Now many mobile phones and tablets will have Functions, such as the famous Galaxy S3, Galaxy Note II, One X, etc., feature that HD output and micro USB interface share the same interface. In some Motorola mobile phones and LG's earlier dual core mobile phones, we can see another kind of HD output interface micro HDMI. What's the difference between their use? Let's take a test to see this problem.

First, let's take a look at the differences in appearance between MHL and micro HDMI cables.

Micro HDMI is not very different from some of our common HD output cables in appearance. It is just that the common HDMI interface and mini HDMI interface are replaced by micro HDMI. Some mobile phones equipped with micro HDMI will attach this output line. The following figures are HDMI, mini HDMI, micro HDMI ▼

Some mobile phones have the MHL output function. It uses the same interface as the micro USB of the phone. The figure below shows the MHL port ▼ of Xiaomi 2

The structure of the MHL video output cable is much more complex. The HDMI interface connects two cables, one is a standard USB interface, and the other is a micro USB interface. Standard USB interface is used for power supply, while micro USB is used for video output ▼

The following figure shows the XT928 with micro HDMI. This mobile phone inherits the tradition of "Blade" Razr series, and puts micro HDMI and micro USB together ▼

Actual test

MHL

Xiaomi 2 is very powerful in terms of expansion functions. Of course, OTG, MHL, etc. are not rare. After MHL is connected, it has achieved HD output. (1920*1080/30P)▼

HTC Butterfly

Butterfly can also achieve high-definition output through MHL, but the frame number is lower, and the sliding is not as smooth as Xiaomi 2. （1920*1080/24P）▼

micro HDMI

Motorola XT928

After the micro HDMI is plugged in, there are two output options. One is to directly output the video signal of the mobile phone, which is not different from ordinary mobile phones. The content of the mobile phone screen is displayed directly. The other way is Motorola's unique WEBTop mode. After using this mode, the output display/TV will display the same interface as the Android tablet, while the mobile phone will become an analog mouse and keyboard.

Mode selection ▼

After the WEB top mode, the output displays the same interface as the Android tablet ▼

The mobile phone end becomes an analog mouse and keyboard ▼

Of course, XT928 can also directly output the content displayed on the phone ▼

Nexus 10

This is the most high-end Android tablet at this stage. It uses dual core A15 and a 10.1 inch 2560 * 1600 screen. Like many Android tablets, this tablet is also equipped with a micro HDMI interface. Judging from the number of video frames, the Nexus 10 is much higher than other machines, which is also a powerful manifestation of the Nexus 10 (1920 * 1080/60P) ▼

From the above tests, it is not a problem for mainstream mobile phones and tablets to achieve HD output, but not all mobile phones and tablets can achieve high frame output, with uneven effects. In addition, if it is used for playing games, it is not convenient to use HD output. Motorola's WEBTop is a good idea. After the micro HDMI is plugged in, the mobile phone directly becomes a touchpad and virtual keyboard, which has many advantages for the experience. If there are corresponding games that can use this feature, the mobile phone can become a virtual game "handle" after connecting to the HD output, which will have better performance in game operation.

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