COB is Chip on board, which is a different chip encapsulation technology, all chips directly integrated packaged on the special PCB board, while what we said encapsulation tech is putting three RGB led chips to integrate inside an SMD electronics package to produce the individual SMD diodes. COB Display literally sounds similar to the GOB display technology, but it has longer developing history, and recently has been adopted in some main manufacturers’ promoted products.. Wide viewing angle, high color uniformity, high contrast, high power efficiency, etc, are the cliches features same with traditional led technology. The biggest thing is using COB LED Display to get high protection performance like collision avoidance ,moisture proof and dust proof, in short, higher environmental adaptability, this Nanoshi led coating technology to get pixel level protection.