PPI

PPI or DPI is a description of the density of pixels on the screen. A higher pixel density means more pixels will be packed into every square inch of your screen.

The exact point at which a higher PPI goes undetected is controversial. Some say the optimal pixel density is around 400 ppi, while others say the perceivable pixel density is closer to 1000 ppi. Since these are personal preferences, it is always better to test the monitor yourself before deciding which screen to use.

DCI 4K has twice the projector resolution of 2048 x 1080 pixels (4096 x 2160 / approx. 17: 9) and 4K is the resolution of the film industry. In contrast, UHD 4K (also called UHDTV 4K) is the television industry's 4K resolution defined by the International Telecommunication Union (ITU). It has double the horizontal resolution of 1920 x 1080 pixels Full HD (3840 x 2160/16: 9). 4K is a high resolution with double vertical and horizontal pixels from Full HD and refers to resolutions with a horizontal pixel count of about 4 million.

If you reduce the pixel height without resizing the LCD screen, the ppi increases, and the higher this value, the higher the screen resolution. For example, at 100 ppi it has 100 pixels each 2.54 centimeters, and at 300 ppi 300 pixels are packed to the same width. DPR or device pixel ratio, see here: Screen resolution, 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 width direction or height direction.

When choosing an LCD, you should also consider pixel density, which results from a combination of screen size and resolution. As mentioned earlier, screens with a high pixel density basically require scaling with usage before usage, so high resolution (a large number of pixels) does not apply to a large work area.