While resistive touch displays aren’t quite as finger-friendly as the capacitive touch displays found on most smartphones released in the past 15 years, they do work nicely with a passive stylus.

Okay, first off, yes there have been so-called 'holographic' displays created with smartphones before, the most infamous example of which was the ill-fated RED Hydrogen smartphone. As far back as 2015 ...

The Nokia G22 smartphone comes with components you can easily dismantle and offers a repair manual from iFixit.

DIY Apple Studio Display uses 2014 iMac to save $730 YouTuber strips old iMac of its components and turns it into a 5K monitor.