I build a digital picture frame using an 8-color e-ink display and a pi pico.
It works great within its limitations, but the limitations are still pretty big
- 8 colors is pretty limited, especially when it’s a specific 8 colors (not just 8 max).
- Refresh times are slow
- The pico memory and storage are limited
- Due to the above, mine ran in two cycles with a reboot between to clear memory. One to pull images from my website and another to cycle through existing pictures until it needs to grab more
- Images needed to be converted to the appropriate size+ 8-color palette and dithered etc beforehand into a format the pico can read (hence then being on my website where they were reduced to an uncompressed palletized BMP)
Obviously a commercial product could probably do better, or a better screen, but faster-refresh or higher-color tends to jump in price quickly.
Still, it was pretty cool to have a device that would not need power to persist images, and used only a little during the process of loading new ones so could be powered by battery/solar
I’ve thought of doing something similar, the other fun part is that you could stash a big battery behind the display and run the E-ink on a super slow refresh rate since they only use power to refresh. I wish E-ink wasn’t so ridiculously expensive. This monitor would be perfect if it weren’t $1200.