Ah, I see,
So, what you want is a 4 line display or something similar, which can take a "paragraph" of text, say 4 lines at a time (you will have to get a suitably spec'd screen), an SD card for storing your text file on and micro that can use a file system, the SD card can either be connected via USB through the micro and act as a mass storage device, or you can remove the SD card and put it into a PC card reader (most laptops have these as standard nowadays).
It wouldn't be overly complicated to implement this, given someone who has time, if you wanted it "miniaturised" or "tidied up" you will need to spin a custom PCB.