Interface VGA DVI Introduction and Characteristics

With the progress and development of display technology, there are more and more interfaces for industrial monitors. The common interfaces of industrial monitors are: VGA, DVI, HDMI, DP, etc. The following Symtrue will introduce the knowledge of two of these interfaces (VGA, DVI), hoping that we can have a new understanding of them.

VGA interface: VGA (Video Graphics Array) and a name called D-Sub. 15-pin VGA interface, divided into three rows, each row of five holes, is a very widely used type of interface on the graphics card, the vast majority of graphics cards with this kind of interface. It transmits red, green and blue analog signals as well as synchronization signals (horizontal and vertical signals). Use VGA to connect devices, the cable length should not exceed 10 meters, and you should pay attention to whether the connector is firmly installed, otherwise it may cause a false image in the image.

• 　　VGA interface has several characteristics as follows.
• 　　Theoretically able to support 2048×1536 resolution screen transmission.
• 　　VGA is analog signal transmission, the transmission process is susceptible to signal interference, signal conversion is easy to bring signal loss.
• 　　in 1080P resolution, the user will be able to clearly feel the loss of the picture through the naked eye.

It is recommended to adopt 1080P resolution below monitor. VGA is currently widely used display interface, almost the vast majority of low-end monitors with VGA interface, but also because of its shortcomings are more obvious, high resolution can not reach the due refresh rate and only image input without sound input, so it is difficult to occupy a place in the high-end display market.

DVI interface: DVI (Digital Visual Interface) interface and VGA are commonly used in the computer interface, and VGA is different, DVI can transmit digital signals, without digital-to-analog conversion, so the picture quality is very high. At present, many HDTVs also provide a DVI interface. It should be noted that DVI interface has a variety of specifications, the common DVI-D (Digital) and DVI-I (Intergrated). DVI-D can only transmit digital signals, you can use it to connect graphics cards and flat-panel TVs. DVI-I can be converted between DVI-D and VGA.

• 　　DVI interface has the following characteristics.
• 　　Only able to transmit images, support limited resolution.
• 　　Only supports 8bit RGB signal transmission, for some broader color gamut of the display is not supported.
• 　　The interface is relatively large, inefficient, can not be applied to devices such as ultra-thin book.
• 　　Device compatibility is relatively general, especially flat-panel TVs and so on.

DVI transmission is a digital signal, digital image information without any conversion, will be directly transmitted to the display device, so reduce the digital → analog → digital cumbersome conversion process, greatly saving time, so it is faster, effectively eliminate the drag phenomenon, and the use of DVI for data transmission, the signal is not attenuated, the color is more pure, more realistic, the current application is also more widely used.