Actually, i got tired of the scrolling problem, the last one i used was took from a double dvd player kit for the car, like that:
http://www.walmart.ca/en/ip/sylvania-7- ... 0006659266
You have a portable dvd player, and there's a second screen coming with it, the second one is just a screen with speakers that you connect to the dvd player with an a/v jack cable, so you can disassemble it and solder straight to the points, really easy to do, plus the board is small and the screen can run off 7.4v, tested! (And you have speakers with it, so no need of any amp)
I found mine in a pawn shop for 50$ brand new, and i still have an extra portable dvd player for my car
The screen power up automaticly when you input the power in, you have controls for volume directly on board with headphones jack, and another board with contrast control, which is great, you can put it somewhere else in your casing!
Here's a few pics i took while testing the concept:
If you have questions about it don't hesitate!