Use laptop lcd as extended monitor

Slim to none. I've never heard of anyone doing this. I imagine the cost of getting something like this to work would exceed the cost of a new monitor. Sorry.

There are hardware adapters available which allow you to use a video input for your laptop screen

they are usually made for composite input so you can play games on your laptop screen, and some are relatively cheap.....i don't see why you couldn't use a converter and then use this as another computer monitor....the issue though is that your desktop has to render the image to output it to your laptop, whose graphics card has to then rerender it to be displayed on the screen......quality goes kaput

uh_no, your product won't do anything to help the OP. That thing is designed to take video as input and output it in USB, then reform it to video using software. This doesn't do anything for a notebook that doesn't work in the first place.

this is a VERY interesting topic to me, as I have like 15 LCD screens from old laptops.

Anyone actually knowledgeable / experienced with this, please answer my question...

How hard would it be to have a 'wall of old LCDs' aka, combining them. I assume that this would be very difficult and finding the right encoding for each individual inverter would be extraordinarily tedious.

Would be cool though...and I have some ideas as to some experimenting with combining displays that would be fun....