Since the Description field is a more open field, accepting larger Strings, combined with the fact that the documentation does not mention anything about it, and considering the user interface impact of inserting this field into the Display, given all this evidence, I believe it is not possible to do what you want.
What I have done in some cases for clients who wanted the Department to be visible to the person on the screen was to use the first name as the username and change the last name from "Last Name" to the position the person holds. This way, we were able to utilize this field on the screen.