Green digital picture frames, or lack thereof

Digital picture frames have their benefits and and pitfalls on the environment. On one hand, it saves paper, because photos don't have to be printed out anymore, but, on the other hand, the constant use of electricity seems unnecessary. After all, how much of the day are you going to spend watching hundreds of your own photos pass by? You could turn it off, but then what was the point of having it in the first place? You won't hear anyone yelling, "That 7" screen is running up my electricity bill!!" of course, but it creates an impact nonetheless, especially if the money isn't worth it.

The ideal would be solar-powered digital picture frames; they'd be saving trees, saving electricity, saving money. I searched for such a product, but the results were disappointing. I'm not making picture frames the top priority of energy conservation, but a solar-powered digital photo viewer would be a good product.