This might not be exactly what you're looking for but it might work so I thought of posting anyway. They make some LCDs with built-in DVD players that you might be able to use, as in creating the video or slideshow on a DVD and then just looping that. That way you don't have any computer or external box hookups. I don't know for sure if they have any that are the size you're looking for, but they also have some TVs that have a memory card slot for doing slideshows and things like that. Anyway, just a few ideas if you can't find anything else that would work.