Laptop screens are great as long as you have a fair few hundred $'s to throw at it. They are the best quality wise (beating composite inputs hands down) and are dirt cheap to get the actual screens (often sub $100). However, you need an LCD controller which is the expensive bit. On a laptop motherboard, the LCD controller is intergrated and therefore can't be used. Your options are to buy an inline LCD controller (like the allen rubble controllers that were sold on the board a few months ago) which accepts vga input and converts to LCD, or to buy a PCI LCD controller (which features a built in graphics card). As there are no more allen rubble controllers (doh!) you are faced with at least $300 for a controller. For me this is not an option, so I'm going to fit a 15 inch TFT desktop monitor in the car for people to watch films on and eventually a 7" widescreen redant display in the front for GPS. When I've finished robbing banks to pay for it...
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Cheers - Good luck with your install
Mediabox Hardware Project
Current Stage: A complete redesign, although not much happening right now!
Mediabox Software Project
Status: Writing Sync Software (still) and playing around with interface
To do: Far too much!