B1
If something is on display, it is there for people to look at.
Dictionary examples:
The teacher put my terrible math test on display as a joke! (0.0)
The bakery put a giant cake on display, but it was made of plastic! (0.0)
The zoo put a banana-eating contest on display, but the monkeys won every time! (0.0)
Many old airplanes are on display at the museum. (19.1)