I'm told by Lin that her Nook can display pdf and/or plain text, and converters are available for converting other files types to whatever the Nook native format is. I haven't managed to get her cooperation to try anything with pdf images in it, but she has tried loading at least a couple of "books scanned to editable pdf" and "plain text from scans."

Results with our experiments on plain text weren't too satisfactory due to insertion of carriage returns at every line break in the scans by my program's pdf/OCR conversion to text. The multiple CRs prevent the Nook word-wrap from working and would require lots of editing to get rid of the line breaks without eliminating the paragraph breaks. I assume that the same problem would make scaling the text size difficult, but her subsequent cooperation has been limited to "don't touch any more of my books with your $!%#$# scanner."

The Nook does appear to have some indexing and jump-to-page capabilities, but she usually sleeps with (on?) hers and I'm fearful I'd wake her up if I tried to slip it out from under her nose to investigate.

Depending on what you want to display, I would expect that the Nook or Kindle would be more likely to do what you'd need than one of the digital photo display things, but unless you make some discoveries I haven't suspected, I'd expect easier results with the smallest notebook/laptop that gives enough resolution and look at conventional computer image/text display programs.

John