Parts required to connect laptop LCD to portable DVD player

so you're trying to connect the video out on your portable dvd player to the lcd screen of a laptop. 99% of laptop don't have video-in, so this isn't going to work. And if they did, you'd have to turn the laptop on, at which point you might as well play using the dvd player of your laptop (unless you don't have one, like myself.) But, then, at that point, just rip the dvd and compress it and stick with having one device. If (when) you don't have a laptop with video in, you're going to have to do some opening of the laptop and trickery with the actual chips, which will kill your warranty and be a totally non-portable solution.

My point: this is a bad idea and not worth doing under any scenario that I can think of.