When it comes to 4K output, of course, support for the output interface standard is indispensable. For the 4K, see an article that was introduced before: "Uncover the 4K movie core code HEVC/H.265". Currently, the interface that can output 4K resolution is only HDMI and DisplayPort. HDMI2.0 (downward compatible) and DP1.2 can support up to 4K 60Hz, there is no important difference between the two, but the DisplayPort interface is not as popular as HDMI due to the late launch time. So, let's talk about the better compatible HDMI interface today.
If you want to smoothly output 4K video, the refresh rate must be at least 24Hz, so you need to use the HDMI 1.4 or higher standard interface. The data bandwidth of HDMI 1.4 is 10.2Gbps, and the output 4K resolution specification is only 4096*2160@24 Hz or 3840*2160@30Hz.
Although HDMI 1.4 has already met the requirements for outputting 4K video, if you carefully compare the BT.2020 standard (a new generation of ultra-high definition UHD video production and display system standards) issued by the International Telecommunication Union for display systems, you can find that the new 4K movies are also It has been produced with a higher frame rate, and the supported frame rate has been increased to 50p, 59.94p, 60p, or even 120p. For example, the famous director Peter Jackson's "The Lord of the Rings" prequel - "Hobbit" has adopted 48 frames technology, HDMI 1.4 standard does not support 4K signals at these frame rates. On the other hand, HDMI 1.4 can only support 8-bit color, and can not really play the 10-bit color depth display advantage of 4K video.
In home theater systems, the amount of data in a high-quality audio stream is much larger than that of a video signal, so the support for audio signals is also of great concern to many people. HDMI 2.0 has more powerful audio features, supports multiple audio streams and audio sampling rate up to 1536kHz, and also supports dynamic automatic sound and picture synchronization to effectively avoid the problem of audio and video out of sync.
HDMI 2.0 requires hardware support. Other popular processors that support 4K video output, such as Qualcomm's Snapdragon 810 or NVIDIA Tegra K1, can only output 24Hz or 30Hz when outputting 4K video, which is obsolete at birth. Obviously, the HDMI1.4 specification has been outdated in the face of 4K, and the box only supports HDMI2.0 (4K 60Hz), which is considered to be "practical value".
At present, Sony and Samsung are the most active advocates of HDMI 2.0 interface. Sony upgraded the interface standard of all 4K TVs when the HDMI 2.0 standard was first introduced. Samsung 2014 UHD TV supports the latest 2.0 version and has to admire the big manufacturers. The control of the industry development trend. Therefore, 4K devices that are not equipped with an HDMI 2.0 interface should be purchased with caution.
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