Ask Mosquito on TheModZoo forums. He made one a few years back.
edit: Whoops didnt realize the link above was to his mod lol.
If you want the simple guide:
1) Find a simple monitor
2) Gut it
3) Keep only the Panel, polarizing filters, and panel controller
4) Attach Panel, Filter, and controller to side panel.
5) Put in a lot of white LED's to work as backlight
6) Run HDMI/DP/DVI cable out the back and into a GPU/Motherboard
7) ...
8) Profit
USB monitors work VERY well for this if you have the money to throw out. Just be careful as they can break relatively easy. Did a mod like this a year or two ago to incorporate into my Acorn build, but I couldnt get enough light into the case to be able to work as the backlight. You need something on the scale of a professional camera light source for it to work due to it not having a back plate to reflect light off of.