The full English name of DVI is Digital Visual Interface. Is a video interface standard designed to enhance the image quality of personal computer monitors through digital transmission. At present, it is widely used in LCD, digital projector and other display devices. In addition to the digital signal pins specified in the DVI standard, the DVI connector can also include traditional analog signal (VGA) pins. This design is to maintain the universality of DVI, so that different types of screens can share the same connection line. DVI connectors can be divided into three types according to their functions:

DVI-D (D=digital, only digital signal is transmitted): digital signal interface, which can only receive signals from DVI-D interface. There are only three rows, eight columns and 24 pins on the interface, and one pin in the upper right corner is empty, which is incompatible with analog signals.

DVI-A (A=analog, only analog signal is transmitted): analog signal interface, which can only connect signals of DVI-A or VGA interface.

DVI-I (I=A D=integrated, capable of transmitting digital and analog signals): including DVI-A and DVI-D interfaces, which are compatible with analog and digital signals. Compatible analog signals do not mean that the D-Sub interface of analog signals can be connected to the DVI-I interface. It can only be used through one adapter. In general, the graphics card with this interface will come with the corresponding adapter.