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Due to its inability to match digital signals, traditional VGA interface has gradually disappeared. And in recent years, LCD monitors with DVI interfaces have become very popular, and display cards with the DVI interfaces are also common.
When it comes to the DVI connectors, many of us will think of a white D-type socket. But unlike the VGA connectors, the DVI connectors can be divided into 3 categories and 5 standards. Each standard has its own application range. If it is not distinguished, it will affect the performance of the display device.
Detailed definition of I DVI connectors
DVI means Digital Visual Interface, which was written by Silicon Image and Intel in 1999. Companies such as Compaq, IBM, HP, NEC, and Fujitsu have formed the interface standard introduced by the DDWG (Digital Display Working Group). It is based on Silicon Image's PanalLink interface technology and TMDS (Transition)
Minimized Differential Signaling, which minimizes the transmission of differential signals) as a basic electrical connection.
DVI Connector Definition
A DVI display system consists of a transmitter and a receiver. The transmitter is the source of the signal and can be built into the graphics chip or on the graphics card PCB as an add-on chip. And the receiver is a circuit on the display. It can accept digital signals, decodes them, and passes them to digital display circuits, through which the signals from the graphics card become images on the display.
Compared to traditional VGA signals, liquid crystal displays with DVI connectors have no phase problems and do not cause pixel jitter. In addition, with the DVI connector, the display will not cause geometric distortion, which greatly improves the quality of the picture.
Different standards for DVI Connector
Unlike the VGA connector, there are many standards for the DVI connector, so when using the monitor, you should be sure to know which standard you need.
As you can see from the chart above, DVI connector is divided into 5 standards, where DVI-D and DVI-I are divided into "dual channel" and "single channel" two types. We usually see a single channel version, the dual channel version is very expensive. So the dual channel version is only used in professional equipments. Also it is difficult for common consumers to see.
Various features of the DVI signal
DVI-A is an analog transmission standard that can be seen in late-stage large-screen professional CRTs. However, with low performance, there is no essential difference from VGA. So DVI-A has actually been abandoned. As for the DFP interface, this is an early digital specification that has been deprecated.
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From : https://www.elecbee.com/en/smartblog/27_DVI-Connector-Guide.html