Two life prediction models for optoelectronic displays without conventional life tests

Area of Science:

• Materials Science
• Reliability Engineering
• Electrical Engineering

Background:

• Optoelectronic displays require precise life prediction for reliability.
• Traditional life tests are time-consuming and inefficient.
• Accelerated degradation testing (ADT) offers a potential solution.

Purpose of the Study:

• Develop and validate two novel life prediction models for optoelectronic displays.
• Improve the accuracy and efficiency of life prediction methods.
• Reduce the reliance on conventional, time-intensive life tests.

Main Methods:

• Established two models using the three-parameter Weibull right approximation method (TPWRAM).
• Model I: Fitted acceleration life data with extrapolation functions to determine optimal fit.
• Model II: Introduced an acceleration parameter to calculate luminance attenuation under conventional stress directly from ADT data.

Main Results:

• Vacuum fluorescent display (VFD) luminance attenuation data were collected via constant-stress ADT.
• Model I revealed the relationship between life and stress, simplifying prediction.
• Model II enabled obtaining luminance attenuation formulas without conventional tests, overcoming time limitations.

Conclusions:

• The developed ADT scheme and prediction models are feasible and highly precise.
• Both models accurately estimate optoelectronic product life, bypassing conventional tests.
• The study enhances life prediction methodologies and their theoretical underpinnings.