The measurements of 1080p in width and height are 1920x1080. How can I translate that backwards? The iPhone XS has 2688x1242. The iPhone XR has 1792x828. Do you determine resolution by height like the measurements for 1080p? So the XR would be better resolution than 720p?
Read more: How can you tell what the resolution of a screen is when is measured by width and height?