You can buy a Princess Leia-style holographic display right now
The VX1 from Voxon Photonics is a volumetric display inspired by the game of holochess (aka dejarik) aboard the Millennium Falcon, as featured in Star Wars: Episode IV and The Force Awakens. This technology works as a 3D printer for light, creating images that can be viewed in 3D from any angle, without the need for special glasses.
The only downside is that it uses an oscillating screen so it has a protective dome so you can’t stick your hand in! (Also it costs about $10,000.) Euclideon have also developed a holographic table which is bigger but requires glasses.