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Is The 4K Era Really Here?
Nov 13, 2018

What is "4k"? Due to the promotion of the merchants and the labeling on the products, many friends have misunderstood the understanding of 4K. 4K is not only better than 1080P full HD, but also improved in definition. More importantly, it is a set of "UHD" ultra HD. standard. Ultra-high definition image quality is mainly reflected in five aspects: resolution, color depth, color gamut, contrast and frame number. The resolution we all know is 4K.


Color depth: 10bit. The Ultra High Definition Blu-ray standard specifies a color depth of 10 bits, which means that it can display 1.07 billion colors (each of the RGB has 2 to 10 powers, that is, 1024 levels, and RGB three colors have 1.07 billion (1024 × 1024 × 1024). Color matching). The ordinary Blu-ray standard supports 8bit color depth, only 16.77 million colors, and the gap is wide.


Color gamut: BT.2020 color gamut standard. The BT.2020 color space has been positioned by the ITU International Telecommunication Union to target an image signal gamut standard in the 4K/8K era and is one of the standards for ultra high definition Blu-ray. The normal Blu-ray standard uses the BT.709 color space, which covers only 35.9% of the BT.2020 color space, which is the largest color space in current display devices, covering 75.8% of the CIE 1931 color space.


Contrast: HDR high dynamic range image. HDR is not the first concept proposed by Ultra HD Blu-ray, but it is critical to the improvement of image quality and is the most compelling place in the Ultra HD Blu-ray standard. HDR, high dynamic contrast, on the screen is able to take care of the dark and highlight details at the same time, bringing a dynamic range closer to the human eye. Due to the brightness limit of ordinary TVs, projectors and other display devices, the contrast performance is always limited, that is, the SDR (Standard Dynamic Range) level. Generally, the contrast of the LCD screen of our mobile phone is only 1000:1. With the introduction of HDR, a wider 100000:1 contrast ratio can be achieved.


Frame number: 60p. The number of frames represents the number of pictures contained in the 1 second video. The higher the number of frames, the more vivid the picture is observed by the human eye, and there is no intermittent feeling. The standard Blu-ray standard frame number is 24p, which is a continuation of the early film film specifications, while the ultra-high-definition Blu-ray standard can support up to 60p, as long as the support of high frame number, playing ultra-high-definition Blu-ray movies can achieve smoother picture performance.


4K, 10bit, BT.2020, HDR, 60p, ultra-high-definition Blu-ray can be described as a five-in-one all-round image quality enhancement. Then add a new H.265/HEVC code, the picture performance is normal compared to the ordinary Blu-ray standard, of course, you must also have a good enough 4K display device and ultra high-definition Blu-ray player. Since the ultra-high-definition Blu-ray disc has a maximum code rate of 100 Mbps, which is more than twice that of ordinary Blu-ray, a high-performance Blu-ray player is indispensable.


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