The iPad’s retina display offers one of the most pixel-dense screens you can buy, but unfortunately it’s attached to your iPad and can’t double as a high-resolution display for your PC. That is, unless you buy the part and convert it like Andrzej, an engineering student in Warsaw.
Andrzej found out that the display’s part number was LP097QX1-SPA1 and found one on eBay for just $55. With a few experiments and some advanced wire-splicing, he was able to hook it up — at full resolution — to a standard PC with a standard DisplayPort connector. The DisplayPort connector was enough to power the screen, too. If you want to give this a try yourself, check out the full detail’s on Andrzej’s post.