You can have the URL to the order detail view in your order emails. This allows your customer to be faster at the entrance. They just open the page and if they have multiple tickets (group and/or family) it is easier to display the QR code for each ticket.
The link will be added to the purchase order email.
It is optimized to be used on a mobile device. Your customer can display the next QR code for the ticket by clicking on the ticket entry.