dvi summary

DVI (Digital Visual Interface) interfaces, or digital video interface. It is 1999 by Silicon Image, Intel (Intel), Compaq (Compaq), IBM, HP (Hewlett-Packard), NEC, Fujitsu (Fujitsu), and other companies formed DDWG (Digital Display Working Group, figures show that the Working Group) launched The interface standards.

DVI interface is Silicon Image's PanalLink interface technology, based on the TMDS (Transition Minimized Differential Signaling, the smallest of the differential signal transmission) electronic agreement as the basic electrical connections. TMDS differential signal is a mechanism could be of a data encoding and transmission through the serial connection. Cards from the digital signal transmitter in accordance with the agreement TMDS encoded by TMDS channel sent to the receiver, gave figures show that the decoding equipment.

A DVI display system includes a transmitter and a receiver. Transmitter is the source of signals, built-in graphics chip, the chip can also be attached to appear in the form of graphics on the PCB and the receiver is a display on the circuit, which can accept digital signals, to decode And delivered to figures show circuit, through the two, a card issued by the signal display on the image.

The current DVI interface is divided into two types:

One is the DVI-D interface, can only receive digital signals, the interface on only three of eight ranked 24-pin, of which the top right corner of a pin is empty. Not compatible with analog signals.
Another is the DVI-I interface, compatible with both analog and digital signals. Compatible with the analog signal does not mean that the analog interface D-Sub interface can be connected to the DVI-I interface, but must pass an adapter to use, general use of such cards will interface with the relevant adapter.

DVI signal, HDCP signals and HDMI signals for VGA signals, if eliminated all kinds of agreement, the signal path is essentially the same, are DVI signal. So first introduced DVI signal characteristics.

In a simulated display, will be shown in figures RG.B signal (8 bit parallel signals) in the graphics card in the D / A converted to analog signals, transmitted into the display, after the driver RG.B electron gun, to screen display , The whole process is simulated. The figures show that in different ways, the RGB analog signal equipment arrived after the show (LCD or DLP, PDP, etc.) after A / D processing, converted to digital signals, followed by the digital signal in the TFT LCD source driver in the DAC through the conversion into analog signals Transmission Control LCD panels or reflected light or DMD chip reflected light from plasma or LED, to show results. In this process there is an obvious from the figures SIMULATION digital simulation of the conversion process, the greater loss of signal (one A / D, D / A in the course of the spectrum on the loss of 6 dB, the largest bandwidth reservations for the pixel clock 1 / 2), and there will be such as tailing, fuzzy, ghosting and other transmission problems. At present the computer with a digital interface card has been quite common, and even laptop computers are equipped with DVI interface, display devices are also more and more equipment with a digital signal interface, digital → digital environment is ripe for the application.

DVI principle is to be displayed on the digital signal and RGB HV coded signal combinations, each pixel on 10 bit digital signal by the smallest non-zero encoding and a string → conversion, the code after the serial number RG.B Stream and pixel clock, and other four balanced manner in accordance with the signal transmission, each of its flow rate of road code, the original pixels 10 times the clock to 1024 × 768 × 70 resolution as an example, the code-clock to 70 MHz × 10, Equivalent to 0.7 GHZ. General DVI1.0 the stream in the 0.24 GHZ to between 1.65 GHZ.

DVI have DVI1.0 and DVI2.0 two standards, which DVI1.0 only one of a group of the signal transmission channel, transmit images of the highest pixel clock for the 165 M (1600RGB * 1200 @ 60Hz, UXGA), the highest channel Signal transmission stream to 1.65 GHz. DVI2.0 then spent all of the two signal transmission channel, transmit images of the highest pixel clock for the 330 M, each channel the maximum signal transmission stream for 1.65 GHz. In the display device, there is no DVI2.0 the application of this paper under discussion are the means DVI1.0 DVI standards.

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