The Eizo DuraVision FDH3601 is a $35,000 desktop monitor featuring a 4,096×2,160 pixel resolution across a 36.4″ screen, a 16-bit lookup table supporting up to 278 trillion colors, a maximum brightness of 700 cd/m2, a contrast ratio of 1,000:1, and a response time of 8ms.
4,096×2,160 pixel resolution. That’s the equivalent of four 1080p displays.
http://www.eizo.com/global/products/duravision/fdh3601/index.html