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Attention! Don‘t ignore it when buying a monitor

Time:2020-01-04 Views:12

1VGA analog signal interface


After the gorgeous parameters of curved surface, high score, and large screen fill the market, users often ignore the importance of the display interface. In fact, the interface is also very important for the performance of the display. The interface of the liquid crystal display directly determines the quality of image transmission and affects the visual effect of user viewing. At present, the common interface types are: VGA, DVI, HDMI, USB, DP and other interfaces.

Attention! Don‘t ignore it when buying a monitor




The VGA interface is one of the most common interfaces in the past. It has been used since the era of CRT displays, but it can only accept analog signals. It stands up like a capital letter "D", which is what we often call a D-shaped port, so it is also called a D-Sub interface. It has 15 holes on it and can transmit different signals.

VGA interface can only transmit analog signals, signal conversion is easy to bring signal loss




Because the VGA interface is an analog signal transmission, it is susceptible to interference, and signal conversion easily results in signal loss. In theory, it can support the transmission of 2048x1536 resolution pictures, but there will be obvious distortion. In fact, at 1080P Full HD resolution, users can obviously feel the loss of the picture through the naked eye. Therefore, it is recommended to use a VAG interface for displays below 1080P resolution.

VGA wiring




The VGA interface still appears in many monitors, but its disadvantages are also obvious, that is, the high resolution cannot reach the refresh rate it should have, and only the image input has no sound input. It can only work on monitors under 20 inches, and it is virtually useless on large and high-end monitors, which can hardly play any role.






2DVI digital video interface is still mainstream

DVI digital video interface is a display interface that has emerged with the development of digital display devices in recent years. It can directly transmit digital signals to the display, avoiding the secondary conversion of digital signals into analog signals and then into digital signals. Greatly saves time, speeds up, and effectively eliminates afterimages and smears. In addition, using DVI for data transmission, the signal is not attenuated, and the picture color is more pure and more realistic.

DVI interface can directly transmit digital signals to the display, avoiding secondary conversion




The DVI interface is relatively complicated, mainly divided into three types, DVI-A, DVI-D and DVI-I. And DVI-D and DVI-I are divided into single-channel and dual-channel. DVI-A can only transmit analog signals, which is essentially equivalent to the VGA interface, which has been abandoned. DVI-D is a pure digital interface that can only transmit digital signals and is not compatible with analog signals. DVI-I is compatible with digital and analog interfaces .

Comparison of DVI interface types




Through the DVI interface, long-distance, high-quality digital signal transmission can be achieved with low-cost professional cables. DVI is an international open interface standard. It is widely used in PCs, DVDs, high-definition televisions, and high-definition projection devices. It is currently the most widely used monitor to rescue. In theory, the display effect of DVI interface is better VGA interface.






3HDMI digital interface, high score must

The HDMI interface is a fully digital image and sound transmission interface that can transmit uncompressed audio and video signals. It can transmit audio and video signals at the same time, because the audio and video signals use the same cable, which greatly simplifies the installation of system lines. The HDMI interface has good scalability, which can effectively solve the problem of cluttered wires in the home entertainment system.

HDMI interface is a fully digital image and sound transmission interface




Devices equipped with an HDMI interface have a "plug and play" feature, and the signal source and display device will automatically "negotiate" to select the most suitable video or audio format. In addition, various video output devices currently support HDMI interfaces, such as game consoles, TV boxes, digital audio, etc. It can be said that they are mainstream interfaces on many products and have a wide range of uses.


For the display, the HDMI interface can be said to be a "high score" interface.


For the display, the HDMI interface can be said to be a "high score" interface. It can provide 5Gbps data transmission bandwidth and can transmit the highest quality video and audio signals. For consumers who want to start high-scoring displays, the HDMI interface must be a point of concern. Also, the interface is small, saving space. The only limitation is that the HDMI interface will charge a patent fee, which will have a certain impact on the product price.

Gaming monitors are inseparable from the DP interface






In terms of performance, the DisplayPort interface can support 10.8Gb / S transmission bandwidth from the beginning of the market, and it can support high resolution and color above 4K. Its ultra-high bandwidth and resolution are fully suitable for the development of display equipment. In addition, when gamers assemble triple screens, DP is essential. Obviously, the gaming display is inseparable from the DP interface.


DP transmission line




At present, high-end displays and graphics cards are basically equipped with a DisplayPort interface. Compared with the HDMI interface, the DP interface has the advantage of being free of license fees. Therefore, its popularity can effortlessly compete with the HDMI Chamber. Some devices even have up to eight DP interfaces. Their powerful transmission capabilities are very attractive for display enthusiasts.






5Other data transmission interfaces, icing on the cake

USB is an external bus standard used to regulate the connection and communication of computers and external devices. The USB interface supports plug and play and hot plugging of devices. The USB interface can be used to connect up to 127 types of peripherals. Since its introduction, it has become one of the necessary interfaces for personal computers and a large number of smart devices. The two USB interfaces on the host are not enough. Many monitors are beginning to be equipped with a USB 3.0 interface to facilitate user data transfer. However, some monitors have the USB interface on the back, and they are just like eggs.

The USB interface needs to be designed on the side to fully play its role




In addition, some displays will be equipped with audio input interfaces and audio output interfaces, these interfaces can provide users with more convenience when using the display. However, these interfaces are not necessary for the display, but if there are, they can also be icing on the cake. Consumers can consider whether an interface is needed based on their usage habits.

Audio input and output interfaces can provide more convenience for users to use the display, but they are not required.





The interface types of the display are mainly the above. When you buy a display, you must not ignore the interface problem of the display. The larger the screen size and the higher the resolution, the more demanding the interface is. The HDMI and DP interfaces can be used on any display. The VGA interface is only suitable for displays below 20 inches. The DVI interface is currently the most popular. Display interface, below 2K can fully play a role. In addition, the more interfaces are not better, the more reasonable it is to choose according to your own needs.

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