Article Abstracts | April 2008
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LED Characterization for Production Quality Control
Output measurements are enhanced with an understanding of the capabilities and limitations of available metrology instrumentation.
by Dr. Hubert Kostal and Ron Rykowski, Radiant Imaging
LEDs have evolved rapidly from use as simple indicator lights to use in more complex arrays and assemblies for illumination, displays, instrument panels, projectors, backlights, and medical and scientific instrumentation. These more sophisticated applications are driving the need for increasingly stringent luminosity and chromaticity measurements. In a cell phone display, for example, the color and luminance must be uniform and must not degrade over time.
A clear difference exists between measuring LED performance in production and evaluating it in development. In particular, quality assurance and quality control during production place a priority on speed, cost and ease of use. There often is more than one way to obtain these types of measurements, and choosing the optimum solution for a particular production situation requires a clear understanding of the type of data required and of the capabilities of the instrumentation used...
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