hes talking about detaching the screen from the laptop and ditching the base, being left with the lcd part of it, and using that as a screen so he can view what is going on with the carputer (essentially a pc installed in a car)
it is possible, but it is much easier and cheaper to get like a 10" lcd. you would have to get (or make) an adapter board, plus rig up a power assembly do light the backlight. just find something with vga or component inputs, or if all else fails, get one with an svideo or composite input and grab a video card for the carputer that has a svideo/composite output on it.
Carputer - Wikipedia, the free encyclopedia FAQ: Using a Laptop LCD as Your Car PC Screen - MP3Car.com
those are some links with some info and tips
and here is something that would be considered high-end, this is the easy way out:
Amazon.com: Lilliput 10.4" CAR Pc Touch Screen Lcd Monitor Terminals: Electronics