In the second half of 2012, the International Telecommunication Union Radiocommunication Department (ITU-R) promulgated the BT.2020 standard for the new generation of ultra-high definition (Ultra-high definition) video production and display systems. The BT.2020 standard pointed out that UHD ultra-high definition video The display system includes two stages, 4K and 8K. The physical resolution of 4K is 3840×2160, and the physical resolution of 8K is 7680×4320.BT.

The 2020 standard is relative to the BT.709 standard:

1. In terms of color depth, the BT.709 standard is upgraded from 8bit to 10bit or 12bit, where 10bit is for 4K systems, and 12bit is for 8K systems.

2. The BT.2020 standard stipulates that the display resolution of Ultra-high definition ultra-high definition images is 3840×2160 and 7680×4320, the screen display ratio is 16:9, and the supported refresh rates include 120p, 60p, 59.94p, 50p, 30p , 29.97p, 25p, 24p, 23.976p. The BT.2020 standard finally cancels interlaced scanning, and all images under the ultra-high-definition standard are based on progressive scanning.

3. For 10bit 4K ultra-high-definition signals, the BT.2020 standard defines the range of the entire video signal in the range of 4--1019, where 64 is the standard black level and 940 is the standard peak value, so the effective video signal is 64-940.

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