Anomaly detection for chromaticity shift of high power white LED with mahalanobis distance approach

Jiajie Fan, Kam Chuen Yung, Michael Pecht

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

5 Citations (Scopus)

Abstract

High power white LED (HPWLED) with the benefits of high efficiency, small size, lower power consumption and high reliability has been commercially used as a substitute of the traditional white light sources in the application of general lighting systems, monitor backlighting and so on. Nowadays, in the LED's reliability field, many previous researches paid attentions only on the lumen depreciation failure in LED products, ignoring another common failure mode called chromaticity shift. In this paper, we used a data-driven method based on a multivariate distance measure, Mahalanobis distance (MD), to detect the chromaticity shift anomaly of HPWLED after aging test. The result shows that by dealing MD distributions with Weibull statistical model, a chromaticity anomaly alarm indicator can be established to detect anomaly of chromaticity shift before HPWLED failed.
Original languageEnglish
Title of host publication14th International Conference on Electronic Materials and Packaging, EMAP 2012
DOIs
Publication statusPublished - 1 Dec 2012
Event14th International Conference on Electronic Materials and Packaging, EMAP 2012 - Lantau Island, Hong Kong
Duration: 13 Dec 201216 Dec 2012

Conference

Conference14th International Conference on Electronic Materials and Packaging, EMAP 2012
Country/TerritoryHong Kong
CityLantau Island
Period13/12/1216/12/12

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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