1, VGA interface
The VGA interface is also called D-sub, 15 pin, which is divided into three rows and is an old-fashioned interface. Now it has basically begun to be eliminated. The VGA interface can hardly be found in the new graphics card. Basically, it is used on the integrated graphics card of old computers or new computers. VGA interface transmits 640x480 SD video signal by default, but actually supports 18.
VGA interface
video graphics array
Different from the other three display interfaces, it transmits analog signals. As we all know, computer graphics cards generate digital signals, and monitors use digital signals. Therefore, the video interface using VGA is equivalent to a digital-to-analog conversion and an analog-to-digital conversion, which is easily disturbed by signals, so it is easy to appear paste and color cast under high load transmission. VGA interface is not recommended if other interfaces are optional.
2.DVI interface
The full name of DVI is digital video interface, which minimizes the transmission of differential signals based on TMDS and is also the most common and basic display interface a few years ago. First came DVI-A in VGA analog era, then DVI-I in analog and digital transmission, and the latest was DVI-D. Single channel supported the same resolution as dual channel, but the refresh rate was only half. Dual channel supports maximum 1080P 120hz and 2560x 1600/60hz.
Digital display working group
DVI line
Because DVI is a digital video interface, it is undoubtedly much better than the old VGA interface, but like VGA, it supports video and does not support audio. Because the original standard was not long-term, the bandwidth of DVI was not large and the size was not small, and the DVI interface was gradually eliminated.
3.HDMI interface
HDMI is the most mainstream high-definition interface at present, which is called "high-definition multimedia interface". It can support video and audio. If your monitor has audio, you can realize audio transmission, such as LCD TV and some monitors that support audio. It is characterized by high resolution, small interface, no compressed audio stream and rich protocols. The earliest version of 1.0 was launched in February 2002, and the bandwidth was increased from 1.3/ 1.4 to 10.2Gbps.
At present, the mainstream theory of HDMI 1.4 supports 1080P 144, 2K75, 3840x2 160/30, 4096x2 160/24hz, and the refresh rate needs to be reduced to YUV422 for further upgrade. HDMI2.0 has a bandwidth of up to 18Gbps and supports 1080P240, 2K 144, 4K60 and 5K30. The latest HDMI2. 1 is more exaggerated, supporting 2K240, 4K 144, 5K60 and 8K30hz.
HDMI interface
High Definition Multimedia Interface
4.DP interface
The abbreviation of DisplayPort is DP, which is a digital high-definition interface and compatible with the current mainstream HDMI interface. Both support one signal line to transmit video and audio signals at the same time. The bandwidth of DP interface has reached 10.8Gbps since the first generation, supporting 2560x 1600 12bit output. At present, the most popular DP 1.2 has reached 2 1.6Gbit/s, surpassing HDMI2.0 and supporting 1080P240, 2K 165, 4K75 and 5K30. DP 1.3 supports 2K240, 4K 120 and 8K30. The latest DP 1.4 has basically the same support, and the bandwidth is as high as 32.4Gbps, but DSC display compressed stream technology is added to support 4K240 and 8K60. In addition, there are HDR data packets, forward error correction, 32-way 1536KHz and other technical support.
DP interface
Differential pressure pipeline
There is also lightning (type-C) interface, which is the latest third-generation standard. The current lightning-3 interface can be regarded as the product of the original lightning-3 replacing miniDP interface with USBtype-c interface, and then cooperating with USB3. 1 standard. Through USB type-c interface, data can be transmitted in both directions at the speed of 40Gbit/s, and video, sound and data can be transmitted simultaneously. This means that there is enough bandwidth to connect various docking stations, such as high-performance discrete graphics cards.
Summary:
The ranking of these four display interfaces is DPHDMIDVIVGA, of which the best display interface is DP and the worst is VGA. VGA is an analog signal, and the other three interfaces are digital signals. VGA and DVI only support video transmission, not audio transmission, while HDMI and DP can transmit video and audio at the same time.