I have always believed that information is important so people can hopefully understand the what goes on behind the scenes in the development of certain aspects of a product. The grid in LED DMD displays is one that when it is understood, it will make sense as to why it exists and at the current state of technology, why it will continue to exist, until the technology is available to remove it. I have attached a file to this posting, it is a PDF. It helps illustrate why the grid exists.
Brett