Read HDMI 2.1

With the continuous development of digital technology, TV products have successfully completed the transition from analog to digital, in which HDMI multimedia digital interface plays a crucial role. From the original HDMI version 1.0 to the current version 2.1, HDMI is also improving with the continuous upgrading of TV specifications. However, in the market, some high-end TV products still use HDMI 2.0 or even older version 1.4 in order to save costs, which has caused some controversy.

Some people think that for today's TV and other display products, if they are not equipped with HDMI 2.1 standard, they seem to lack some necessary functions, just like buying a defective product. So, what exactly is HDMI 2.1? Do we really need it? Today, we will answer these questions in detail.

HDMI， The full English name is "High Definition Multimedia Interface", which means "High Definition Multimedia Interface". This interface can transmit data without compress Of high-definition video and multi-channel audio data without the need for digital/analog or analog/digital conversion before signal transmission. This uncompressed digital data transmission mode greatly reduces signal interference and attenuation. We can player HDMI interface has been widely used on displays, set-top boxes and other devices.

Although HDMI 1.4 standard has supported 4K definition since 2009, it only supports lower specifications up to 30Hz. The HDMI 2.0 standard, also known as "HDMI UHD", increases the bandwidth from 10.2Gbps to 18Gbps, supports 4K/60Hz video images, and is compatible with the Rec.2020 color gamut range, bringing more rich color performance. However, HDMI 2.1 has been upgraded more significantly than version 2.0.

The most significant improvement of HDMI 2.1 is the increase of video bandwidth, which has jumped from 18Gbps to an astonishing 48Gbps. This increase in bandwidth makes it possible for higher resolution images. For 4K resolution, HDMI 2.1 standard can support 4K/120Hz images. This high refresh rate can not only bring a smoother 4K movie experience, but also meet the needs of current popular 3D/VR and other devices, and even surpass the rival Display Port 1.4 in specifications.

Under the HDMI 2.1 standard, 8K/60Hz images can be displayed through a single cable. Even for 10K resolution images, HDMI 2.1 standard can provide support. In addition, HDMI 2.1 supports the latest Dynamic HDR technology. Compared with the static HDR of HDMI 2.0, dynamic HDR can readjust every scene or even every frame of the video. These continuous instructions are called dynamic metadata. HDMI 2.1 provides a comprehensive mechanism for transferring dynamic metadata, so that each frame can display the ideal depth of field, details, brightness and contrast, as well as a wider color gamut.

For gamers, the HDMI 2.1 standard also improves the handling of game images. It has the function of supporting VRR and QFT, which can reduce or even eliminate the screen delay during the game. Fast media conversion (QMS) can reduce the black screen time when the user converts the signal input source. HDMI 2.1 also includes Automatic Low Delay Mode (ALLM), which can automatically set the ideal picture delay to obtain the most fluent viewing experience.

In terms of sound effects, the HDMI 2.1 standard has also been comprehensively upgraded. It supports the latest eARC technology. Compared with the existing ARC (Audio Return Channel), it can return high-quality sound effects, such as Dolby Atmos and other object based sound effects.

To sum up, HDMI 2.1 has significantly improved the 4K HDR image. It has not only achieved great improvement in bandwidth and resolution support, but also added multiple enhanced refresh rate technologies for videos, movies, and games. In brief, when the cable and input device meet the performance standards, HDMI 2.1 can enable TV and other display devices to "overclock" and make the picture more smooth.

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