What's MHL?

Mobile High-definition Link (MHL) HD AV standard interface, is a portable consumer electronics device to connect the audio-visual standard interface, MHL only use a signal cable, through the standard HDMI input interface can be presented on high-definition television. It uses the existing Micro USB interface, whether mobile phones, digital cameras, digital cameras and portable multimedia players, can be the full media content directly to the television and not damage the film's high resolution effect.

　Introduction to MHL Technology

The traditional HDMI has 19 pins, 12 of these pins are mainly used to transmit video and audio signals, of which 12 pins are divided into 4 channels to transmit audio and video, which we call the minimized transmission differential signal (TMDS); and 3 pins are specifically used for control purposes, These control signals include DDC (Display Data Channel) and consumer electronic controls (Consumer Electronics control, CEC). So the rest of the pins are for other uses, so the audio, video and control alone take up 15 pins, a traditional HDMI structure.

MHL is a new interface developed by Silicon image. It is different from the traditional HDMI 19 pins, MHL only 5 pins, of which 4 pins dedicated to the transmission of audio and video signals, 1 pins are specifically used for control. It is equivalent to the TMDS and DDC, CEC combined to control, is a control bus, with this control bus can be all the audio and video to carry out a full range of control, it makes the data storage and data transmission becomes easier, this is the benefits of MHL new interface.

In order to transmit RGB data, MHL the standard HDMI link three minimum transmission difference signal (TMDS) channel reduced to one, the speed is the traditional HDMI three times times, thus, can achieve on the portable device average power consumption only 60mW, the speed achieves 2.25Gbps the connection, And the network can be transmitted through 5 pins to any existing connectors on the device.

One advantage of MHL is that it can transmit signals in all kinds of formats. The biggest difference between a mobile phone and a TV is its ability to support multiple media formats, including Mpeg4,h.264,avi,quick time, or Windows Media, or even rm/rmvb. MHL in the process of transmission so that the television will not understand the compression of the link, these signals can be transmitted intact to high-definition TV and playback, support a variety of formats of the signal, the quality of any loss. The manufacturer wants a connector to perform all the functions, so that USB and MHL can be used in the same connector.

　　Main performance of MHL technology

1. With only 5 pins, HD AV signal can be provided, which allows the use of a micro-connector suitable for portable devices to achieve.

2. With ultra-low operating current and standby power consumption, can save battery life.

3. High-quality digital high-definition video with up to 1080p resolution can be supported through a single cable.

4. Compatible with the HDMI input interface used by most digital TVs today.

5. Includes integrated CEC functions and logical controls.