ASUS has launched the first consumer-oriented ultra high definition monitor called the PQ321. For this monitor ASUS has chosen to use an IPS panel, which is nothing special in itself. What makes this monitor stand out is the new pixel technology used that substitutes the usual silicon pixels with Indium Gallium Zinc Oxide (IGZO). IGZO has a 40 times better electron mobility compared to silicon, thus making it possible to create transistors much smaller, which in turn allows for denser pixels.
It has a resolution of a staggering 3840x2160, which gives it an aspect ratio of 16:9. That is the same aspect ratio as the standard high definition resolution of 1920x1080, so scaling between the monitors should be relatively easy. The monitor is 31.5 inches diagonally, giving the monitor 140 pixels per inch. It may not sound like much compared to some of Apple's Retina displays, but as soon as you are sitting a couple of feet away from the monitor, the ASUS should win on quality in that regard. What also might be a win for many graphical designers, photographers, and the like is the support for 10-bit color. The rest of the specifications include a gray-to-gray response time of 8 ms, 350 cd/m2 brightness, 176-degree viewing angle, one DisplayPort, two HDMI sockets, built-in 2W speakers, and a thickness of 35 mm.
ASUS has chosen to give the monitor a retail price of $5,000, so it might be some time before consumers actually get hold of monitors like this. And should you desire to game on one of these, I doubt that even four GTX Titan cards would be sufficient.