The short and simple answer is no. However a google of "Use Laptop as monitor" will bring up a few results. Problem is there is no practical or easy way to do it.
That's not true. The digital to analog converter for the monitor is build into the laptop motherboard, unlike being build into the monitor itself on a desktop monitor. You'll also need a power converter. The final answer is, yes you can, but it will be increasingly difficult to find a compatible DAC and a power supply.
Yes, that is true. I said the short and simple answer is no. I went on to say there was no practical or easy way to do it. I never said it was impossible. I suggested a Goole phrase to try for starters.
For someone who wants to spend the time and money yes, it can be done.
http://www.instructables.com/id/Laptop- ... d-Monitor/
Considering the cost of a flat panel monitor today I sure don't see this as practical. More like doing it as a novelty.