I thought about this also,
but, (correct me if I'm wrong) I thougt that almost every display you are talking about were DSTN or maybe even STN screens. However. it could be that it is a TFT. (I just haven't seen any off them). So if it isn't a TFT than it would be useless for any video playback. only mp3's and navigations, but no games, tv, dvd/divx. because of the low refreshing rate the screen will drag.
You are right about the controller part, you just have to find a display that matches the pin-outs.
I didn't say it won'tSo now tell me - why won't this work?
It might not be usable for Video-playback.