Many people think that the device interface is not very important. To be honest, at the beginning of the design, the I / O device is equipped with appropriate interface configuration as far as possible. Take the display device as an example, the resolution and refresh rate supported by the panel will generally be equipped with matching interface specifications, 1080p definition display, so it is not necessary to carry 4K interface configuration, and the consumption is low When choosing a product, it doesn’t need to make a tangled choice.

HDMI 2.1 interface specification introduction

Small interface, University asked

But we need to pay attention to that when we improve the resolution of the video signal, the amount of data of the signal will increase. The data volume of 3820×2160 4K UltraHD signal transmitted by HDMI is about four times that of HD 1920×1080 signal. If the cable is regarded as a water pipe, a larger water pipe than 1080p is needed to transmit 4K signal.

2020 display new standard HDMI ushers in an important upgrade

As early as in ces2017 exhibition, HDMI announced the new HDMI 2.1 specification. The wire speed specification has reached 48Gbps, allowing 8K / 60 frames per second or 4K / 120 frames per second of image data to pass. In addition, it can also bring gain to the 4K TV equipped with the interface.

·The upgrade of external equipment should require thicker water pipes

What you are concerned about is that this year’s flagship TV sets are equipped with panels with a refresh rate as high as 120Hz. While maintaining color performance, high refresh rate panels can bring smoother display effects. As we mentioned earlier, HDMI 2.1 interface is a necessary condition to support 4k120hz image transmission. With HDMI 2.1 interface, the advantage of high bandwidth and throughput of the interface should be further developed.

HDMI 2.1 interface specification introduction

The high refresh rate panel is a double-edged sword. Compared with the high refresh rate electronic competitive display, the fast frame rate picture will be torn if it is too sudden. Therefore, NVIDIA and AMD have launched g-sync and free sync technologies to improve this situation.

For TV products, there is a more simple and direct way to improve this situation, which requires the use of another feature of HDMI 2.1 – VRR (variable refresh rate). The higher bandwidth of HDMI 2.1 can transmit more data, which can “coerce” the “small actions” of more chips in the data.

HDMI 2.1 interface specification introduction

By changing the speed of the front and back frames, the new next-generation host will also be equipped with HDMI 2.1 interface, so it also supports VRR function. At the same time, the new interface also brings allm (automatic low delay mode), which further improves the feedback efficiency of TV and external devices.

·Specification change of “rough water pipe” HDMI 2.1

First of all, it supports dynamic HDR, which optimizes HDR on the basis of each scene or even each individual frame, rather than applying one profile to the whole video.

HDMI 2.1 interface specification introduction

Moreover, game players should be interested in variable refresh rate (VRR), which allows the data output terminal to determine the update frequency of the output signal. If the display is matched, the update frequency can be adjusted to be consistent with the current FPS, greatly reducing the occurrence of picture tearing.

·Screen, machine and line are three in one, no one can do without them

Looking back on the 1080p Full HD era, Sony’s PS2 and Xbox still can’t squeeze the performance of mainstream TV sets at that time. After entering the 4K era, the PS3 and Xbox 360 are getting old again. The 4K image quality of the game screen is too much for PS4 and Xbox one. It can be said that the game console and TV have never caught up with the time, location and people like 2020. Host support 4K 120Hz TV is also the case, and hinder their mutual blessing, it is just this wire.

HDMI 2.1 interface specification introduction

You should pay attention to the main selling points of TV this year

HDMI 2.1 higher bandwidth can transmit more data, of course, it can also support more function signal transmission. VRR (variable refresh rate) as a function that can only be carried in the case of high bandwidth, can bring more complete and unified picture view by changing the speed of the front and back frames. At the same time, the new interface also brings allm (automatic low delay mode), which further improves the performance The feedback efficiency of TV and external equipment is improved.

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