What is 4K ?
Of course, you've heard 4k a lot in the past, like 4k video, 4k image quality, 4k camera and many channels on YouTube now, providing high-quality content up to 4k and more in a few cases. What does 4k mean?
4K accurately defined:
4K is accuracy and any accuracy measured by pixel, for example the accuracy of most smart phones now is 720 × 1280. Laptops have a larger screen and therefore the number of pixels used is slightly higher. Most laptops now have a resolution of about 1080 × 1920. The 4K screens are usually 2000 × 4000 pixels. We usually say because there is no fixed measurement but the closest measured measurement is now called UHD: Ultra High Definition, and measures exactly at 2160 × 3840 and this is a very large number of pixels.
Another very different thing is the pixel density, which is the number of pixels in a screen by its area. The denser the screen, the more visible. A 5-inch 1080p display: for example, the Sony Zperia Z is more vivid than a 17-inch screen on most laptops. On the number that the accuracy is the same but the pixel density is lower in the laptop. The variable that moves the equation is the distance between you and the screen itself. For example, we look at the screens of mobile phones from only a few centimeters, so we need a screen pixel density of about 300 pixels per inch so that we see the picture is complete and clear.
As for laptops, we look at them from a distance of tens of centimeters. We do not need much density of about 100 pixels per inch, which is often enough. As well as in the case of the television screen, we look at them from a distance, we need only about 40 pixels per inch. These figures are also for a 1080p screen, but on 15-inch displays in the laptop example and 55 inches in the case of the TV screen.
If the 4K resolution offers a high pixel density, it is at least 100 pixels per inch. Resulting in a high-resolution fairy image even from a distance of centimeters. First, the cost of screens that provide this accuracy, the latter that affects the final price of the product, but will solve this problem over time and companies will compete to provide high-resolution screens and maintain reasonable prices. The second problem with this technique is the lack of content. To benefit from a screen with such precision, the content presented must be exactly the same. The TV shows now have 1080p resolution in most cases, but the most recent computer-oriented screen of the games often provides a 4K headphone and a very large frequency.
More similar abbreviations such as 2K are equal to 1440 x 2560 pixels and are found in many laptops, tablets and some Smartphone’s.