I have an old LCD Duel Scan display, from a very old laptop. How hard would it be to turn the LCD screen into a monitor or TV screen to add to my computer.

very, you would have to find a way to power it and supply it with data to display, which means you need to make an interface (probably a parallel or serial port) and write some software, im sure it would be possible with a lot of work and some creativity

How about using it as one of those lcd pannels you find in your car.. would it work the same or completely different. Just wire up a vidio input to it

I have seen it done before, you better be really good with a sottering gun