If you're making a portable you probably need something to watch it on. (Unless you want to guess what's happening in the game, but I wouldn't advise that) Anyway, this forum is your "Hacking a pocket TV/screen" one-stop solution. Share your experiences and knowledge here.
If you go on eBay and look for portable DVD players under $30 dollars, there will be a whole bunch of broken DVD players with great screens! You also get one of those li-ion batteries for a good price.
Unless a dvd player uses some other kind of weird digital video signal or something! Then it's useless!
And then the first human typed up '1337'. Faith in humanity soon plummited.