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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Imagine a square painting. Cut it into 4000 pieces from top to bottom, and then again from left to right. Remove every other square from left to right, and then again top to bottom. Push the remaining pieces together. You just went from 4000×4000 pieces (pixels) to 1/4th the size, 2000×2000 pixels. Your phone does this for each frame.
Note, 4k means 2,160 x 3840 pixels. Images get every _n_ pixels dropped, based on the target screen ratio.
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