Asus has announced the Ultra HD screen (3840 x 2160) with a diagonal of 31.5 inches, the PQ321. This screen should be the first 4K model (although in fact it is not Ultra HD and 4K ...) sold in the United States, with a release date scheduled for the end of June.
The screen thus has a high definition panel, in IGZO technology and an LED backlight. Asus announces a response time of 8 ms, a brightness of 350 cd / m² and does not indicate the contrast ratio. With a resolution of 140 dpi, the display of small text, but should remain legible.
Connecting to a computer screen that is obviously the main problem: it includes a DisplayPort input and two HDMI 1.2 inputs only. In the first, the native resolution is available, but the DisplayPort 1.2 compatible graphics cards are not legion. Typically, the latest GeForce and Radeon HD cards are compatible while Intel IGP (for example) are not, this is one of the new future of the 5000 IGP family and Haswell processors. HDMI inputs, for their part, are limited to 1080p and are mainly used to display an image in PiP (Picture in Picture), even if an image should be clean 1080p on this screen, as its native resolution is a multiple of 1920 x 1080.
Asus has not yet announced the price of the screen, but no doubt it will be very high.
HDMI and 4K
While in theory the HDMI 1.4 displays the 4K/Ultra HD, this is not the case in practice on a computer. The first reason is that the graphics cards use the same TDMS for DVI and HDMI, while the support very high resolutions require a faster TDMS HDMI 1.4. The second reason is that support high definition HDMI 1.4 is limited to 24p, 24 frames per second only. To watch a movie, this is not a concern, but for work or play, it is quickly annoying. In practice, the DisplayPort 1.2 is the only usable standard, although some screens to combine two DisplayPort 1.1 inputs.
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