Digital Visual Interface: Difference between revisions

Revision as of 15:46, 19 March 2004

Revision as of 15:37, 24 March 2004

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Another shortcoming of DVI is that it lacks [[Universal Serial Bus|USB]] pass-throughs. This is somewhat odd considering that the standard was originally developed by [[Intel]], also the developers of USB. This has been addressed in the non-standard '''M1-DA''' connector used by [[InFocus]] on their projector systems.

The data format used by DVI is based on the PanelLink™ serial format devised by the semiconductor manufacturer Silicon Image Inc. This uses transition-minimized digital signalling (TMDS), which is a method of transmitting high-speed serial data whilst emitting the least possible electromagnetic interference (EMI). An advantage of TMDS over parallel formats is that the video data can be sent down a smaller number of wires, thereby reducing the price of the connectors and cables. A basic DVI-D link consists of four twisted pairs of wire (red, green, blue and clock) to transmit 24 bits per pixel, although for higher display resolutions a dual link (eightwith three extra pairs, using reserved pins in the standard connector) can be used.

Like modern analog VGA connectors, the DVI connector includes pins for the [[display data channel]], version 2 ([[DDC]]2) that allows the graphics adaptor to read the monitor's [[extended display identification data]] ([[EDID]]).