“UHD” is the abbreviation of Ultra High Definition, which means Ultra High Definition. The “UHD” standard proposal issued by the International Telecommunication Union (ITU) calls the display with a physical resolution of 3840×2160 (4K×2K) and above as ultra high definition. Under different standards, the resolution represented by UHD is different. For example, the common resolution of Full Aperture UHD in the film industry is 4096 x 3112 and Academy UHD is 3656×2664. Generally speaking, UHD TV is the standard issued by ITU.

FHD is called Full High Definition. In the internationally recognized standards, “HD” is defined as three standard forms of 720p, 1080i and 1080p. But FHD is 1920*1080p. There are two conditions for this standard: 1. the video vertical resolution exceeds 720p or 1080i; 2. the video aspect ratio is 16:9. “P” means progressive scanning and “I” means interlaced scanning. Generally speaking, 480*320, 640*480 are “standard definition”; 1024*720p, 1920*1080i are “high definition”; 1920*1080p is “full HD”; 3840*2160, 7680*4320 are “ultra HD” (UHD).

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