Glossary:COB
COB or Chip On Board is a method of construction in which one or more bare semiconductor chips are mounted directly on a circuit board rather than encapsulated in individual packages. It is often used in mass produced items such as calculators in which the chip is covered by a blob of black resin, and more recently to mount many LED chips on a base to form a high power lamp, or on a thin strip to make a filament type of LED lamp.