We have stood up at Retail events many times over last 12 months and said that one of the easiest ways to add screens to a retail store is to simply add an extra display (or two) onto the EPOS system.
DigiPoS Store Solutions [1] have done exactly that with lingerie retailer La Senza across all of its 186 UK stores.
Screens are used by staff for product availability checks, order placement and in-store advertising as well of course as showing images of the latest La Senza lingerie ranges.
No pictures yet I am afraid 🙁