Color Tuning dispense process to minimize color variation

This paper shows a dispense process to tune the target color of white LED package. This system enables to monitor the emission color through newly developed color inspection unit and correct the dispense parameter calculated on the basis of the emission color data during the production process. By setting target chromaticity data, the system automatically tunes emitting color of phosphor material on color inspection unit and feedbacks the dispense parameter before dispensing phosphor on actual packages. The standard blue light to emit the phosphor paste in this system can tune same target color with all systems installed in mass-production. The newly developed system can make a desired color in desired quantities, and increase yield rates of white LEDs.