By PURPLELEC | 05 June 2023 | 0 Comments
The difference between RGB interface and VGA interface
There are many video interfaces, many of which have similarities, for example, the conversion between them can be realized through a conversion cable or a converter. Among them, there are many similarities between the VGA interface and the RGB interface. Understand the difference between these two interfaces The distinction between is very beneficial.
VGA interface and VGA signal
The VGA interface is also called the D-Sub interface. The VGA interface is a D-type interface with a total of 15 pins, divided into three rows, five in each row. The VGA interface is the most widely used interface type on graphics cards, and most graphics cards have this type of interface.
At present, 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 row, Field synchronization signal, the signal is transmitted to the display device through the cable.
The composition of VGA signal is divided into five types: RGBHV, which are the three primary colors of red, green and blue, and line and field synchronization signals. The VGA transmission distance is very short. In order to transmit a longer distance in actual engineering, people disassemble the VGA cable, separate the five signals of RGBHV, and transmit them with five coaxial cables. This transmission method is called RGB transmission. It is customary This signal is also called RGB signal, in fact, there is no difference between RGB and VGA in essence.
RGB interface and RGB signal
The RGB signal is essentially the VGA signal.
The composition of VGA signal is divided into five types: RGBHV, which are the three primary colors of red, green and blue, and line and field synchronization signals. The VGA transmission distance is very short. In order to transmit a longer distance in actual engineering, people disassemble the VGA cable, separate the five signals of RGBHV, and transmit them with five coaxial cables. This transmission method is called RGB transmission. It is customary This signal is also called RGB signal, in fact, there is no difference between RGB and VGA in essence.
At present, 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 row, Field synchronization signal, the signal is transmitted to the display device through the cable. For analog display devices, such as analog CRT monitors, 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, the corresponding A/D (analog/digital) converter needs to be configured in the display device to convert the analog signal into a digital signal. After D/A and A/D2 conversions, some image details are inevitably lost. There is nothing wrong with the application of VGA interface to CRT monitors, but if it is used to connect display devices such as liquid crystals, the image loss in the conversion process will slightly reduce the display effect.
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