How to use the vga cable?

 VGA connector is the output of the analog signal on the graphics interface, VGA (Video Graphics Array) port, also called D-Sub connector. Although the LCD monitor can receive digital signals directly, but many low-end products in order to match with vga extension cable  which uses the VGA connector. VGA interface is a D-type interface, there are above 15-pin space, divided into three rows, each row of five.vga cable interface is the most widely used type of
 Most computer with an external display is through analog VGA interface display image information, the computer digitally generated internally between devices is changing the video card in a digital / analog converter for the R, G, B three primary signals and lines, field sync signal, the signal is transmitted to the display device via a cable. For analog display device, such as an analog CRT display, the signal is sent directly to the appropriate processing circuitry, the drive control tube to generate an image. As for LCD, dvi cable and other digital  display devices, display devices need to configure the A / D (analog? Digital) converter, the analog signal into a digital signal. After a D / A conversion and A/D2, inevitably result in some loss of image detail. VGA interface used in CRT monitors is understandable, but the loss of connection for image display devices like LCD, the conversion process will display a slight decline.interface, the vast majority of graphics cards with such an interface.