Digital signage, which now represents a sizable segment of the display market, includes the indoor LED direct-view signage business at $2 billion (growing to $4 billion by 2021); outdoor LED at $2 billion; projection at $3.5 billion; professional LCDs at $1.9 billion; and video cubes at $.45 billion. The market has evolved significantly over the past decade in terms of both technology and applications. Static displays, which replaced many nondigital roadside signs, are being replaced in turn by those offering full-motion and full-color video. Pixel pitches of 25 mm have shrunk to below 0.9 mm.
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