DVI Video Interface Graphics and text resolution _ Hardware Maintenance

DVI is all called Digital Visual Interface, which was 1999 by Silicon Image, Intel (Intel), Compaq (Compaq), IBM, HP (HP), NEC, Fujitsu (Fujitsu) and other companies to form DDWG (Digital display Working Group, Digital display team) introduced the interface standards. It is based on the Panallink interface technology of silicon Image company, and the Electronic Protocol of TMDS (Transition minimized differential signaling, minimized transmission difference signal) as basic electrical connection. TMDS is a differential signaling mechanism that encodes pixel data and transmits it through a serial connection. The digital signal generated by the video card is encoded by the transmitter in accordance with the TMDS protocol and sent to the receiver via the TMDS channel, which is decoded to the digital display device. A DVI display system consists of a transmitter and a receiver. The transmitter is the source of the signal, can be built inside the graphics chip, can also be in the form of additional chips in the graphics card PCB, and the receiver is a monitor on the circuit, it can accept digital signals, decoding and transmission to the digital display circuit, through both, the video card issued by the signal to become the image on the monitor.

The current DVI interface is divided into two, one is the Dvi-d interface, can only receive digital signals, the interface only 3 rows 8 columns A total of 24 pins, of which the upper right corner of a pin is empty. Incompatible analog signal.

The other is the Dvi-i interface, which is compatible with both analog and digital signals. The compatibility simulation Fortunately does not mean that analog signal interface D-sub interface can be connected to the Dvi-i interface, but must be through a conversion connector to use, the general use of this interface graphics card will have the relevant conversion connectors.

With compatibility issues in mind, the current graphics card typically uses the Dvd-i interface, which allows you to connect to the normal VGA interface via a switch connector. Monitors with DVI interfaces generally use the Dvi-d interface, as such displays typically have a VGA interface and therefore do not require a dvi-i interface with analog signals. There are, of course, a few exceptions, and some monitors have only dvi-i interfaces and no VGA connectors. Display device using DVI interface has the following two major advantages:
One, fast
The DVI transmission is a digital signal, digital image information without any conversion, will be directly transferred to the display device, so reduce the number → simulation → digital cumbersome conversion process, greatly saving time, so it faster, effectively eliminate drag-and-drop phenomenon, and the use of DVI data transmission, the signal does not decay, More pure color, more lifelike.

Second, clear picture
The internal transmission of the computer is a binary digital signal, using the VGA interface to connect the LCD, the signal needs to be transmitted through the D/a (digital/analog) converter in the video card to R, G, b three primary color signal and line, field synchronization signal, these signals through analog signal line transmission to the interior of the liquid crystal also need a corresponding A/ The D (analog/digital) converter converts the analog signal to a digital signal again to display the image on the LCD. In the above d/A, A/d conversion and signal transmission process will inevitably occur signal loss and interference, resulting in distorted image or even display errors, and DVI interface does not need to carry out these transformations, to avoid the loss of signal, so that the sharpness of the image and details of the performance have been greatly improved.