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DVI: The Industry Standard
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by: Dave Saltonstall
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Word Count: 399
DVI cables are the industry standard for connecting high-resolution displays and delivering high-quality images with conserved sharpness and deeper blacks than is possible through the analog VGA cable, which is no longer used in professional environments. Another reason DVI technology is superseding the VGS interface for is the increased need for lack of noise in a signal, made by the constantly broadening display sizes and resolutions. A DVI Cable satisfies this requirement by being able to use a fully digital interface, although most Digital-Visual-Interface cables are actually DVI-I cables, which means they are able to transmit both digital and analog signals so the analog receivers which have the DVI interface can interact.
A DVI cable comes in two different formats: single and dual. The Dual Link version of the DVI interface is what has made the most difference in professional industry environments, making the WQXGA resolution of 2560 x 1600 pixels possible at a refresh rate of 60 Hz, with a bandwidth limit of 7.92 Gbit/s. Although the Single Link DVI maximum resolution is far from small, it supports up to 1920 x 1200 pixels at 60 Hz and a bandwidth limit reaching 3,96 Gbit/s, and is a quality basis for connecting displays to home computers today, as it supports the HDTV resolution.
The only physical difference between these two cables is the lack of six pin slots on the Single Link DVI connector when compared to the Dual Link one. It is argued that getting several signal sources through a single cable causes interference, and that is just not acceptable in a professional environment, hence why DVI cables are preferred by professionals to HDMI cables and similar solutions such as Component, S-Video or Composite cables. This way the user of the interface chooses the way to transmit audio according to requirements on its quality, and gets the highest possible picture quality.
Professional dvi-cables employ many technologies in their process of production to provide for consistent signal quality in all situations. Technology such as 24k gold plated contacts, special oxygen-free copper conductors, silver soldering, double screening for enhanced radio frequency interference protection and cellular insulation for low signal attenuation to enable longer cable lengths while keeping the picture quality. Any professional usage of the DVI interface should include these instead of the regular cheap ones to ensure true DVI quality of picture in all conditions.
About the Author
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