Pixel pitch describes how far apart pixels are from each other. The term "DPI" (dots per inch) is a similar measure of this. Pixel pitch is important because if people can distinguish pixels to a high level they lose the overall impression of the imagery being shown.
The best analogy for this is that of a graphical mosaic - if you stand right up to such a mosaic it will just look like colorful tiles. As you walk back, it will then start to look like a "blocky" image. Walk back further still and eventually it may look like a perfect image. Video is exactly the same as it is also made of lots of small coloured tiles(pixels).
With video screens such as plasma screens, pixel pitch is not a consideration as you can stand 3' away from such a screen and it will look fine. LED Screens and projection systems can be a different story.
In all cases we will consider pixel pitch when we design your video solution. An important factor of this is the closest viewing distance for the audience. I hope that this has given you a good overview of some of the challenges and limitations to consider with video systems. I welcome any questions on this subject, or suggestions for any other future articles.
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