A really interesting video showing the 3 major ones – LCD, DLP and LCoS:
Unfortunately its written in german (which I can’t read, hence the unfortunately), and I didn’t like the music much, but it’s really interesting.
Also, as a bonus, one explaining the DLP technology in detail!
There is a slew of projectors out there And I am sure that you will find one the fits your budget size,and likes. There is also a lot of controversy about projectors its bulbs etc….
Lets start by just looking at a few different types of projectors that might work for 3d printing.
1-Digital Light projectors.
2-Light Spectrum charts for DLP’s