The information processed by the graphics card is ultimately output to the display. The output interface of the graphics card is a bridge between the computer and the display. It is responsible for outputting corresponding image signals to the display. Because of the design and manufacturing reasons, CRT monitors can only accept analog signal input, which requires the graphics card to output analog signals. The VGA interface is the interface for outputting analog signals on the graphics card, and the VGA (Video Graphics Array) interface, also called the D-Sub interface. Although liquid crystal displays can directly receive digital signals, many low-end products use VGA interfaces in order to match the VGA interface cards. The VGA interface is a D-type interface with a total of 15 pins empty, divided into three rows, five in each row.
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