The PN55D-4HH can mirror the content (to another display) into its display port out coming from its display port in. This creates a daisy chain like structure allowing for monitors to be set up as Video Wall mode.
These displays have a protection for “No Signal”. If the source is disconnected, the display will either show your customized banner or search for any other signal from video sources. Since blank screen is the worst case scenario for advertisement, failover is a critical feature in signage displays.