Dell XPS One LCD Panel Manufacturer?

Presuming you don't want to open it up (which might not help anyway; I don't know whether the panel manufacturers print model numbers on the edges of the panels), if you have a manual with specifications of the resolution, response time, contrast ratio, brightness, viewing angles, and whether it uses an LED backlight, you might be able to narrow it down by comparing those with the specifications listed in TFT Central's Monitor Panel Parts Database:
http://www.tftcentral.co.uk/articles/monitor_panel_part...