[Bitluni] has been experimenting with resin printing lenses — in particular, lenticular lenses. You’ve probably seen lenticular lenses before in 3D greeting cards or children’s books. By presenting a slightly different image at different angles, your eyes perceive stereo vision giving the illusion of depth. You can see his results in the video below.
Honestly, even if you don’t want to make a display like this yourself, the demonstration of how a lenticular lens works using a laser is worth watching. Sure, you know in theory what’s going on, but seeing it visually exposed is great.
The display isn’t going to replace special effects in the next science fiction movie, but it is still pretty cool. A grid of 138 lenses and some software give a fairly credible 3D effect, at least as far as we can tell watching it on 2D YouTube and listening to his excitement upon trying it.
The final product fits in a cover that fits over a smartphone which drives the display. We were interested in the use of straight-up resin to make the back surface flat, which is an interesting trick.