The VGA data cable is a special cable used to connect the VGA interface (D-SUB) of the TV or monitor and the VGA interface (D-SUB) of the graphics card.
Most computers and external display devices are connected through an analog VGA interface. The display image information generated digitally inside the computer is converted into R, G, B three primary color signals and line and field signals by the digital/analog converter in the graphics card. Synchronization signal, the signal is transmitted to the display device through the data line.
For analog display devices, such as analog CRT displays, the signal is directly sent to the corresponding processing circuit to drive and control the picture tube to generate images. For digital display devices such as LCD and DLP, corresponding A/D (analog/digital) converters need to be configured in the display device to convert analog signals into digital signals.
After D/A and A/D 2 conversions, some image details are inevitably lost. It is better to use a DVI or HDMI type data cable to connect the digital display device.
VGA application
VGA (Video Graphics Array) is a computer display standard proposed by IBM in 1987 that uses analog signals. VGA first refers to the display mode of the display 640X480. The full English name of VGA is Video Graphic Array, also called Video Graphics Array.
The A in VGA refers to "array" not "adapter" because it was designed from the start as a single integrated chip to replace the Motorola 6845 and dozens of discrete logic The ISA master of the chip combination, this design is used by the previous MDA, CGA and EGA.
This feature of VGA allows it to be easily colonized into a PC motherboard, requiring only additional video memory, an oscillator and a RAMDAC to have a display function. IBM's PS/2 computer series is designed to place the VGA on the motherboard.
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