What interface is dvi?

dvi is a digital video interface. Its full English name is Digital Visual Interface. It is a video interface standard designed to transmit uncompressed digital video; it is widely used in LCDs and digital projectors. and other display devices; this standard was formulated by the "Digital Display Working Group" of a forum composed of several leading manufacturers in the display industry; the DVI interface can send uncompressed digital video data to the display device.

#The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

What is the interface of dvi?

Digital video interface.

The full English name of DVI is Digital Visual Interface, and the Chinese name is "Digital Video Interface". It is a video interface standard designed to transmit uncompressed digital video. Widely used in display devices such as LCDs and digital projectors. This standard was developed by the Digital Display Working Group (DDWG), a forum composed of several leading manufacturers in the display industry. The DVI interface can send uncompressed digital video data to the display device. This specification is partially compatible with the HDMI standard.

#The protocol of the DVI interface causes the brightness and color signals of the pixels to be sent from the signal source (such as the graphics card) to the display device in binary form. When the display device is driven at its native resolution, it only needs to read the numerical data of each pixel from the DVI and apply it to the correct position. Compared with pixel data sent in analog mode, which will be affected by adjacent pixel data, electromagnetic noise, and other analog lossy effects, in this method, each pixel in the output register directly corresponds to each pixel on the display. This ensures basic picture quality.

Prior to this, standards for sending video data in an analog manner, such as VGA, were designed for display devices based on picture tubes (cathode ray tubes). The units sent were horizontal scanning lines, so digitization was not used. discrete signal. The video signal sent by analog is to change the output voltage to control the density of the electron beam during scanning, and thereby express the brightness and chroma.

However, when digital display devices such as LCDs begin to become practical, when signals are sent to digital display devices in analog mode, the device must sample the scan line signals at a specific frequency and then convert them back to digital format. If there is an error in sampling, the picture quality will deteriorate, but there is no obvious difference between the actual DVI picture and the D-SUB output picture quality below 19 inches. And when the signal source is a computer, the process of the graphics card converting the digital picture signal into an analog output, and then converting it back to a digital picture by the LCD monitor is obviously redundant. Therefore, DVI is also widely used as LCD monitors become mainstream.

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