Building blocks enable displays to be created like curtains, as shown here in the stage design used in the band U2’s Vertigo tour. A transparent effect and multiple-angle viewing ability were achieved.

Full-color LED displays evolved out of a need for much brighter and more rugged displays than were possible using other technologies. First introduced in the mid-1990s, they now are a mainstream product for large events as well as for large, fixed installations. LEDs now have efficiencies that exceed those of low-voltage halogen lamps and are becoming more common in display backlighting applications...

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