HD TV standards evolved from analog to digital, with ITU and SMPTE developing standards like 720p and 1080i. By the early 2000s, these culminated in the 16:9 aspect ratio and 1920×1080 resolution for HD displays. The shift to HD standards set a precedent for future resolutions like 4K and 8K, marking a milestone in standardization efforts across TV and computer displays after decades of varied formats and resolutions.
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