Digital display systems in the nature of LED persistence-of-vision displays creating the illusion of words and/or images being displayed in mid-air, which displays are positioned at the point-of-purchase for marketing to consumers in retail environments

'air':26 'and/or':19 'consum':40 'creat':14 'digit':1 'display':2,13,22,28 'environ':43 'illus':16 'imag':20 'led':8 'market':38 'mid':25 'mid-air':24 'natur':6 'persist':10 'persistence-of-vis':9 'point':34 'point-of-purchas':33 'posit':30 'purchas':36 'retail':42 'system':3 'vision':12 'word':18

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