Detailed explanation of DP/HDMI/DVI display interface

Detailed explanation of DP/HDMI/DVI display interface

The difference between DP/HDMI/DVI interface

The full English name of HDMI is "High Definition Multimedia Interface", and the Chinese means High Definition Multimedia Interface. The HDMI interface can provide up to 5Gbps data transmission bandwidth, and can transmit uncompressed audio signals and high-resolution video signals. At the same time, there is no need to perform digital/analog or analog/digital conversion before signal transmission, which can ensure the highest quality video and audio signal transmission. The advantage of using HDMI is that only one HDMI cable is needed to transmit audio and video signals at the same time, unlike the current need for multiple cables to connect. At the same time, since there is no need for digital/analog or analog/digital conversion, higher audio and video transmission quality can be achieved.

DVI (Digital Video Interface), that is, digital video interface. It is based on TMDS (Transition Minimized Differential Signaling) technology to transmit digital signals. TMDS uses advanced coding algorithms to encode 8bit data (each of the primary color signals in R, G, B) into 10bit data through minimum conversion (Including line and field synchronization information, clock information, data DE, error correction, etc.), after DC balance, it uses differential signals to transmit data. Compared with LVDS and TTL, it has better electromagnetic compatibility performance and can be used with low-cost dedicated The cable realizes long-distance, high-quality digital signal transmission. Digital Video Interface (DVI) is an international open interface standard, which is widely used in PCs, DVDs, high-definition televisions (HDTV), high-definition projectors and other equipment.

The DP interface is the DisplayPort interface, which is a display interface issued by the Video Electronics Standards Association (VESA). As the successor to DVI, DisplayPort will add support for high-definition audio signal transmission while transmitting video signals, while supporting higher resolution and refresh rates. It can support single-channel, one-way, four-line connection, and the data transmission rate is 10.8Gbps, which is enough to transmit uncompressed video and related audio. It also supports 1Mbps two-way auxiliary channel for device control, and also supports 8-bit And 10-bit color.

DVI/HDMI resolution

　　 The common DVI interface is the DVI-D interface, which can only receive digital signals. The interface has only 3 rows and 8 columns with a total of 24 pins, of which one pin in the upper right corner is empty. Not compatible with analog signals. The other is the DVI-I interface, which is compatible with both analog and digital signals. Compatible with analog signals does not mean that the D-Sub interface of the analog signal can be connected to the DVI-I interface, but must be used through a conversion connector. Generally, the graphics card using this interface will have a related conversion connector. In the analog display mode, the digital RG.B signal (8bit parallel signal) to be displayed is converted into an analog signal by D/A in the graphics card, and then transmitted to the display. After processing, the RG.B electron gun is driven and displayed on the fluorescent screen. , The whole process is simulated. The digital display method is different. After the analog RGB signal reaches the display device (LCD or DLP, PDP, etc.), it is processed by A/D and converted into a digital signal, and then the digital signal is converted into an analog signal by the DAC in the TFT LCD source driver. Control liquid crystal panel to transmit or reflect light or DMD chip to reflect light or emit light from plasma to achieve the display effect.