They could be used if they have a video input, but the image is crappy. If they're not VGA, which they're not, they're not worth it. As for any retractable screens, I have a good news and a bad news:
The bad news is the're aren't any
The good news, comes from www.digitalww.com. They have fold out, non motorized housings for the Xenarc and Lilliput (most VGA TS used around here).