So I dug up the display which I used 3 years ago, and the test image I uploaded with my Raspberry Pi project for another project I was planning, is still as clear as on the first day, and there was no power for these 3 years. That's amazing!

Next for fast prototyping, I'll try to connect it to my NodeMcu module. This is a nice little ESP8266 WiFi module, which can execute Lua code, even over the internet. This makes development really easy and turnaround time fast, as I demonstrated here