Interesting description.
UK start-up Lightvert is taking augmented reality to the skies, set to produce skyscraper-sized ads visible only to individual viewers’ eyes. Made possible by ECHO technology, ads as high as 656 feet could disrupt digital out of home and leverage huge spaces unusable by traditional advertising.
"At its heart, a patent-protected persistence of vision (PoV) display technology prints a temporary image onto the viewers’ retina. “ECHO imagery is generated using only a single vertical line of light and as such the image does not exist in reality, but only in the viewer’s eye.”
Clearly a Raster Scan & Laser
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