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Signals Are Transmitted Via Cables To The Display Device
- Jun 22, 2018 -

A in VGA refers to "array" rather than "adapter" because it was designed from the beginning to be a single integrated chip to replace the Motorola 6845 and dozens of discrete logics. The ISA master is a combination of chips. This design was used by previous MDA, CGA, and EGA. This feature of the VGA allows it to easily integrate into the PC's motherboard, only requires additional video memory, oscillator and a RAMDAC, with display capabilities. IBM's PS/2 computer series is designed to use VGA on the motherboard.

Nowadays, most computers and external display devices are connected through an analog VGA interface. The computer internally generates digital display image information and is converted into R, G, and B primary color signals and lines by the digital/analog converters in the graphics card. Field synchronization signal, the signal is transmitted to the display device through the cable. For analog display devices, such as analog CRT displays, the signals are sent directly to the corresponding processing circuits, which drive and control the kinescopes to generate images. For LCD, DLP and other digital display devices, the corresponding A/D (Analog/Digital) converters need to be configured in the display device to convert the analog signals into digital signals. After D/A and A/D conversions, some image details are inevitably lost. It is understandable that the VGA interface is applied to a CRT display, but for connecting a display device such as a liquid crystal, the image loss during the conversion process may slightly degrade the display effect.