Digital picture viewer? Do you mean digital picture frame? As far as I'm aware, they don't offer very good quality in terms of resolution and colour reproduction. I have a selection of photos on a USB stick, formatted to 16:9 and plugged into my home TV. I can run it as a slide show for my guests.
But it depends what sort of "exhibition" you have in mind. For professional displays I have seen large (~60") 4K TV screens being used. If you are exhibiting your pictures in a museum or gallery, they might have such displays.