Set TV in demo mode

I have a small business with electronic goods and some TV's.
Recently I visited a big shop with TV's that had their specs and prices displayed on the screen!
Like an epop message which is part of demo (retail) mode on televisions.

Does anybody know how to set it up because I can not find anything online?

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Reply to: Set TV in demo mode
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Clarification Request
Too many ways.

Samsung may have such as a feature to run a slide show from a memory stick or the TV.
Or they could have a player behind the set.

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Clarification Request
This is the exact thing I am looking for how to achieve:

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