Display type is just that!...It is meant for Headlines, Book Titles, Advertisement Headlines, Posters...you name it. Display type is meant to get your attention. It also supports or enhances the message or idea you are trying to get across by the way it looks. A Valentine's card might include a delicate cursive font... A war movie title would undoubtedly be big, bold, distressed... a western movie will have slab serifs and maybe some type of carving in it. This form of typeface might be a work of art  standing on its own!