In the second half of last year, the International Telecommunications Union Radiocommunication Sector (ITU-R) promulgated the BT.2020 standard for a new generation of ultra-high definition UHD (Ultra-high definition) video production and display systems, redefining the field of television broadcasting and consumer electronics. The parameters of the ultra-high-definition video display promote the further standardization of 4K ultra-high-definition home display devices. The most important of these is that the BT.2020 standard states that the UHD ultra-high definition video display system includes two stages of 4K and 8K, of which the physical resolution of 4K is 3840×2160, and that of 8K is 7680×4320. The reason why the ultra-high-definition video display system has two stages is actually caused by the development differences of ultra-high-definition video display systems in various regions of the world. For example, in Japan, where technology is leading in the field of television broadcasting, it directly develops 8K TV broadcasting technology to avoid A technical obstacle that may arise from the transition from 4K to 8K. In other parts of the world, most of them use 4K technology as the next generation of TV broadcasting development standards.
BT.2020 standard divides UHD ultra-high definition video display system into 4K and 8K stages The importance of the BT.2020 standard is unquestionable. Just as BT.709 plays a guiding role in the manufacture of high-definition video transmission and high-definition display devices, the BT.2020 standard also profoundly affects the design of ultra-high-definition display devices in the consumer field. And manufacturing, especially in the 4K flat-panel TV. For example, the physical resolution of most 4K flat-panel TVs is currently 3840×2160 using the BT.2020 standard, instead of 4096×2160 of the DCI digital cinema standard. But it must be mentioned that 4K projectors, especially the original 4K models, mostly use the DCI standard. Later we will conduct a detailed analysis of the 4K specification in the DCI standard.
In the definition of 4K display resolution, the BT.2020 standard specifies 4K to be 3840×2160, which is exactly four times that of 1920×1080. Almost all 4K flat-panel TVs use the BT.2020 standard with respect to the BT.709 standard, which greatly improves the performance specifications of video signals. For example, in terms of color depth, it is raised from 8bit of BT.709 standard to 10bit or 12bit, of which 10bit is for 4K system and 12bit is for 8K system. This improvement played a key role in enhancing the color and transition of the entire image. The area of ​​the gamut is far larger than the BT.709 standard, which can display more colorful colors. However, the wider the color gamut, the higher the performance requirements of the display device, according to the current 4K ultra high definition projector. The situation often needs to be achieved with a new generation of laser or LED solid-state light source models.
The BT.2020 standard brings a new color gamut standard, the area is much larger than the BT.709 standard, close to the DCI standard. Tips: UHD standard screen resolution and refresh rate BT.2020 standard specifies that the Ultra-high definition ultra-high definition image display resolution is 3840×2160 and 7680×4320, the screen display ratio is 16:9, the supported refresh rate includes 120p, 60p, 59.94p, 50p, 30p, 29.97p, 25p, 24p, 23.976p. It must be mentioned that interlaced scanning has finally been eliminated in the BT.2020 standard. All images under the Ultra HD standard are based on progressive scanning, which is undoubtedly a historical breakthrough, further enhancing the fineness of ultra high definition images. A sense of fluidity.
Tips: 4K video signal analysis under UHD standard For 10bit 4K ultra high definition signal, BT.2020 standard defines the entire video signal range of 4-1019, 64 is standard black level, 940 is standard peak, so effective video The signal is 64-940. While 0-3,1020-1023 puts the clock reference signal, 4-63 is the signal below the standard black level, and 941-1019 is the signal above the standard peak. Such parameters are not very meaningful for ordinary audio and video enthusiasts, but if you need to correct 4K display devices in the future, you need to make in-depth adjustments through the above data. As for how to adjust, you may wish to pay attention to our future special planning for 4K video tuning. 
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