YDIT professional analysis of the most obvious difference between VGA signal and RGB signal

Source:YDIT 誉德 Release time:2019/9/13 9:42:44 Views:1297

 

VGA signal (paperless conference system, ultra-thin one lift)
1. The information processed by the graphics card is finally output to the display. The output interface of the graphics card is the bridge between the computer and the display, which is responsible for outputting corresponding image signals to the display.
2. Although the LCD monitor can directly receive digital signals, many low-end products use a VGA interface in order to match the VGA interface graphics card.
3, VGA interface is a D-type interface, a total of 15 pins on the top, divided into three rows, five per row.
4, VGA interface is the most widely used interface type on the graphics card, most of the graphics cards have such interfaces.
VGA and RGB interface

5, DVI (Digital Visual Interface) interface and VGA are the most commonly used interfaces in the computer. Unlike VGA, DVI can transmit digital signals without having to go through digital-to-analog conversion, so the picture quality is very high.
6. In addition, DVI-I can be converted to and from VGA in DVI-D. Tianchuang Hengda's latest pure digital HD DVI capture card, TC1000-E VGA capture card is PCIe x1 interface VGA capture card / DVI capture card.
7, CRT display because of design and manufacturing reasons, can only accept analog signal input, which requires the graphics card can input analog signals. (Paperless conference system, ultra-thin one lift)
8, VGA interface is the interface to output analog signals on the graphics card, VGA (Video Graphics Array) interface, also known as D-Sub interface.
9. Looking at the current display market, the computer and the external display device are connected by VGA interface, so the VGA interface is used on the display, but it is used to connect the display device such as liquid crystal, the image of the conversion process. Loss will still slightly reduce the effect.
10. For analog display devices, such as analog CRT displays, the signals are sent directly to the corresponding processing circuit, which drives the control picture tube to generate an image.
11. For digital display devices such as LCD and DLP, a corresponding A/D (analog/digital) converter is required in the display device to convert the analog signal into a digital signal.
12. After the D/A and A/D2 conversions, some image details are inevitably lost.

RGB signal
1. RGB: RGB is the most common solution when recording and displaying color images.
2, RGB color mode (also translated as "red, green and blue", relatively less) is a color standard in the industry, through the red ®, green (G), blue (B) three color channels Changes and their superposition to each other to get a variety of colors, RGB is the color of the three channels of red, green and blue, the method of encoding a color is collectively referred to as "color space" or "color" area".
3, RGB (red, green, blue) is just one of many color spaces. With this encoding method, each color can be represented by three variables - the intensity of red, green, and blue. However, it lacks good compatibility with early black and white display systems.
4. Convert RGB to YUV color to maintain compatibility, then switch back to RGB format as needed to display color graphics on the computer monitor.
5. The composition of the VGA signal is divided into five types: RGBHV, which are the red, green and blue primary colors and the line sync signal.
6, VGA transmission distance is very short, in order to transmit longer distances in the actual project, people take apart the VGA line, separate the five kinds of RGBHV signals, and use five coaxial cables to transmit. This transmission method is called RGB transmission. It is customary for this signal to be called an RGB signal.
In other words, essentially there is no difference between RGB and VGA (paperless conference system, ultra-thin one lifter).