4K and pixel density

The 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. Our topic is the transition to high pixel density screens, including trends in the latest technology. There are two standards for 4K resolution, “DCI 4K” and “UHD 4K”.

DPI (dots per inch) is the number of dots located within a 1-inch scan or print line. For monitors and displays, DPI is discarded in favor of PPI (pixels per inch). Although PPI is an accurate term for monitors and other displays, the two terms are often used interchangeably.

PPI or DPI is a description of the screen pixel density. Higher pixel density means that more pixels will be packed into every square inch of your screen.The exact point at which a higher PPI becomes undetected is controversial. Some say the optimal pixel density is around 400 ppi, while others say the perceived pixel density is closer to 1000 ppi. Since these are personal preferences, it is always better to test the monitor yourself before opting for a screen.

DCI 4K has a double projector resolution of 2048 x 1080 pixels (4096 x 2160 / approximately 17: 9) and 4K is the resolution of the film industry. In contrast, UHD 4K (also called UHDTV 4K) is the 4K resolution of the television industry defined by the International Telecommunication Union (ITU). It has a double horizontal resolution of 1920 x 1080 pixels Full HD (3840 x 2160/16: 9). 4K is a high resolution with double the vertical and horizontal pixel numbers of Full HD and refers to resolutions with a horizontal pixel number of about 4 million.The bandwidth of the new HDMI 2.0 standard has been expanded to 18 Gbps.

The 4K resolution is so named because of its horizontal number of pixels, although the 4K resolution corresponds to a pixel number of 3840 x 2160 on monitors. The 4K resolution is also four times more pixels than 1080p. Although the market share of 4K resolution has increased since 2014, its adoption has so far been limited to internet streamings, video projections, and commercial televisions.

Today, as screen resolution continues to rise, pixel density is a new element to consider when choosing a screen. The pixel density on the screens is a specification that indicates the level of resolution, and the value is usually given in ppi. Ppi stands for "pixels per inch" (not per square inch). One inch is 2.54 centimeters. If you reduce the pixel height without changing the screen size of the LCD screen, the ppi will increase and the higher this value, the higher the screen resolution. For example, at 100 ppi it has 100 pixels of 2.54 centimeters each, and at 300 ppi 300 pixels are packed to the same width.

DPR or device pixel ratio, also known as CSS pixel ratio, is the number of physical pixels that make up a CSS pixel in each direction of the screen, e.g. B. in the direction of width or direction of height. It’s hard to describe, but when you compare screens on smartphones that have high-pixel density screens, with traditional computer screens with low pixel density, you immediately see the benefit.

Compared to the sharp and smooth screen on a smartphone, the screen on a computer looks dirty and a grid of pixels is visible. When it comes to visual devices, looking at the actual display often has a greater impact than a lengthy description. After the retina display came on the market and received positive feedback, several manufacturers introduced smartphones, tablets and computers with high pixel density screens, so that they were extended to ordinary users as well.

When choosing an LCD in the future, the pixel density resulting from the combination of screen size and resolution should also be taken into account. As already mentioned, screens with super high pixel density generally require magnification with scaling before use, so high resolution (large number of pixels) does not mean a large working area. This is an important point to consider carefully.