How does this see-through display work?

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These smart swimming goggles have some kind of see-through display that I would like to replicate for a diy project, is anyone familiar with this tech and knows what it’s called?

Here is an image and the product page:

[https://media.wired.com/photos/5d574880017c5c0008bdec4e/master/w_1600%2Cc_limit/gear_goggles_hud.jpg](https://media.wired.com/photos/5d574880017c5c0008bdec4e/master/w_1600%2Cc_limit/gear_goggles_hud.jpg)

[FORM Smart Swim Goggles (formswim.com)](https://www.formswim.com/products/form-swim-goggles)

Thanks for the help!

In: Technology

2 Answers

Anonymous 0 Comments

They’re most likely liquid crystal displays. The pixels in LCD displays are transparent when off, but turn opaque when energized. The LCDs in things like calculators have a white background behind the clear display element so you can have a contrasting color to see the digits.

Anonymous 0 Comments

These types of displays usually project light on to a prism that reflect the light in to the wearers eye.

[Here’s a tear down of Google Glass](https://youtu.be/ZoykraDJ-7o), showing the display and prism at around 12min30sec