LED is a semiconductor device is sensitive to static electricity , especially for white, green, blue , purple LED prevent static electricity to do the work and eliminate static electricity .
1 . Generation of static electricity :
① Friction: In daily life , any two objects of different materials in contact and then separated , to generate static electricity , the most common method of generating static electricity , that is triboelectrification . The better the insulating material , the easier triboelectrification . In addition , any two objects of different substances in contact after separation , but also to generate static electricity.
② Sensor: For the conductive material, because electrons can flow freely on its surface , as will be placed in an electric field , due to the repulsion opposites attract positive and negative ions will be transferred , will produce a surface charge .
③ Conduction : for a conductive material , the electron energy due to its surface in a free-flowing , as the charged object in contact with the charge transfer occurs .
2 . LED static electricity hazards :
① Moment due to the heat generated by the electric field or current , the LED local injury , showed a rapid increase in leakage current , still work , but the decrease in brightness , damaged life.
② Damage due to the electric field or current LED insulating layer, so that the device does not work ( completely destroyed ) , the performance of dead lights .
3 ESD protection and elimination measures:
For the whole process ( production, testing, packaging, etc. ) all direct contact with the LED employee must do to prevent and eliminate static measures , mainly
1 , anti-static floor workshop and well grounded .
2 , the table is anti-static workbench , production machines grounded.
3 , the operator wear anti-static clothing, anti-static wrist strap belt , gloves or foot ring .
4 , the application of ion fan .
5 , good grounding electric iron welding .
6 , anti-static packaging materials .