HDMI, or High Definition Multimedia Interface, is a fully digital video and sound transmission interface that can send uncompressed audio and video signals. It is widely used in set-top boxes, DVD players, personal computers, televisions, game consoles, integrated amplifiers, digital audio and televisions, and other devices.An HDMI cable can transmit audio and video signals at the same time, the highest data transmission speed of 5Gbps, can support 1080P, 720P full HD format video output, is currently the most popular high-definition interface.

1.Maximum bandwidth capacityThe maximum bandwidth capacity of HDMI 2.0 is 18Gbps, while the maximum rate of HDMI 2.1 can do 48Gbps.Therefore, it can be said that HDMI 2.1 can transmit more information, the transmission of the picture has a higheresolution and higher frame rate.2. Resolution and Frame RateThe new HDMI 2.1 standard now supports 7680×4320@60Hz and 4K@120hz. 4K includes 4096×2160 pixelsand 3840×2160 pixels for true 4K, whereas in the HDMI 2.0 specification, only up to 4K@60Hz is supported.3. Playback smoothnessAlthough the same playback of 4K60Hz video, the smoothness performance difference between the two will not be very obvious. But HDMI 2.1 can be very process to support the playback of higher frame rate video,as it supports the playback of 4K120Hz video, while HDMI 2.0 can not be played.4. Latency HDMI 2.1 features variable refresh rate and fast frame transfer, both of which can reduce latency or even make the possibility of input latency to 0. When the refresh rate of the picture output from the graphics card does not match the refresh rate of the monitor, it may cause picture tearing, which is especially affective when playing games. Therefore, the HDMI 2.1 upgrade brings ALLM (Automatic Low Latency Mode). In Auto Low Latency Mode, Smart TV users don't have to manually switch the low latency mode according to the content being played on the TV, the TV will automatically enable the low latency mode intelligently according to the content being played.