Transition to high-density pixel displays that began with smartphones and tablets has spread to the computer monitors. 4K PC screens appeared in 2014, and understanding pixel density has become important when choosing a product, along with screen size and resolution. There are two standards for 4K resolution, “DCI 4K” and “UHD 4K”. Question of what is my screen resolution can be answered as: the display resolution of a digital television, computer monitor, tablet, smartphone or display device is the number of distinct pixels in each dimension that can be displayed. 4K is not a standard description of a number of pixels. It is an approximation of the number of pixels in width (as opposed to the earlier convention of how many pixels are high, as in 480p, 720p, 1080p, etc.). Something with a width of about 4000 pixels is called 4K. So there is a range from 3840 pixels to at least 5120 pixels for "ultra-wide 4K" displays, broadcasts, or videos.
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