What is VGA interface?

VGA(VideoGr hicArray) is a kind of video graphic array, which has the advantages of high resolution, fast display speed and rich colors. VGA interface is not only the standard interface of CRT display equipment, but also the standard interface of LcD display equipment, which has a wide range of applications.

With the development of electronic industry and video image processing technology, VGA (video graphics array), as a standard display interface, has been widely used in video and computer fields.

In image processing, if the traditional data transmission method is used to display high-resolution images on the display in real time, the crystal oscillation frequency is generally required to be above 40MHz, which is difficult for traditional electronic circuits to achieve. If a special image processing chip is used, its design difficulty and high development cost become the bottleneck choice.

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Features of VGA interface:

There are 15 pinholes on the VGA interface, which are divided into three rows with five in each row. Among them, besides two NC(Not Connect) signals, three display data buses and five GND signals, three RGB color component signals and two scanning synchronization signals HSYNC and VSYNC pins are more important.

The color component in VGA interface adopts RS343 level standard. The peak voltage of RS343 level standard is1v. VGA interface is the most widely used interface type on graphics cards, and most graphics cards have this interface.

Some graphics cards with DVI(Digital Visual Interface) interface without VGA interface can also convert DVI interface into VGA interface through a simple adapter. Usually, graphics cards without VGA interface will be equipped with this adapter.

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