Something about DVI connector and related connectors

DVI (Digital Visual Interface) was developed by the industry body DDWG (the Data Display Working Group) to send digital information from a computer to a digital display, such as a flat-panel LCD monitor.
DVI uses TMDS (transition minimized differential signaling) to transmit large amounts of digital data from the source to the display, resulting in a high-quality image. DVI technology successfully moved from the computer marketplace to the audio/video realm, and is now found on many high-end TVs, DVD players, and HDTV set-top boxes.
DVI took a step forward withHDMI, which integrates audio and video into a more compact interface. The DVI interface uses a connector that resembles a DB-style connection. However, instead of round pins, the DVI connector uses flattened pins that appear "twisted" at an angle. This design is referred to as an LFH (low force helix) connector. The peculiar shape of the pins ensures a good contact with the mating connector. DVI connectors use thumbscrews for retention.
Most DVI connectors have 24 pins and a single larger, offset ground bar. These are called DVI-D interfaces, and carry a digital signal only. Some DVI connectors, called DVI-I, have four extra pins that surround the offset ground bar. A DVI-I interface is designed to carry both digital and analog signals.

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