If you can use a TV, there are various brands of small LED TVs available in both the 13.3" and 15.6" screen sizes (Supersonic, RCA, Proscan, GPX, Axess, Naxa, etc). Just search Google for these screen sizes and they'll pop up.

I have a couple of the Supersonic 13.3" variants that i use as monitors via HDMI, and i set up a neighbor with a 15.6" Proscan last year. They work well and actually look pretty good, but they must be viewed from pretty much straight on as the image gets dark when you move off-center. They're also glossy and reflective, and i applied a Glarestopper film to one of mine that solved that problem (looks like a legacy matte screen now).