There are two types of VGA cables, a male connector, and a female connector. It is understandable that the VGA interface is used in CRT monitors, but if it is used to connect display devices such as liquid crystals, the image loss during the conversion process will slightly reduce the display effect.VGA can support image resolution up to 1080p. After D/A and A/D 2 conversions, some image details are inevitably lost. 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. 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. The display image information generated digitally inside the computer is converted by the digital/analog converter in the graphics card into R, G, B three primary color signals and line, Field sync signal, the signal is transmitted through the cable to the display device. Nowadays, most computers and external display devices are connected through an analog VGA interface. Usually, the graphics card without a VGA interface will come with such an adapter.
Some graphics cards that do not have a VGA interface but have a DVI (Digital Visual Interface) interface can also convert the DVI interface into a VGA interface through a simple adapter. The VGA interface is the most widely used interface type on graphics cards, and most graphics cards have this interface. The peak-to-peak voltage of the RS343 level standard is 1V. The color components in the VGA interface use the RS343 level standard. Among them, in addition to 2 NC (Not Connect) signals, 3 display data buses and 5 GND signals, the more important are 3 RGB color component signals and 2 scan synchronization signals HSYNC and VSYNC pins. The VGA interface is a D-type interface with a total of 15 pinholes, divided into three rows of five. Ports have one male and one female\two males\two females\classes. VGA interface is the most widely used interface type on graphics cards, and most graphics cards have this interface.
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Therefore, at present, the command centers of major projects and major institutions (such as military police and TV stations) all use VGA technology to transmit ultra-high-definition large-screen images. Although there are already high-definition digital standards such as HDMI and Displayport, VGA can support much higher resolutions than high-definition. However, ghosting with long cables can be caused by improperly terminated equipment or passive cable splitters rather than the cable itself. Ghosting occurs when an impedance mismatch (specified at 75 ohms (Ω)) causes the signal to be reflected. A good quality cable should not be affected by signal crosstalk, so a signal in one conductor can create unwanted currents or ghosting in adjacent conductors. Shorter VGA cables are less likely to introduce significant signal degradation. No standard defines the quality required for each resolution, but higher quality cables often contain coaxial wiring and insulation, making them thicker. Various VGA cables can support multiple resolutions ranging from 320×400px 70 Hz / 320x480px 60 Hz (12.6 MHz signal bandwidth) to 1280×1024px (SXGA) 85 Hz (160 MHz) and up to 2048×1536px ( QXGA) 85 Hz (388 MHz).
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