Having recently just visited London and then reading this article (website address found at the bottom) I had to agree with what was said. When going up and down the escalators to the underground, the digital adverts were a lot more powerful and eye catching than that of the usual posters I see. Having a digital output, the adverts did create a lasting memory and a feeling of enjoyment was had when viewing advertisements in this format. Whether it was due to the brightness, the innovation of being different or perhaps a mixture between the two. However if all posters turned digital, maybe the engaging effect with consumers might not be had, and the more contemporary paper posters might be enjoyed more. Nevertheless, brands currently using digital escalator posters to advertise their product or service are captivating consumers much more than that of the original paper posters.
http://www.cbsoutdoor.co.uk/web/Current-news/Newspage-UK/Digital-Posters-really-do-captivate-London-Underground-travellers.htm





