Production process
1) Cleaning: Clean the PCB or LED bracket with ultrasonic waves and dry them.
2) Mounting: Prepare the silver glue on the bottom electrode of the LED die (big disc) and then expand it. Place the expanded die (big disc) on the spinner table, and use a spinner pen to clean the die under a microscope. Install one by one on the corresponding pads of the PCB or LED bracket, and then sinter to cure the silver glue.
3 Pressure welding: use an aluminum wire or gold wire welder to connect the electrode to the LED die as a lead for current injection. If the LED is directly mounted on the PCB, an aluminum wire welding machine is generally used. (Gold wire welding machine is required to make white light TOP-LED)
4) Encapsulation: Protect the LED die and bonding wires with epoxy by dispensing glue. Dispensing glue on the PCB has strict requirements on the shape of the glue after curing, which is directly related to the brightness of the finished backlight. This process will also undertake the task of pointing phosphor (white LED).
5) Soldering: If the backlight source uses SMD-LED or other packaged LEDs, the LEDs need to be soldered to the PCB board before the assembly process.
6) Cutting film: Die-cut various diffusion films, reflective films, etc. required by the backlight with a punching machine.
7) Assembly: According to the requirements of the drawing, manually install various materials of the backlight in the correct position.
8) Test: Check whether the photoelectric parameters of the backlight source and the light uniformity are good.
Packing: Pack the finished products according to the requirements and put them into storage.
