Display Type
Display type refers to the use of type at large sizes, perhaps 30 points or larger. Some typefaces are considered useful solely at display sizes, and hence are known as display faces. For typefaces used across a wide range of sizes, in the days of metal type, each size was cut individually, or even if pantographically scaled would often have adjustments made to the design for larger or smaller sizes, making a "display" face have distinct differences.
In metal type, if present in smaller sizes, ink traps (small indentations at the junctions of letter strokes) would be eliminated at display sizes. In smaller point sizes, these ink traps were intended to fill up when the letterpress was over-inked, providing some latitude in press operation while maintaining the intended appearance of the type design. At larger sizes, these ink traps were not necessary, so display faces did not have them. Today's digital typefaces are most often used for offset lithography, electrophotographic printing or other processes that are not subject to the ink supply variations of letterpress, so ink traps have largely disappeared from use.
When digital fonts feature a display variation, it is to accommodate other stylistic differences that may benefit type used at larger point sizes. Such differences, which were standard in metal type, are rare in digital type, outside of the very high end of type design. They can include: a lower x-height, higher contrast between thick and thin strokes, less space between letters, and slightly more condensed letter shapes.
Decades into the desktop publishing revolution, few typographers with metal foundry type experience are still working, and few digital typefaces are optimized specifically for different sizes, so the misuse of the term display typeface as a synonym for ornamental type has become widespread; properly speaking, ornamental typefaces are a subcategory of display typefaces.
Read more about this topic: Typeface
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