Much as I like tinkering, I don't want a cobbled together raspberry pi plus lower power mamagement module with some alibaba special screen, all wrapped together with duct tape. I just want a nice looking consumer grade device, maybe 8x6" or thereabouts, reasonable resolution, grayscale is fine if necessary, an sd card slot where I can stick a load of jpegs and let it run with a photo change or two a day, with about six months in between recharges.
Is that too much to ask?
I'm sure the first company to do this is going to make a killing.