Most Laptop LCDs are properitery, and are not easily interfaceable with desktops. First of all, the interface in most cases is digital, not analog, as well as most Laptop LCDs are missing the converter that is needed from going from VGA to LCD.
However, some laptop LCDs may use a DVI interface, but again to fit into small space, the wiring will be quite strange, and the pinouts may not match at all.