I use a PocketBook 912 Pro (which is an ebook reader). The display is almost 10" and that is large enough (even too large for, e.g., SIAM papers, but zooming in persistent). Reading is great, reading outside in the sun is even better. The battery is great; I use it for more than a month now and I did not need to charge it (the small time I connected it by USB to upload paper was enough). The stylus allows you to highlight and scribble on papers. DJVU is supported.