Chip damage
LED display chip damage will directly lead to LED failure, so to improve the reliability of LED chips is essential. Vapor deposition process sometimes need to use the spring clip to fix the chip, it will have a nick. Yellow work if the development is not complete and the mask has a hole in the light emitting area will have more residual metal. Grains in the first stage of the process, the process such as cleaning, evaporation, yellow, chemical etching, fusion, grinding and other operations must use tweezers and flower baskets, carriers, etc., there will be scratched the grain electrode occurs.
Chip electrode on the impact of solder joints: the chip electrode evaporation itself is not reliable, resulting in wire after the electrode off or damage; chip electrode itself solderability will lead to solder ball Weld; chip storage improper will lead to electrode surface oxidation, surface contamination Etc., slight contamination of the bonding surfaces may affect the diffusion of metal atoms between the two, resulting in failure or Weld.
