Computer graphics card full name display interface card (Video card, Graphics card), also known as display adapter (Video adapter), monitor configuration card referred to as graphics card, is one of the most basic components of personal computers. For graphics card interface types, mainly including VGA, dvi/HDMI, dp these four more common interfaces, of course, there are others.

   VGA interface is the most common, that is, the kind of computer monitor we usually connect to the host, VGA interface is a D-type interface, a total of 15 pins on it, divided into three rows, five per row. And VGA interface scalability is relatively strong, can be easily converted with DVI interface, VGA interface is introduced as follows.

vga interface   

Through the above introduction of the VGA interface including 15 pins, then the 15 pins are represented above the meaning of it? What is the function? As shown in the following figure.

VGA interface pins

   At present, most computers and external display devices are connected to each other through the analog VGA interface. The display image information generated digitally inside the computer is transformed into R, G, B primary color signals and line and field synchronization signals by the digital/analog converter in the graphics card, and the signals are transmitted to the display device through the cable. For analog display devices, such as analog CRT monitors, the signal is sent directly to the corresponding processing circuit to drive and control the picture tube to generate images. For LCD, DLP and other digital display devices, the display device needs to be equipped with the corresponding A/D (analog/digital) converter to convert the analog signal into a digital signal. After D/A and A/D 2 conversion, inevitably caused some loss of image details. VGA interface applied to CRT monitors is not wrong, but for connecting LCD and other display devices, the conversion process of image loss will make the display effect slightly reduced.