The PSone screen is widely used on BenHeck by myself and other modders, as the screen is of good quality, good refresh, takes RGB and composite video (or S-video and RGB with a simple hack) and 5" which is a good size. It also takes stereo audio, has a built in audio amp, reasonable video definition (320 x 240, 640 x 480 interlaced). The system is easy to open and mod, and runs on 7.2-9v, about 750mAh with unmodded screen.
They have been used for console modding
, connecting to VGA and used on the front of a computer, playing video from camcorders or even as a digital picture frame.
There are guides on the BenHeck forum on Portable Screen Hacking, but if anyone needs further assistance, please post questions. I have learnt a lot about using these screens in projects and happy to assist if you have any queries.
They can be bought still on e-bay. I have a few of them for projects, got them all off e-bay.