This works way better than I expected. This is a static image test for a HUD on my home cockpit using a dead cheap beamsplitter made of plexiglass and a smartphone.

This works by placing a smartphone (or really any kind of fitting display) below it. The beansplitting characteristic allows some of the light to pass through and will mirror whatever is on the phone display below it. The image is inverted though so a HUD mode requires an already mirrored display mode. There are apps for this but since I use HTML for all my GUI stuff I can probably just use CSS for this task. Most of the work was finding out how to get Firefox to do fullscreen (which can be requested via JS from a user interaction - so it has to be some sort of clickable element) and get it to keep the display always on.

A more advanced build would use a beamsplitter glass. This thing here is "designed" for cars and is according to the review a really bad product because it doesn't work well with day light or likes to slide around. All problems my desk does not have, of course, so I got this on a whim to see how it would look and I'm mind-blown with the result already 🤓 What do you think?

Originally noted at https://beko.famkos.net/2024/09/06/15629330/