4K pixel density
Over the next few years, 4K is expected to replace Full HD as the main resolution. 4K, of course, means 4000 and refers to a number of horizontal pixels of about that number. There are currently two standards for 4K resolution, namely “DCI 4K” and “UHD 4K”.
4K is high-resolution with twice the vertical and horizontal pixels compared to Full HD and refers to resolutions with approximately 4 million horizontal pixels.
In the MST system, the operating system recognizes 4K as a dual screen with a resolution of 1920 x 2160 pixels, so a GPU driver is required to combine the output into a single screen. Depending on the version of the GPU and driver used, there were problems such as syncing the display on the left and right of the screen or a malfunction in a multi-screen environment.
In contrast, the SST (Single Stream Transport) system can transmit 4K resolution on a single screen, so it is capable of displaying 4K 60Hz without internal image synthesis or other processes. There are no problems arising from splitting the signal into two screens, like the MST, but some devices with DisplayPort 1.2 have graphics cards that do not support SST, so the card should be checked at the time of purchase. To see if it supports SST.
However, the current DisplayPort 1.2 does not support 5K output, so it should be noted that currently 5K displays require a special configuration to send video signals through two cables. Although not yet released, the new DisplayPort 1.3 standard announced in September 2014 supports 5K (5120 x 2880 pixels) 60Hz display and UHD 4K simultaneous display on two screens via a chain link. Once computers (GPUs) that support DisplayPort 1.3 are available, 5K 60Hz signal output will be possible with a single cable.
As screen resolution increases, the new element to consider when choosing a screen today is pixel density. The pixel density on the screens is a specification that indicates the degree of definition, and the value is usually expressed in ppi. Ppi stands for "pixels per inch" (not per square inch). One inch equals 2.54 centimeters.
Reducing the distance between pixels (pixel spacing) without changing the screen size of the LCD screen increases the ppi, and the higher the number, the higher the screen definition. For example, at 100 ppi it has 100 pixels of 2.54 centimeters each, and at 300 ppi it has 300 pixels wrapped in the same width.
The higher the pixel density on the screen, the higher the definition of the operating system and applications, but there was no screen with such a high pixel density that it could not be used in practice, so it did not lead to major problems. Depending on the pixel density, the icons and fonts looked larger or smaller, but the definition was sufficient for users to recognize them.
Of course, the larger the screen size, the more space you’ll have to adjust the workspace and magnification speed, so if you’re not sure, choose a screen with a very high pixel density, slightly larger than your current screen. , and you should be able to create a comfortable environment without any problems (you will still need to pay attention to the physical space required for the screen).
When choosing an LCD screen in the future, it will also be necessary to take into account the pixel density resulting from the combination of screen size and resolution.