You might have heard the word 4K tossed around a lot in the past year especially during tech expos and conventions. So 4K is a resolution basically and is measured in pixels starting at 1920×1090 resolution also referred to as 1080p or FullHD display. Now 4K displays are somewhere around 4000 pixels across and 2000 pixels down and we say approximately 4000×2000 because the exact standard varies and there isn’t an exact standard yet.
The wisely used 4K resolution is called UHD or Ultra High Definition and it measures 3840×2160. Another term which one needs to get acquainted with is when it comes to 4K TVs is ‘pixel-density’ which is nothing but the concentration of pixels in a particular area. It is measured in terms of Pixels Per Inch(PPI). A general rule of thumb is, more the pixel density of the display, more sharper and clearer is the image on the screen. How clearer the image looks to the viewer also depends on how far one is sitting from the device.
For example, for a smartphone the average distance is around a foot or less or their average pixel-density should be around 300. Whereas for devices like TVs for whom a viewer usually sits several feet away we are looking at pixel-density of 40PPI on an average. 40PPI may seem low compared to the 300PPI of smartphones these days but sitting 10-15 feet away from the TVs one is never going to be able to see the pixels. To put it in numbers, a 55-inch 4K TV comes in at ~125PPI.
As great a technology 4K is, there are also a few problems with it in the current time. First problem being that 4K ultra hd TVs are very expensive but in recent times prices of 4K TVs and gone down significantly. The other problem being, there is not much native 4K content available on our TVs but many networks are slowly but surely moving towards broadcasting 4K content one of the most prominent one being Netflix and YouTube.
A 4K TV requires an HDMI 2.0 cable to work since the HDMI 1.4 standard does not support the 4K resolution but still HDMI 2.0 is limited to a frame rate of 30FPS (Frames Per Second). The new DisplayPort Standard offers an output of 4K content as high as up to 60FPS.
Thus in conclusion we can say that if one is looking for a very sharp and pixel dense TV to buy in the market then one must surely take a look at the many 4K TVs available in the market at affordable prices today.