Traceable and accurate color measurement at micro LED wafers.

Micro LEDs are making their way into many applications in high-quality displays. Testing at an early stage helps manufacturers ensure best performance in color and luminance homogeneity right from the start of production. Instrument Systems has developed a high-end test camera dedicated to highest photometric and colorimetric test accuracy even for the smallest µLEDs. The camera is referenced to a high-accuracy spectrometer of the CAS 140D series, which guarantees traceability to international standards. Special calibration algorithms have been developed to take spectral variations of the individual emitters into account and ensure accurate, reproducible results. In combination with an optical excitation system, complete Micro LED wafers can be analyzed in color and luminance within minutes. In this presentation, we will share first results that demonstrate how this approach helps manufacturers achieve reliable quality and efficiency in Micro LED production.