According to the difference between the electrical structure and the physical shape, the HDMI interface can be divided into four types, Type A, Type B, Type C, Type D.
Each type of interface is composed of a socket for the device end and a plug at the end of the wire. It is driven by a low voltage 5V, and the impedance is 100 ohms. These three kinds of plugs can provide reliable TMDS connection, the A type is 19 pin HDMI interface standard, the highest penetration rate; B interface size slightly larger, but has 29 pins, can provide dual TMDS transmission channel, thus support higher data rate and Dual-Link DVI connection. The C interface and the A type interface have the same performance, but the size is smaller and is more suitable for the use of compact portable devices. The D type is the latest interface mode. It is mainly used on mobile phones. For example, Motorola mobile phone XT800 HTC P990, LG P990, LG P993, LG P999 and other mobile phone, using this interface is also part of the tablet computer, such as tablet computer Acer Acer A500 W500.
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