Re: laptop screen
Unless you have an electronics background, you're not going to be able to do this. It would require a lot of modifying of the screen's power inverter board, as well as changing the the ribbon cable that the laptop screen uses as an an input, over to composite (not going to be possible either, without heavy modifications to a [probably custom] circuit board).
Laptop: MSI GT70 2OC-059us | i7-4700MQ | 16GB | GTX 770m | 500GB SSD / 750GB HDD | 17.3" | Win10 Pro
Desktop: 4690k | 12GB g.Skill RipJaws | GTX 970 | 520hx | Z87X-UD4H | Corsair Vengeance C70 | Corsair H110 | Acer 25" | Acer 22" | Win10
Mobile: Samsung Galaxy Note 5
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