I had an old, spare LCD display (with speakers) sitting on my desk. Sadly it is VGA only (no HDMI, no DVI).
Because I got tired of switching my main computers display between RasPI and Windows I tried to find a solution on how to use the old LCD for the RasPI.
This is what I found: a HDMI to VGA adapter.
It works without external power and even the sound is working fine.