HDMI 2.0 Everything You Need To Know

HDMI standard is the abbreviation of high definition multimedia interface. This standard is made by Sony, Hitachi, Panasonic and Toshiba.
It was launched in April 2002 by companies such as Xia and Toshiba. The biggest feature of HDMI is that it can transmit audio and image at the same time, which solves the previous problems of wire video and audio
The problem of separate transmission was successful.
For households, HDMI 1.4 is the most popular (former). It is more than enough for the standard to hold 1080p and 1440p. However, after the 4K era, HDMI
1.4 only 3840 can be output × 2160@30Hz The image is crowned with "false 4K". The revised HDMI 1.4A and HDMI 1.4b of HDMI 1.4 are mainly needles
For 3D images, two 3D formats of "broadcast" and 3D images of 1080 / 120P are added.
In order to improve the support of 4K video, HDMI 2.0 was launched in September 2013. The main change is that the bandwidth of HDMI 2.0 is increased from 10.2gbps to
18gbps, with enough bandwidth, 3840 can be transmitted × 2160@60Hz The image can finally hold 4K perfectly. Both HDMI 2.0A and HDMI 2.0B are
The revision and modification based on HDMI 2.0 adds HDR support, that is, dynamic lighting rendering.
The latest version of HDMI was officially launched in 2017. HDMI 2.1 bandwidth suddenly increased to 48Gbps, which can be maintained at most
seven thousand six hundred and eighty × 4320@60Hz Image of. At the same time, each pixel has 12bit color depth, and it also support dynamic HDR technology

Difference between HDMI2.0 and HDMI1.4

The official HDMI organization is HDMI Forum Inc., which ultimately produces all HDMI specifications and standards. To produce HDMI specifications, also depends on the innovation of various manufacturers and technologies, and finally comes from a comprehensive. HDMI2.0 was first proposed in September 2013.

1. In terms of hardware, HDMI2.0 and HDMI1.4 adopt the same interface and connector, so as to ensure perfect downward compatibility of 2.0 and direct use between the two types of data lines;

2. 2.0 has greatly enhanced the support for 4K ultra HD transmission in terms of performance, and has made improvements in multiple video and audio technologies. Earlier HDMI1.4 only supported 4K@60Hz in YUV420 color format at the highest bandwidth of 10.2Gbps. Although the resolution is high, the image quality will be lost because the image color compression is too high;

3. HDMI 1.4 already supports 4K resolution video transmission, but is limited by bandwidth limitations, up to 3840*2160 resolution and 30FPS frame rate. Hdmi 2.0 expands the bandwidth to 18Gbps and supports 3840 x 2160 resolution and 50FPS and 60FPS frame rates. In addition to the upgrade in resolution and frame rate, audio can also support up to 32 channels and up to 1536KHz sampling rate;

4. There are also improvements in the following aspects: simultaneous transmission of dual video streams to multiple users on the same screen; Synchronous transmission of multiple audio streams to up to four users; Support 21:9 ultra widescreen display; Dynamic synchronization of video and audio streams; Cec extensions provide better control of consumer electronic devices from a single control point;

Difference between HDMI2.0 and HDMI2.1

HDMI2.1 is the latest HDMI standard. At present, all RTX3 graphics cards support HDMI2.1. In contrast, RTX20 series graphics cards do not support HDMI2.1 at all, only HDMI2.0 and DP1.4

HDMI2.0 has a peak bandwidth of only 18Gbps, while HDMI2.1 has a peak bandwidth of 48 Gbps, a nearly three-fold difference. HDMI is also the fastest theoretically available interface, faster than DP1.4, with higher bandwidth to support higher resolution and refresh rates.

For example, let's take a display that supports 4K 120Hz. The bandwidth required for such a monitor is 3840x2160(resolution)x8(BPC)x3(pixel multiple)x120(refresh rate)/0.8(hdMI 8B / 10B encoding)/1024 ^ 3 =27.8Gbps. This is in the case of 8bit color depth, 10bit color depth, it will reach nearly 30Gbps bandwidth, this number is far more than HDMI2.0 limit.

To put it simply, if you're using an HDMI2.0 port for video input, your screen will only run up to 4K 60Hz. As for the display, the remaining 60Hz is completely wasted. But if you are using an HDMI2.1 interface, there is no such problem. HDMI can theoretically support 8K 60Hz picture output requirements, which is higher than DP1.4.

HDMI2.1 in the display field penetration rate is quite quite low. A display with 120Hz 4K resolution needs a bandwidth of about 30Gbps at most, which is the top screen that ordinary users can access in daily life. As for 8K display, there are very few in current life, and only the rich can afford it.
Such a screen, however, is entirely affordable for video transmission using DP1.4's standard interface, and does not require HDMI2.1 at all. Also, HDMI2.1 has a low penetration rate. As shown below, this is a Samsung 4K 120Hz monitor priced at 4K level, not low-end. It only has one HDMI2.0 port and one DP1.4 port, but no HDMI2.1 port at all.

Display manufacturers pay the HDMI Association extra to use the HDMI2.1 interface, whereas DP does not. So on the premise that DP1.4 can meet the basic needs, there is no need to add a less effective HDMI2.1. So, HDMI2.1 in the display field is not what the sense of presence.

However, HDMI2.1, which has been a bit of a loser in the display world, is making a splash in the TV world. Because both SONY's PS and Microsoft's XBOX only support HDMI, not DP. This means that if you want the 4K 120Hz experience of the next generation platform, you have to buy a TV or monitor that supports 4K 120Hz +HDMI2.1

HDMI2.0 bandwidth is 18Gbps, HDMI2.1 bandwidth is 48Gbps.
Dynamic HDR function differences: HDMI2.0 does not support dynamic HDR. HDMI2.1 supports tweaking HDR metadata content on a frame-by-frame basis for better picture quality.
Image difference: HDMI2.0 supports 60 frames of 4K image, 30 frames of 8K image; HDMI2.1 supports 4K images at 120 frames, 8K images at 60 frames, and 10K resolution.


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