low angel of a large blank digital led billboard mockup in front of department store against blue sky

advertising window facade signage brand banner design lighting presentation wall glass blue line sign architecture low angel large blank digital led billboard mockup front department store sky blank empty mockup sign signboard board signpost lightbox screen billboard frame square store shop retail outdoor place equipment light white wallpaper background design style art creative generative ai object banner advertisement display announcement business media marketing street sky building floor monitor technology digital led