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What Is DVI?

What Is DVI?


DVI is September 1998, set up on the Intel Developer Forum Digital Display Working Group (Digital Display Working Group referred to the DDWG) invented a technique for high-speed digital signal transmission, there are DVI-A, DVI-D and DVI -I three interfaces of different forms. Only the digital interface DVI-D, DVI-I analog and digital interfaces, the main application of the current DVI-I (24 + 5) based.

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Background

DVI (Digital Visual Interface), namely digital video interface. It was in 1999 by Silicon Image, Intel ( Intel ), Compaq ( Compaq ), IBM, HP (Hewlett-Packard), NEC, Fujitsu (Fujitsu) and other companies together form DDWG (Digital Display Working Group, Digital Display Working Group) launched interface standard.

DVI is based on TMDS (Transition Minimized Differential Signaling), transition minimized differential signaling technology to transmit digital signals, TMDS use of advanced encoding algorithms to 8bit data (R, G, each embankment color signal B in) by minimizing transcoding to 10bit data (including horizontal and vertical sync information, clock information, data DE, error correction, etc.), after DC balance, a data differential signal transmission, and it LVDS, TTL compared better electromagnetic compatibility, cost can be dedicated cable long distance, high-quality digital signal transmission. TMDS transmission structure connected art shown in Fig. Digital Video Interface (DVI) is an international open standard interfaces in PC have a wide range of applications, DVD, high-definition television (HDTV), high-definition projectors and other equipment.


classification


DVI-A(12+5)

12 + 5 pin DVI cable, currently on the market is the most common DVI cable, equal to or less than 1920 x1200 resolution display, with such a DVI cable is. Because in this resolution, single and dual channel output quality is the same, manufacturers do not need to spend a higher cost comes with dual lines. Buy it, around $ 20 to win.


DVI-D (24 + 1/18 + 1)

DVI-D connector purely digital interface can transmit digital signals , analog signals are not compatible. Because it does not transmit analog models, and therefore can not be converted vga interface.

DVI-I (24 + 5)

24 + 5 pin DVI cable prices high, so only a high-resolution display or 3D

Display only match.

5 + 5 pin to VGA cable

This line is generally not provided in a display accessory with the VGA interface, "5 +" is representative of pin supports digital and analog signals. Why not use 24 + 5 pin, also in order to save costs.


Pin Definition

For a single connection, only the foot 1,2,9,10,17,18 transmission shown in FIG.

DVI8071.jpg

specification



Maximum resolution


Interface species

Maximum resolution

VGA

2048x1536,60Hz

DVI-I single-channel

1920x1200,60Hz

DVI-I dual channel

2560x1600,60Hz/1920x1080,120Hz

DVI-D single-channel

1920x1200,60Hz

DVI-D two-channel

2560x1600,60Hz/1920x1080,120Hz



Types of

signal type

Contacts

Remark

DVI-I single-channel

Digital / analog

18 + 5

Convertible VGA

DVI-I dual channel

Digital / analog

24 + 5

Convertible VGA

DVI-D single-channel

digital

18 + 1

Non-convertible VGA

DVI-D two-channel

digital

24 + 1

Non-convertible VGA

DVI-A

simulation

12 + 5

Obsolete








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