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DVI interface Introduction and Specifications

Time: 2012-12-10 09:54:36    Source: Original

DVI (Digital Video Interface), digital video interface. It is launched 1999 by Silicon Image, Intel (Intel), Compaq (Compaq), IBM, HP (Hewlett-Packard), NEC, Fujitsu (Fujitsu), composed DDWG (Digital Display Working Group, Digital Display Working Group) interface standard.
DVI is based on the TMDS (Transition Minimized Differential Signaling), conversion minimum differential signal) technology to transmit digital signals, TMDS the use of advanced encoding algorithms to 8bit data (R, G, B in each roadbed color signal) by minimizing conversion encoding is 10bit data (including horizontal and vertical synchronization, clock information DE data, error correction, etc.), after DC balanced, differential signal transmission data, and LVDS, TTL better electromagnetic compatibility, you can use low-cost dedicated cable to achieve long-distance, high-quality digital signal transmission TMDS art connector transport structures shown in Figure 1. Digital Video Interface (DVI) is an international open interface standards, there is a wide range of applications on the PC, DVD, high-definition television (HDTV), high-definition projectors and other equipment.

DVI interface specifications of the three types, terminal interface dimensions of 39.5mm × 15.13mm.
3 categories including: DVI-Analog (DVI-A) interface, DVI-Digital (DVI-D) interface, DVI-Integrated (DVI-I) interface.
5 sizes including DVI-A (12 +5), single-link DVI-D (18 +1), dual-link DVI-D (24 +1), single-link DVI-I (18 +5), dual-link DVI- I (24 +5).
DVI-Analog (DVI-A) interface (12 +5) only transmit analog signals, the essence of the VGA analog transmission interface specifications. When you want to analog signal D-Sub connector in the graphics card's DVI-I socket, you must use the adapter. Adapter plug, connect the graphics card is DVI-A interface. This plug will also be able to see the big screen early professional CRT.
DVI-Digital (DVI-D) interface (18 +1 and 24 +1) is a pure digital interface, can only transmit digital signals, analog signals are not compatible. DVI-D socket 18 or 24 the digital pin jack + a flat jack.
DVI-Integrated (DVI-I) connector (18 +5 24 +5) is compatible with digital and analog interfaces, so there are 18 or 24 digital DVI-I socket pin jack +5 analog pin jack (that is, the next four pinhole and a crosswise). The four lines are used for more than DVI-D compatible the traditional VGA analog signal. Based on this structure, DVI-I socket to plug a DVI-I and DVI-D plug to DVI-D DVI-D plug socket can only be inserted. Interface D-Sub connector DVI-I compatible analog interface does not mean that the analog signal can be directly connected to the DVI-I socket, it must be connected through an adapter to use. The graphics will generally use this interface with the adapter. Take into account the compatibility issues, the graphics generally will use a DVI-I interface to such ordinary VGA interface can be connected to the adapter. With two DVI interface, DVI-D monitor general use type. Monitor with a DVI interface and a VGA port, DVI interface generally use a DVI-I interface with analog signals.

Maximum resolution
Maximum resolution of interface types
VGA 2048x1536, 60Hz
DVI-I Single Channel 1920x1200, 60Hz
DVI-I dual-channel 2560x1600, 60Hz/1920x1200, 120Hz
DVI-D single-channel 1920x1200, 60Hz
DVI-D dual channel 2560x1600, 60Hz/1920x1080, 120Hz
DVI, again in the transmission of digital signals into a single connection (Single Link) and dual-link (Dual Link) in two ways. Single link DVI interface transfer rate of only dual-link half 165MHz / s, the maximum resolution and refresh rate can only support 1920x1200 60hz. As for the dual-link DVI interface, support to 2560x1600, 60Hz mode can support 1920x1080, 120Hz mode. LCD monitor to achieve the 3D effect must have a 120Hz refresh rate, 3D programs, using a DVI, must use dual link DVI cable DVI interface. In general, if the resolution 1920x1200, odd and even connected both the output quality is the same.

Type of signal type pin number Remarks
DVI-I Single-channel digital / analog 18 +5 convert VGA
DVI-I dual-channel digital / analog 24 +5 convert VGA
Single-channel digital DVI-D 18 +1 non-conversion VGA
Dual-channel digital DVI-D 24 +1 non-conversion VGA
DVI-A Analog 12 +5 been abandoned
DVI-I supports digital / analog converter interface type that will match, if the display is only a DVI interface, supports digital / analog DVI-I of the two modes. If the monitor has DVI and VGA both interfaces, with a DVI-D.