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Setting up video walls: Daisy-Chain method

Last Updated: Jun 25, 2015 04:36PM CDT
You have all seen it, on ESPN or CNN news or at the airport. The screens behind the announcer that have no bezels? Those are actually called video wall displays and these usually come in a matrix array of 4 by 4 or 3 by 3 or 2 by 2 or any configuration that you desire.

But the problem now is that there will not be enough video outputs on any video card or motherboard to properly drive these displays and that is where daisy chaining comes in. The term Daisy chain comes from folks stringing up daisies together for bracelets or wreaths and is a good analogy to apply in our situation. Daisy chaining multiple displays is actually quite easy, IF all of the displays in an array have video inputs as well as video outputs. The only two things you have to keep in mind is the order in which you want the displays to show your image and to use the same video connector for input and output on all displays. 

For Example, let's say you are working with a 2 by 2 array of panels and you want to hook them up together to your dedicated PC. the panels have VGA in and out, DVI in and out, HDMI in and out and Display Port in and out. your PC has DVI and HDMI outputs on it. So, to get you going, you will need EITHER 4 DVI or 4 HDMI cables. the first one will go from the DVI out on your Video card or motherboard to the first panel in the array to the DVI in (lower left). the 2nd DVI cable will go from the DVI out on the 1st panel to the DVI in on the 2nd panel (top left). the 3rd DVI cable will go from DVI out on 2nd panel to DVI in  on the 3rd panel (top right). Finally the 4th cable will go from the DVI out on the 3rd panel to DVI in on the 4th panel (lower right) and you are all done. this same thing could have been performed with HDMI but you cannot mix and match inputs and outputs in a daisy chained system. For example, if you go into the DVI in and plug an HDMI cable to HDMI out, you will not get a picture.

one thing to add is that daisy chaining is not only applicable to video signals; you may daisy chain power links to every panel if the panel has AC in and out plugs; you can set up RS 232 control on these via daisy chain; and finally LAN display or control and monitoring can be set up via daisy chaining as well, following the above steps.

This process is fairly simple once you have done it a few times. If you have any questions or concerns, please call us at 1-866-600-2367.
 
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