Display a Picture on a Monitor/Panel from a server

HI,
I am looking for some help on how to display a image from database/Server to a monitors in diferent rooms.(I guess you got my point).
My questions are:
What can I use as a monitor? ThinClient/Usb Monitor/TV. If yes how we can connect.We need wireless.
How can we talk to the display panels from Server?
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All I need is to display a picture of people entering a room on the display screen from the database.

Any suggestions?