Forums | MacLife

To quote AppleFritter.com's information on the subject

Q: How do I turn this laptop screen into a monitor?

A: Put simply you don't.  Whilst it is possible to use a laptop screen as a monitor it takes a large cash investment and a good understanding of electronics.  If you are lacking in either of these departments don't bother, buy a cheap LCD with VGA connection on eBay instead.

If you really want to know more about using a laptop display on another computer then do a search of the [AppleFritter] hacks sections with 'holy-grail' as your keyword.  You can also try visiting Earth LCD for more info regarding the required convertor boards. 

Here's one of the best explanations of why using a laptop LCD for a monitor is a difficult project I've seen so far, courtesy of Eudimorphodon:

Laptop displays simply don't speak the same language as CRT monitors, electrically speaking. It requires a complex wad of electronics to turn output meant for a CRT into input suitable for an LCD, and that wad of electronics is referred to as the 'controller'. You won't find a controller you can salvage in your laptop anywhere, because it 'speaks LCD' directly, and thus doesn't need one.

It's not just a matter of pasting wires together, which is what everyone wants to think. Those controllers sell for anywhere from $150 to $300, and for most installations require custom cables and power supplies which may well run you another $150.

Sorry.  Your best bet is to buy an LCD panel off of ebay, that has the inputs you need, and use that.