HUD. But I have not reviewed the tech spec, it just seems this way and the videos/pictures in OP's link and your link look way too jarring.

OP uses a fresnel lens and gives instructions on how to focus the HUD at infinity to avoid this problem.

Hey I'm Bill Wong, the guy that wrote that blog post. The glass on this design was mounted with suction cups (no tape) and placed about where the tree line is in the driver's field of vision. I didn't feel it was obstructive for normal driving, but it did sometimes get in the way when looking or turning left.

I'm still working on this project, and I hope to solve this issue in a future design. Any suggestions on how to securely mount the glass without obstructive supports?

Exactly, unless the cars already drive themselves, this would always be considered dangerously distracting in the best case scenario.

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