4K displays, or UHD (Ultra High Definition) displays have a 3840 x 2160p resolution. They’re the first one to adapt the horizontal pixel count instead of the standard vertical pixel count (like 1080p is 1920 x 1080p). As screens get bigger and bigger, the need for higher resolutions become more apparent as pixel density, or the number of pixels per inch (PPI) decreases as the screen size increases. This results in blocky, and pixelated content being displayed by the monitor.
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https://www.yugatech.com/guides/an-introductory-guide-to-4k-displays/#sthash.2qniyWAl.dpbs#XTOvlAbRRrHHXPRX.97
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