LCDproc displays real-time system information from your XigmaNAS server on a small LCD screen. The server supports several serial and USB LCD devices. More info can be found here: External Link
This is a screen build into to an XigmaNAS server.
You could buy cheap screens from here check: http://www.lcdmodkit.com/lcd/U204FB-A3.html
Below the WebGUI lcdproc configuration page: