Bivariate Lifetime Model for Organic Light-Emitting Diodes

Abstract

Despite advantages of organic light-emitting diode (OLED) displays over liquid crystal displays, reliabil-ity concerns persist. These concerns must be addressed before OLED displays are widely adopted. In particular, ex-isting methods are unable to reliably estimate the lifetime of large OLED displays (i. e., displays of 55 in or larger). This study proposes a novel model that incorporates physical and statistical uncertainty to estimate the lifetime of large OLED panels under normal usage conditions. A likelihood-ratio- based validationmethod is presented to determine the validity of the calculated model parameters. A bivariate ac-celeration model with two critical factors-temperature and luminance-is presented. The lifespan predicted by the pro-posed lifetime model shows a good agreement with the experimental results.