The entire advertisement board is inside a rectangular box with an illuminated glass from inside;
On the front of the box you can see a piece of paper of a particular size;
A two roll mechanism (one at the bottom and one at the top) make the paper scroll after a certain amount of time, or when a new advertisement arrives;
The paper roll passes a printer mechanism which prints directly on the paper.
The construction may look like in the following image:The advantages (over a similar construction with LCD or electronic paper) are:
- lower startup cost;
- the cost is moved in time when printing new signs;
- the panel can be connected via internet to a provider that periodically change advertisement;
- a smaller panel may also be used in a home to display latest news or emails.
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