Two summers ago I bought an iPad 3 LCD off ebay. These are 9.7" 2048 x 1536 IPS panels, which use an internal DisplayPort interface. In May, I finally got around to building an external display out of the panel, which can be clipped directly onto the side of my Macbook Pro's screen, and is powered by a USB port.
I have been using the display on a daily basis for the last four months, and it has held up beautifully. It took a little while for my eyes to get used to the tiny 264 pixels-per-inch pixel density, but I can now comfortably use it at native resolution.
The display's build log can be found here.
