Holographic displays sound very fancy but you can build various simple types yourself at home. [Julius Makes] whipped up a neat design that shows a different image depending on the position from which you view it.
Running the show is a Wemos D1 devboard equipped with the ESP8266 microcontroller. It’s hooked up to a pair of OLED displays over I2C. The displays are placed in a 3D printed assembly that aims each one at a beam-splitter cube. This bounces light projected into one face through 90 degrees, and out another face. By leveraging this, it’s possible to aim each display at one face and bounce it out another, such that looking at either side of the beamsplitter cube shows a different image. Since the beamsplitter cube also allows some light to be transmitted directly through as well, the image from each display appears to float in space.
[Julius] notes that this setup is being used in a puzzle box game, while wondering whether there’s any other fun ways to leverage this technique. We’ve seen some other neat holographic displays before, too, like this neat Holochess build.
Drat, not actually a hologram. Actually yet another Pepper’s Ghost.
does not meet the definition of an hologram:
A hologram is a recording of an interference pattern that can reproduce a 3D light field using diffraction. There is no such a thing like a “2-way” hologram.
If this is a hologram then my grandma is a bike.
Can I get a ride
I did not realize that there was a mirror for a while because the displays showed different views. What an illusion! I just thought there were two tables and two displays. Great Job.
College boys… Not everyone has degrees, or learned precise definitions. There are a lot of words misused. We all have a limited vocabulary. We pick the words we have, the best describe a thought. I had no problem deciphering the intent. Not a bad project idea, and thanks for sharing. Not sure how useful, or cost effective do to size. Maybe a desk clock. Something to think about, which is sort of the point of proof-of-concept projects. I’m glad to see people post their ideas. Least they are building things, just for the sake of seeing if it actually works. Most educated people limit themselves to what they learned in books.