What is COB

Chip on board (COB) technology is a method of directly mounting red, green, and blue chips onto a printed circuit board (PCB). Packaging the bare chips directly onto the PCB enables a much higher chip density while creating a flat uniform LED surface. The combination of three-color values allows the chips to achieve a higher color gamut and replicate true-to-life imagery. 

There are two types  of COB

1. Die bonding and wire boding

2. Flip-chip die bonding only

Compare to Die bonding together with wire bonding, Flip-chip has the bellow advantage:

1) Less failure rate 

2) Energy saving 

3) Better color performance.