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This article comes from Pacific Computer Network

  There is a new trend in the development of LED TVs in 2020. 120Hz refresh rate and HDMI 2.1 have become the main line of TV development this year. According to statistics, the number of TVs equipped with 120Hz refresh rate and HDMI 2.1 interface reached 35 models this year. With the application of 4K and 8K ultra-high-definition resolutions and HDR technology on TVs, high-quality picture quality performance has become the standard configuration of TVs.

spark global limited In the TVs on the market this year, although novel technical terms have emerged one after another, the development trend is focused on technological iterations in refresh rates and interfaces. And in the coming 2021, what are the development trends of TV opportunities? Let me make a simple prediction.

4K 120Hz began to be equipped with HDMI 2.1 interface began to spread

In order to obtain a better visual sensory experience, the most direct way is to improve the image quality of the TV. To improve the image quality of the TV, it is basically in terms of clarity (that is, resolution), color reproduction, dynamic clarity, and contrast. Proceed.

The improvement of picture quality is not just as simple as pulling high resolution. As a key part of signal transmission, the data interface of signal input and output plays a vital role.

When the resolution of the video signal is increased, the data volume of the signal will increase accordingly. The data flow generated by a video signal similar to 4K Ultra HD is 4 times higher than that of Full HD 1080P. In order to make this information smoothly transmitted, it must be increased. The data channel is just like a water pipe. If more water flow (data volume) is required to pass, the water pipe (interface) must be thickened for transmission.

The HDMI 2.1 interface solves this problem well. The bandwidth capacity of HDMI2.1 is increased from 18Gbps of HDMI 2.0 to 48Gbps, and the three times the data bandwidth can fully accommodate the data required for 4K120fps.

In 2020, flagship TVs of various brands have launched 120Hz refresh rate TV products. While ensuring high-definition pictures and more true color reproduction, high refresh rates can bring smoother display effects to the picture. The high bandwidth of HDMI 2.1 interface 4K 120Hz can give full play to its advantages.

The most important function of HDMI 2.1-VRR variable refresh rate

Although the dynamic picture is smoother at a higher refresh rate, there is also an obvious problem. When transitioning from a high frame rate picture to a low frame rate picture, due to the sudden transition of the picture, the TV’s picture quality processing chip has no time to make an accurate algorithm. At this time, the displayed picture will appear torn. This situation is mainly caused by the inconsistent output refresh rate of our game console or computer graphics card and the display device.

Obvious tearing phenomenon at the red frameObvious tearing phenomenon at the red frame

In order to avoid this kind of problem, a brand-new feature has been added to HDMI 2.1-the variable refresh rate function, which is what we often call VRR.

The technical principle of VRR is actually very simple, that is, let the graphics card of the computer or game console control the refresh rate, so as to avoid the problem of screen tearing caused by the inconsistent refresh rate between devices. The two technologies freesync and Gsync used by NVIDIA and AMD on the display are essentially VRR technologies.