The MHL (Mobile High-Definition Link) standard was born in 2010. Its goal is to provide power and digital video output for mobile devices such as mobile phones without the need for additional complex interfaces such as HDMI. It is jointly developed by members of the MLH Alliance and Silicon Image. It requires only five pins (like mini/micro USB2.0) to provide power and video output, as well as a compatible HDMI TV, without the need for new interfaces and The data line directly uses the same TMDS technology as HDMI.
In the past few years, MHL has achieved some success, but the scale is still too small, and the application field is limited. Today, the new "superMHL" was born, this is not a pure evolutionary version.
The first is the improvement of the protocol itself, the bandwidth is doubled, and the single channel can support 4K 60FPS video output (MHL 3 supports up to 4K 30FPS), comparable to HDMI 2.0, and also supports 10/12/16--bit color depth and more color space. And no special data lines are needed. This is quite significant when H.265 is about to become popular.
If you use six channels, you can output 8K 120FPS! That is 8680×4320 that 8K TV is impacting, and also supports 36-bit color depth and 4:2:0 format.
But all this is costly, and that is to finally introduce its own superMHL interface and data line.
The receiver has 32 pins and is plugged into the same space as the 19-pin HDMI Type-A, making it the most compact video interface ever. The data line is passive and can be up to 2-3 meters in length.
The application of superMHL interface and data line is very flexible. It can be both its own superMHL on both ends, and it can also get signals from micro USB and USB Type-C and output like HDMI Type-A.
However, the number of channels that can be supported is different. Only the two ends are superMHL to reach the complete six channels. The USB Type-C can support two or four channels. The micro USB can only be single channel, which is suitable for different grades. application.
Finally, charging and multi-screen display are also stronger. MHL 2/3 can only do 4.5/10W, superMHL can support 40W (20V/2A), can charge the tablet, and can support up to eight screens.
At least in the short term, superMHL will be the patent for high-end TV, and Samsung has announced that it will launch an 8K TV with superMHL interface.
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