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DP interface is no worse than HDMI and even free. Why don't TV manufacturers use it?

via:CnBeta     time:2020/12/28 8:28:06     readed:653

The release of the new Xbox and ps5 not only makes people covet the next generation of console games, but also pushes the 4k120hz high brush Game TV into the hot search. It also popularizes the knowledge of hdmi2.1 standard port for console players. Compared with the current mainstream version 2.0, hdmi2.1 can transmit more video and audio content per second, so it can load 4K ultra-high resolution and achieve a picture refresh rate of 120 frames.

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What is the interface between DP and HDMI?

DisplayPort (DP) is a digital video interface standard developed by PC and chip manufacturers alliance and standardized by VESA. The interface is free of authentication and authorization fee. It is mainly used for the connection between video source and display, and also supports carrying audio, USB and other forms of data.

High definition multimedia interface (HDMI) is a fully digital image and sound transmission medium, which can transmit uncompressed audio and video signals. HDMI can be used in set-top box, DVD player, personal computer, TV amusement device, integrated amplifier, digital audio and TV.

Generally speaking, DP and HDMI interfaces are very similar in function. They can be used for the transmission of video and audio signals. Of course, besides convenience, the strength of the two interfaces depends on their hardware parameters

Dp1.4: the maximum total bandwidth of the main link is 32.40gbps, and the maximum total data rate is 25.92gbps

Hdmi2.1: transmission bandwidth 48.0gbps, maximum data rate 42.6gbps

Other performance comparison: both support 1080p30-240hz, 1440p/ 2k@30-240Hz 、4k30-144Hz/240HzDSC、5k30-60Hz/120HzDSC、 8k@30Hz/60HzDSC The only difference is that dp1.4 also supports dci-p3 color space, while hdmi2.1 additionally supports 8k120hz

Overall, the bandwidth of dp1.4 is slightly smaller than that of hdmi2.1, but the current mainstream applications are definitely more than enough, and the newly upgraded dp2.0 standard will also reach 80GB / s bandwidth.

Why TV manufacturers stick to HDMI

From the technical level, the parameters of dp1.4 interface and hdmi2.1 interface are almost the same, and some extreme "performance" gaps are only for super video enthusiasts, while for ordinary users' daily entertainment use, there is no difference between the two. So why don't TV manufacturers switch to free DP interface?

In fact, it's not that TV manufacturers have too much money to spend. On the contrary, they insist on adopting HDMI interface because of the balance of cost and benefit. DP interface is a protocol dominated by PC and monitor manufacturers, while HDMI interface is a protocol dominated by TV manufacturers. At present, in the field of television, the popularity of HDMI has been very high. At the same time, all kinds of "derivative products" related to television, such as TV box, game console, player, speaker power amplifier and so on, are also based on HDMI interface.

In addition, for a small number of people with special needs - PC host connected to TV, most of the graphics cards will also be equipped with HDMI interface, and the DP interface can easily support HDMI connection through transfer. And HDMI transfer support DP, it is very inconvenient, and expensive! Therefore, it is the most cost-effective direction for TV manufacturers to upgrade HDMI interface to 2.1 standard according to market demand.

The future of DP interface

In general, although the hardware parameters of DP interface are excellent, and the parameters of dp2.0 can be called "violence", compared with the market share of HDMI interface at this stage, DP interface can only be regarded as a niche interface, and its popularity rate is not high. However, with people's increasing requirements for image resolution and refresh rate, the popularity of DP interface is full of hope.

Currently, the popular hdmi2.1 standard interface has been released as early as November 2017, and it is only now being gradually introduced and used by TV manufacturers. The reason is very simple. In the field of TV use at that time, there was not much demand for 4K high refresh rate (almost none). Hdmi2.0 was enough to meet the demand for 4K use. There was no need to increase the cost to use the higher-end hdmi2.1 standard interface. Even most 1080p resolution TVs used the hdmi1.4 standard interface. Until the gradual popularization of 4K video, hdmi2.0 gradually emerged.

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