August 2023 purchased a Inky Impression. Been running a slideshow on it since then, with pictures changing every 30 minutes ( more or less,I have adjusted the timing over time). It has developed purple tint all around the edges. I am not sure if it’s getting worse. The pic attached tries to catch that.
Same here, I think the quality deteriorates over time. You can try to flip through different border colors, maybe this helps refreshing the screen a bit.
If you do find the time to test set_border(color) it would be great if you would report back. I currently don’t have the time to explore this, but if it works, I would probably change my setup to pick a random border color on every update (or something similar).