QlikView doesn't have any requirement protocols for displaying public dashboards on a static display or any other display for that matter. It is just like connecting a secondary monitor or a projector to your laptop.
The only catch is the display resolution.
Your dashboards must be designed (or resized) to fit the resolution of the display.
If it's just for displaying static dashboards, I think a widescreen display will fit best.
There are plenty of decent LED monitors available in the market.
You can probably choose Samsung, Asus or LG - depending upon the support available in your country/region.
But for a starter, you can take a look at these....
Asus VE228H 21 inch LED Monitor
LG E2211PU-BN 21 inch LED Monitor
Samsung S22B350H 21 inch LED Monitor
Hope that helps.