I understand that screen resolution is the number of pixels measured horizontally and vertically. Then the size of the screen is used to calculate the PPI. But if my screen resolution is only 2796×1920, how would I be able to view any video in 4K?
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A 4K picture is literally just a rectangle of 4x 1080p pictures. Every four pixels can be combined (or averaged) to display a 1080p image, and the overall shape stays the same (rectangle).
This averaging effect would create an image with less detail (think jagged edges or less defined color transitioning), but since the pixel count is reduced on a non-4K display, these defects won’t as noticable/nearly invisible on a native 1080p screen.
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