Japan's three major convenience store chains are expanding digital signage to spur purchases and generate advertising revenue amid sluggish growth in customer numbers.FamilyMart Co. installed screens at about 12,000 stores by September after fully launching the business in 2021, a move modeled after U.S. retail giant Walmart Inc., which diversified revenue through advertising businesses including digital signage.FamilyMart generally runs 15-second ads above checkout areas, with its operator saying the screens have increased customers' interest in using advertised products and services.The a…READ FULL ARTICLE